# Class yii\helpers\BaseHtml

Inheritance | yii\helpers\BaseHtml
Subclasses | yii\bootstrap\BaseHtml, yii\bootstrap\Html, yii\helpers\Html
Available since version | 2.0
Source Code | https://github.com/yiisoft/yii2/blob/master/framework/helpers/BaseHtml.php

BaseHtml provides concrete implementation for yii\helpers\Html.

Do not use BaseHtml. Use yii\helpers\Html instead.

## Public Properties

Hide inherited properties

Property | Type | Description | Defined By
--- | --- | --- | ---
$attributeOrder | array | The preferred order of attributes in a tag. | yii\helpers\BaseHtml
$attributeRegex | string | Regular expression used for attribute name validation. | yii\helpers\BaseHtml
$dataAttributes | array | List of tag attributes that should be specially handled when their values are of array type. | yii\helpers\BaseHtml
$voidElements | array | List of void elements (element name => 1) | yii\helpers\BaseHtml

## Public Methods

Hide inherited methods

Method | Description | Defined By
--- | --- | ---
a() | Generates a hyperlink tag. | yii\helpers\BaseHtml
activeCheckbox() | Generates a checkbox tag together with a label for the given model attribute. | yii\helpers\BaseHtml
activeCheckboxList() | Generates a list of checkboxes. | yii\helpers\BaseHtml
activeDropDownList() | Generates a drop-down list for the given model attribute. | yii\helpers\BaseHtml
activeFileInput() | Generates a file input tag for the given model attribute. | yii\helpers\BaseHtml
activeHiddenInput() | Generates a hidden input tag for the given model attribute. | yii\helpers\BaseHtml
activeHint() | Generates a hint tag for the given model attribute. | yii\helpers\BaseHtml
activeInput() | Generates an input tag for the given model attribute. | yii\helpers\BaseHtml
activeLabel() | Generates a label tag for the given model attribute. | yii\helpers\BaseHtml
activeListBox() | Generates a list box. | yii\helpers\BaseHtml
activePasswordInput() | Generates a password input tag for the given model attribute. | yii\helpers\BaseHtml
activeRadio() | Generates a radio button tag together with a label for the given model attribute. | yii\helpers\BaseHtml
activeRadioList() | Generates a list of radio buttons. | yii\helpers\BaseHtml
activeTextInput() | Generates a text input tag for the given model attribute. | yii\helpers\BaseHtml
activeTextarea() | Generates a textarea tag for the given model attribute. | yii\helpers\BaseHtml
addCssClass() | Adds a CSS class (or several classes) to the specified options. | yii\helpers\BaseHtml
addCssStyle() | Adds the specified CSS style to the HTML options. | yii\helpers\BaseHtml
beginForm() | Generates a form start tag. | yii\helpers\BaseHtml
beginTag() | Generates a start tag. | yii\helpers\BaseHtml
button() | Generates a button tag. | yii\helpers\BaseHtml
buttonInput() | Generates an input button. | yii\helpers\BaseHtml
checkbox() | Generates a checkbox input. | yii\helpers\BaseHtml
checkboxList() | Generates a list of checkboxes. | yii\helpers\BaseHtml
csrfMetaTags() | Generates the meta tags containing CSRF token information. | yii\helpers\BaseHtml
cssFile() | Generates a link tag that refers to an external CSS file. | yii\helpers\BaseHtml
cssStyleFromArray() | Converts a CSS style array into a string representation. | yii\helpers\BaseHtml
cssStyleToArray() | Converts a CSS style string into an array representation. | yii\helpers\BaseHtml
decode() | Decodes special HTML entities back to the corresponding characters. | yii\helpers\BaseHtml
dropDownList() | Generates a drop-down list. | yii\helpers\BaseHtml
encode() | Encodes special characters into HTML entities. | yii\helpers\BaseHtml
endForm() | Generates a form end tag. | yii\helpers\BaseHtml
endTag() | Generates an end tag. | yii\helpers\BaseHtml
error() | Generates a tag that contains the first validation error of the specified model attribute. | yii\helpers\BaseHtml
errorSummary() | Generates a summary of the validation errors. | yii\helpers\BaseHtml
escapeJsRegularExpression() | Escapes regular expression to use in JavaScript. | yii\helpers\BaseHtml
fileInput() | Generates a file input field. | yii\helpers\BaseHtml
getAttributeName() | Returns the real attribute name from the given attribute expression. | yii\helpers\BaseHtml
getAttributeValue() | Returns the value of the specified attribute name or expression. | yii\helpers\BaseHtml
getInputId() | Generates an appropriate input ID for the specified attribute name or expression. | yii\helpers\BaseHtml
getInputName() | Generates an appropriate input name for the specified attribute name or expression. | yii\helpers\BaseHtml
hiddenInput() | Generates a hidden input field. | yii\helpers\BaseHtml
img() | Generates an image tag. | yii\helpers\BaseHtml
input() | Generates an input type of the given type. | yii\helpers\BaseHtml
jsFile() | Generates a script tag that refers to an external JavaScript file. | yii\helpers\BaseHtml
label() | Generates a label tag. | yii\helpers\BaseHtml
listBox() | Generates a list box. | yii\helpers\BaseHtml
mailto() | Generates a mailto hyperlink. | yii\helpers\BaseHtml
ol() | Generates an ordered list. | yii\helpers\BaseHtml
passwordInput() | Generates a password input field. | yii\helpers\BaseHtml
radio() | Generates a radio button input. | yii\helpers\BaseHtml
radioList() | Generates a list of radio buttons. | yii\helpers\BaseHtml
removeCssClass() | Removes a CSS class from the specified options. | yii\helpers\BaseHtml
removeCssStyle() | Removes the specified CSS style from the HTML options. | yii\helpers\BaseHtml
renderSelectOptions() | Renders the option tags that can be used by dropDownList() and listBox(). | yii\helpers\BaseHtml
renderTagAttributes() | Renders the HTML tag attributes. | yii\helpers\BaseHtml
resetButton() | Generates a reset button tag. | yii\helpers\BaseHtml
resetInput() | Generates a reset input button. | yii\helpers\BaseHtml
script() | Generates a script tag. | yii\helpers\BaseHtml
style() | Generates a style tag. | yii\helpers\BaseHtml
submitButton() | Generates a submit button tag. | yii\helpers\BaseHtml
submitInput() | Generates a submit input button. | yii\helpers\BaseHtml
tag() | Generates a complete HTML tag. | yii\helpers\BaseHtml
textInput() | Generates a text input field. | yii\helpers\BaseHtml
textarea() | Generates a text area input. | yii\helpers\BaseHtml
ul() | Generates an unordered list. | yii\helpers\BaseHtml

