721 lines
19 KiB
PHP
721 lines
19 KiB
PHP
<?php
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/**
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* Javascript Helper class file.
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*
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* PHP versions 4 and 5
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*
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* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
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* Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
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*
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* Licensed under The MIT License
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
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* @link http://cakephp.org CakePHP(tm) Project
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* @package cake
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* @subpackage cake.cake.libs.view.helpers
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* @since CakePHP(tm) v 0.10.0.1076
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* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
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*/
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/**
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* Javascript Helper class for easy use of JavaScript.
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*
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* JavascriptHelper encloses all methods needed while working with JavaScript.
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*
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* @package cake
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* @subpackage cake.cake.libs.view.helpers
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* @link http://book.cakephp.org/view/1450/Javascript
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*/
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class JavascriptHelper extends AppHelper {
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/**
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* Determines whether native JSON extension is used for encoding. Set by object constructor.
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*
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* @var boolean
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* @access public
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*/
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var $useNative = false;
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/**
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* If true, automatically writes events to the end of a script or to an external JavaScript file
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* at the end of page execution
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*
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* @var boolean
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* @access public
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*/
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var $enabled = true;
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/**
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* Indicates whether <script /> blocks should be written 'safely,' i.e. wrapped in CDATA blocks
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*
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* @var boolean
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* @access public
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*/
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var $safe = false;
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/**
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* HTML tags used by this helper.
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*
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* @var array
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* @access public
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*/
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var $tags = array(
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'javascriptstart' => '<script type="text/javascript">',
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'javascriptend' => '</script>',
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'javascriptblock' => '<script type="text/javascript">%s</script>',
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'javascriptlink' => '<script type="text/javascript" src="%s"></script>'
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);
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/**
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* Holds options passed to codeBlock(), saved for when block is dumped to output
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*
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* @var array
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* @access protected
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* @see JavascriptHelper::codeBlock()
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*/
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var $_blockOptions = array();
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/**
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* Caches events written by event() for output at the end of page execution
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*
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* @var array
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* @access protected
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* @see JavascriptHelper::event()
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*/
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var $_cachedEvents = array();
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/**
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* Indicates whether generated events should be cached for later output (can be written at the
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* end of the page, in the <head />, or to an external file).
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*
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* @var boolean
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* @access protected
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* @see JavascriptHelper::event()
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* @see JavascriptHelper::writeEvents()
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*/
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var $_cacheEvents = false;
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/**
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* Indicates whether cached events should be written to an external file
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*
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* @var boolean
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* @access protected
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* @see JavascriptHelper::event()
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* @see JavascriptHelper::writeEvents()
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*/
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var $_cacheToFile = false;
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/**
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* Indicates whether *all* generated JavaScript should be cached for later output
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*
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* @var boolean
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* @access protected
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* @see JavascriptHelper::codeBlock()
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* @see JavascriptHelper::blockEnd()
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*/
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var $_cacheAll = false;
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/**
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* Contains event rules attached with CSS selectors. Used with the event:Selectors JavaScript
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* library.
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*
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* @var array
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* @access protected
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* @see JavascriptHelper::event()
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* @link http://alternateidea.com/event-selectors/
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*/
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var $_rules = array();
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/**
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* @var string
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* @access private
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*/
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var $__scriptBuffer = null;
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/**
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* Constructor. Checks for presence of native PHP JSON extension to use for object encoding
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*
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* @access public
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*/
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function __construct($options = array()) {
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if (!empty($options)) {
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foreach ($options as $key => $val) {
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if (is_numeric($key)) {
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$key = $val;
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$val = true;
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}
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switch ($key) {
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case 'cache':
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break;
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case 'safe':
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$this->safe = $val;
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break;
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}
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}
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}
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$this->useNative = function_exists('json_encode');
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return parent::__construct($options);
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}
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/**
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* Returns a JavaScript script tag.
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*
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* Options:
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*
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* - allowCache: boolean, designates whether this block is cacheable using the
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* current cache settings.
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* - safe: boolean, whether this block should be wrapped in CDATA tags. Defaults
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* to helper's object configuration.
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* - inline: whether the block should be printed inline, or written
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* to cached for later output (i.e. $scripts_for_layout).
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*
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* @param string $script The JavaScript to be wrapped in SCRIPT tags.
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* @param array $options Set of options:
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* @return string The full SCRIPT element, with the JavaScript inside it, or null,
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* if 'inline' is set to false.
