jquery-latest.js

使用 jQuery 简化 Ajax 开发

			if (s.processData && typeof s.data != "string")
    			s.data = jQuery.param(s.data);
			// append data to url for get requests
			if( s.type.toLowerCase() == "get" ) {
				// "?" + data or "&" + data (in case there are already params)
				s.url += ((s.url.indexOf("?") > -1) ? "&" : "?") + s.data;
				// IE likes to send both get and post data, prevent this
				s.data = null;
			}
		}

		// Watch for a new set of requests
		if ( s.global && ! jQuery.active++ )
			jQuery.event.trigger( "ajaxStart" );

		var requestDone = false;

		// Create the request object
		var xml = new XMLHttpRequest();

		// Open the socket
		xml.open(s.type, s.url, s.async);

		// Set the correct header, if data is being sent
		if ( s.data )
			xml.setRequestHeader("Content-Type", s.contentType);

		// Set the If-Modified-Since header, if ifModified mode.
		if ( s.ifModified )
			xml.setRequestHeader("If-Modified-Since",
				jQuery.lastModified[s.url] || "Thu, 01 Jan 1970 00:00:00 GMT" );

		// Set header so the called script knows that it's an XMLHttpRequest
		xml.setRequestHeader("X-Requested-With", "XMLHttpRequest");

		// Make sure the browser sends the right content length
		if ( xml.overrideMimeType )
			xml.setRequestHeader("Connection", "close");
			
		// Allow custom headers/mimetypes
		if( s.beforeSend )
			s.beforeSend(xml);
			
		if ( s.global )
		    jQuery.event.trigger("ajaxSend", [xml, s]);

		// Wait for a response to come back
		var onreadystatechange = function(isTimeout){
			// The transfer is complete and the data is available, or the request timed out
			if ( xml && (xml.readyState == 4 || isTimeout == "timeout") ) {
				requestDone = true;
				
				// clear poll interval
				if (ival) {
					clearInterval(ival);
					ival = null;
				}
				
				var status;
				try {
					status = jQuery.httpSuccess( xml ) && isTimeout != "timeout" ?
						s.ifModified && jQuery.httpNotModified( xml, s.url ) ? "notmodified" : "success" : "error";
					// Make sure that the request was successful or notmodified
					if ( status != "error" ) {
						// Cache Last-Modified header, if ifModified mode.
						var modRes;
						try {
							modRes = xml.getResponseHeader("Last-Modified");
						} catch(e) {} // swallow exception thrown by FF if header is not available
	
						if ( s.ifModified && modRes )
							jQuery.lastModified[s.url] = modRes;
	
						// process the data (runs the xml through httpData regardless of callback)
						var data = jQuery.httpData( xml, s.dataType );
	
						// If a local callback was specified, fire it and pass it the data
						if ( s.success )
							s.success( data, status );
	
						// Fire the global callback
						if( s.global )
							jQuery.event.trigger( "ajaxSuccess", [xml, s] );
					} else
						jQuery.handleError(s, xml, status);
				} catch(e) {
					status = "error";
					jQuery.handleError(s, xml, status, e);
				}

				// The request was completed
				if( s.global )
					jQuery.event.trigger( "ajaxComplete", [xml, s] );

				// Handle the global AJAX counter
				if ( s.global && ! --jQuery.active )
					jQuery.event.trigger( "ajaxStop" );

				// Process result
				if ( s.complete )
					s.complete(xml, status);

				// Stop memory leaks
				if(s.async)
					xml = null;
			}
		};
		
		// don't attach the handler to the request, just poll it instead
		var ival = setInterval(onreadystatechange, 13); 

		// Timeout checker
		if ( s.timeout > 0 )
			setTimeout(function(){
				// Check to see if the request is still happening
				if ( xml ) {
					// Cancel the request
					xml.abort();

					if( !requestDone )
						onreadystatechange( "timeout" );
				}
			}, s.timeout);
			
