contentpane.js

这是一个ajax的例子大家好好的看看就是一个鱼眼的效果

	//		replace keyword '_container_' in scripts with 'dijit.byId(this.id)'
	// NOTE this name might change in the near future
	scriptHasHooks: false,

	/*======
	// ioMethod: dojo.xhrGet|dojo.xhrPost
	//		reference to the method that should grab the content
	ioMethod: dojo.xhrGet,
	
	// ioArgs: Object
	//		makes it possible to add custom args to xhrGet, like ioArgs.headers['X-myHeader'] = 'true'
	ioArgs: {},

	// onLoadDeferred: dojo.Deferred
	//		callbackchain will start when onLoad occurs
	onLoadDeferred: new dojo.Deferred(),

	// onUnloadDeferred: dojo.Deferred
	//		callbackchain will start when onUnload occurs
	onUnloadDeferred: new dojo.Deferred(),

	setHref: function(url){
		// summary: replace current content with url's content
		return ;// dojox.layout.ContentPane.DeferredHandle
	},

	refresh: function(){
		summary: force a re-download of content
		return ;// dojox.layout.ContentPane.DeferredHandle 
	},

	======*/

	constructor: function(){
		// init per instance properties, initializer doesn't work here because how things is hooked up in dijit._Widget
		this.ioArgs = {};
		this.ioMethod = dojo.xhrGet;
		this.onLoadDeferred = new dojo.Deferred();
		this.onUnloadDeferred = new dojo.Deferred();
	},

	postCreate: function(){
		// override to support loadDeferred
		this._setUpDeferreds();

		dijit.layout.ContentPane.prototype.postCreate.apply(this, arguments);
	},

	onExecError: function(e){
		// summary
		//		event callback, called on script error or on java handler error
		//		overide and return your own html string if you want a some text 
		//		displayed within the ContentPane
	},

	setContent: function(data){
		// summary: set data as new content, sort of like innerHTML
		// data: String|DomNode|NodeList|dojo.NodeList
		if(!this._isDownloaded){
			var defObj = this._setUpDeferreds();
		}

		dijit.layout.ContentPane.prototype.setContent.apply(this, arguments);
		return defObj; // dojox.layout.ContentPane.DeferredHandle
	},

	cancel: function(){
		// summary: cancels a inflight download
		if(this._xhrDfd && this._xhrDfd.fired == -1){
			// we are still in flight, which means we should reset our DeferredHandle
			// otherwise we will trigger onUnLoad chain of the canceled content,
			// the canceled content have never gotten onLoad so it shouldn't get onUnload
			this.onUnloadDeferred = null;
		}
		dijit.layout.ContentPane.prototype.cancel.apply(this, arguments);
	},

	_setUpDeferreds: function(){
		var _t = this, cancel = function(){ _t.cancel();	}
		var onLoad = (_t.onLoadDeferred = new dojo.Deferred());
		var onUnload = (_t._nextUnloadDeferred = new dojo.Deferred());
		return {
			cancel: cancel,
			addOnLoad: function(func){onLoad.addCallback(func);},
			addOnUnload: function(func){onUnload.addCallback(func);}
		};
	},

	_onLoadHandler: function(){
		dijit.layout.ContentPane.prototype._onLoadHandler.apply(this, arguments);
		if(this.onLoadDeferred){
			this.onLoadDeferred.callback(true);
		}
	},

	_onUnloadHandler: function(){
		this.isLoaded = false;
		this.cancel();// need to cancel so we don't get any inflight suprises
		if(this.onUnloadDeferred){
			this.onUnloadDeferred.callback(true);
		}

		dijit.layout.ContentPane.prototype._onUnloadHandler.apply(this, arguments);

		if(this._nextUnloadDeferred){
			this.onUnloadDeferred = this._nextUnloadDeferred;
		}
	},

	_onError: function(type, err){
		dijit.layout.ContentPane.prototype._onError.apply(this, arguments);
		if(this.onLoadDeferred){
			this.onLoadDeferred.errback(err);
		}
	},

