jquery/src/ajax.js

(function( jQuery ) {
	
var rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi,
	rselectTextarea = /^(?:select|textarea)/i,
	rinput = /^(?:color|date|datetime|email|hidden|month|number|password|range|search|tel|text|time|url|week)$/i,
	rbracket = /\[\]$/,
	rquery = /\?/,
	r20 = /%20/g,

	// Keep a copy of the old load method
	_load = jQuery.fn.load;

jQuery.fn.extend({
	load: function( url, params, callback ) {
		if ( typeof url !== "string" && _load ) {
			return _load.apply( this, arguments );

		// Don't do a request if no elements are being requested
		} else if ( !this.length ) {
			return this;
		}

		var off = url.indexOf(" ");
		if ( off >= 0 ) {
			var selector = url.slice(off, url.length);
			url = url.slice(0, off);
		}

		// Default to a GET request
		var type = "GET";

		// If the second parameter was provided
		if ( params ) {
			// If it's a function
			if ( jQuery.isFunction( params ) ) {
				// We assume that it's the callback
				callback = params;
				params = null;

			// Otherwise, build a param string
			} else if ( typeof params === "object" ) {
				params = jQuery.param( params, jQuery.ajaxSettings.traditional );
				type = "POST";
			}
		}
		
		var self = this;
		
		// Request the remote document
		jQuery.ajax({
			url: url,
			type: type,
			dataType: "html",
			data: params,
			complete: function( res, status ) {
				// If successful, inject the HTML into all the matched elements
				if ( status === "success" || status === "notmodified" ) {
					// See if a selector was specified
					self.html( selector ?
						// Create a dummy div to hold the results
						jQuery("<div>")
							// inject the contents of the document in, removing the scripts
							// to avoid any 'Permission Denied' errors in IE
							.append(res.responseText.replace(rscript, ""))

							// Locate the specified elements
							.find(selector) :

						// If not, just inject the full result
						res.responseText );
				}

				if ( callback ) {
					self.each( callback, [res.responseText, status, res] );
				}
			}
		});

		return this;
	},

	serialize: function() {
		return jQuery.param(this.serializeArray());
	},

	serializeArray: function() {
		return this.map(function(){
			return this.elements ? jQuery.makeArray(this.elements) : this;
		})
		.filter(function(){
			return this.name && !this.disabled &&
				(this.checked || rselectTextarea.test(this.nodeName) ||
					rinput.test(this.type));
		})
		.map(function(i, elem){
			var val = jQuery(this).val();

			return val == null ?
				null :
				jQuery.isArray(val) ?
					jQuery.map( val, function(val, i){
						return {name: elem.name, value: val};
					}) :
					{name: elem.name, value: val};
		}).get();
	}
});

// Attach a bunch of functions for handling common AJAX events
jQuery.each( "ajaxStart ajaxStop ajaxComplete ajaxError ajaxSuccess ajaxSend".split(" "), function(i,o){
	jQuery.fn[o] = function(f){
		return this.bind(o, f);
	};
});

jQuery.each( [ "GET", "POST" ], function( i, method ) {
	jQuery[ method.toLowerCase() ] = function( url, data, callback, type ) {
		// shift arguments if data argument was omited
		if ( jQuery.isFunction( data ) ) {
			type = type || callback;
			callback = data;
			data = null;
		}

		return jQuery.ajax({
			type: method,
			url: url,
			data: data,
			success: callback,
			dataType: type
		});
	};
});

jQuery.extend({

	getScript: function( url, callback ) {
		return jQuery.get(url, null, callback, "script");
	},

	getJSON: function( url, data, callback ) {
		return jQuery.get(url, data, callback, "json");
	},

	ajaxSetup: function( settings ) {
		jQuery.extend( jQuery.ajaxSettings, settings );
	},

	ajaxSettings: {
		url: location.href,
		global: true,
		type: "GET",
		contentType: "application/x-www-form-urlencoded",
		processData: true,
		async: true,
		/*
		timeout: 0,
		data: null,
		dataType: null,
		dataTypes: null,
		username: null,
		password: null,
		cache: null,
		traditional: false,
		*/
		xhr: function() {
			return new window.XMLHttpRequest();
		},
		xhrResponseFields: {
			xml: "XML",
			text: "Text",
			json: "JSON"
		},
			
		accepts: {
			xml: "application/xml, text/xml",
			html: "text/html",
			text: "text/plain",
			json: "application/json, text/javascript",
			"*": "*/*"
		},
		
		autoDataType: {
			xml: /xml/,
			html: /html/,
			json: /json/
		},
		
		// Prefilters
		// 1) They are useful to introduce custom dataTypes (see transport/jsonp for an example)
		// 2) These are called:
		//    * BEFORE asking for a transport
		//    * AFTER param serialization (s.data is a string if s.processData is true)
		// 3) They MUST be order agnostic
		prefilters: [],
		
		// Transports bindings
		// 1) key is the dataType
		// 2) the catchall symbol "*" can be used
		// 3) selection will start with transport dataType and THEN go to "*" if needed
		transports: {
		},
		
		// Checkers
		// 1) key is dataType
		// 2) they are called to control successful response
		// 3) error throws is used as error data
		dataCheckers: {
	
			// Check if data is a string
			"text": function(data) {
				if ( typeof data != "string" ) {
					jQuery.error("typeerror");
				}
			},
	
			// Check if xml has been properly parsed
			"xml": function(data) {
				var documentElement = data ? data.documentElement : data;
				if ( ! documentElement || ! documentElement.nodeName ) {
					jQuery.error("typeerror");
				}
				if ( documentElement.nodeName == "parsererror" ) {
					jQuery.error("parsererror");
				}
			}
		},
		
		// List of data converters
		// 1) key format is "source_type => destination_type" (spaces required)
		// 2) the catchall symbol "*" can be used for source_type
		dataConverters: {
		
			// Convert anything to text
			"* => text": function(data) {
				return "" + data;
			},
			
			// Text to html (no transformation)
			"text => html": function(data) {
				return data;
			},
			
			// Evaluate text as a json expression
			"text => json": jQuery.parseJSON,
			
			// Parse text as xml
			"text => xml": function(data) {
				var xml, parser;
				if ( window.DOMParser ) { // Standard
					parser = new DOMParser();
					xml = parser.parseFromString(data,"text/xml");
				} else { // IE
					xml = new ActiveXObject("Microsoft.XMLDOM");
					xml.async="false";
					xml.loadXML(data);
				}
				return xml;
			}
		}
	},

	// Main method
	ajax: function( url , s ) {
		
		if ( arguments.length === 1 ) {
			s = url;
			url = s ? s.url : undefined;
		}
		
		return jQuery.xhr().open( s ? s.type : undefined , url ).send( undefined , s );
		
	},

	// Serialize an array of form elements or a set of
	// key/values into a query string
	param: function( a, traditional ) {
		var s = [],
			add = function( key, value ) {
				// If value is a function, invoke it and return its value
				value = jQuery.isFunction(value) ? value() : value;
				s[ s.length ] = encodeURIComponent(key) + "=" + encodeURIComponent(value);
			};
		
		// Set traditional to true for jQuery <= 1.3.2 behavior.
		if ( traditional === undefined ) {
			traditional = jQuery.ajaxSettings.traditional;
		}
		
		// If an array was passed in, assume that it is an array of form elements.
		if ( jQuery.isArray(a) || a.jquery ) {
			// Serialize the form elements
			jQuery.each( a, function() {
				add( this.name, this.value );
			});
			
		} else {
			// If traditional, encode the "old" way (the way 1.3.2 or older
			// did it), otherwise encode params recursively.
			for ( var prefix in a ) {
				buildParams( prefix, a[prefix], traditional, add );
			}
		}

		// Return the resulting serialization
		return s.join("&").replace(r20, "+");
	}
});

function buildParams( prefix, obj, traditional, add ) {
	if ( jQuery.isArray(obj) && obj.length ) {
		// Serialize array item.
		jQuery.each( obj, function( i, v ) {
			if ( traditional || rbracket.test( prefix ) ) {
				// Treat each array item as a scalar.
				add( prefix, v );

			} else {
				// If array item is non-scalar (array or object), encode its
				// numeric index to resolve deserialization ambiguity issues.
				// Note that rack (as of 1.0.0) can't currently deserialize
				// nested arrays properly, and attempting to do so may cause
				// a server error. Possible fixes are to modify rack's
				// deserialization algorithm or to provide an option or flag
				// to force array serialization to be shallow.
				buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v, traditional, add );
			}
		});
			
	} else if ( !traditional && obj != null && typeof obj === "object" ) {
		// If we see an array here, it is empty and should be treated as an empty
		// object
		if ( jQuery.isArray( obj ) || jQuery.isEmptyObject( obj ) ) {
			add( prefix, "" );

		// Serialize object item.
		} else {
			jQuery.each( obj, function( k, v ) {
				buildParams( prefix + "[" + k + "]", v, traditional, add );
			});
		}
					
	} else {
		// Serialize scalar item.
		add( prefix, obj );
	}
}

// This is still on the jQuery object... for now
// Want to move this to jQuery.ajax some day
jQuery.extend({

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

	// Last-Modified header cache for next request
	lastModified: {},
	etag: {}

});

/*
 * Create the request object; Microsoft failed to properly
 * implement the XMLHttpRequest in IE7 (can't request local files),
 * so we use the ActiveXObject when it is available
 * Additionally XMLHttpRequest can be disabled in IE7/IE8 so
 * we need a fallback.
 */
if ( window.ActiveXObject ) {
	jQuery.ajaxSettings.xhr = function() {
	if ( window.location.protocol !== "file:" ) {
		try {
			return new window.XMLHttpRequest();
		} catch( xhrError ) {}
	}
	
	try {
		return new window.ActiveXObject("Microsoft.XMLHTTP");
	} catch( activeError ) {}
	};
}

var testXHR = jQuery.ajaxSettings.xhr();

// Does this browser support XHR requests?
jQuery.support.ajax = !!testXHR;

// Does this browser support crossDomain XHR requests
jQuery.support.cors = testXHR && "withCredentials" in testXHR;

})( jQuery );