* Copyright 2005-2007, Cake Software Foundation, Inc.
* 1785 E. Sahara Avenue, Suite 490-204
* Las Vegas, Nevada 89104
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @filesource
* @copyright Copyright 2005-2007, Cake Software Foundation, Inc.
* @link http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
* @package cake
* @subpackage cake.cake.libs.view.helpers
* @since CakePHP(tm) v 0.10.0.1076
* @version $Revision$
* @modifiedby $LastChangedBy$
* @lastmodified $Date$
* @license http://www.opensource.org/licenses/mit-license.php The MIT License
*/
/**
* Javascript Helper class for easy use of JavaScript.
*
* JavascriptHelper encloses all methods needed while working with JavaScript.
*
* @package cake
* @subpackage cake.cake.libs.view.helpers
*/
class JavascriptHelper extends AppHelper {
var $__scriptBuffer = null;
var $_cachedEvents = array();
var $_cacheEvents = false;
var $_cacheToFile = false;
var $_cacheAll = false;
var $_rules = array();
var $enabled = true;
var $safe = false;
/**
* html tags used by this helper.
*
* @var array
*/
var $tags = array(
'javascriptblock' => '',
'javascriptstart' => '',
'javascriptend' => '',
);
/**
* Returns a JavaScript script tag.
*
* @param string $script The JavaScript to be wrapped in SCRIPT tags.
* @param boolean $allowCache Allows the script to be cached if non-event caching is active
* @param boolean $safe Wraps the script in an HTML comment and a CDATA block
* @return string The full SCRIPT element, with the JavaScript inside it.
*/
function codeBlock($script = null, $allowCache = true, $safe = false) {
if ($this->_cacheEvents && $this->_cacheAll && $allowCache && $script !== null) {
$this->_cachedEvents[] = $script;
} else {
$block = ($script !== null);
if (($safe || $this->safe) && !($this->_cacheAll && $allowCache)) {
$script = "\n" . '' . "\n";
}
}
if ($script === null && $this->_cacheAll && $allowCache) {
$this->__scriptBuffer = @ob_get_contents();
@ob_end_clean();
ob_start();
return null;
}
if ($block) {
return sprintf($this->tags['javascriptblock'], $script);
} else {
return sprintf($this->tags['javascriptstart'], $script);
}
}
}
/**
* Ends a block of cached JavaScript code
*
* @return mixed
*/
function blockEnd() {
$script = @ob_get_contents();
@ob_end_clean();
ob_start();
echo $this->__scriptBuffer;
$this->__scriptBuffer = null;
if (!empty($script)) {
$this->_cachedEvents[] = $script;
}
return $this->tags['javascriptend'];
}
/**
* Returns a JavaScript include tag (SCRIPT element)
*
* @param mixed $url String URL to JavaScript file, or an array of URLs.
* @param boolean $inline If true, the tag will be printed inline,
* otherwise it will be printed in the
* @return string
*/
function link($url, $inline = true) {
if (is_array($url)) {
$out = '';
foreach ($url as $i) {
$out .= "\n\t" . $this->link($i, $inline);
}
if ($inline) {
return $out . "\n";
}
return;
}
if (strpos($url, '.js') === false && strpos($url, '?') === false) {
$url .= '.js';
}
if (strpos($url, '://') === false) {
$url = $this->webroot(JS_URL . $url);
}
$out = $this->output(sprintf($this->tags['javascriptlink'], $url));
if ($inline) {
return $out;
} else {
$view =& ClassRegistry::getObject('view');
$view->addScript($out);
}
}
/**
* Escape carriage returns and single and double quotes for JavaScript segments.
*
* @param string $script string that might have javascript elements
* @return string escaped string
*/
function escapeScript($script) {
$script = r(array("\r\n", "\n", "\r"), '\n', $script);
$script = r(array('"', "'"), array('\"', "\\'"), $script);
return $script;
}
/**
* Escape a string to be JavaScript friendly.
