htmlstore.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

	isItemLoaded: function(/* anything */ something){
		//	summary: 
		//		See dojo.data.api.Read.isItemLoaded()
		return this.isItem(something);
	},

	loadItem: function(/* Object */ keywordArgs){
		//	summary: 
		//		See dojo.data.api.Read.loadItem()
		this._assertIsItem(keywordArgs.item);
	},
	
	_fetchItems: function(request, fetchHandler, errorHandler){
		//	summary:
		//		Fetch items (XML elements) that match to a query
		//	description:
		//		If '_fetchUrl' is specified, it is used to load an XML document
		//		with a query string.
		//		Otherwise and if 'url' is specified, the XML document is
		//		loaded and list XML elements that match to a query (set of element
		//		names and their text attribute values that the items to contain).
		//		A wildcard, "*" can be used to query values to match all
		//		occurrences.
		//		If '_rootItem' is specified, it is used to fetch items.
		//	request:
		//		A request object
		//	fetchHandler:
		//		A function to call for fetched items
		//	errorHandler:
		//		A function to call on error
		
		if(this._rootNode){
			this._finishFetchItems(request, fetchHandler, errorHandler);
		}else{
			if(!this.url){
				this._rootNode = dojo.byId(this.dataId);
			}else{
				var getArgs = {
						url: this.url,
						handleAs: "text"
					};
				var self = this;
				var getHandler = dojo.xhrGet(getArgs);
				getHandler.addCallback(function(data){
					var findNode = function(node, id){
						if(node.id == id){
							return node; //object
						}
						if(node.childNodes){
							for(var i=0; i<node.childNodes.length; i++){
								var returnNode = findNode(node.childNodes[i], id);
								if(returnNode){
									return returnNode; //object
								}
							}
						}
						return null; //null
					}

					var d = document.createElement("div");
					d.innerHTML = data;
					self._rootNode = findNode(d, self.dataId);
					self._indexItems();
					self._finishFetchItems(request, fetchHandler, errorHandler);
				});
				getHandler.addErrback(function(error){
					errorHandler(error, request);
				});
			}
		}
	},
	
	_finishFetchItems: function(request, fetchHandler, errorHandler){
		//	summary:
		//		Internal function for processing the passed in request and locating the requested items.
		var items = null;
		var arrayOfAllItems = this._getAllItems();
		if(request.query){
			var ignoreCase = request.queryOptions ? request.queryOptions.ignoreCase : false; 
			items = [];

			//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 = {};
			var key;
                        var value;
			for(key in request.query){
				value = request.query[key]+'';
				if(typeof value === "string"){
					regexpList[key] = dojo.data.util.filter.patternToRegExp(value, ignoreCase);
				}
			}

			for(var i = 0; i < arrayOfAllItems.length; ++i){
				var match = true;
				var candidateItem = arrayOfAllItems[i];
				for(key in request.query){
					value = request.query[key]+'';
					if (!this._containsValue(candidateItem, key, value, regexpList[key])){
						match = false;
					}
				}
				if(match){
					items.push(candidateItem);
				}
			}
			fetchHandler(items, request);
		}else{
			// We want a copy to pass back in case the parent wishes to sort the array.  We shouldn't allow resort 
			// of the internal list so that multiple callers can get listsand sort without affecting each other.
			if(arrayOfAllItems.length> 0){
				items = arrayOfAllItems.slice(0,arrayOfAllItems.length); 
			}
			fetchHandler(items, request);
		}
	},

	getFeatures: function(){
		//	summary: 
		//		See dojo.data.api.Read.getFeatures()
		return {
			'dojo.data.api.Read': true,
			'dojo.data.api.Identity': true
		};
	},
	
	close: function(/*dojo.data.api.Request || keywordArgs || null */ request){
		//	summary:
		//		See dojo.data.api.Read.close()
		// nothing to do here!
	},

	getLabel: function(/* item */ item){
		//	summary: 
		//		See dojo.data.api.Read.getLabel()
		if(this.isItem(item)){
			if(item.cells){
				return "Item #" + this.getIdentity(item);
			}else{
				return this.getValue(item,"name");
			}
		}
		return undefined;
	},

	getLabelAttributes: function(/* item */ item){
		//	summary: 
		//		See dojo.data.api.Read.getLabelAttributes()
		if(item.cells){
			return null;
		}else{
			return ["name"];
		}
	},

