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.extend({
 117
 118         get: function( url, data, callback, type ) {
 119                 // shift arguments if data argument was omited
 120                 if ( jQuery.isFunction( data ) ) {
 121                         type = type || callback;
 122                         callback = data;
 123                         data = null;
 124                 }
 125
 126                 return jQuery.ajax({
 127                         type: "GET",
 128                         url: url,
 129                         data: data,
 130                         success: callback,
 131                         dataType: type
 132                 });
 133         },
 134
 135         getScript: function( url, callback ) {
 136                 return jQuery.get(url, null, callback, "script");
 137         },
 138
 139         getJSON: function( url, data, callback ) {
 140                 return jQuery.get(url, data, callback, "json");
 141         },
 142
 143         post: function( url, data, callback, type ) {
 144                 // shift arguments if data argument was omited
 145                 if ( jQuery.isFunction( data ) ) {
 146                         type = type || callback;
 147                         callback = data;
 148                         data = {};
 149                 }
 150
 151                 return jQuery.ajax({
 152                         type: "POST",
 153                         url: url,
 154                         data: data,
 155                         success: callback,
 156                         dataType: type
 157                 });
 158         },
 159
 160         ajaxSetup: function( settings ) {
 161                 jQuery.extend( jQuery.ajaxSettings, settings );
 162         },
 163
 164         ajaxSettings: {
 165                 url: location.href,
 166                 global: true,
 167                 type: "GET",
 168                 contentType: "application/x-www-form-urlencoded",
 169                 processData: true,
 170                 async: true,
 171                 /*
 172                 timeout: 0,
 173                 data: null,
 174                 dataType: null,
 175                 dataTypes: null,
 176                 username: null,
 177                 password: null,
 178                 cache: null,
 179                 traditional: false,
 180                 */
 181                 xhr: function() {
 182                         return new window.XMLHttpRequest();
 183                 },
 184
 185                 accepts: {
 186                         xml: "application/xml, text/xml",
 187                         html: "text/html",
 188                         text: "text/plain",
 189                         json: "application/json, text/javascript",
 190                         "*": "*/*"
 191                 },
 192
 193                 autoDataType: {
 194                         xml: /xml/,
 195                         html: /html/,
 196                         json: /json/
 197                 },
 198
 199                 // Prefilters
 200                 // 1) They are useful to introduce custom dataTypes (see transport/jsonp for an example)
 201                 // 2) These are called:
 202                 //    * BEFORE asking for a transport
 203                 //    * AFTER param serialization (s.data is a string if s.processData is true)
 204                 // 3) key is the dataType
 205                 // 4) the catchall symbol "*" can be used
 206                 // 5) execution will start with transport dataType and THEN continue down to "*" if needed
 207                 prefilters: {},
 208
 209                 // Transports bindings
 210                 // 1) key is the dataType
 211                 // 2) the catchall symbol "*" can be used
 212                 // 3) selection will start with transport dataType and THEN go to "*" if needed
 213                 transports: {},
 214
 215                 // Checkers
 216                 // 1) key is dataType
 217                 // 2) they are called to control successful response
 218                 // 3) error throws is used as error data
 219                 dataCheckers: {
 220
 221                         // Check if data is a string
 222                         "text": function(data) {
 223                                 if ( typeof data != "string" ) {
 224                                         jQuery.error("typeerror");
 225                                 }
 226                         },
 227
 228                         // Check if xml has been properly parsed
 229                         "xml": function(data) {
 230                                 var documentElement = data ? data.documentElement : data;
 231                                 if ( ! documentElement || ! documentElement.nodeName ) {
 232                                         jQuery.error("typeerror");
 233                                 }
 234                                 if ( documentElement.nodeName == "parsererror" ) {
 235                                         jQuery.error("parsererror");
 236                                 }
 237                         }
 238                 },
 239
 240                 // List of data converters
 241                 // 1) key format is "source_type => destination_type" (spaces required)
 242                 // 2) the catchall symbol "*" can be used for source_type