## Protected Methods

Hide inherited methods

Method | Description | Defined By
--- | --- | ---
activeBooleanInput() | Generates a boolean input This method is mainly called by activeCheckbox() and activeRadio(). | yii\helpers\BaseHtml
activeListInput() | Generates a list of input fields. | yii\helpers\BaseHtml
booleanInput() | Generates a boolean input. | yii\helpers\BaseHtml
setActivePlaceholder() | Generate placeholder from model attribute label. | yii\helpers\BaseHtml

## Property Details

$attributeOrder public static property

The preferred order of attributes in a tag. This mainly affects the order of the attributes that are rendered by renderTagAttributes().

public static array $attributeOrder = ['type', 'id', 'class', 'name', 'value', 'href', 'src', 'srcset', 'form', 'action', 'method', 'selected', 'checked', 'readonly', 'disabled', 'multiple', 'size', 'maxlength', 'width', 'height', 'rows', 'cols', 'alt', 'title', 'rel', 'media']
$attributeRegex public static property (available since version 2.0.12)

Regular expression used for attribute name validation.

public static string $attributeRegex = '/(^|.*\])([\w\.\+]+)(\[.*|$)/u'
$dataAttributes public static property (available since version 2.0.3)

List of tag attributes that should be specially handled when their values are of array type. In particular, if the value of the `data` attribute is `['name' => 'xyz', 'age' => 13]`, two attributes will be generated instead of one: `data-name="xyz" data-age="13"`.

public static array $dataAttributes = ['aria', 'data', 'data-ng', 'ng']
$voidElements public static property

List of void elements (element name => 1)

See also http://www.w3.org/TR/html-markup/syntax.html#void-element.

public static array $voidElements = ['area' => 1, 'base' => 1, 'br' => 1, 'col' => 1, 'command' => 1, 'embed' => 1, 'hr' => 1, 'img' => 1, 'input' => 1, 'keygen' => 1, 'link' => 1, 'meta' => 1, 'param' => 1, 'source' => 1, 'track' => 1, 'wbr' => 1]

## Method Details

a() public static method

Generates a hyperlink tag.

See also yii\helpers\Url::to().

public static string a ( $text, $url = null, $options = [] )
$text | string | Link body. It will NOT be HTML-encoded. Therefore you can pass in HTML code such as an image tag. If this is coming from end users, you should consider encode() it to prevent XSS attacks.
$url | array|string|null | The URL for the hyperlink tag. This parameter will be processed by yii\helpers\Url::to() and will be used for the "href" attribute of the tag. If this parameter is null, the "href" attribute will not be generated. If you want to use an absolute url you can call yii\helpers\Url::to() yourself, before passing the URL to this method, like this:
    Html::a('link text', Url::to($url, true))
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated hyperlink

activeBooleanInput() protected static method (available since version 2.0.9)

Generates a boolean input This method is mainly called by activeCheckbox() and activeRadio().

protected static string activeBooleanInput ( $type, $model, $attribute, $options = [] )
$type | string | The input type. This can be either `radio` or `checkbox`.
$model | yii\base\Model | The model object
$attribute | string | The attribute name or expression. See getAttributeName() for the format about attribute expression.
$options | array | The tag options in terms of name-value pairs. See booleanInput() for details about accepted attributes.
return | string | The generated input element

activeCheckbox() public static method

Generates a checkbox tag together with a label for the given model attribute.

This method will generate the "checked" tag attribute according to the model attribute value.

public static string activeCheckbox ( $model, $attribute, $options = [] )
$model | yii\base\Model | The model object
$attribute | string | The attribute name or expression. See getAttributeName() for the format about attribute expression.
$options | array | The tag options in terms of name-value pairs. See booleanInput() for details about accepted attributes.
return | string | The generated checkbox tag

activeCheckboxList() public static method

Generates a list of checkboxes.

A checkbox list allows multiple selection, like listBox(). As a result, the corresponding submitted value is an array. The selection of the checkbox list is taken from the value of the model attribute.

public static string activeCheckboxList ( $model, $attribute, $items, $options = [] )
$model | yii\base\Model | The model object
$attribute | string | The attribute name or expression. See getAttributeName() for the format about attribute expression.
$items | array | The data item used to generate the checkboxes. The array keys are the checkbox values, and the array values are the corresponding labels. Note that the labels will NOT be HTML-encoded, while the values will.
- $options | array | Options (name => config) for the checkbox list container tag. The following options are specially handled: tag: string|false, the tag name of the container element. False to render checkbox without container. See also tag(). unselect: string, the value that should be submitted when none of the checkboxes is selected. You may set this option to be null to prevent default value submission. If this option is not set, an empty string will be submitted. encode: boolean, whether to HTML-encode the checkbox labels. Defaults to true. This option is ignored if `item` option is set. separator: string, the HTML code that separates items. itemOptions: array, the options for generating the checkbox tag using checkbox(). item: callable, a callback that can be used to customize the generation of the HTML code corresponding to a single item in $items. The signature of this callback must be:
      function ($index, $label, $name, $checked, $value)
where $index is the zero-based index of the checkbox in the whole list; $label is the label for the checkbox; and $name, $value and $checked represent the name, value and the checked status of the checkbox input. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated checkbox list

activeDropDownList() public static method

Generates a drop-down list for the given model attribute.

The selection of the drop-down list is taken from the value of the model attribute.

public static string activeDropDownList ( $model, $attribute, $items, $options = [] )
$model | yii\base\Model | The model object
$attribute | string | The attribute name or expression. See getAttributeName() for the format about attribute expression.
$items | array | The option data items. The array keys are option values, and the array values are the corresponding option labels. The array can also be nested (i.e. some array values are arrays too). For each sub-array, an option group will be generated whose label is the key associated with the sub-array. If you have a list of data models, you may convert them into the format described above using yii\helpers\ArrayHelper::map(). Note, the values and labels will be automatically HTML-encoded by this method, and the blank spaces in the labels will also be HTML-encoded.
- $options | array | The tag options in terms of name-value pairs. The following options are specially handled: prompt: string, a prompt text to be displayed as the first option. Since version 2.0.11 you can use an array to override the value and to set other tag attributes:
      ['text' => 'Please select', 'options' => ['value' => 'none', 'class' => 'prompt', 'label' => 'Select']],
- options: array, the attributes for the select option tags. The array keys must be valid option values, and the array values are the extra attributes for the corresponding option tags. For example,
      [
          'value1' => ['disabled' => true],
          'value2' => ['label' => 'value 2'],
      ];
groups: array, the attributes for the optgroup tags. The structure of this is similar to that of 'options', except that the array keys represent the optgroup labels specified in $items. encodeSpaces: bool, whether to encode spaces in option prompt and option value with `&nbsp;` character. Defaults to false. encode: bool, whether to encode option prompt and option value characters. Defaults to `true`. This option is available since 2.0.3. The rest of the options will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated drop-down list tag

activeFileInput() public static method

Generates a file input tag for the given model attribute.

