src/ajax.js

   1 (function( jQuery ) {
   2
   3 var rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi,
   4         rselectTextarea = /^(?:select|textarea)/i,
   5         rinput = /^(?:color|date|datetime|email|hidden|month|number|password|range|search|tel|text|time|url|week)$/i,
   6         rbracket = /\[\]$/,
   7         rquery = /\?/,
   8         r20 = /%20/g,
   9
  10         // Keep a copy of the old load method
  11         _load = jQuery.fn.load;
  12
  13 jQuery.fn.extend({
  14         load: function( url, params, callback ) {
  15                 if ( typeof url !== "string" && _load ) {
  16                         return _load.apply( this, arguments );
  17
  18                 // Don't do a request if no elements are being requested
  19                 } else if ( !this.length ) {
  20                         return this;
  21                 }
  22
  23                 var off = url.indexOf(" ");
  24                 if ( off >= 0 ) {
  25                         var selector = url.slice(off, url.length);
  26                         url = url.slice(0, off);
  27                 }
  28
  29                 // Default to a GET request
  30                 var type = "GET";
  31
  32                 // If the second parameter was provided
  33                 if ( params ) {
  34                         // If it's a function
  35                         if ( jQuery.isFunction( params ) ) {
  36                                 // We assume that it's the callback
  37                                 callback = params;
  38                                 params = null;
  39
  40                         // Otherwise, build a param string
  41                         } else if ( typeof params === "object" ) {
  42                                 params = jQuery.param( params, jQuery.ajaxSettings.traditional );
  43                                 type = "POST";
  44                         }
  45                 }
  46
  47                 var self = this;
  48
  49                 // Request the remote document
  50                 jQuery.ajax({
  51                         url: url,
  52                         type: type,
  53                         dataType: "html",
  54                         data: params,
  55                         complete: function( res, status ) {
  56                                 // If successful, inject the HTML into all the matched elements
  57                                 if ( status === "success" || status === "notmodified" ) {
  58                                         // See if a selector was specified
  59                                         self.html( selector ?
  60                                                 // Create a dummy div to hold the results
  61                                                 jQuery("<div>")
  62                                                         // inject the contents of the document in, removing the scripts
  63                                                         // to avoid any 'Permission Denied' errors in IE
  64                                                         .append(res.responseText.replace(rscript, ""))
  65
  66                                                         // Locate the specified elements
  67                                                         .find(selector) :
  68
  69                                                 // If not, just inject the full result
  70                                                 res.responseText );
  71                                 }
  72
  73                                 if ( callback ) {
  74                                         self.each( callback, [res.responseText, status, res] );
  75                                 }
  76                         }
  77                 });
  78
  79                 return this;
  80         },
  81
  82         serialize: function() {
  83                 return jQuery.param(this.serializeArray());
  84         },
  85
  86         serializeArray: function() {
  87                 return this.map(function(){
  88                         return this.elements ? jQuery.makeArray(this.elements) : this;
  89                 })
  90                 .filter(function(){
  91                         return this.name && !this.disabled &&
  92                                 (this.checked || rselectTextarea.test(this.nodeName) ||
  93                                         rinput.test(this.type));
  94                 })
  95                 .map(function(i, elem){
  96                         var val = jQuery(this).val();
  97
  98                         return val == null ?
  99                                 null :
 100                                 jQuery.isArray(val) ?