		// Send the data
		try {
			xml.send(s.data);
		} catch(e) {
			jQuery.handleError(s, xml, null, e);
		}
		
		// firefox 1.5 doesn't fire statechange for sync requests
		if ( !s.async )
			onreadystatechange();
		
		// return XMLHttpRequest to allow aborting the request etc.
		return xml;
	},

	handleError: function( s, xml, status, e ) {
		// If a local callback was specified, fire it
		if ( s.error ) s.error( xml, status, e );

		// Fire the global callback
		if ( s.global )
			jQuery.event.trigger( "ajaxError", [xml, s, e] );
	},

	// Counter for holding the number of active queries
	active: 0,

	// Determines if an XMLHttpRequest was successful or not
	httpSuccess: function( r ) {
		try {
			return !r.status && location.protocol == "file:" ||
				( r.status >= 200 && r.status < 300 ) || r.status == 304 ||
				jQuery.browser.safari && r.status == undefined;
		} catch(e){}
		return false;
	},

	// Determines if an XMLHttpRequest returns NotModified
	httpNotModified: function( xml, url ) {
		try {
			var xmlRes = xml.getResponseHeader("Last-Modified");

			// Firefox always returns 200. check Last-Modified date
			return xml.status == 304 || xmlRes == jQuery.lastModified[url] ||
				jQuery.browser.safari && xml.status == undefined;
		} catch(e){}
		return false;
	},

	/* Get the data out of an XMLHttpRequest.
	 * Return parsed XML if content-type header is "xml" and type is "xml" or omitted,
	 * otherwise return plain text.
	 * (String) data - The type of data that you're expecting back,
	 * (e.g. "xml", "html", "script")
	 */
	httpData: function( r, type ) {
		var ct = r.getResponseHeader("content-type");
		var data = !type && ct && ct.indexOf("xml") >= 0;
		data = type == "xml" || data ? r.responseXML : r.responseText;

		// If the type is "script", eval it in global context
		if ( type == "script" )
			jQuery.globalEval( data );

		// Get the JavaScript object, if JSON is used.
		if ( type == "json" )
			eval( "data = " + data );

		// evaluate scripts within html
		if ( type == "html" )
			jQuery("<div>").html(data).evalScripts();

		return data;
	},

	// Serialize an array of form elements or a set of
	// key/values into a query string
	param: function( a ) {
		var s = [];

		// If an array was passed in, assume that it is an array
		// of form elements
		if ( a.constructor == Array || a.jquery )
			// Serialize the form elements
			jQuery.each( a, function(){
				s.push( encodeURIComponent(this.name) + "=" + encodeURIComponent( this.value ) );
			});

		// Otherwise, assume that it's an object of key/value pairs
		else
			// Serialize the key/values
			for ( var j in a )
				// If the value is an array then the key names need to be repeated
				if ( a[j] && a[j].constructor == Array )
					jQuery.each( a[j], function(){
						s.push( encodeURIComponent(j) + "=" + encodeURIComponent( this ) );
					});
				else
					s.push( encodeURIComponent(j) + "=" + encodeURIComponent( a[j] ) );

		// Return the resulting serialization
		return s.join("&");
	},
	
	// evalulates a script in global context
	// not reliable for safari
	globalEval: function( data ) {
		if ( window.execScript )
			window.execScript( data );
		else if ( jQuery.browser.safari )
			// safari doesn't provide a synchronous global eval
			window.setTimeout( data, 0 );
		else
			eval.call( window, data );
	}

});
jQuery.fn.extend({

	show: function(speed,callback){
		var hidden = this.filter(":hidden");
		speed ?
			hidden.animate({
				height: "show", width: "show", opacity: "show"
			}, speed, callback) :
			
			hidden.each(function(){
				this.style.display = this.oldblock ? this.oldblock : "";
				if ( jQuery.css(this,"display") == "none" )
					this.style.display = "block";
			});
		return this;
	},

	hide: function(speed,callback){
		var visible = this.filter(":visible");
		speed ?
			visible.animate({
				height: "hide", width: "hide", opacity: "hide"
			}, speed, callback) :
			
			visible.each(function(){
				this.oldblock = this.oldblock || jQuery.css(this,"display");
				if ( this.oldblock == "none" )
					this.oldblock = "block";
				this.style.display = "none";
			});
		return this;
	},

