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

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

dojo.declare("dojox.data.CsvStore", null, {
	//	summary:
	//		The CsvStore implements the dojo.data.api.Read API and reads
	//		data from files in CSV (Comma Separated Values) format.
	//		All values are simple string values. References to other items
	//		are not supported as attribute values in this datastore.
	//
	//		Example data file:
	//		name, color, age, tagline
	//		Kermit, green, 12, "Hi, I'm Kermit the Frog."
	//		Fozzie Bear, orange, 10, "Wakka Wakka Wakka!"
	//		Miss Piggy, pink, 11, "Kermie!"
	//
	//		Note that values containing a comma must be enclosed with quotes ("")
	//		Also note that values containing quotes must be escaped with two consecutive quotes (""quoted"")
	
	/* examples:
	 *   var csvStore = new dojox.data.CsvStore({url:"movies.csv");
	 *   var csvStore = new dojox.data.CsvStore({url:"http://example.com/movies.csv");
	 */

	constructor: function(/* Object */ keywordParameters){
		// summary: initializer
		// keywordParameters: {url: String}
		// keywordParameters: {data: String}
		// keywordParameters: {label: String} The column label for the column to use for the label returned by getLabel.
		
		this._attributes = [];			// e.g. ["Title", "Year", "Producer"]
		this._attributeIndexes = {};	// e.g. {Title: 0, Year: 1, Producer: 2}
 		this._dataArray = [];			// e.g. [[<Item0>],[<Item1>],[<Item2>]]
 		this._arrayOfAllItems = [];		// e.g. [{_csvId:0,_csvStore:store},...]
		this._loadFinished = false;
		if(keywordParameters.url){
			this.url = keywordParameters.url;
		}
		this._csvData = keywordParameters.data;
		if(keywordParameters.label){
			this.label = keywordParameters.label;
		}else if(this.label === ""){
			this.label = undefined;
		}
		this._storeProp = "_csvStore";	// Property name for the store reference on every item.
		this._idProp = "_csvId"; 		// Property name for the Item Id on every item.
		this._features = {	
			'dojo.data.api.Read': true,
			'dojo.data.api.Identity': true 
		};
		this._loadInProgress = false;	//Got to track the initial load to prevent duelling loads of the dataset.
		this._queuedFetches = [];
	},

	url: "", //Declarative hook for setting Csv source url.

	label: "", //Declarative hook for setting the label attribute. 
	
	_assertIsItem: function(/* item */ item){
		//	summary:
		//      This function tests whether the item passed in is indeed an item in the store.
		//	item: 
		//		The item to test for being contained by the store.
		if(!this.isItem(item)){ 
			throw new Error("dojox.data.CsvStore: a function was passed an item argument that was not an item");
		}
	},
	
	_assertIsAttribute: function(/* item || String */ attribute){
		//	summary:
		//      This function tests whether the item passed in is indeed a valid 'attribute' like type for the store.
		//	attribute: 
		//		The attribute to test for being contained by the store.
		if(!dojo.isString(attribute)){ 
			throw new Error("dojox.data.CsvStore: a function was passed an attribute argument that was not an attribute object nor an attribute name string");
		}
	},

/***************************************
     dojo.data.api.Read API
***************************************/
	getValue: function(	/* item */ item, 
						/* attribute || attribute-name-string */ attribute, 
						/* value? */ defaultValue){
		//	summary: 
		//      See dojo.data.api.Read.getValue()
		//		Note that for the CsvStore, an empty string value is the same as no value, 
		// 		so the defaultValue would be returned instead of an empty string.
		this._assertIsItem(item);
		this._assertIsAttribute(attribute);
		var itemValue = defaultValue;
		if(this.hasAttribute(item, attribute)){
			var itemData = this._dataArray[this.getIdentity(item)];
			itemValue = itemData[this._attributeIndexes[attribute]];
		}
		return itemValue; //String
	},

	getValues: function(/* item */ item, 
						/* attribute || attribute-name-string */ attribute){
		//	summary: 
		//		See dojo.data.api.Read.getValues()
		// 		CSV syntax does not support multi-valued attributes, so this is just a
		// 		wrapper function for getValue().
		var value = this.getValue(item, attribute);
		return (value ? [value] : []); //Array
	},

	getAttributes: function(/* item */ item){
		//	summary: 
		//		See dojo.data.api.Read.getAttributes()
		this._assertIsItem(item);
		var attributes = [];
		var itemData = this._dataArray[this.getIdentity(item)];
		for(var i=0; i<itemData.length; i++){
			// Check for empty string values. CsvStore treats empty strings as no value.
			if(itemData[i] != ""){
				attributes.push(this._attributes[i]);
			}
		}
		return attributes; //Array
	},

