xmlstore.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

			console.log("XmlStore._fetchItems(): length=" + (items ? items.length : 0));
			if (items && items.length > 0) {
				fetchHandler(items, request);
			}
			else {
				fetchHandler([], request);
			}
		});
		getHandler.addErrback(function(data){
			errorHandler(data, request);
		});
	},

	_getFetchUrl: function(request){
		//	summary:
		//		Generate a URL for fetch
		//	description:
		//		This default implementation generates a query string in the form of
		//		"?name1=value1&name2=value2..." off properties of 'query' object
		//		specified in 'request' and appends it to 'url', if 'sendQuery'
		//		is set to false.
		//		Otherwise, 'url' is returned as is.
		//		Sub-classes may override this method for the custom URL generation.
		//	request:
		//		A request object
		//	returns:
		//		A fetch URL
		if(!this.sendQuery){
			return this.url;
		}
		var query = request.query;
		if(!query){
			return this.url;
		}
		if(dojo.isString(query)){
			return this.url + query;
		}
		var queryString = "";
		for(var name in query){
			var value = query[name];
			if(value){
				if(queryString){
					queryString += "&";
				}
				queryString += (name + "=" + value);
			}
		}
		if(!queryString){
			return this.url;
		}
		//Check to see if the URL already has query params or not.
		var fullUrl = this.url;
		if(fullUrl.indexOf("?") < 0){
			fullUrl += "?";
		}else{
			fullUrl += "&";
		}
		return fullUrl + queryString;
	},

	_getItems: function(document, request) {
		//	summary:
		//		Fetch items (XML elements) in an XML document based on a request
		//	description:
		//		This default implementation walks through child elements of
		//		the document element to see if all properties of 'query' object
		//		match corresponding attributes of the element (item).
		//		If 'request' is not specified, all child elements are returned.
		//		Sub-classes may override this method for the custom search in
		//		an XML document.
		//	document:
		//		An XML document
		//	request:
		//		A request object
		//	returns:
		//		An array of items
		var query = null;
		if(request){
			query = request.query;
		}
		var items = [];
		var nodes = null;

		console.log("Looking up root item: " + this.rootItem);
		if(this.rootItem !== ""){
			
			nodes = document.getElementsByTagName(this.rootItem);
		}
		else{
			nodes = document.documentElement.childNodes;
		}
		for(var i = 0; i < nodes.length; i++){
			var node = nodes[i];
			if(node.nodeType != 1 /*ELEMENT_NODE*/){
				continue;
			}
            var item = this._getItem(node);
			if(query){
				var found = true;
				var ignoreCase = request.queryOptions ? request.queryOptions.ignoreCase : false; 

				//See if there are any string values that can be regexp parsed first to avoid multiple regexp gens on the
				//same value for each item examined.  Much more efficient.
				var regexpList = {};
				for(var key in query){
					var value = query[key];
					if(typeof value === "string"){
						regexpList[key] = dojo.data.util.filter.patternToRegExp(value, ignoreCase);
					}
				}

				for(var attribute in query){
					var value = this.getValue(item, attribute);
					if(value){
						var queryValue = query[attribute];
						if ((typeof value) === "string" && 
							(regexpList[attribute])){
							if((value.match(regexpList[attribute])) !== null){
								continue;
							}
						}else if((typeof value) === "object"){
							if(	value.toString && 
								(regexpList[attribute])){
								var stringValue = value.toString();
								if((stringValue.match(regexpList[attribute])) !== null){
									continue;
								}
							}else{
								if(queryValue === "*" || queryValue === value){
									continue;
								}
							}
						}
					}
					found = false;
					break;
				}
				if(!found){
					continue;
				}
			}
			items.push(item);
		}
		dojo.forEach(items,function(item){ 
			item.element.parentNode.removeChild(item.element); // make it root
		},this); 
		return items;
	},

	close: function(/*dojo.data.api.Request || keywordArgs || null */ request){
		 //	summary: 
		 //		See dojo.data.api.Read.close()
	},

/* dojo.data.api.Write */

	newItem: function(/* object? */ keywordArgs){
		//	summary:
		//		Return a new dojox.data.XmlItem
		//	description:
		//		At least, 'keywordArgs' must contain "tagName" to be used for
		//		the new	element.
		//		Other attributes in 'keywordArgs' are set to the new element,
		//		including "text()", but excluding "childNodes".
		// 	keywordArgs:
		//		An object containing initial attributes
		//	returns:
		//		An XML element
		console.log("XmlStore.newItem()");
		keywordArgs = (keywordArgs || {});
		var tagName = keywordArgs.tagName;
		if(!tagName){
			tagName = this.rootItem;
			if(tagName === ""){
				return null;
			}
		}

		var document = this._getDocument();
		var element = document.createElement(tagName);
		for(var attribute in keywordArgs){
			if(attribute === "tagName"){
				continue;
			}else if(attribute === "text()"){
				var text = document.createTextNode(keywordArgs[attribute]);
				element.appendChild(text);
			}else{
				attribute = this._getAttribute(tagName, attribute);
				if(attribute.charAt(0) === '@'){
					var name = attribute.substring(1);
					element.setAttribute(name, keywordArgs[attribute]);
				}else{
					var child = document.createElement(attribute);
					var text = document.createTextNode(keywordArgs[attribute]);
					child.appendChild(text);
					element.appendChild(child);
				}
			}
		}

		var item = this._getItem(element);
		this._newItems.push(item);
		return item; //object
	},
	