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*/
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function codeBlock($script = null, $options = array()) {
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if (!empty($options) && !is_array($options)) {
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$options = array('allowCache' => $options);
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} elseif (empty($options)) {
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$options = array();
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}
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$defaultOptions = array('allowCache' => true, 'safe' => true, 'inline' => true);
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$options = array_merge($defaultOptions, $options);
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if (empty($script)) {
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$this->__scriptBuffer = @ob_get_contents();
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$this->_blockOptions = $options;
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$this->inBlock = true;
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@ob_end_clean();
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ob_start();
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return null;
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}
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if ($this->_cacheEvents && $this->_cacheAll && $options['allowCache']) {
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$this->_cachedEvents[] = $script;
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return null;
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}
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if ($options['safe'] || $this->safe) {
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$script = "\n" . '//<![CDATA[' . "\n" . $script . "\n" . '//]]>' . "\n";
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}
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if ($options['inline']) {
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return sprintf($this->tags['javascriptblock'], $script);
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} else {
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$view =& ClassRegistry::getObject('view');
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$view->addScript(sprintf($this->tags['javascriptblock'], $script));
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}
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}
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/**
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* Ends a block of cached JavaScript code
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*
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* @return mixed
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*/
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function blockEnd() {
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if (!isset($this->inBlock) || !$this->inBlock) {
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return;
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}
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$script = @ob_get_contents();
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@ob_end_clean();
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ob_start();
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echo $this->__scriptBuffer;
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$this->__scriptBuffer = null;
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$options = $this->_blockOptions;
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$this->_blockOptions = array();
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$this->inBlock = false;
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if (empty($script)) {
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return null;
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}
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return $this->codeBlock($script, $options);
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}
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/**
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* Returns a JavaScript include tag (SCRIPT element). If the filename is prefixed with "/",
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* the path will be relative to the base path of your application. Otherwise, the path will
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* be relative to your JavaScript path, usually webroot/js.
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*
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* @param mixed $url String URL to JavaScript file, or an array of URLs.
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* @param boolean $inline If true, the <script /> tag will be printed inline,
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* otherwise it will be printed in the <head />, using $scripts_for_layout
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* @see JS_URL
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* @return string
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*/
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function link($url, $inline = true) {
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if (is_array($url)) {
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$out = '';
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foreach ($url as $i) {
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$out .= "\n\t" . $this->link($i, $inline);
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}
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if ($inline) {
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return $out . "\n";
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}
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return;
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}
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if (strpos($url, '://') === false) {
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if ($url[0] !== '/') {
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$url = JS_URL . $url;
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}
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if (strpos($url, '?') === false) {
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if (substr($url, -3) !== '.js') {
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$url .= '.js';
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}
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}
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$url = $this->assetTimestamp($this->webroot($url));
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if (Configure::read('Asset.filter.js')) {
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$pos = strpos($url, JS_URL);
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if ($pos !== false) {
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$url = substr($url, 0, $pos) . 'cjs/' . substr($url, $pos + strlen(JS_URL));
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}
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}
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}
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$out = sprintf($this->tags['javascriptlink'], $url);
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if ($inline) {
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return $out;
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} else {
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$view =& ClassRegistry::getObject('view');
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$view->addScript($out);
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}
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}
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/**
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* Escape carriage returns and single and double quotes for JavaScript segments.
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*
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* @param string $script string that might have javascript elements
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* @return string escaped string
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*/
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function escapeScript($script) {
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$script = str_replace(array("\r\n", "\n", "\r"), '\n', $script);
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$script = str_replace(array('"', "'"), array('\"', "\\'"), $script);
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return $script;
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}
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/**
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* Escape a string to be JavaScript friendly.
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*
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* List of escaped ellements:
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* + "\r\n" => '\n'
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* + "\r" => '\n'
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* + "\n" => '\n'
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* + '"' => '\"'
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* + "'" => "\\'"
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*
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* @param string $script String that needs to get escaped.
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* @return string Escaped string.
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*/
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function escapeString($string) {
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App::import('Core', 'Multibyte');
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$escape = array("\r\n" => "\n", "\r" => "\n");
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$string = str_replace(array_keys($escape), array_values($escape), $string);
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return $this->_utf8ToHex($string);
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}
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/**
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* Encode a string into JSON. Converts and escapes necessary characters.
