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CJavaScript

Package system.web.helpers
Inheritance class CJavaScript
Since 1.0
Version $Id$
Source Code framework/web/helpers/CJavaScript.php
CJavaScript is a helper class containing JavaScript-related handling functions.

Public Methods

Hide inherited methods

MethodDescriptionDefined By
encode() Encodes a PHP variable into javascript representation. CJavaScript
jsonDecode() Decodes a JSON string. CJavaScript
jsonEncode() Returns the JSON representation of the PHP data. CJavaScript
quote() Quotes a javascript string. CJavaScript

Method Details

encode() method
public static string encode(mixed $value)
$value mixed PHP variable to be encoded
{return} string the encoded string
Source Code: framework/web/helpers/CJavaScript.php#54 (show)
public static function encode($value)
{
    if(is_string($value))
    {
        if(strpos($value,'js:')===0)
            return substr($value,3);
        else
            return "'".self::quote($value)."'";
    }
    else if($value===null)
        return 'null';
    else if(is_bool($value))
        return $value?'true':'false';
    else if(is_integer($value))
        return "$value";
    else if(is_float($value))
    {
        if($value===-INF)
            return 'Number.NEGATIVE_INFINITY';
        else if($value===INF)
            return 'Number.POSITIVE_INFINITY';
        else
            return "$value";
    }
    else if(is_object($value))
        return self::encode(get_object_vars($value));
    else if(is_array($value))
    {
        $es=array();
        if(($n=count($value))>0 && array_keys($value)!==range(0,$n-1))
        {
            foreach($value as $k=>$v)
                $es[]="'".self::quote($k)."':".self::encode($v);
            return '{'.implode(',',$es).'}';
        }
        else
        {
            foreach($value as $v)
                $es[]=self::encode($v);
            return '['.implode(',',$es).']';
        }
    }
    else
        return '';
}

Encodes a PHP variable into javascript representation.

Example: 

$options=array('key1'=>true,'key2'=>123,'key3'=>'value');
echo CJavaScript::encode($options);
// The following javascript code would be generated:
// {'key1':true,'key2':123,'key3':'value'}


For highly complex data structures use jsonEncode and jsonDecode to serialize and unserialize.
jsonDecode() method
public static mixed jsonDecode(string $data, boolean $useArray=true)
$data string the data to be decoded
$useArray boolean whether to use associative array to represent object data
{return} mixed the decoded PHP data
Source Code: framework/web/helpers/CJavaScript.php#121 (show)
public static function jsonDecode($data,$useArray=true)
{
    if(function_exists('json_decode'))
        return json_decode($data,$useArray);
    else
        return CJSON::decode($data,$useArray);
}

Decodes a JSON string.

jsonEncode() method
public static string jsonEncode(mixed $data)
$data mixed the data to be encoded
{return} string the JSON representation of the PHP data.
Source Code: framework/web/helpers/CJavaScript.php#105 (show)
public static function jsonEncode($data)
{
    if(function_exists('json_encode'))
        return json_encode($data);
    else
    {
        return CJSON::encode($data);
    }
}

Returns the JSON representation of the PHP data.

quote() method
public static string quote(string $js, boolean $forUrl=false)
$js string string to be quoted
$forUrl boolean whether this string is used as a URL
{return} string the quoted string
Source Code: framework/web/helpers/CJavaScript.php#29 (show)
public static function quote($js,$forUrl=false)
{
    if($forUrl)
        return strtr($js,array('%'=>'%25',"\t"=>'\t',"\n"=>'\n',"\r"=>'\r','"'=>'\"','\''=>'\\\'','\\'=>'\\\\','</'=>'<\/'));
    else
        return strtr($js,array("\t"=>'\t',"\n"=>'\n',"\r"=>'\r','"'=>'\"','\''=>'\\\'','\\'=>'\\\\','</'=>'<\/'));
}

Quotes a javascript string. After processing, the string can be safely enclosed within a pair of quotation marks and serve as a javascript string.