*
* List of escaped ellements:
* + "\r\n" => '\n'
* + "\r" => '\n'
* + "\n" => '\n'
* + '"' => '\"'
* + "'" => "\\'"
*
* @param string $script String that needs to get escaped.
* @return string Escaped string.
*/
function escapeString($string) {
$escape = array("\r\n" => '\n', "\r" => '\n', "\n" => '\n', '"' => '\"', "'" => "\\'");
return r(array_keys($escape), array_values($escape), $string);
}
/**
* Attach an event to an element. Used with the Prototype library.
*
* @param string $object Object to be observed
* @param string $event event to observe
* @param string $observer function to call
* @param boolean $useCapture default true
* @return boolean true on success
*/
function event($object, $event, $observer = null, $useCapture = false) {
if ($useCapture == true) {
$useCapture = 'true';
} else {
$useCapture = 'false';
}
if (strpos($object, 'window') !== false || strpos($object, 'document') !== false || strpos($object, '$(') !== false || strpos($object, '"') !== false || strpos($object, '\'') !== false) {
$b = "Event.observe({$object}, '{$event}', function(event){ {$observer} }, {$useCapture});";
} elseif (strpos($object, '\'') === 0) {
$b = "Event.observe(" . substr($object, 1) . ", '{$event}', function(event){ {$observer} }, {$useCapture});";
} else {
$chars = array('#', ' ', ', ', '.', ':');
$found = false;
foreach ($chars as $char) {
if (strpos($object, $char) !== false) {
$found = true;
break;
}
}
if ($found) {
$this->_rules[$object] = $event;
} else {
$b = "Event.observe(\$('{$object}'), '{$event}', function(event){ {$observer} }, {$useCapture});";
}
}
if (isset($b) && !empty($b)) {
if ($this->_cacheEvents === true) {
$this->_cachedEvents[] = $b;
return;
} else {
return $this->codeBlock($b);
}
}
}
/**
* Cache JavaScript events created with event()
*
* @param boolean $file If true, code will be written to a file
* @param boolean $all If true, all code written with JavascriptHelper will be sent to a file
* @return null
*/
function cacheEvents($file = false, $all = false) {
$this->_cacheEvents = true;
$this->_cacheToFile = $file;
$this->_cacheAll = $all;
}
/**
* Gets (and clears) the current JavaScript event cache
*
* @param boolean $clear
* @return string
*/
function getCache($clear = true) {
$out = '';
$rules = array();
if (!empty($this->_rules)) {
foreach ($this->_rules as $sel => $event) {
$rules[] = "\t'{$sel}': function(element, event) {\n\t\t{$event}\n\t}";
}
}
$data = implode("\n", $this->_cachedEvents);
if (!empty($rules)) {
$data .= "\nvar Rules = {\n" . implode(",\n\n", $rules) . "\n}";
$data .= "\nEventSelectors.start(Rules);\n";
}
if ($clear) {
$this->_rules = array();
$this->_cacheEvents = false;
$this->_cachedEvents = array();
}
return $data;
}
/**
* Write cached JavaScript events
*
* @param boolean $inline If true, returns JavaScript event code. Otherwise it is added to the
* output of $scripts_for_layout in the layout.
* @return string
*/
function writeEvents($inline = true) {
$out = '';
$rules = array();
if ($this->_cacheEvents) {
$data = $this->getCache();
if (!empty($data)) {
if ($this->_cacheToFile) {
$filename = md5($data);
if (!file_exists(JS . $filename . '.js')) {
cache(r(WWW_ROOT, '', JS) . $filename . '.js', $data, '+999 days', 'public');
}
$out = $this->link($filename);
} else {
$out = $this->codeBlock("\n" . $data . "\n", false);
}
if ($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.
* @return string script with all javascript in/javascripts folder
*/
function includeScript($script = "") {
if ($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);
}
/**
* Generates a JavaScript object in JavaScript Object Notation (JSON)
* from an array
*
* @param array $data Data to be converted
* @param boolean $block Wraps return value in a