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*
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* @return void
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*/
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function _utf8ToHex($string) {
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$length = strlen($string);
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$return = '';
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for ($i = 0; $i < $length; ++$i) {
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$ord = ord($string{$i});
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switch (true) {
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case $ord == 0x08:
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$return .= '\b';
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break;
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case $ord == 0x09:
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$return .= '\t';
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break;
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case $ord == 0x0A:
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$return .= '\n';
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break;
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case $ord == 0x0C:
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$return .= '\f';
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break;
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case $ord == 0x0D:
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$return .= '\r';
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break;
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case $ord == 0x22:
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case $ord == 0x2F:
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case $ord == 0x5C:
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case $ord == 0x27:
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$return .= '\\' . $string{$i};
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break;
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case (($ord >= 0x20) && ($ord <= 0x7F)):
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$return .= $string{$i};
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break;
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case (($ord & 0xE0) == 0xC0):
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if ($i + 1 >= $length) {
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$i += 1;
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$return .= '?';
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break;
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}
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$charbits = $string{$i} . $string{$i + 1};
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$char = Multibyte::utf8($charbits);
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$return .= sprintf('\u%04s', dechex($char[0]));
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$i += 1;
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break;
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case (($ord & 0xF0) == 0xE0):
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if ($i + 2 >= $length) {
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$i += 2;
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$return .= '?';
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break;
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}
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$charbits = $string{$i} . $string{$i + 1} . $string{$i + 2};
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$char = Multibyte::utf8($charbits);
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$return .= sprintf('\u%04s', dechex($char[0]));
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$i += 2;
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break;
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case (($ord & 0xF8) == 0xF0):
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if ($i + 3 >= $length) {
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$i += 3;
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$return .= '?';
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break;
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}
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$charbits = $string{$i} . $string{$i + 1} . $string{$i + 2} . $string{$i + 3};
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$char = Multibyte::utf8($charbits);
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$return .= sprintf('\u%04s', dechex($char[0]));
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$i += 3;
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break;
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case (($ord & 0xFC) == 0xF8):
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if ($i + 4 >= $length) {
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$i += 4;
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$return .= '?';
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break;
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}
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$charbits = $string{$i} . $string{$i + 1} . $string{$i + 2} . $string{$i + 3} . $string{$i + 4};
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$char = Multibyte::utf8($charbits);
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$return .= sprintf('\u%04s', dechex($char[0]));
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$i += 4;
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break;
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case (($ord & 0xFE) == 0xFC):
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if ($i + 5 >= $length) {
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$i += 5;
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$return .= '?';
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break;
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}
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$charbits = $string{$i} . $string{$i + 1} . $string{$i + 2} . $string{$i + 3} . $string{$i + 4} . $string{$i + 5};
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$char = Multibyte::utf8($charbits);
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$return .= sprintf('\u%04s', dechex($char[0]));
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$i += 5;
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break;
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}
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}
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return $return;
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}
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/**
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* Attach an event to an element. Used with the Prototype library.
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*
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* @param string $object Object to be observed
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* @param string $event event to observe
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* @param string $observer function to call
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* @param array $options Set options: useCapture, allowCache, safe
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* @return boolean true on success
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*/
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function event($object, $event, $observer = null, $options = array()) {
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if (!empty($options) && !is_array($options)) {
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$options = array('useCapture' => $options);
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} else if (empty($options)) {
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$options = array();
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}
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$defaultOptions = array('useCapture' => false);
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$options = array_merge($defaultOptions, $options);
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if ($options['useCapture'] == true) {
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$options['useCapture'] = 'true';
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} else {
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$options['useCapture'] = 'false';
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}
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$isObject = (
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strpos($object, 'window') !== false || strpos($object, 'document') !== false ||
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strpos($object, '$(') !== false || strpos($object, '"') !== false ||
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strpos($object, '\'') !== false
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);
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if ($isObject) {
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$b = "Event.observe({$object}, '{$event}', function(event) { {$observer} }, ";
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$b .= "{$options['useCapture']});";
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} elseif ($object[0] == '\'') {
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$b = "Event.observe(" . substr($object, 1) . ", '{$event}', function(event) { ";
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$b .= "{$observer} }, {$options['useCapture']});";
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} else {
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$chars = array('#', ' ', ', ', '.', ':');
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$found = false;
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foreach ($chars as $char) {
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if (strpos($object, $char) !== false) {
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$found = true;
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break;
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}
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}
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if ($found) {
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$this->_rules[$object] = $event;
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} else {
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$b = "Event.observe(\$('{$object}'), '{$event}', function(event) { ";
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$b .= "{$observer} }, {$options['useCapture']});";
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}
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}
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|
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if (isset($b) && !empty($b)) {
|
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if ($this->_cacheEvents === true) {
|
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$this->_cachedEvents[] = $b;
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return;
|
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} else {
|
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return $this->codeBlock($b, array_diff_key($options, $defaultOptions));
|
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}
|
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}
|
|
}
|
|
|
|
/**
|
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* Cache JavaScript events created with event()
|
|
*
|
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* @param boolean $file If true, code will be written to a file
|
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* @param boolean $all If true, all code written with JavascriptHelper will be sent to a file
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* @return null
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*/
|
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function cacheEvents($file = false, $all = false) {
|
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$this->_cacheEvents = true;
|
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$this->_cacheToFile = $file;
|
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$this->_cacheAll = $all;
|
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}
|
|
|
|
/**
|
|
* Gets (and clears) the current JavaScript event cache
|
|
*
|
|
* @param boolean $clear
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|
* @return string
|
|
*/
|
|
function getCache($clear = true) {
|
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$out = '';
|
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$rules = array();
|
|
|
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if (!empty($this->_rules)) {
|
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foreach ($this->_rules as $sel => $event) {
|
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$rules[] = "\t'{$sel}': function(element, event) {\n\t\t{$event}\n\t}";
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}
|
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}
|
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$data = implode("\n", $this->_cachedEvents);
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|
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if (!empty($rules)) {
|
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$data .= "\nvar Rules = {\n" . implode(",\n\n", $rules) . "\n}";
|
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$data .= "\nEventSelectors.start(Rules);\n";
|
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}
|
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if ($clear) {
|
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$this->_rules = array();
|
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$this->_cacheEvents = false;
|
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$this->_cachedEvents = array();
|
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}
|
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return $data;
|
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}
|
|
|
|
/**
|
|
* Write cached JavaScript events
|
|
*
|
|
* @param boolean $inline If true, returns JavaScript event code. Otherwise it is added to the
|
|
* output of $scripts_for_layout in the layout.
|
|
* @param array $options Set options for codeBlock
|
|
* @return string
|
|
*/
|
|
function writeEvents($inline = true, $options = array()) {
|
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$out = '';
|
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$rules = array();
|
|
|
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if (!$this->_cacheEvents) {
|
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return;
|
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}
|
|
$data = $this->getCache();
|
|
|
|
if (empty($data)) {
|
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return;
|
|
}
|
|
|
|
if ($this->_cacheToFile) {
|
|
$filename = md5($data);
|
|
if (!file_exists(JS . $filename . '.js')) {
|
|
cache(str_replace(WWW_ROOT, '', JS) . $filename . '.js', $data, '+999 days', 'public');
|
|
}
|
|
$out = $this->link($filename);
|
|
} else {
|
|
$out = $this->codeBlock("\n" . $data . "\n", $options);
|
|
}
|
|
|
|
if ($inline) {
|
|
return $out;
|
|
} else {
|
|
$view =& ClassRegistry::getObject('view');
|
|
$view->addScript($out);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Includes the Prototype Javascript library (and anything else) inside a single script tag.
|
|
*
|
|
* Note: The recommended approach is to copy the contents of
|
|
* javascripts into your application's
|
|
* public/javascripts/ directory, and use @see javascriptIncludeTag() to
|
|
* create remote script links.
|
|
*
|
|
* @param string $script Script file to include
|
|
* @param array $options Set options for codeBlock
|
|
* @return string script with all javascript in/javascripts folder
|
|
*/
|
|
function includeScript($script = "", $options = array()) {
|
|
if ($script == "") {
|
|
$files = scandir(JS);
|
|
$javascript = '';
|
|
|
|
foreach ($files as $file) {
|
|
if (substr($file, -3) == '.js') {
|
|
$javascript .= file_get_contents(JS . "{$file}") . "\n\n";
|
|
}
|
|
}
|
|
} else {
|
|
$javascript = file_get_contents(JS . "$script.js") . "\n\n";
|
|
}
|
|
return $this->codeBlock("\n\n" . $javascript, $options);
|
|
}
|
|
|
|
/**
|
|
* Generates a JavaScript object in JavaScript Object Notation (JSON)
|
|
* from an array
|
|
*
|
|
* ### Options
|
|
*
|
|
* - block - Wraps the return value in a script tag if true. Default is false
|
|
* - prefix - Prepends the string to the returned data. Default is ''
|
|
* - postfix - Appends the string to the returned data. Default is ''
|
|
* - stringKeys - A list of array keys to be treated as a string.
|
|
* - quoteKeys - If false treats $stringKeys as a list of keys **not** to be quoted. Default is true.
