atomreadstore.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

if(!dojo._hasResource["dojox.data.AtomReadStore"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojox.data.AtomReadStore"] = true;
dojo.provide("dojox.data.AtomReadStore");

dojo.require("dojo.data.util.simpleFetch");
dojo.require("dojo.data.util.filter");
dojo.require("dojo.date.stamp");

dojo.experimental("dojox.data.AtomReadStore");

dojo.declare("dojox.data.AtomReadStore", null, {
	//	summary:
	//		A read only data store for Atom XML based services or documents
	//	description:
	//		A data store for Atom XML based services or documents.  This store is still under development
	//		and doesn't support wildcard filtering yet.  Attribute filtering is limited to category or id.

	constructor: function(/* object */ args) {
		//	summary:
		//		Constructor for the AtomRead store.
		//	args:
		//		An anonymous object to initialize properties.  It expects the following values:
		//		url:			The url to a service or an XML document that represents the store
		//		unescapeHTML:	A boolean to specify whether or not to unescape HTML text
		//		sendQuery:		A boolean indicate to add a query string to the service URL

		if(args){
			this.url = args.url;
			this.rewriteUrl = args.rewriteUrl;
			this.label = args.label || this.label;
			this.sendQuery = (args.sendQuery || args.sendquery || this.sendQuery);
			this.unescapeHTML = args.unescapeHTML;
		}
		if(!this.url){
			throw new Error("AtomReadStore: a URL must be specified when creating the data store");
		}
	},

	//Values that may be set by the parser.
	//Ergo, have to be instantiated to something
	//So the parser knows how to set them.
	url: "",

	label: "title",

	sendQuery: false,

	unescapeHTML: false,

	/* dojo.data.api.Read */

	getValue: function(/* item */ item, /* attribute || attribute-name-string */ attribute, /* value? */ defaultValue){
		//	summary:
		//		Return an attribute value
		//	description:
		//		'item' must be an instance of an object created by the AtomReadStore instance.
		//		Accepted attributes are id, subtitle, title, summary, content, author, updated,
		//		published, category, link and alternate
		//	item:
		//		An item returned by a call to the 'fetch' method.
		//	attribute:
		//		A attribute of the Atom Entry
		//	defaultValue:
		//		A default value
		//	returns:
		//		An attribute value found, otherwise 'defaultValue'
		this._assertIsItem(item);
		this._assertIsAttribute(attribute);
		this._initItem(item);
		attribute = attribute.toLowerCase();
		//If the attribute has previously been retrieved, then return it
		if(!item._attribs[attribute] && !item._parsed){
			this._parseItem(item);
			item._parsed = true;
		}
		var retVal = item._attribs[attribute];

		if(!retVal && attribute=="summary") {
			var content = this.getValue(item, "content");
			var regexp = new RegExp("/(<([^>]+)>)/g", "i");
			var text = content.text.replace(regexp,"");
			retVal = {
				text: text.substring(0, Math.min(400, text.length)),
				type: "text"
			};
			item._attribs[attribute] = retVal;
		}

		if(retVal && this.unescapeHTML){
			if ((attribute == "content" || attribute == "summary" || attribute == "subtitle") && !item["_"+attribute+"Escaped"]) {
				retVal.text = this._unescapeHTML(retVal.text);
				item["_"+attribute+"Escaped"] = true;
			}
		}
		return retVal ? dojo.isArray(retVal) ? retVal[0]: retVal : undefined;
	},

	getValues: function(/* item */ item, /* attribute || attribute-name-string */ attribute){
		//	summary:
		//		Return an attribute value
		//	description:
		//		'item' must be an instance of an object created by the AtomReadStore instance.
		//		Accepted attributes are id, subtitle, title, summary, content, author, updated,
		//		published, category, link and alternate
		//	item:
		//		An item returned by a call to the 'fetch' method.
		//	attribute:
		//		A attribute of the Atom Entry
		//	defaultValue:
		//		A default value
		//	returns:
		//		An array of values for the attribute value found, otherwise 'defaultValue'
		this._assertIsItem(item);
		this._assertIsAttribute(attribute);
		this._initItem(item);
		attribute = attribute.toLowerCase();
		//If the attribute has previously been retrieved, then return it
		if(!item._attribs[attribute]){
			this._parseItem(item);
		}
		var retVal = item._attribs[attribute];
		return retVal ? ((retVal.length !== undefined && typeof(retVal) !== "string") ? retVal : [retVal]) : undefined;
	},

	getAttributes: function(/* item */ item) {
		//	summary:
		//		Return an array of attribute names
		// 	description:
		//		'item' must be have been created by the AtomReadStore instance.
		//		tag names of child elements and XML attribute names of attributes
		//		specified to the element are returned along with special attribute
		//		names applicable to the element including "tagName", "childNodes"
		//		if the element has child elements, "text()" if the element has
		//		child text nodes, and attribute names in '_attributeMap' that match
		//		the tag name of the element.
		//	item:
		//		An XML element
		//	returns:
		//		An array of attributes found
		this._assertIsItem(item);
		if(!item._attribs){
			this._initItem(item);
			this._parseItem(item);
		}
		var attrNames = [];
		for(var x in item._attribs){
			attrNames.push(x);
		}
		return attrNames; //array
	},

	hasAttribute: function(/* item */ item, /* attribute || attribute-name-string */ attribute){
		//	summary:
		//		Check whether an element has the attribute
		//	item:
		//		'item' must be created by the AtomReadStore instance.
		//	attribute:
		//		An attribute of an Atom Entry item.
		//	returns:
		//		True if the element has the attribute, otherwise false
		return (this.getValue(item, attribute) !== undefined); //boolean
	},

	containsValue: function(/* item */ item, /* attribute || attribute-name-string */ attribute, /* anything */ value){
		//	summary:
		//		Check whether the attribute values contain the value
		//	item:
		//		'item' must be an instance of a dojox.data.XmlItem from the store instance.
		//	attribute:
		//		A tag name of a child element, An XML attribute name or one of
		//		special names
		//	returns:
		//		True if the attribute values contain the value, otherwise false
		var values = this.getValues(item, attribute);
		for(var i = 0; i < values.length; i++){
			if((typeof value === "string")){
				if(values[i].toString && values[i].toString() === value){
					return true;
				}
			}else if (values[i] === value){
				return true; //boolean
			}
		}
		return false;//boolean
	},

	isItem: function(/* anything */ something){
		//	summary:
		//		Check whether the object is an item (XML element)
		//	item:
		//		An object to check
		// 	returns:
		//		True if the object is an XML element, otherwise false
		if(something && something.element && something.store && something.store === this){
			return true; //boolean
		}
		return false; //boolran
	},

	isItemLoaded: function(/* anything */ something){
		//	summary:
		//		Check whether the object is an item (XML element) and loaded
		//	item:
		//		An object to check
		//	returns:
		//		True if the object is an XML element, otherwise false
		return this.isItem(something); //boolean
	},

	loadItem: function(/* object */ keywordArgs){
		//	summary:
		//		Load an item (XML element)
		//	keywordArgs:
		//		object containing the args for loadItem.  See dojo.data.api.Read.loadItem()
	},

	getFeatures: function() {
		//	summary:
		//		Return supported data APIs
		//	returns:
		//		"dojo.data.api.Read" and "dojo.data.api.Write"
		var features = {
			"dojo.data.api.Read": true
		};
		return features; //array
	},

	getLabel: function(/* item */ item){
		//	summary:
		//		See dojo.data.api.Read.getLabel()
		if((this.label !== "") && this.isItem(item)){
			var label = this.getValue(item,this.label);
			if(label && label.text){
				return label.text;
			}else if (label){
				return label.toString();
			}else{
				return undefined;
			}
		}
		return undefined; //undefined
	},

	getLabelAttributes: function(/* item */ item){
		//	summary:
		//		See dojo.data.api.Read.getLabelAttributes()
		if(this.label !== ""){
			return [this.label]; //array
		}
		return null; //null
	},

	getFeedValue: function(attribute, defaultValue){
		// summary:
		//		Non-API method for retrieving values regarding the Atom feed,
		//		rather than the Atom entries.
		var values = this.getFeedValues(attribute, defaultValue);
		if(dojo.isArray(values)){
			return values[0];
		}
		return values;
	},

	getFeedValues: function(attribute, defaultValue){
		// summary:
		//		Non-API method for retrieving values regarding the Atom feed,
		//		rather than the Atom entries.
		if(!this.doc){
			return defaultValue;
		}
		if(!this._feedMetaData){
			this._feedMetaData = {