This method will generate the "name" and "value" tag attributes automatically for the model attribute unless they are explicitly specified in `$options`. Additionally, if a separate set of HTML options array is defined inside `$options` with a key named `hiddenOptions`, it will be passed to the `activeHiddenInput` field as its own `$options` parameter.

public static string activeFileInput ( $model, $attribute, $options = [] )
$model | yii\base\Model | The model object
$attribute | string | The attribute name or expression. See getAttributeName() for the format about attribute expression.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). See renderTagAttributes() for details on how attributes are being rendered. If `hiddenOptions` parameter which is another set of HTML options array is defined, it will be extracted from `$options` to be used for the hidden input.
return | string | The generated input tag

activeHiddenInput() public static method

Generates a hidden input tag for the given model attribute.

This method will generate the "name" and "value" tag attributes automatically for the model attribute unless they are explicitly specified in `$options`.

public static string activeHiddenInput ( $model, $attribute, $options = [] )
$model | yii\base\Model | The model object
$attribute | string | The attribute name or expression. See getAttributeName() for the format about attribute expression.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated input tag

activeHint() public static method (available since version 2.0.4)

Generates a hint tag for the given model attribute.

The hint text is the hint associated with the attribute, obtained via yii\base\Model::getAttributeHint(). If no hint content can be obtained, method will return an empty string.

public static string activeHint ( $model, $attribute, $options = [] )
$model | yii\base\Model | The model object
$attribute | string | The attribute name or expression. See getAttributeName() for the format about attribute expression.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. The following options are specially handled: hint: this specifies the hint to be displayed. Note that this will NOT be encoded. If this is not set, yii\base\Model::getAttributeHint() will be called to get the hint for display (without encoding). See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated hint tag

activeInput() public static method

Generates an input tag for the given model attribute.

This method will generate the "name" and "value" tag attributes automatically for the model attribute unless they are explicitly specified in `$options`.

public static string activeInput ( $type, $model, $attribute, $options = [] )
$type | string | The input type (e.g. 'text', 'password')
$model | yii\base\Model | The model object
$attribute | string | The attribute name or expression. See getAttributeName() for the format about attribute expression.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated input tag

activeLabel() public static method

Generates a label tag for the given model attribute.

The label text is the label associated with the attribute, obtained via yii\base\Model::getAttributeLabel().

public static string activeLabel ( $model, $attribute, $options = [] )
$model | yii\base\Model | The model object
$attribute | string | The attribute name or expression. See getAttributeName() for the format about attribute expression.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. The following options are specially handled: label: this specifies the label to be displayed. Note that this will NOT be encoded. If this is not set, yii\base\Model::getAttributeLabel() will be called to get the label for display (after encoding). See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated label tag

activeListBox() public static method

Generates a list box.

The selection of the list box is taken from the value of the model attribute.

public static string activeListBox ( $model, $attribute, $items, $options = [] )
$model | yii\base\Model | The model object
$attribute | string | The attribute name or expression. See getAttributeName() for the format about attribute expression.
$items | array | The option data items. The array keys are option values, and the array values are the corresponding option labels. The array can also be nested (i.e. some array values are arrays too). For each sub-array, an option group will be generated whose label is the key associated with the sub-array. If you have a list of data models, you may convert them into the format described above using yii\helpers\ArrayHelper::map(). Note, the values and labels will be automatically HTML-encoded by this method, and the blank spaces in the labels will also be HTML-encoded.
- $options | array | The tag options in terms of name-value pairs. The following options are specially handled: prompt: string, a prompt text to be displayed as the first option. Since version 2.0.11 you can use an array to override the value and to set other tag attributes:
      ['text' => 'Please select', 'options' => ['value' => 'none', 'class' => 'prompt', 'label' => 'Select']],
- options: array, the attributes for the select option tags. The array keys must be valid option values, and the array values are the extra attributes for the corresponding option tags. For example,
      [
          'value1' => ['disabled' => true],
          'value2' => ['label' => 'value 2'],
      ];
groups: array, the attributes for the optgroup tags. The structure of this is similar to that of 'options', except that the array keys represent the optgroup labels specified in $items. unselect: string, the value that will be submitted when no option is selected. When this attribute is set, a hidden field will be generated so that if no option is selected in multiple mode, we can still obtain the posted unselect value. encodeSpaces: bool, whether to encode spaces in option prompt and option value with `&nbsp;` character. Defaults to false. encode: bool, whether to encode option prompt and option value characters. Defaults to `true`. This option is available since 2.0.3. The rest of the options will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated list box tag

activeListInput() protected static method

Generates a list of input fields.

This method is mainly called by activeListBox(), activeRadioList() and activeCheckboxList().

protected static string activeListInput ( $type, $model, $attribute, $items, $options = [] )
$type | string | The input type. This can be 'listBox', 'radioList', or 'checkBoxList'.
$model | yii\base\Model | The model object
$attribute | string | The attribute name or expression. See getAttributeName() for the format about attribute expression.
$items | array | The data item used to generate the input fields. The array keys are the input values, and the array values are the corresponding labels. Note that the labels will NOT be HTML-encoded, while the values will.
$options | array | Options (name => config) for the input list. The supported special options depend on the input type specified by `$type`.
return | string | The generated input list

activePasswordInput() public static method

Generates a password input tag for the given model attribute.

This method will generate the "name" and "value" tag attributes automatically for the model attribute unless they are explicitly specified in `$options`.

public static string activePasswordInput ( $model, $attribute, $options = [] )
$model | yii\base\Model | The model object
$attribute | string | The attribute name or expression. See getAttributeName() for the format about attribute expression.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). See renderTagAttributes() for details on how attributes are being rendered. The following special options are recognized: maxlength: integer|boolean, when `maxlength` is set true and the model attribute is validated by a string validator, the `maxlength` option will take the value of yii\validators\StringValidator::$max. This option is available since version 2.0.6. placeholder: string|boolean, when `placeholder` equals `true`, the attribute label from the $model will be used as a placeholder (this behavior is available since version 2.0.14).
return | string | The generated input tag

activeRadio() public static method

Generates a radio button tag together with a label for the given model attribute.