|
|
* - q - The type of quote to use. Default is '"'. This option only affects the keys, not the values.
|
|
*
|
|
* @param array $data Data to be converted
|
|
* @param array $options Set of options: block, prefix, postfix, stringKeys, quoteKeys, q
|
|
* @return string A JSON code block
|
|
*/
|
|
function object($data = array(), $options = array()) {
|
|
if (!empty($options) && !is_array($options)) {
|
|
$options = array('block' => $options);
|
|
} else if (empty($options)) {
|
|
$options = array();
|
|
}
|
|
|
|
$defaultOptions = array(
|
|
'block' => false, 'prefix' => '', 'postfix' => '',
|
|
'stringKeys' => array(), 'quoteKeys' => true, 'q' => '"'
|
|
);
|
|
$options = array_merge($defaultOptions, $options, array_filter(compact(array_keys($defaultOptions))));
|
|
|
|
if (is_object($data)) {
|
|
$data = get_object_vars($data);
|
|
}
|
|
|
|
$out = $keys = array();
|
|
$numeric = true;
|
|
|
|
if ($this->useNative) {
|
|
$rt = json_encode($data);
|
|
} else {
|
|
if (is_null($data)) {
|
|
return 'null';
|
|
}
|
|
if (is_bool($data)) {
|
|
return $data ? 'true' : 'false';
|
|
}
|
|
|
|
if (is_array($data)) {
|
|
$keys = array_keys($data);
|
|
}
|
|
|
|
if (!empty($keys)) {
|
|
$numeric = (array_values($keys) === array_keys(array_values($keys)));
|
|
}
|
|
|
|
foreach ($data as $key => $val) {
|
|
if (is_array($val) || is_object($val)) {
|
|
$val = $this->object(
|
|
$val,
|
|
array_merge($options, array('block' => false, 'prefix' => '', 'postfix' => ''))
|
|
);
|
|
} else {
|
|
$quoteStrings = (
|
|
!count($options['stringKeys']) ||
|
|
($options['quoteKeys'] && in_array($key, $options['stringKeys'], true)) ||
|
|
(!$options['quoteKeys'] && !in_array($key, $options['stringKeys'], true))
|
|
);
|
|
$val = $this->value($val, $quoteStrings);
|
|
}
|
|
if (!$numeric) {
|
|
$val = $options['q'] . $this->value($key, false) . $options['q'] . ':' . $val;
|
|
}
|
|
$out[] = $val;
|
|
}
|
|
|
|
if (!$numeric) {
|
|
$rt = '{' . implode(',', $out) . '}';
|
|
} else {
|
|
$rt = '[' . implode(',', $out) . ']';
|
|
}
|
|
}
|
|
$rt = $options['prefix'] . $rt . $options['postfix'];
|
|
|
|
if ($options['block']) {
|
|
$rt = $this->codeBlock($rt, array_diff_key($options, $defaultOptions));
|
|
}
|
|
|
|
return $rt;
|
|
}
|
|
|
|
/**
|
|
* Converts a PHP-native variable of any type to a JSON-equivalent representation
|
|
*
|
|
* @param mixed $val A PHP variable to be converted to JSON
|
|
* @param boolean $quoteStrings If false, leaves string values unquoted
|
|
* @return string a JavaScript-safe/JSON representation of $val
|
|
*/
|
|
function value($val, $quoteStrings = true) {
|
|
switch (true) {
|
|
case (is_array($val) || is_object($val)):
|
|
$val = $this->object($val);
|
|
break;
|
|
case ($val === null):
|
|
$val = 'null';
|
|
break;
|
|
case (is_bool($val)):
|
|
$val = !empty($val) ? 'true' : 'false';
|
|
break;
|
|
case (is_int($val)):
|
|
$val = $val;
|
|
break;
|
|
case (is_float($val)):
|
|
$val = sprintf("%.11f", $val);
|
|
break;
|
|
default:
|
|
$val = $this->escapeString($val);
|
|
if ($quoteStrings) {
|
|
$val = '"' . $val . '"';
|
|
}
|
|
break;
|
|
}
|
|
return $val;
|
|
}
|
|
|
|
/**
|
|
* AfterRender callback. Writes any cached events to the view, or to a temp file.
|
|
*
|
|
* @return null
|
|
*/
|
|
function afterRender() {
|
|
if (!$this->enabled) {
|
|
return;
|
|
}
|
|
echo $this->writeEvents(true);
|
|
}
|
|
}
|