	_prepareLoad: function(forceLoad){
		// sets up for a xhrLoad, load is deferred until widget is showing
		var defObj = this._setUpDeferreds();

		dijit.layout.ContentPane.prototype._prepareLoad.apply(this, arguments);

		return defObj;
	},

	_setContent: function(cont){
		// override dijit.layout.ContentPane._setContent, to enable path adjustments
		var styles = [];// init vars
		if(dojo.isString(cont)){
			if(this.adjustPaths && this.href){
				cont = adjustHtmlPaths(this.href, cont);
			}
			if(this.cleanContent){
				cont = secureForInnerHtml(cont);
			}
			if(this.renderStyles || this.cleanContent){
				cont = snarfStyles(this.href, cont, styles);
			}

			// because of a bug in IE, script tags that is first in html hierarchy doesnt make it into the DOM 
			//	when content is innerHTML'ed, so we can't use dojo.query to retrieve scripts from DOM
			if(this.executeScripts){
				var _t = this, code, byRef = {
					downloadRemote: true,
					errBack:function(e){
						_t._onError.call(_t, 'Exec', 'Error downloading remote script in "'+_t.id+'"', e);
					}
				};
				cont = snarfScripts(cont, byRef);
				code = byRef.code;
			}

			// rationale for this block:
			// if containerNode/domNode is a table derivate tag, some browsers dont allow innerHTML on those
			var node = (this.containerNode || this.domNode), pre = post = '', walk = 0;
			switch(node.nodeName.toLowerCase()){
				case 'tr':
					pre = '<tr>'; post = '</tr>';
					walk += 1;//fallthrough
				case 'tbody': case 'thead':// children of THEAD is of same type as TBODY
					pre = '<tbody>' + pre; post += '</tbody>';
					walk += 1;// falltrough
				case 'table':
					pre = '<table>' + pre; post += '</table>';
					walk += 1;
					break;
			}
			if(walk){
				var n = node.ownerDocument.createElement('div');
				n.innerHTML = pre + cont + post;
				do{
					n = n.firstChild;
				}while(--walk);
				cont = n.childNodes;
			}
		}

		// render the content
		dijit.layout.ContentPane.prototype._setContent.call(this, cont);

		// clear old stylenodes from the DOM
		if(this._styleNodes && this._styleNodes.length){
			while(this._styleNodes.length){
				dojo._destroyElement(this._styleNodes.pop());
			}
		}
		// render new style nodes
		if(this.renderStyles && styles && styles.length){
			this._renderStyles(styles);
		}

		if(this.executeScripts && code){
			if(this.cleanContent){
				// clean JS from html comments and other crap that browser
				// parser takes care of in a normal page load
				code = code.replace(/(<!--|(?:\/\/)?-->|<!\[CDATA\[|\]\]>)/g, '');
			}
			if(this.scriptHasHooks){
				// replace _container_ with dijit.byId(this.id)
				code = code.replace(/_container_(?!\s*=[^=])/g, dijit._scopeName + ".byId('"+this.id+"')");
			}
			try{
				evalInGlobal(code, (this.containerNode || this.domNode));
			}catch(e){
				this._onError('Exec', 'Error eval script in '+this.id+', '+e.message, e);
			}
		}
	},

	_renderStyles: function(styles){
		// insert css from content into document head
		this._styleNodes = [];
		var st, att, cssText, doc = this.domNode.ownerDocument;
		var head = doc.getElementsByTagName('head')[0];

		for(var i = 0, e = styles.length; i < e; i++){
			cssText = styles[i]; att = styles.attributes[i];
			st = doc.createElement('style');
			st.setAttribute("type", "text/css"); // this is required in CSS spec!

			for(var x in att){
				st.setAttribute(x, att[x])
			}
			
			this._styleNodes.push(st);
			head.appendChild(st); // must insert into DOM before setting cssText

			if(st.styleSheet){ // IE
				st.styleSheet.cssText = cssText;
			}else{ // w3c
				st.appendChild(doc.createTextNode(cssText));
			}
		}
	}
});

})();

}