This method will generate the "checked" tag attribute according to the model attribute value.

public static string activeRadio ( $model, $attribute, $options = [] )
$model | yii\base\Model | The model object
$attribute | string | The attribute name or expression. See getAttributeName() for the format about attribute expression.
$options | array | The tag options in terms of name-value pairs. See booleanInput() for details about accepted attributes.
return | string | The generated radio button tag

activeRadioList() public static method

Generates a list of radio buttons.

A radio button list is like a checkbox list, except that it only allows single selection. The selection of the radio buttons is taken from the value of the model attribute.

public static string activeRadioList ( $model, $attribute, $items, $options = [] )
$model | yii\base\Model | The model object
$attribute | string | The attribute name or expression. See getAttributeName() for the format about attribute expression.
$items | array | The data item used to generate the radio buttons. The array keys are the radio values, and the array values are the corresponding labels. Note that the labels will NOT be HTML-encoded, while the values will.
- $options | array | Options (name => config) for the radio button list container tag. The following options are specially handled: tag: string|false, the tag name of the container element. False to render radio button without container. See also tag(). unselect: string, the value that should be submitted when none of the radio buttons is selected. You may set this option to be null to prevent default value submission. If this option is not set, an empty string will be submitted. encode: boolean, whether to HTML-encode the checkbox labels. Defaults to true. This option is ignored if `item` option is set. separator: string, the HTML code that separates items. itemOptions: array, the options for generating the radio button tag using radio(). item: callable, a callback that can be used to customize the generation of the HTML code corresponding to a single item in $items. The signature of this callback must be:
      function ($index, $label, $name, $checked, $value)
where $index is the zero-based index of the radio button in the whole list; $label is the label for the radio button; and $name, $value and $checked represent the name, value and the checked status of the radio button input. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated radio button list

activeTextInput() public static method

Generates a text input tag for the given model attribute.

This method will generate the "name" and "value" tag attributes automatically for the model attribute unless they are explicitly specified in `$options`.

public static string activeTextInput ( $model, $attribute, $options = [] )
$model | yii\base\Model | The model object
$attribute | string | The attribute name or expression. See getAttributeName() for the format about attribute expression.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). See renderTagAttributes() for details on how attributes are being rendered. The following special options are recognized: maxlength: integer|boolean, when `maxlength` is set true and the model attribute is validated by a string validator, the `maxlength` option will take the value of yii\validators\StringValidator::$max. This is available since version 2.0.3. placeholder: string|boolean, when `placeholder` equals `true`, the attribute label from the $model will be used as a placeholder (this behavior is available since version 2.0.14).
return | string | The generated input tag

activeTextarea() public static method

Generates a textarea tag for the given model attribute.

The model attribute value will be used as the content in the textarea.

public static string activeTextarea ( $model, $attribute, $options = [] )
$model | yii\base\Model | The model object
$attribute | string | The attribute name or expression. See getAttributeName() for the format about attribute expression.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). See renderTagAttributes() for details on how attributes are being rendered. The following special options are recognized: maxlength: integer|boolean, when `maxlength` is set true and the model attribute is validated by a string validator, the `maxlength` option will take the value of yii\validators\StringValidator::$max. This option is available since version 2.0.6. placeholder: string|boolean, when `placeholder` equals `true`, the attribute label from the $model will be used as a placeholder (this behavior is available since version 2.0.14).
return | string | The generated textarea tag

addCssClass() public static method

Adds a CSS class (or several classes) to the specified options.

If the CSS class is already in the options, it will not be added again. If class specification at given options is an array, and some class placed there with the named (string) key, overriding of such key will have no effect. For example:

    $options = ['class' => ['persistent' => 'initial']];
    Html::addCssClass($options, ['persistent' => 'override']);
    var_dump($options['class']); // outputs: array('persistent' => 'initial');

See also:

- mergeCssClasses()
- removeCssClass()

public static void addCssClass ( &$options, $class )
$options | array | The options to be modified.
$class | string|array | The CSS class(es) to be added

addCssStyle() public static method

Adds the specified CSS style to the HTML options.

If the options already contain a `style` element, the new style will be merged with the existing one. If a CSS property exists in both the new and the old styles, the old one may be overwritten if `$overwrite` is true.

For example,

    Html::addCssStyle($options, 'width: 100px; height: 200px');

See also:

- removeCssStyle()
- cssStyleFromArray()
- cssStyleToArray()

public static void addCssStyle ( &$options, $style, $overwrite = true )
$options | array | The HTML options to be modified.
$style | string|array | The new style string (e.g. `'width: 100px; height: 200px'`) or array (e.g. `['width' => '100px', 'height' => '200px']`).
$overwrite | boolean | Whether to overwrite existing CSS properties if the new style contain them too.

beginForm() public static method

Generates a form start tag.

See also endForm().

public static string beginForm ( $action = '', $method = 'post', $options = [] )
$action | array|string | The form action URL. This parameter will be processed by yii\helpers\Url::to().
$method | string | The form submission method, such as "post", "get", "put", "delete" (case-insensitive). Since most browsers only support "post" and "get", if other methods are given, they will be simulated using "post", and a hidden input will be added which contains the actual method type. See yii\web\Request::$methodParam for more details.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered. Special options: `csrf`: whether to generate the CSRF hidden input. Defaults to true.
return | string | The generated form start tag.

beginTag() public static method

Generates a start tag.