 101                                         jQuery.map( val, function(val, i){
 102                                                 return {name: elem.name, value: val};
 103                                         }) :
 104                                         {name: elem.name, value: val};
 105                 }).get();
 106         }
 107 });
 108
 109 // Attach a bunch of functions for handling common AJAX events
 110 jQuery.each( "ajaxStart ajaxStop ajaxComplete ajaxError ajaxSuccess ajaxSend".split(" "), function(i,o){
 111         jQuery.fn[o] = function(f){
 112                 return this.bind(o, f);
 113         };
 114 });
 115
 116 jQuery.each( [ "get", "post" ], function( i, method ) {
 117         jQuery[ method ] = function( url, data, callback, type ) {
 118                 // shift arguments if data argument was omited
 119                 if ( jQuery.isFunction( data ) ) {
 120                         type = type || callback;
 121                         callback = data;
 122                         data = null;
 123                 }
 124
 125                 return jQuery.ajax({
 126                         type: method,
 127                         url: url,
 128                         data: data,
 129                         success: callback,
 130                         dataType: type
 131                 });
 132         };
 133 });
 134
 135 jQuery.extend({
 136
 137         getScript: function( url, callback ) {
 138                 return jQuery.get(url, null, callback, "script");
 139         },
 140
 141         getJSON: function( url, data, callback ) {
 142                 return jQuery.get(url, data, callback, "json");
 143         },
 144
 145         ajaxSetup: function( settings ) {
 146                 jQuery.extend( jQuery.ajaxSettings, settings );
 147         },
 148
 149         ajaxSettings: {
 150                 url: location.href,
 151                 global: true,
 152                 type: "GET",
 153                 contentType: "application/x-www-form-urlencoded",
 154                 processData: true,
 155                 async: true,
 156                 /*
 157                 timeout: 0,
 158                 data: null,
 159                 dataType: null,
 160                 dataTypes: null,
 161                 username: null,
 162                 password: null,
 163                 cache: null,
 164                 traditional: false,
 165                 */
 166                 xhr: function() {
 167                         return new window.XMLHttpRequest();
 168                 },
 169                 xhrResponseFields: {
 170                         xml: "XML",
 171                         text: "Text",
 172                         json: "JSON"
 173                 },
 174
 175                 accepts: {
 176                         xml: "application/xml, text/xml",
 177                         html: "text/html",
 178                         text: "text/plain",
 179                         json: "application/json, text/javascript",
 180                         "*": "*/*"
 181                 },
 182
 183                 autoDataType: {
 184                         xml: /xml/,
 185                         html: /html/,
 186                         json: /json/
 187                 },
 188
 189                 // Prefilters
 190                 // 1) They are useful to introduce custom dataTypes (see transport/jsonp for an example)
 191                 // 2) These are called:
 192                 //    * BEFORE asking for a transport
 193                 //    * AFTER param serialization (s.data is a string if s.processData is true)
 194                 // 3) key is the dataType
 195                 // 4) the catchall symbol "*" can be used
 196                 // 5) execution will start with transport dataType and THEN continue down to "*" if needed
 197                 prefilters: {},
 198
 199                 // Transports bindings
 200                 // 1) key is the dataType
 201                 // 2) the catchall symbol "*" can be used
 202                 // 3) selection will start with transport dataType and THEN go to "*" if needed
 203                 transports: {},
 204
 205                 // Checkers
 206                 // 1) key is dataType
 207                 // 2) they are called to control successful response
 208                 // 3) error throws is used as error data
 209                 dataCheckers: {
 210
 211                         // Check if data is a string
 212                         "text": function(data) {
 213                                 if ( typeof data != "string" ) {
 214                                         jQuery.error("typeerror");
 215                                 }
 216                         },
 217
 218                         // Check if xml has been properly parsed
 219                         "xml": function(data) {
 220                                 var documentElement = data ? data.documentElement : data;
 221                                 if ( ! documentElement || ! documentElement.nodeName ) {
 222                                         jQuery.error("typeerror");
 223                                 }
 224                                 if ( documentElement.nodeName == "parsererror" ) {
 225                                         jQuery.error("parsererror");
 226                                 }
 227                         }
 228                 },
 229
 230                 // List of data converters
 231                 // 1) key format is "source_type => destination_type" (spaces required)
 232                 // 2) the catchall symbol "*" can be used for source_type
 233                 dataConverters: {
 234
 235                         // Convert anything to text
 236                         "* => text": function(data) {
 237                                 return "" + data;
 238                         },
 239
 240                         // Text to html (no transformation)
 241                         "text => html": function(data) {
 242                                 return data;
 243                         },
 244
 245                         // Evaluate text as a json expression
 246                         "text => json": jQuery.parseJSON,
 247
 248                         // Parse text as xml
 249                         "text => xml": function(data) {
 250                                 var xml, parser;
 251                                 if ( window.DOMParser ) { // Standard
 252                                         parser = new DOMParser();
 253                                         xml = parser.parseFromString(data,"text/xml");
 254                                 } else { // IE
 255                                         xml = new ActiveXObject("Microsoft.XMLDOM");
 256                                         xml.async="false";
 257                                         xml.loadXML(data);
 258                                 }
 259                                 return xml;
 260                         }
 261                 }
 262         },
 263
 264         // Main method
 265         ajax: function( url , s ) {
 266
 267                 if ( arguments.length === 1 ) {
 268                         s = url;
 269                         url = s ? s.url : undefined;
 270                 }
 271
 272                 return jQuery.xhr().open( s ? s.type : undefined , url ).send( undefined , s );
 273
 274         },
 275
 276         // Serialize an array of form elements or a set of
 277         // key/values into a query string
 278         param: function( a, traditional ) {
 279                 var s = [],
 280                         add = function( key, value ) {
 281                                 // If value is a function, invoke it and return its value
 282                                 value = jQuery.isFunction(value) ? value() : value;
 283                                 s[ s.length ] = encodeURIComponent(key) + "=" + encodeURIComponent(value);
 284                         };
 285
 286                 // Set traditional to true for jQuery <= 1.3.2 behavior.
