/**
 * @class Ext.Element
 */
Ext.Element.addMethods({    
    
/**
     * Stops the specified event(s) from bubbling and optionally prevents the default action
     * @param {String/Array} eventName an event / array of events to stop from bubbling
     * @param {Boolean} preventDefault (optional) true to prevent the default action too
     * @return {Ext.Element} this
     */
    swallowEvent : function(eventName, preventDefault){
	    var me = this;
        function fn(e){
            e.stopPropagation();
            if(preventDefault){
                e.preventDefault();
            }
        }
        if(Ext.isArray(eventName)){            
	        Ext.each(eventName, function(e) {
                 me.on(e, fn);
            });
            return me;
        }
        me.on(eventName, fn);
        return me;
    },
    
    
/**
     * Create an event handler on this element such that when the event fires and is handled by this element,
     * it will be relayed to another object (i.e., fired again as if it originated from that object instead).
     * @param {String} eventName The type of event to relay
     * @param {Object} object Any object that extends {@link Ext.util.Observable} that will provide the context
     * for firing the relayed event
     */
    relayEvent : function(eventName, observable){
        this.on(eventName, function(e){
            observable.fireEvent(eventName, e);
        });
    },
    
	
/**
     * Removes worthless text nodes
     * @param {Boolean} forceReclean (optional) By default the element
     * keeps track if it has been cleaned already so
     * you can call this over and over. However, if you update the element and
     * need to force a reclean, you can pass true.
     */
    clean : function(forceReclean){
        var me = this, 
            dom = me.dom,
        	n = dom.firstChild, 
        	ni = -1;
        	
	    if(Ext.Element.data(dom, 'isCleaned') && forceReclean !== true){
            return me;
        }      
        	
 	    while(n){
 	        var nx = n.nextSibling;
            if(n.nodeType == 3 && !/\S/.test(n.nodeValue)){
                dom.removeChild(n);
            }else{
                n.nodeIndex = ++ni;
            }
 	        n = nx;
 	    }
        Ext.Element.data(dom, 'isCleaned', true);
 	    return me;
 	},
    
    
/**
     * Direct access to the Updater {@link Ext.Updater#update} method. The method takes the same object
     * parameter as {@link Ext.Updater#update}
     * @return {Ext.Element} this
     */
    load : function(){
        var um = this.getUpdater();
        um.update.apply(um, arguments);
        return this;
    },

    
/**
    * Gets this element's {@link Ext.Updater Updater}
    * @return {Ext.Updater} The Updater
    */
    getUpdater : function(){
        return this.updateManager || (this.updateManager = new Ext.Updater(this));
    },
    
	
/**
    * Update the innerHTML of this element, optionally searching for and processing scripts
    * @param {String} html The new HTML
    * @param {Boolean} loadScripts (optional) True to look for and process scripts (defaults to false)
    * @param {Function} callback (optional) For async script loading you can be notified when the update completes
    * @return {Ext.Element} this
     */
    update : function(html, loadScripts, callback){
        html = html || "";
	    
        if(loadScripts !== true){
            this.dom.innerHTML = html;
            if(Ext.isFunction(callback)){
                callback();
            }
            return this;
        }
        
        var id = Ext.id(),
        	dom = this.dom;

        html += '';

        Ext.lib.Event.onAvailable(id, function(){
            var DOC = document,
                hd = DOC.getElementsByTagName("head")[0],
            	re = /(?:]*)?>)((\n|\r|.)*?)(?:<\/script>)/ig,
            	srcRe = /\ssrc=([\'\"])(.*?)\1/i,
            	typeRe = /\stype=([\'\"])(.*?)\1/i,
            	match,
            	attrs,
            	srcMatch,
            	typeMatch,
            	el,
            	s;

            while((match = re.exec(html))){
                attrs = match[1];
                srcMatch = attrs ? attrs.match(srcRe) : false;
                if(srcMatch && srcMatch[2]){
                   s = DOC.createElement("script");
                   s.src = srcMatch[2];
                   typeMatch = attrs.match(typeRe);
                   if(typeMatch && typeMatch[2]){
                       s.type = typeMatch[2];
                   }
                   hd.appendChild(s);
                }else if(match[2] && match[2].length > 0){
                    if(window.execScript) {
                       window.execScript(match[2]);
                    } else {
                       window.eval(match[2]);
                    }
                }
            }
            el = DOC.getElementById(id);
            if(el){Ext.removeNode(el);}
            if(Ext.isFunction(callback)){
                callback();
            }
        });
        dom.innerHTML = html.replace(/(?:)((\n|\r|.)*?)(?:<\/script>)/ig, "");
        return this;
    },
    
    
/**
     * Creates a proxy element of this element
     * @param {String/Object} config The class name of the proxy element or a DomHelper config object
     * @param {String/HTMLElement} renderTo (optional) The element or element id to render the proxy to (defaults to document.body)
     * @param {Boolean} matchBox (optional) True to align and size the proxy to this element now (defaults to false)
     * @return {Ext.Element} The new proxy element
     */
    createProxy : function(config, renderTo, matchBox){
        config = Ext.isObject(config) ? config : {tag : "div", cls: config};

        var me = this,
        	proxy = renderTo ? Ext.DomHelper.append(renderTo, config, true) :
        					   Ext.DomHelper.insertBefore(me.dom, config, true);        
        
        if(matchBox && me.setBox && me.getBox){ // check to make sure Element.position.js is loaded
           proxy.setBox(me.getBox());
        }
        return proxy;
    }
});

Ext.Element.prototype.getUpdateManager = Ext.Element.prototype.getUpdater;

// private
Ext.Element.uncache = function(el){
    for(var i = 0, a = arguments, len = a.length; i < len; i++) {
        if(a[i]){
            delete Ext.Element.cache[a[i].id || a[i]];
        }
    }
};