See also:

- endTag()
- tag()

public static string beginTag ( $name, $options = [] )
$name | string|boolean|null | The tag name. If $name is `null` or `false`, the corresponding content will be rendered without any tag.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated start tag

booleanInput() protected static method (available since version 2.0.9)

Generates a boolean input.

protected static string booleanInput ( $type, $name, $checked = false, $options = [] )
$type | string | The input type. This can be either `radio` or `checkbox`.
$name | string | The name attribute.
$checked | boolean | Whether the checkbox should be checked.
$options | array | The tag options in terms of name-value pairs. The following options are specially handled: uncheck: string, the value associated with the uncheck state of the checkbox. When this attribute is present, a hidden input will be generated so that if the checkbox is not checked and is submitted, the value of this attribute will still be submitted to the server via the hidden input. label: string, a label displayed next to the checkbox. It will NOT be HTML-encoded. Therefore you can pass in HTML code such as an image tag. If this is is coming from end users, you should encode() it to prevent XSS attacks. When this option is specified, the checkbox will be enclosed by a label tag. labelOptions: array, the HTML attributes for the label tag. Do not set this option unless you set the "label" option. The rest of the options will be rendered as the attributes of the resulting checkbox tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated checkbox tag

button() public static method

Generates a button tag.

public static string button ( $content = 'Button', $options = [] )
$content | string | The content enclosed within the button tag. It will NOT be HTML-encoded. Therefore you can pass in HTML code such as an image tag. If this is is coming from end users, you should consider encode() it to prevent XSS attacks.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated button tag

buttonInput() public static method

Generates an input button.

public static string buttonInput ( $label = 'Button', $options = [] )
$label | string | The value attribute. If it is null, the value attribute will not be generated.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated button tag

checkbox() public static method

Generates a checkbox input.

public static string checkbox ( $name, $checked = false, $options = [] )
$name | string | The name attribute.
$checked | boolean | Whether the checkbox should be checked.
$options | array | The tag options in terms of name-value pairs. See booleanInput() for details about accepted attributes.
return | string | The generated checkbox tag

checkboxList() public static method

Generates a list of checkboxes.

A checkbox list allows multiple selection, like listBox(). As a result, the corresponding submitted value is an array.

public static string checkboxList ( $name, $selection = null, $items = [], $options = [] )
$name | string | The name attribute of each checkbox.
$selection | string|array|null | The selected value(s). String for single or array for multiple selection(s).
$items | array | The data item used to generate the checkboxes. The array keys are the checkbox values, while the array values are the corresponding labels.
- $options | array | Options (name => config) for the checkbox list container tag. The following options are specially handled: tag: string|false, the tag name of the container element. False to render checkbox without container. See also tag(). unselect: string, the value that should be submitted when none of the checkboxes is selected. By setting this option, a hidden input will be generated. disabled: boolean, whether the generated by unselect option hidden input should be disabled. Defaults to false. This option is available since version 2.0.16. encode: boolean, whether to HTML-encode the checkbox labels. Defaults to true. This option is ignored if `item` option is set. strict: boolean, if `$selection` is an array and this value is true a strict comparison will be performed on `$items` keys. Defaults to false. This option is available since 2.0.37. separator: string, the HTML code that separates items. itemOptions: array, the options for generating the checkbox tag using checkbox(). item: callable, a callback that can be used to customize the generation of the HTML code corresponding to a single item in $items. The signature of this callback must be:
      function ($index, $label, $name, $checked, $value)
where $index is the zero-based index of the checkbox in the whole list; $label is the label for the checkbox; and $name, $value and $checked represent the name, value and the checked status of the checkbox input, respectively. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated checkbox list

csrfMetaTags() public static method

Generates the meta tags containing CSRF token information.

See also yii\web\Request::$enableCsrfValidation.

public static string csrfMetaTags ( )
return | string | The generated meta tags

cssFile() public static method

Generates a link tag that refers to an external CSS file.

See also yii\helpers\Url::to().

public static string cssFile ( $url, $options = [] )
$url | array|string | The URL of the external CSS file. This parameter will be processed by yii\helpers\Url::to().
$options | array | The tag options in terms of name-value pairs. The following options are specially handled: condition: specifies the conditional comments for IE, e.g., `lt IE 9`. When this is specified, the generated `link` tag will be enclosed within the conditional comments. This is mainly useful for supporting old versions of IE browsers. noscript: if set to true, `link` tag will be wrapped into `<noscript>` tags. The rest of the options will be rendered as the attributes of the resulting link tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated link tag

cssStyleFromArray() public static method

Converts a CSS style array into a string representation.

For example,

    print_r(Html::cssStyleFromArray(['width' => '100px', 'height' => '200px']));
    // will display: 'width: 100px; height: 200px;'

public static string cssStyleFromArray ( array $style )
$style | array | The CSS style array. The array keys are the CSS property names, and the array values are the corresponding CSS property values.
return | string | The CSS style string. If the CSS style is empty, a null will be returned.

cssStyleToArray() public static method

Converts a CSS style string into an array representation.

The array keys are the CSS property names, and the array values are the corresponding CSS property values.

For example,

    print_r(Html::cssStyleToArray('width: 100px; height: 200px;'));
    // will display: ['width' => '100px', 'height' => '200px']

public static array cssStyleToArray ( $style )
$style | string | The CSS style string
return | array | The array representation of the CSS style

decode() public static method

Decodes special HTML entities back to the corresponding characters.

This is the opposite of encode().

See also:

- encode()
- https://secure.php.net/manual/en/function.htmlspecialchars-decode.php

public static string decode ( $content )
$content | string | The content to be decoded
return | string | The decoded content

dropDownList() public static method

Generates a drop-down list.

public static string dropDownList ( $name, $selection = null, $items = [], $options = [] )
$name | string | The input name
$selection | string|array|null | The selected value(s). String for single or array for multiple selection(s).
$items | array | The option data items. The array keys are option values, and the array values are the corresponding option labels. The array can also be nested (i.e. some array values are arrays too). For each sub-array, an option group will be generated whose label is the key associated with the sub-array. If you have a list of data models, you may convert them into the format described above using yii\helpers\ArrayHelper::map(). Note, the values and labels will be automatically HTML-encoded by this method, and the blank spaces in the labels will also be HTML-encoded.
- $options | array | The tag options in terms of name-value pairs. The following options are specially handled: prompt: string, a prompt text to be displayed as the first option. Since version 2.0.11 you can use an array to override the value and to set other tag attributes:
      ['text' => 'Please select', 'options' => ['value' => 'none', 'class' => 'prompt', 'label' => 'Select']],
- options: array, the attributes for the select option tags. The array keys must be valid option values, and the array values are the extra attributes for the corresponding option tags. For example,
      [
          'value1' => ['disabled' => true],
          'value2' => ['label' => 'value 2'],
      ];
groups: array, the attributes for the optgroup tags. The structure of this is similar to that of 'options', except that the array keys represent the optgroup labels specified in $items. encodeSpaces: bool, whether to encode spaces in option prompt and option value with `&nbsp;` character. Defaults to false. encode: bool, whether to encode option prompt and option value characters. Defaults to `true`. This option is available since 2.0.3. strict: boolean, if `$selection` is an array and this value is true a strict comparison will be performed on `$items` keys. Defaults to false. This option is available since 2.0.37. The rest of the options will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated drop-down list tag

encode() public static method

Encodes special characters into HTML entities.