 287                 if ( traditional === undefined ) {
 288                         traditional = jQuery.ajaxSettings.traditional;
 289                 }
 290
 291                 // If an array was passed in, assume that it is an array of form elements.
 292                 if ( jQuery.isArray(a) || a.jquery ) {
 293                         // Serialize the form elements
 294                         jQuery.each( a, function() {
 295                                 add( this.name, this.value );
 296                         });
 297
 298                 } else {
 299                         // If traditional, encode the "old" way (the way 1.3.2 or older
 300                         // did it), otherwise encode params recursively.
 301                         for ( var prefix in a ) {
 302                                 buildParams( prefix, a[prefix], traditional, add );
 303                         }
 304                 }
 305
 306                 // Return the resulting serialization
 307                 return s.join("&").replace(r20, "+");
 308         }
 309 });
 310
 311 function buildParams( prefix, obj, traditional, add ) {
 312         if ( jQuery.isArray(obj) && obj.length ) {
 313                 // Serialize array item.
 314                 jQuery.each( obj, function( i, v ) {
 315                         if ( traditional || rbracket.test( prefix ) ) {
 316                                 // Treat each array item as a scalar.
 317                                 add( prefix, v );
 318
 319                         } else {
 320                                 // If array item is non-scalar (array or object), encode its
 321                                 // numeric index to resolve deserialization ambiguity issues.
 322                                 // Note that rack (as of 1.0.0) can't currently deserialize
 323                                 // nested arrays properly, and attempting to do so may cause
 324                                 // a server error. Possible fixes are to modify rack's
 325                                 // deserialization algorithm or to provide an option or flag
 326                                 // to force array serialization to be shallow.
 327                                 buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v, traditional, add );
 328                         }
 329                 });
 330
 331         } else if ( !traditional && obj != null && typeof obj === "object" ) {
 332                 // If we see an array here, it is empty and should be treated as an empty
 333                 // object
 334                 if ( jQuery.isArray( obj ) || jQuery.isEmptyObject( obj ) ) {
 335                         add( prefix, "" );
 336
 337                 // Serialize object item.
 338                 } else {
 339                         jQuery.each( obj, function( k, v ) {
 340                                 buildParams( prefix + "[" + k + "]", v, traditional, add );
 341                         });
 342                 }
 343
 344         } else {
 345                 // Serialize scalar item.
 346                 add( prefix, obj );
 347         }
 348 }
 349
 350 // This is still on the jQuery object... for now
 351 // Want to move this to jQuery.ajax some day
 352 jQuery.extend({
 353
 354         // Counter for holding the number of active queries
 355         active: 0,
 356
 357         // Last-Modified header cache for next request
 358         lastModified: {},
 359         etag: {}
 360
 361 });
 362
 363 /*
 364  * Create the request object; Microsoft failed to properly
 365  * implement the XMLHttpRequest in IE7 (can't request local files),
 366  * so we use the ActiveXObject when it is available
 367  * Additionally XMLHttpRequest can be disabled in IE7/IE8 so
 368  * we need a fallback.
 369  */
 370 if ( window.ActiveXObject ) {
 371         jQuery.ajaxSettings.xhr = function() {
 372         if ( window.location.protocol !== "file:" ) {
 373                 try {
 374                         return new window.XMLHttpRequest();
 375                 } catch( xhrError ) {}
 376         }
 377
 378         try {
 379                 return new window.ActiveXObject("Microsoft.XMLHTTP");
 380         } catch( activeError ) {}
 381         };
 382 }
 383
 384 var testXHR = jQuery.ajaxSettings.xhr();
 385
 386 // Does this browser support XHR requests?
 387 jQuery.support.ajax = !!testXHR;
 388
 389 // Does this browser support crossDomain XHR requests
 390 jQuery.support.cors = testXHR && "withCredentials" in testXHR;
 391
 392 })( jQuery );