# Class yii\base\Action

Inheritance | yii\base\Action » yii\base\Component » yii\base\BaseObject
Implements | yii\base\Configurable

Subclasses

yii\authclient\AuthAction, yii\base\InlineAction, yii\captcha\CaptchaAction, yii\debug\actions\db\ExplainAction, yii\elasticsearch\DebugAction, yii\gii\console\GenerateAction, yii\httpclient\debug\RequestExecuteAction, yii\mongodb\debug\ExplainAction, yii\rest\Action, yii\rest\CreateAction, yii\rest\DeleteAction, yii\rest\IndexAction, yii\rest\OptionsAction, yii\rest\UpdateAction, yii\rest\ViewAction, yii\web\ErrorAction, yii\web\ViewAction

Available since version | 2.0
Source Code | https://github.com/yiisoft/yii2/blob/master/framework/base/Action.php

Action is the base class for all controller action classes.

Action provides a way to reuse action method code. An action method in an Action class can be used in multiple controllers or in different projects.

Derived classes must implement a method named `run()`. This method will be invoked by the controller when the action is requested. The `run()` method can have parameters which will be filled up with user input values automatically according to their names. For example, if the `run()` method is declared as follows:

    public function run($id, $type = 'book') { ... }

And the parameters provided for the action are: `['id' => 1]`. Then the `run()` method will be invoked as `run(1)` automatically.

For more details and usage information on Action, see the guide article on actions.

## Public Properties

Hide inherited properties

Property | Type | Description | Defined By
--- | --- | --- | ---
$behaviors | yii\base\Behavior[] | List of behaviors attached to this component. This property is read-only. | yii\base\Component
$controller | yii\base\Controller|yii\web\Controller|yii\console\Controller | The controller that owns this action | yii\base\Action
$id | string | ID of the action | yii\base\Action
$uniqueId | string | The unique ID of this action among the whole application. This property is read-only. | yii\base\Action

## Public Methods

Hide inherited methods

Method | Description | Defined By
--- | --- | ---
__call() | Calls the named method which is not a class method. | yii\base\Component
__clone() | This method is called after the object is created by cloning an existing one. | yii\base\Component
__construct() | Constructor. | yii\base\Action
__get() | Returns the value of a component property. | yii\base\Component
__isset() | Checks if a property is set, i.e. defined and not null. | yii\base\Component
__set() | Sets the value of a component property. | yii\base\Component
__unset() | Sets a component property to be null. | yii\base\Component
attachBehavior() | Attaches a behavior to this component. | yii\base\Component
attachBehaviors() | Attaches a list of behaviors to the component. | yii\base\Component
behaviors() | Returns a list of behaviors that this component should behave as. | yii\base\Component
canGetProperty() | Returns a value indicating whether a property can be read. | yii\base\Component
canSetProperty() | Returns a value indicating whether a property can be set. | yii\base\Component
className() | Returns the fully qualified name of this class. | yii\base\BaseObject
detachBehavior() | Detaches a behavior from the component. | yii\base\Component
detachBehaviors() | Detaches all behaviors from the component. | yii\base\Component
ensureBehaviors() | Makes sure that the behaviors declared in behaviors() are attached to this component. | yii\base\Component
getBehavior() | Returns the named behavior object. | yii\base\Component
getBehaviors() | Returns all behaviors attached to this component. | yii\base\Component
getUniqueId() | Returns the unique ID of this action among the whole application. | yii\base\Action
hasEventHandlers() | Returns a value indicating whether there is any handler attached to the named event. | yii\base\Component
hasMethod() | Returns a value indicating whether a method is defined. | yii\base\Component
hasProperty() | Returns a value indicating whether a property is defined for this component. | yii\base\Component
init() | Initializes the object. | yii\base\BaseObject
off() | Detaches an existing event handler from this component. | yii\base\Component
on() | Attaches an event handler to an event. | yii\base\Component
runWithParams() | Runs this action with the specified parameters. | yii\base\Action
trigger() | Triggers an event. | yii\base\Component

## Protected Methods

Hide inherited methods

Method | Description | Defined By
--- | --- | ---
afterRun() | This method is called right after `run()` is executed. | yii\base\Action
beforeRun() | This method is called right before `run()` is executed. | yii\base\Action

## Property Details

$controller public property

The controller that owns this action

public yii\base\Controller|yii\web\Controller|yii\console\Controller $controller = null
$id public property

ID of the action

public string $id = null
$uniqueId public property

The unique ID of this action among the whole application. This property is read-only.

public string $uniqueId = null

## Method Details

__construct() public method

Constructor.

public void __construct ( $id, $controller, $config = [] )
$id | string | The ID of this action
$controller | yii\base\Controller | The controller that owns this action
$config | array | Name-value pairs that will be used to initialize the object properties

afterRun() protected method

This method is called right after `run()` is executed.

You may override this method to do post-processing work for the action run.

protected void afterRun ( )

beforeRun() protected method

This method is called right before `run()` is executed.

You may override this method to do preparation work for the action run. If the method returns false, it will cancel the action.

protected boolean beforeRun ( )
return | boolean | Whether to run the action.

getUniqueId() public method

Returns the unique ID of this action among the whole application.

public string getUniqueId ( )
return | string | The unique ID of this action among the whole application.

runWithParams() public method

Runs this action with the specified parameters.

This method is mainly invoked by the controller.

public mixed runWithParams ( $params )
$params | array | The parameters to be bound to the action's run() method.
return | mixed | The result of the action
throws | yii\base\InvalidConfigException | if the action class does not have a run() method