	deleteItem: function(/* item */ item){
		//	summary:
		//		Delete an dojox.data.XmlItem (wrapper to a XML element).
		//	item:
		//		An XML element to delete
		//	returns:
		//		True
		console.log("XmlStore.deleteItem()");
		var element = item.element;
		if(element.parentNode){
			this._backupItem(item);
			element.parentNode.removeChild(element);
			return true;
		}
		this._forgetItem(item);
		this._deletedItems.push(item);
		return true; //boolean
	},
	
	setValue: function(/* item */ item, /* attribute || string */ attribute, /* almost anything */ value){
		//	summary:
		//		Set an attribute value
		//	description:
		//		'item' must be an instance of a dojox.data.XmlItem from the store instance.
		//		If 'attribute' specifies "tagName", nothing is set and false is
		//		returned.
		//		If 'attribute' specifies "childNodes", the value (XML element) is
		//		added to the element.
		//		If 'attribute' specifies "text()", a text node is created with
		//		the value and set it to the element as a child.
		//		For generic attributes, if '_attributeMap' is specified,
		//		an actual attribute name is looked up with the tag name of
		//		the element and 'attribute' (concatenated with '.').
		//		Then, if 'attribute' starts with "@", the value is set to the XML
		//		attribute.
		//		Otherwise, a text node is created with the value and set it to
		//		the first child element of the tag name specified with 'attribute'.
		//		If the child element does not exist, it is created.
		//	item:
		//		An XML element that holds the attribute
		//	attribute:
		//		A tag name of a child element, An XML attribute name or one of
		//		special names
		//	value:
		//		A attribute value to set
		//	returns:
		//		False for "tagName", otherwise true
		if(attribute === "tagName"){
			return false; //boolean
		}

		this._backupItem(item);

		var element = item.element;
		if(attribute === "childNodes"){
			var child = value.element;
			element.appendChild(child);
		}else if(attribute === "text()"){
			while (element.firstChild){
				element.removeChild(element.firstChild);
			}
			var text = this._getDocument(element).createTextNode(value);
			element.appendChild(text);
		}else{
			attribute = this._getAttribute(element.nodeName, attribute);
			if(attribute.charAt(0) === '@'){
				var name = attribute.substring(1);
				element.setAttribute(name, value);
			}else{
				var child = null;
				for(var i = 0; i < element.childNodes.length; i++){
					var node = element.childNodes[i];
					if(	node.nodeType === 1 /*ELEMENT_NODE*/&&
						node.nodeName === attribute){
						child = node;
						break;
					}
				}
				var document = this._getDocument(element);
				if(child){
					while(child.firstChild){
						child.removeChild(child.firstChild);
					}
				}else{
					child = document.createElement(attribute);
					element.appendChild(child);
				}
				var text = document.createTextNode(value);
				child.appendChild(text);
			}
		}
		return true; //boolean
	},
	
	setValues: function(/* item */ item, /* attribute || string */ attribute, /* array */ values){
		//	summary:
		//		Set attribute values
		//	description:
		//		'item' must be an instance of a dojox.data.XmlItem from the store instance.
		//		If 'attribute' specifies "tagName", nothing is set and false is
		//		returned.
		//		If 'attribute' specifies "childNodes", the value (array of XML
		//		elements) is set to the element's childNodes.
		//		If 'attribute' specifies "text()", a text node is created with
		//		the values and set it to the element as a child.
		//		For generic attributes, if '_attributeMap' is specified,
		//		an actual attribute name is looked up with the tag name of
		//		the element and 'attribute' (concatenated with '.').
		//		Then, if 'attribute' starts with "@", the first value is set to
		//		the XML attribute.
		//		Otherwise, child elements of the tag name specified with
		//		'attribute' are replaced with new child elements and their
		//		child text nodes of values.
		//	item:
		//		An XML element that holds the attribute
		//	attribute:
		//		A tag name of child elements, an XML attribute name or one of
		//		special names
		//	value:
		//		A attribute value to set
		//	returns:
		//		False for "tagName", otherwise true
		if(attribute === "tagName"){
			return false; //boolean
		}

		this._backupItem(item);

		var element = item.element;
		if(attribute === "childNodes"){
			while(element.firstChild){
				element.removeChild(element.firstChild);
			}
			for(var i = 0; i < values.length; i++){
				var child = values[i].element;
				element.appendChild(child);
			}
		}else if(attribute === "text()"){
			while (element.firstChild){
				element.removeChild(element.firstChild);
			}
			var value = "";
			for(var i = 0; i < values.length; i++){
				value += values[i];
			}
			var text = this._getDocument(element).createTextNode(value);
			element.appendChild(text);
		}else{
			attribute = this._getAttribute(element.nodeName, attribute);
			if(attribute.charAt(0) === '@'){
				var name = attribute.substring(1);
				element.setAttribute(name, values[0]);
			}else{
				for(var i = element.childNodes.length - 1; i >= 0; i--){
					var node = element.childNodes[i];
					if(	node.nodeType === 1 /*ELEMENT_NODE*/ &&
						node.nodeName === attribute){
						element.removeChild(node);
					}
				}
				var document = this._getDocument(element);
				for(var i = 0; i < values.length; i++){
					var child = document.createElement(attribute);
					var text = document.createTextNode(values[i]);
					child.appendChild(text);
					element.appendChild(child);
				}
			}
		}
		return true; //boolean
	},
	
	unsetAttribute: function(/* item */ item, /* attribute || string */ attribute){
		//	summary:
		//		Remove an attribute
		//	description: