<?php
/* SVN FILE: $Id$ */
/**
* Javascript Helper class file.
*
* PHP versions 4 and 5
*
* CakePHP : Rapid Development Framework <http://www.cakephp.org/>
* Copyright (c) 2006, 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 (c) 2006, Cake Software Foundation, Inc.
* @link http://www.cakefoundation.org/projects/info/cakephp CakePHP Project
* @package cake
* @subpackage cake.cake.libs.view.helpers
* @since CakePHP 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 Helper{
var $_cachedEvents = array();
var $_cacheEvents = false;
var $_cacheToFile = false;
var $_cacheAll = false;
var $_rules = array();
var $safe = false;
/**
* 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) {
$script = "\n" . '<!--//--><![CDATA[//><!--' . "\n" . $script;
if ($block) {
$script .= "\n" . '//--><!]]>' . "\n";
}
}
if ($block) {
return sprintf($this->tags['javascriptblock'], $script);
} else {
return sprintf($this->tags['javascriptstart'], $script);
}
}
}
/**
* Returns a JavaScript include tag (SCRIPT element)
*
* @param string $url URL to JavaScript file.
* @return string
*/
function link($url) {
if (strpos($url, '.') === false && strpos($url, '?') === false) {
$url .= '.js';
}
if (strpos($url, '://') === false) {
$url = $this->webroot . $this->themeWeb . JS_URL . $url;
}
return sprintf($this->tags['javascriptlink'], $url);
}
/**
* Returns a JavaScript include tag for an externally-hosted script
*
* @param string $url URL to JavaScript file.
* @return string
* @deprecated As of 1.2, use JavascriptHelper::link()
*/
function linkOut($url) {
if (strpos($url, ".") === false) {
$url .= ".js";
}
return sprintf($this->tags['javascriptlink'], $url);
}
/**
* 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;
}
/**
* Write cached JavaScript events
*
* @return string
*/
function writeEvents() {
$rules = array();
if (!empty($this->_rules)) {
foreach ($this->_rules as $sel => $event) {
$rules[] = "\t'{$sel}': function(element, event) {\n\t\t{$event}\n\t}";
}
$this->_cacheEvents = true;
}
if ($this->_cacheEvents) {
$this->_cacheEvents = false;
$events = $this->_cachedEvents;
$data = implode("\n", $events);
$this->_cachedEvents = array();
if (!empty($rules)) {
$data .= "\nEventSelectors.start({\n" . implode(",\n\n", $rules) . "\n});\n";
}
if (!empty($events) || !empty($rules)) {
if ($this->_cacheToFile) {
$filename = md5($data);
if (!file_exists(JS . $filename . '.js')) {
cache(r(WWW_ROOT, '', JS) . $filename . '.js', $data, '+999 days', 'public');
}
return $this->link($filename);
} else {
return $this->codeBlock("\n" . $data . "\n");
}
}
}
}
/**
* Includes the Prototype Javascript library (and anything else) inside a single script tag.
*
* Note: The recommended approach is to copy the contents of
* javascripts into your application's
* public/javascripts/ directory, and use @see javascriptIncludeTag() to
* create remote script links.
* @return string script with all javascript in/javascripts folder
*/
function includeScript($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 <script/> block if true
* @param string $prefix Prepends the string to the returned data
* @param string $postfix Appends the string to the returned data
* @param array $stringKeys A list of array keys to be treated as a string
* @param boolean $quoteKeys If false, treats $stringKey as a list of keys *not* to be quoted
* @param string $q The type of quote to use
* @return string A JSON code block
*/
function object($data = array(), $block = false, $prefix = '', $postfix = '', $stringKeys = array(), $quoteKeys = true, $q = "\"") {
if (is_object($data)) {
$data = get_object_vars($data);
}
$out = array();
$key = array();
if (is_array($data)) {
$keys = array_keys($data);
}
$numeric = true;
if (!empty($keys)) {
foreach($keys as $key) {
if (!is_numeric($key)) {
$numeric = false;
break;
}
}
}
foreach($data as $key => $val) {
if (is_array($val) || is_object($val)) {
$val = $this->object($val, false, '', '', $stringKeys, $quoteKeys, $q);
} else {
if ((!count($stringKeys) && !is_numeric($val) && !is_bool($val)) || ($quoteKeys && in_array($key, $stringKeys)) || (!$quoteKeys && !in_array($key, $stringKeys))) {
$val = $q . $this->escapeString($val) . $q;
}
if (trim($val) == '') {
$val = 'null';
}
}
if (!$numeric) {
$val = $key . ':' . $val;
}
$out[] = $val;
}
if (!$numeric) {
$rt = '{' . join(', ', $out) . '}';
} else {
$rt = '[' . join(', ', $out) . ']';
}
$rt = $prefix . $rt . $postfix;
if ($block) {
$rt = $this->codeBlock($rt);
}
return $rt;
}
/**
* AfterRender callback. Writes any cached events to the view, or to a temp file.
*
* @return null
*/
function afterRender() {
echo $this->writeEvents();
}
}
?>