	// Save the old toggle function
	_toggle: jQuery.fn.toggle,
	toggle: function( fn, fn2 ){
		var args = arguments;
		return jQuery.isFunction(fn) && jQuery.isFunction(fn2) ?
			this._toggle( fn, fn2 ) :
			this.each(function(){
				jQuery(this)[ jQuery(this).is(":hidden") ? "show" : "hide" ]
					.apply( jQuery(this), args );
			});
	},
	slideDown: function(speed,callback){
		return this.animate({height: "show"}, speed, callback);
	},
	slideUp: function(speed,callback){
		return this.animate({height: "hide"}, speed, callback);
	},
	slideToggle: function(speed, callback){
		return this.each(function(){
			var state = jQuery(this).is(":hidden") ? "show" : "hide";
			jQuery(this).animate({height: state}, speed, callback);
		});
	},
	fadeIn: function(speed, callback){
		return this.animate({opacity: "show"}, speed, callback);
	},
	fadeOut: function(speed, callback){
		return this.animate({opacity: "hide"}, speed, callback);
	},
	fadeTo: function(speed,to,callback){
		return this.animate({opacity: to}, speed, callback);
	},
	animate: function( prop, speed, easing, callback ) {
		return this.queue(function(){
		
			this.curAnim = jQuery.extend({}, prop);
			var opt = jQuery.speed(speed, easing, callback);
			
			for ( var p in prop ) {
				var e = new jQuery.fx( this, opt, p );
				if ( prop[p].constructor == Number )
					e.custom( e.cur(), prop[p] );
				else
					e[ prop[p] ]( prop );
			}
			
		});
	},
	queue: function(type,fn){
		if ( !fn ) {
			fn = type;
			type = "fx";
		}
	
		return this.each(function(){
			if ( !this.queue )
				this.queue = {};
	
			if ( !this.queue[type] )
				this.queue[type] = [];
	
			this.queue[type].push( fn );
		
			if ( this.queue[type].length == 1 )
				fn.apply(this);
		});
	}

});

jQuery.extend({
	
	speed: function(speed, easing, fn) {
		var opt = speed && speed.constructor == Object ? speed : {
			complete: fn || !fn && easing || 
				jQuery.isFunction( speed ) && speed,
			duration: speed,
			easing: fn && easing || easing && easing.constructor != Function && easing
		};

		opt.duration = (opt.duration && opt.duration.constructor == Number ? 
			opt.duration : 
			{ slow: 600, fast: 200 }[opt.duration]) || 400;
	
		// Queueing
		opt.old = opt.complete;
		opt.complete = function(){
			jQuery.dequeue(this, "fx");
			if ( jQuery.isFunction( opt.old ) )
				opt.old.apply( this );
		};
	
		return opt;
	},
	
	easing: {},
	
	queue: {},
	
	dequeue: function(elem,type){
		type = type || "fx";
	
		if ( elem.queue && elem.queue[type] ) {
			// Remove self
			elem.queue[type].shift();
	
			// Get next function
			var f = elem.queue[type][0];
		
			if ( f ) f.apply( elem );
		}
	},

	/*
	 * I originally wrote fx() as a clone of moo.fx and in the process
	 * of making it small in size the code became illegible to sane
	 * people. You've been warned.
	 */
	
	fx: function( elem, options, prop ){

		var z = this;

		// The styles
		var y = elem.style;
		
		// Store display property
		var oldDisplay = jQuery.css(elem, "display");

		// Make sure that nothing sneaks out
		y.overflow = "hidden";