	hasAttribute: function(	/* item */ item,
							/* attribute || attribute-name-string */ attribute){
		//	summary: 
		//		See dojo.data.api.Read.hasAttribute()
		// 		The hasAttribute test is true if attribute has an index number within the item's array length
		// 		AND if the item has a value for that attribute. Note that for the CsvStore, an
		// 		empty string value is the same as no value.
		this._assertIsItem(item);
		this._assertIsAttribute(attribute);
		var attributeIndex = this._attributeIndexes[attribute];
		var itemData = this._dataArray[this.getIdentity(item)];
		return (typeof attributeIndex != "undefined" && attributeIndex < itemData.length && itemData[attributeIndex] != ""); //Boolean
	},

	containsValue: function(/* item */ item, 
							/* attribute || attribute-name-string */ attribute, 
							/* anything */ value){
		//	summary: 
		//		See dojo.data.api.Read.containsValue()
		var regexp = undefined;
		if(typeof value === "string"){
		   regexp = dojo.data.util.filter.patternToRegExp(value, false);
		}
		return this._containsValue(item, attribute, value, regexp); //boolean.
	},

	_containsValue: function(	/* item */ item, 
								/* attribute || attribute-name-string */ attribute, 
								/* anything */ value,
								/* RegExp?*/ regexp){
		//	summary: 
		//		Internal function for looking at the values contained by the item.
		//	description: 
		//		Internal function for looking at the values contained by the item.  This 
		//		function allows for denoting if the comparison should be case sensitive for
		//		strings or not (for handling filtering cases where string case should not matter)
		//	
		//	item:
		//		The data item to examine for attribute values.
		//	attribute:
		//		The attribute to inspect.
		//	value:	
		//		The value to match.
		//	regexp:
		//		Optional regular expression generated off value if value was of string type to handle wildcarding.
		//		If present and attribute values are string, then it can be used for comparison instead of 'value'
		var values = this.getValues(item, attribute);
		for(var i = 0; i < values.length; ++i){
			var possibleValue = values[i];
			if(typeof possibleValue === "string" && regexp){
				return (possibleValue.match(regexp) !== null);
			}else{
				//Non-string matching.
				if(value === possibleValue){
					return true; // Boolean
				}
			}
		}
		return false; // Boolean
	},

	isItem: function(/* anything */ something){
		//	summary: 
		//		See dojo.data.api.Read.isItem()
		if(something && something[this._storeProp] === this){
			var identity = something[this._idProp];
			if(identity >= 0 && identity < this._dataArray.length){
				return true; //Boolean
			}
		}
		return false; //Boolean
	},

	isItemLoaded: function(/* anything */ something){
		//	summary: 
		//		See dojo.data.api.Read.isItemLoaded()
		//		The CsvStore always loads all items, so if it's an item, then it's loaded.
		return this.isItem(something); //Boolean
	},

	loadItem: function(/* item */ item){
		//	summary: 
		//		See dojo.data.api.Read.loadItem()
		//	description:
		//		The CsvStore always loads all items, so if it's an item, then it's loaded.
		//		From the dojo.data.api.Read.loadItem docs:
		//			If a call to isItemLoaded() returns true before loadItem() is even called,
		//			then loadItem() need not do any work at all and will not even invoke
		//			the callback handlers.
	},

	getFeatures: function(){
		//	summary: 
		//		See dojo.data.api.Read.getFeatures()
		return this._features; //Object
	},

	getLabel: function(/* item */ item){
		//	summary: 
		//		See dojo.data.api.Read.getLabel()
		if(this.label && this.isItem(item)){
			return this.getValue(item,this.label); //String
		}
		return undefined; //undefined
	},

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


	// The dojo.data.api.Read.fetch() function is implemented as
	// a mixin from dojo.data.util.simpleFetch.
	// That mixin requires us to define _fetchItems().
	_fetchItems: function(	/* Object */ keywordArgs, 
							/* Function */ findCallback, 
							/* Function */ errorCallback){
		//	summary: 
		//		See dojo.data.util.simpleFetch.fetch()
		
		var self = this;

		var filter = function(requestArgs, arrayOfAllItems){
			var items = null;
			if(requestArgs.query){
				items = [];
				var ignoreCase = requestArgs.queryOptions ? requestArgs.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 requestArgs.query){
					var value = requestArgs.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(var key in requestArgs.query){
						var value = requestArgs.query[key];
						if(!self._containsValue(candidateItem, key, value, regexpList[key])){
							match = false;
						}
					}
					if(match){
						items.push(candidateItem);