The application charset will be used for encoding.

See also:

- decode()
- https://secure.php.net/manual/en/function.htmlspecialchars.php

public static string encode ( $content, $doubleEncode = true )
$content | string | The content to be encoded
$doubleEncode | boolean | Whether to encode HTML entities in `$content`. If false, HTML entities in `$content` will not be further encoded.
return | string | The encoded content

endForm() public static method

Generates a form end tag.

See also beginForm().

public static string endForm ( )
return | string | The generated tag

endTag() public static method

Generates an end tag.

See also:

- beginTag()
- tag()

public static string endTag ( $name )
$name | string|boolean|null | The tag name. If $name is `null` or `false`, the corresponding content will be rendered without any tag.
return | string | The generated end tag

error() public static method

Generates a tag that contains the first validation error of the specified model attribute.

Note that even if there is no validation error, this method will still return an empty error tag.

public static string error ( $model, $attribute, $options = [] )
$model | yii\base\Model | The model object
$attribute | string | The attribute name or expression. See getAttributeName() for the format about attribute expression.
$options | array | The tag options in terms of name-value pairs. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. The following options are specially handled: tag: this specifies the tag name. If not set, "div" will be used. See also tag(). encode: boolean, if set to false then the error message won't be encoded. errorSource (since 2.0.14): \Closure|callable, callback that will be called to obtain an error message. The signature of the callback must be: `function ($model, $attribute)` and return a string. When not set, the `$model->getFirstError()` method will be called. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated label tag

errorSummary() public static method

Generates a summary of the validation errors.

If there is no validation error, an empty error summary markup will still be generated, but it will be hidden.

public static string errorSummary ( $models, $options = [] )
$models | yii\base\Model|yii\base\Model[] | The model(s) whose validation errors are to be displayed.
$options | array | The tag options in terms of name-value pairs. The following options are specially handled: header: string, the header HTML for the error summary. If not set, a default prompt string will be used. footer: string, the footer HTML for the error summary. Defaults to empty string. encode: boolean, if set to false then the error messages won't be encoded. Defaults to `true`. showAllErrors: boolean, if set to true every error message for each attribute will be shown otherwise only the first error message for each attribute will be shown. Defaults to `false`. Option is available since 2.0.10. The rest of the options will be rendered as the attributes of the container tag.
return | string | The generated error summary

escapeJsRegularExpression() public static method (available since version 2.0.6)

Escapes regular expression to use in JavaScript.

public static string escapeJsRegularExpression ( $regexp )
$regexp | string | The regular expression to be escaped.
return | string | The escaped result.

fileInput() public static method

Generates a file input field.

To use a file input field, you should set the enclosing form's "enctype" attribute to be "multipart/form-data". After the form is submitted, the uploaded file information can be obtained via $_FILES[$name] (see PHP documentation).

public static string fileInput ( $name, $value = null, $options = [] )
$name | string | The name attribute.
$value | string|null | The value attribute. If it is null, the value attribute will not be generated.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated file input tag

getAttributeName() public static method

Returns the real attribute name from the given attribute expression.

An attribute expression is an attribute name prefixed and/or suffixed with array indexes. It is mainly used in tabular data input and/or input of array type. Below are some examples:

- `[0]content` is used in tabular data input to represent the "content" attribute for the first model in tabular input;
- `dates[0]` represents the first array element of the "dates" attribute;
- `[0]dates[0]` represents the first array element of the "dates" attribute for the first model in tabular input.

If `$attribute` has neither prefix nor suffix, it will be returned back without change.

public static string getAttributeName ( $attribute )
$attribute | string | The attribute name or expression
return | string | The attribute name without prefix and suffix.
throws | yii\base\InvalidArgumentException | if the attribute name contains non-word characters.

getAttributeValue() public static method

Returns the value of the specified attribute name or expression.

For an attribute expression like `[0]dates[0]`, this method will return the value of `$model->dates[0]`. See getAttributeName() for more details about attribute expression.

If an attribute value is an instance of yii\db\ActiveRecordInterface or an array of such instances, the primary value(s) of the AR instance(s) will be returned instead.

public static string|array getAttributeValue ( $model, $attribute )
$model | yii\base\Model | The model object
$attribute | string | The attribute name or expression
return | string|array | The corresponding attribute value
throws | yii\base\InvalidArgumentException | if the attribute name contains non-word characters.

getInputId() public static method

Generates an appropriate input ID for the specified attribute name or expression.

This method converts the result getInputName() into a valid input ID. For example, if getInputName() returns `Post[content]`, this method will return `post-content`.

public static string getInputId ( $model, $attribute )
$model | yii\base\Model | The model object
$attribute | string | The attribute name or expression. See getAttributeName() for explanation of attribute expression.
return | string | The generated input ID
throws | yii\base\InvalidArgumentException | if the attribute name contains non-word characters.

getInputName() public static method

Generates an appropriate input name for the specified attribute name or expression.

This method generates a name that can be used as the input name to collect user input for the specified attribute. The name is generated according to the form name of the model and the given attribute name. For example, if the form name of the `Post` model is `Post`, then the input name generated for the `content` attribute would be `Post[content]`.

See getAttributeName() for explanation of attribute expression.

public static string getInputName ( $model, $attribute )
$model | yii\base\Model | The model object
$attribute | string | The attribute name or expression
return | string | The generated input name
throws | yii\base\InvalidArgumentException | if the attribute name contains non-word characters.

hiddenInput() public static method

Generates a hidden input field.

public static string hiddenInput ( $name, $value = null, $options = [] )
$name | string | The name attribute.
$value | string|null | The value attribute. If it is null, the value attribute will not be generated.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated hidden input tag

img() public static method

Generates an image tag.

public static string img ( $src, $options = [] )
$src | array|string | The image URL. This parameter will be processed by yii\helpers\Url::to().
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered. Since version 2.0.12 It is possible to pass the `srcset` option as an array which keys are descriptors and values are URLs. All URLs will be processed by yii\helpers\Url::to().
return | string | The generated image tag.

input() public static method

Generates an input type of the given type.

public static string input ( $type, $name = null, $value = null, $options = [] )
$type | string | The type attribute.
$name | string|null | The name attribute. If it is null, the name attribute will not be generated.
$value | string|null | The value attribute. If it is null, the value attribute will not be generated.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated input tag

jsFile() public static method

Generates a script tag that refers to an external JavaScript file.

See also yii\helpers\Url::to().

public static string jsFile ( $url, $options = [] )
$url | string | The URL of the external JavaScript file. This parameter will be processed by yii\helpers\Url::to().
$options | array | The tag options in terms of name-value pairs. The following option is specially handled: condition: specifies the conditional comments for IE, e.g., `lt IE 9`. When this is specified, the generated `script` tag will be enclosed within the conditional comments. This is mainly useful for supporting old versions of IE browsers. The rest of the options will be rendered as the attributes of the resulting script tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated script tag

label() public static method

Generates a label tag.

public static string label ( $content, $for = null, $options = [] )
$content | string | Label text. It will NOT be HTML-encoded. Therefore you can pass in HTML code such as an image tag. If this is is coming from end users, you should encode() it to prevent XSS attacks.
$for | string|null | The ID of the HTML element that this label is associated with. If this is null, the "for" attribute will not be generated.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated label tag

listBox() public static method

Generates a list box.

public static string listBox ( $name, $selection = null, $items = [], $options = [] )
$name | string | The input name
$selection | string|array|null | The selected value(s). String for single or array for multiple selection(s).
$items | array | The option data items. The array keys are option values, and the array values are the corresponding option labels. The array can also be nested (i.e. some array values are arrays too). For each sub-array, an option group will be generated whose label is the key associated with the sub-array. If you have a list of data models, you may convert them into the format described above using yii\helpers\ArrayHelper::map(). Note, the values and labels will be automatically HTML-encoded by this method, and the blank spaces in the labels will also be HTML-encoded.
- $options | array | The tag options in terms of name-value pairs. The following options are specially handled: prompt: string, a prompt text to be displayed as the first option. Since version 2.0.11 you can use an array to override the value and to set other tag attributes:
      ['text' => 'Please select', 'options' => ['value' => 'none', 'class' => 'prompt', 'label' => 'Select']],
- options: array, the attributes for the select option tags. The array keys must be valid option values, and the array values are the extra attributes for the corresponding option tags. For example,
      [
          'value1' => ['disabled' => true],
          'value2' => ['label' => 'value 2'],
      ];
groups: array, the attributes for the optgroup tags. The structure of this is similar to that of 'options', except that the array keys represent the optgroup labels specified in $items. unselect: string, the value that will be submitted when no option is selected. When this attribute is set, a hidden field will be generated so that if no option is selected in multiple mode, we can still obtain the posted unselect value. encodeSpaces: bool, whether to encode spaces in option prompt and option value with `&nbsp;` character. Defaults to false. encode: bool, whether to encode option prompt and option value characters. Defaults to `true`. This option is available since 2.0.3. strict: boolean, if `$selection` is an array and this value is true a strict comparison will be performed on `$items` keys. Defaults to false. This option is available since 2.0.37. The rest of the options will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated list box tag

mailto() public static method

Generates a mailto hyperlink.

public static string mailto ( $text, $email = null, $options = [] )
$text | string | Link body. It will NOT be HTML-encoded. Therefore you can pass in HTML code such as an image tag. If this is coming from end users, you should consider encode() it to prevent XSS attacks.
$email | string|null | Email address. If this is null, the first parameter (link body) will be treated as the email address and used.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated mailto link

ol() public static method

Generates an ordered list.

public static string ol ( $items, $options = [] )
$items | array|Traversable | The items for generating the list. Each item generates a single list item. Note that items will be automatically HTML encoded if `$options['encode']` is not set or true.
- $options | array | Options (name => config) for the radio button list. The following options are supported: encode: boolean, whether to HTML-encode the items. Defaults to true. This option is ignored if the `item` option is specified. itemOptions: array, the HTML attributes for the `li` tags. This option is ignored if the `item` option is specified. item: callable, a callback that is used to generate each individual list item. The signature of this callback must be:
      function ($item, $index)
where $index is the array key corresponding to `$item` in `$items`. The callback should return the whole list item tag. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated ordered list. An empty string is returned if `$items` is empty.

passwordInput() public static method

Generates a password input field.

public static string passwordInput ( $name, $value = null, $options = [] )
$name | string | The name attribute.
$value | string|null | The value attribute. If it is null, the value attribute will not be generated.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated password input tag

radio() public static method

Generates a radio button input.

public static string radio ( $name, $checked = false, $options = [] )
$name | string | The name attribute.
$checked | boolean | Whether the radio button should be checked.
$options | array | The tag options in terms of name-value pairs. See booleanInput() for details about accepted attributes.
return | string | The generated radio button tag

radioList() public static method

Generates a list of radio buttons.

A radio button list is like a checkbox list, except that it only allows single selection.

public static string radioList ( $name, $selection = null, $items = [], $options = [] )
$name | string | The name attribute of each radio button.
$selection | string|array|null | The selected value(s). String for single or array for multiple selection(s).
$items | array | The data item used to generate the radio buttons. The array keys are the radio button values, while the array values are the corresponding labels.
- $options | array | Options (name => config) for the radio button list container tag. The following options are specially handled: tag: string|false, the tag name of the container element. False to render radio buttons without container. See also tag(). unselect: string, the value that should be submitted when none of the radio buttons is selected. By setting this option, a hidden input will be generated. disabled: boolean, whether the generated by unselect option hidden input should be disabled. Defaults to false. This option is available since version 2.0.16. encode: boolean, whether to HTML-encode the checkbox labels. Defaults to true. This option is ignored if `item` option is set. strict: boolean, if `$selection` is an array and this value is true a strict comparison will be performed on `$items` keys. Defaults to false. This option is available since 2.0.37. separator: string, the HTML code that separates items. itemOptions: array, the options for generating the radio button tag using radio(). item: callable, a callback that can be used to customize the generation of the HTML code corresponding to a single item in $items. The signature of this callback must be:
      function ($index, $label, $name, $checked, $value)
where $index is the zero-based index of the radio button in the whole list; $label is the label for the radio button; and $name, $value and $checked represent the name, value and the checked status of the radio button input, respectively. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated radio button list

removeCssClass() public static method

Removes a CSS class from the specified options.

See also addCssClass().

public static void removeCssClass ( &$options, $class )
$options | array | The options to be modified.
$class | string|array | The CSS class(es) to be removed

removeCssStyle() public static method

Removes the specified CSS style from the HTML options.