/***************************************
     dojo.data.api.Identity API
***************************************/

	getIdentity: function(/* item */ item){
		//	summary: 
		//		See dojo.data.api.Identity.getIdentity()
		this._assertIsItem(item);
		if(this.hasAttribute(item, "name")){
		 	return this.getValue(item,"name");
		}else{
			return item._ident;
		}
	},

	getIdentityAttributes: function(/* item */ item){
		 //	summary: 
		 //		See dojo.data.api.Identity.getIdentityAttributes()
		 //Identity isn't taken from a public attribute.
		 return null;
	},

	fetchItemByIdentity: function(keywordArgs){
		//	summary: 
		//		See dojo.data.api.Identity.fetchItemByIdentity()
		var identity = keywordArgs.identity;
		var self = this;
		var item = null;
		var scope = null;

		if(!this._rootNode){
			if(!this.url){
				this._rootNode = dojo.byId(this.dataId);
				this._indexItems();
				if(self._rootNode.rows){ //Table
					item = this._rootNode.rows[identity + 1];
				}else{ //Lists
					for(var i = 0; i < self._rootNode.childNodes.length; i++){
						if(self._rootNode.childNodes[i].nodeType === 1 && identity === dojox.data.dom.textContent(self._rootNode.childNodes[i])) {
								item = self._rootNode.childNodes[i];
						}
					}
				}
				if(keywordArgs.onItem){
					scope = keywordArgs.scope?keywordArgs.scope:dojo.global;
					keywordArgs.onItem.call(scope, item);
				}

			}else{
				var getArgs = {
						url: this.url,
						handleAs: "text"
					};
				var getHandler = dojo.xhrGet(getArgs);
				getHandler.addCallback(function(data){
					var findNode = function(node, id){
						if(node.id == id){
							return node; //object
						}
						if(node.childNodes){
							for(var i=0; i<node.childNodes.length; i++){
								var returnNode = findNode(node.childNodes[i], id);
								if(returnNode){
									return returnNode; //object
								}
							}
						}
						return null; //null
					}
					var d = document.createElement("div");
					d.innerHTML = data;
					self._rootNode = findNode(d, self.dataId);
					self._indexItems();
					if(self._rootNode.rows && identity <= self._rootNode.rows.length){ //Table
						item = self._rootNode.rows[identity-1];
					}else{ //List
						for(var i = 0; i < self._rootNode.childNodes.length; i++){
							if(self._rootNode.childNodes[i].nodeType === 1 && identity === dojox.data.dom.textContent(self._rootNode.childNodes[i])) {
									item = self._rootNode.childNodes[i];
									break;
							}
						}
					}
					if(keywordArgs.onItem){
						scope = keywordArgs.scope?keywordArgs.scope:dojo.global;
						keywordArgs.onItem.call(scope, item);
					}
				});
				getHandler.addErrback(function(error){
					if(keywordArgs.onError){
						scope = keywordArgs.scope?keywordArgs.scope:dojo.global;
						keywordArgs.onError.call(scope, error);

					}
				});
			}
		}else{
			if(this._rootNode.rows[identity+1]){
				item = this._rootNode.rows[identity+1];
				if(keywordArgs.onItem){
					scope = keywordArgs.scope?keywordArgs.scope:dojo.global;
					keywordArgs.onItem.call(scope, item);
				}
			}
		}
	}
});
dojo.extend(dojox.data.HtmlStore,dojo.data.util.simpleFetch);

}