		// Simple function for setting a style value
		z.a = function(){
			if ( options.step )
				options.step.apply( elem, [ z.now ] );

			if ( prop == "opacity" )
				jQuery.attr(y, "opacity", z.now); // Let attr handle opacity
			else if ( parseInt(z.now) ) // My hate for IE will never die
				y[prop] = parseInt(z.now) + "px";
			
			y.display = "block"; // Set display property to block for animation
		};

		// Figure out the maximum number to run to
		z.max = function(){
			return parseFloat( jQuery.css(elem,prop) );
		};

		// Get the current size
		z.cur = function(){
			var r = parseFloat( jQuery.curCSS(elem, prop) );
			return r && r > -10000 ? r : z.max();
		};

		// Start an animation from one number to another
		z.custom = function(from,to){
			z.startTime = (new Date()).getTime();
			z.now = from;
			z.a();

			z.timer = setInterval(function(){
				z.step(from, to);
			}, 13);
		};

		// Simple 'show' function
		z.show = function(){
			if ( !elem.orig ) elem.orig = {};

			// Remember where we started, so that we can go back to it later
			elem.orig[prop] = this.cur();

			options.show = true;

			// Begin the animation
			z.custom(0, elem.orig[prop]);

			// Stupid IE, look what you made me do
			if ( prop != "opacity" )
				y[prop] = "1px";
		};

		// Simple 'hide' function
		z.hide = function(){
			if ( !elem.orig ) elem.orig = {};

			// Remember where we started, so that we can go back to it later
			elem.orig[prop] = this.cur();

			options.hide = true;

			// Begin the animation
			z.custom(elem.orig[prop], 0);
		};
		
		//Simple 'toggle' function
		z.toggle = function() {
			if ( !elem.orig ) elem.orig = {};

			// Remember where we started, so that we can go back to it later
			elem.orig[prop] = this.cur();

			if(oldDisplay == "none")  {
				options.show = true;
				
				// Stupid IE, look what you made me do
				if ( prop != "opacity" )
					y[prop] = "1px";

				// Begin the animation
				z.custom(0, elem.orig[prop]);	
			} else {
				options.hide = true;

				// Begin the animation
				z.custom(elem.orig[prop], 0);
			}		
		};

		// Each step of an animation
		z.step = function(firstNum, lastNum){
			var t = (new Date()).getTime();

			if (t > options.duration + z.startTime) {
				// Stop the timer
				clearInterval(z.timer);
				z.timer = null;

				z.now = lastNum;
				z.a();

				if (elem.curAnim) elem.curAnim[ prop ] = true;

				var done = true;
				for ( var i in elem.curAnim )
					if ( elem.curAnim[i] !== true )
						done = false;

				if ( done ) {
					// Reset the overflow
					y.overflow = "";
					
					// Reset the display
					y.display = oldDisplay;
					if (jQuery.css(elem, "display") == "none")
						y.display = "block";

					// Hide the element if the "hide" operation was done
					if ( options.hide ) 
						y.display = "none";

					// Reset the properties, if the item has been hidden or shown
					if ( options.hide || options.show )
						for ( var p in elem.curAnim )
							if (p == "opacity")
								jQuery.attr(y, p, elem.orig[p]);
							else
								y[p] = "";
				}

				// If a callback was provided, execute it
				if ( done && jQuery.isFunction( options.complete ) )
					// Execute the complete function
					options.complete.apply( elem );
			} else {
				var n = t - this.startTime;
				// Figure out where in the animation we are and set the number
				var p = n / options.duration;
				
				// If the easing function exists, then use it 
				z.now = options.easing && jQuery.easing[options.easing] ?
					jQuery.easing[options.easing](p, n,  firstNum, (lastNum-firstNum), options.duration) :
					// else use default linear easing
					((-Math.cos(p*Math.PI)/2) + 0.5) * (lastNum-firstNum) + firstNum;

				// Perform the next step of the animation
				z.a();
			}
		};
	
	}
});
}