For example,

    Html::removeCssStyle($options, ['width', 'height']);

See also addCssStyle().

public static void removeCssStyle ( &$options, $properties )
$options | array | The HTML options to be modified.
$properties | string|array | The CSS properties to be removed. You may use a string if you are removing a single property.

renderSelectOptions() public static method

Renders the option tags that can be used by dropDownList() and listBox().

public static string renderSelectOptions ( $selection, $items, &$tagOptions = [] )
$selection | string|array|null | The selected value(s). String for single or array for multiple selection(s).
$items | array | The option data items. The array keys are option values, and the array values are the corresponding option labels. The array can also be nested (i.e. some array values are arrays too). For each sub-array, an option group will be generated whose label is the key associated with the sub-array. If you have a list of data models, you may convert them into the format described above using yii\helpers\ArrayHelper::map(). Note, the values and labels will be automatically HTML-encoded by this method, and the blank spaces in the labels will also be HTML-encoded.
$tagOptions | array | The $options parameter that is passed to the dropDownList() or listBox() call. This method will take out these elements, if any: "prompt", "options" and "groups". See more details in dropDownList() for the explanation of these elements.
return | string | The generated list options

renderTagAttributes() public static method

Renders the HTML tag attributes.

Attributes whose values are of boolean type will be treated as boolean attributes.

Attributes whose values are null will not be rendered.

The values of attributes will be HTML-encoded using encode().

`aria` and `data` attributes get special handling when they are set to an array value. In these cases, the array will be "expanded" and a list of ARIA/data attributes will be rendered. For example, `'aria' => ['role' => 'checkbox', 'value' => 'true']` would be rendered as `aria-role="checkbox" aria-value="true"`.

If a nested `data` value is set to an array, it will be JSON-encoded. For example, `'data' => ['params' => ['id' => 1, 'name' => 'yii']]` would be rendered as `data-params='{"id":1,"name":"yii"}'`.

See also addCssClass().

public static string renderTagAttributes ( $attributes )
$attributes | array | Attributes to be rendered. The attribute values will be HTML-encoded using encode().
return | string | The rendering result. If the attributes are not empty, they will be rendered into a string with a leading white space (so that it can be directly appended to the tag name in a tag). If there is no attribute, an empty string will be returned.

resetButton() public static method

Generates a reset button tag.

public static string resetButton ( $content = 'Reset', $options = [] )
$content | string | The content enclosed within the button tag. It will NOT be HTML-encoded. Therefore you can pass in HTML code such as an image tag. If this is is coming from end users, you should consider encode() it to prevent XSS attacks.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated reset button tag

resetInput() public static method

Generates a reset input button.

public static string resetInput ( $label = 'Reset', $options = [] )
$label | string | The value attribute. If it is null, the value attribute will not be generated.
$options | array | The attributes of the button tag. The values will be HTML-encoded using encode(). Attributes whose value is null will be ignored and not put in the tag returned. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated button tag

script() public static method

Generates a script tag.

public static string script ( $content, $options = [] )
$content | string | The script content
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated script tag

setActivePlaceholder() protected static method (available since version 2.0.14)

Generate placeholder from model attribute label.

protected static void setActivePlaceholder ( $model, $attribute, &$options = [] )
$model | yii\base\Model | The model object
$attribute | string | The attribute name or expression. See getAttributeName() for the format about attribute expression.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode().

style() public static method

Generates a style tag.

public static string style ( $content, $options = [] )
$content | string | The style content
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated style tag

submitButton() public static method

Generates a submit button tag.

Be careful when naming form elements such as submit buttons. According to the jQuery documentation there are some reserved names that can cause conflicts, e.g. `submit`, `length`, or `method`.

public static string submitButton ( $content = 'Submit', $options = [] )
$content | string | The content enclosed within the button tag. It will NOT be HTML-encoded. Therefore you can pass in HTML code such as an image tag. If this is is coming from end users, you should consider encode() it to prevent XSS attacks.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated submit button tag

submitInput() public static method

Generates a submit input button.

Be careful when naming form elements such as submit buttons. According to the jQuery documentation there are some reserved names that can cause conflicts, e.g. `submit`, `length`, or `method`.

public static string submitInput ( $label = 'Submit', $options = [] )
$label | string | The value attribute. If it is null, the value attribute will not be generated.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated button tag

tag() public static method

Generates a complete HTML tag.

See also:

- beginTag()
- endTag()

public static string tag ( $name, $content = '', $options = [] )
$name | string|boolean|null | The tag name. If $name is `null` or `false`, the corresponding content will be rendered without any tag.
$content | string | The content to be enclosed between the start and end tags. It will not be HTML-encoded. If this is coming from end users, you should consider encode() it to prevent XSS attacks.
$options | array | The HTML tag attributes (HTML options) in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. For example when using `['class' => 'my-class', 'target' => '_blank', 'value' => null]` it will result in the html attributes rendered like this: `class="my-class" target="_blank"`. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated HTML tag

textInput() public static method

Generates a text input field.

public static string textInput ( $name, $value = null, $options = [] )
$name | string | The name attribute.
$value | string|null | The value attribute. If it is null, the value attribute will not be generated.
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated text input tag

textarea() public static method

Generates a text area input.

public static string textarea ( $name, $value = '', $options = [] )
$name | string | The input name
$value | string | The input value. Note that it will be encoded using encode().
$options | array | The tag options in terms of name-value pairs. These will be rendered as the attributes of the resulting tag. The values will be HTML-encoded using encode(). If a value is null, the corresponding attribute will not be rendered. See renderTagAttributes() for details on how attributes are being rendered. The following special options are recognized: `doubleEncode`: whether to double encode HTML entities in `$value`. If `false`, HTML entities in `$value` will not be further encoded. This option is available since version 2.0.11.
return | string | The generated text area tag

ul() public static method

Generates an unordered list.

public static string ul ( $items, $options = [] )
$items | array|Traversable | The items for generating the list. Each item generates a single list item. Note that items will be automatically HTML encoded if `$options['encode']` is not set or true.
- $options | array | Options (name => config) for the radio button list. The following options are supported: encode: boolean, whether to HTML-encode the items. Defaults to true. This option is ignored if the `item` option is specified. separator: string, the HTML code that separates items. Defaults to a simple newline (`"\n"`). This option is available since version 2.0.7. itemOptions: array, the HTML attributes for the `li` tags. This option is ignored if the `item` option is specified. item: callable, a callback that is used to generate each individual list item. The signature of this callback must be:
      function ($item, $index)
where $index is the array key corresponding to `$item` in `$items`. The callback should return the whole list item tag. See renderTagAttributes() for details on how attributes are being rendered.
return | string | The generated unordered list. An empty list tag will be returned if `$items` is empty.