 243                 dataConverters: {
 244
 245                         // Convert anything to text
 246                         "* => text": function(data) {
 247                                 return "" + data;
 248                         },
 249
 250                         // Text to html (no transformation)
 251                         "text => html": function(data) {
 252                                 return data;
 253                         },
 254
 255                         // Evaluate text as a json expression
 256                         "text => json": jQuery.parseJSON,
 257
 258                         // Parse text as xml
 259                         "text => xml": function(data) {
 260                                 var xml, parser;
 261                                 if ( window.DOMParser ) { // Standard
 262                                         parser = new DOMParser();
 263                                         xml = parser.parseFromString(data,"text/xml");
 264                                 } else { // IE
 265                                         xml = new ActiveXObject("Microsoft.XMLDOM");
 266                                         xml.async="false";
 267                                         xml.loadXML(data);
 268                                 }
 269                                 return xml;
 270                         }
 271                 }
 272         },
 273
 274         // Main method
 275         ajax: function( url , s ) {
 276
 277                 if ( arguments.length === 1 ) {
 278                         s = url;
 279                         url = s ? s.url : undefined;
 280                 }
 281
 282                 return jQuery.xhr().open( s ? s.type : undefined , url ).send( undefined , s );
 283
 284         },
 285
 286         // Serialize an array of form elements or a set of
 287         // key/values into a query string
 288         param: function( a, traditional ) {
 289                 var s = [],
 290                         add = function( key, value ) {
 291                                 // If value is a function, invoke it and return its value
 292                                 value = jQuery.isFunction(value) ? value() : value;
 293                                 s[ s.length ] = encodeURIComponent(key) + "=" + encodeURIComponent(value);
 294                         };
 295
 296                 // Set traditional to true for jQuery <= 1.3.2 behavior.
 297                 if ( traditional === undefined ) {
 298                         traditional = jQuery.ajaxSettings.traditional;
 299                 }
 300
 301                 // If an array was passed in, assume that it is an array of form elements.
 302                 if ( jQuery.isArray(a) || a.jquery ) {
 303                         // Serialize the form elements
 304                         jQuery.each( a, function() {
 305                                 add( this.name, this.value );
 306                         });
 307
 308                 } else {
 309                         // If traditional, encode the "old" way (the way 1.3.2 or older
 310                         // did it), otherwise encode params recursively.
 311                         for ( var prefix in a ) {
 312                                 buildParams( prefix, a[prefix], traditional, add );
 313                         }
 314                 }
 315
 316                 // Return the resulting serialization
 317                 return s.join("&").replace(r20, "+");
 318         }
 319 });
 320
 321 function buildParams( prefix, obj, traditional, add ) {
 322         if ( jQuery.isArray(obj) && obj.length ) {
 323                 // Serialize array item.
 324                 jQuery.each( obj, function( i, v ) {
 325                         if ( traditional || rbracket.test( prefix ) ) {
 326                                 // Treat each array item as a scalar.
 327                                 add( prefix, v );
 328
 329                         } else {
 330                                 // If array item is non-scalar (array or object), encode its
 331                                 // numeric index to resolve deserialization ambiguity issues.
 332                                 // Note that rack (as of 1.0.0) can't currently deserialize
 333                                 // nested arrays properly, and attempting to do so may cause
 334                                 // a server error. Possible fixes are to modify rack's
 335                                 // deserialization algorithm or to provide an option or flag
 336                                 // to force array serialization to be shallow.
 337                                 buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v, traditional, add );
 338                         }
 339                 });
 340
 341         } else if ( !traditional && obj != null && typeof obj === "object" ) {
 342                 // If we see an array here, it is empty and should be treated as an empty
 343                 // object
 344                 if ( jQuery.isArray( obj ) || jQuery.isEmptyObject( obj ) ) {
 345                         add( prefix, "" );
 346
 347                 // Serialize object item.
 348                 } else {
 349                         jQuery.each( obj, function( k, v ) {
 350                                 buildParams( prefix + "[" + k + "]", v, traditional, add );
 351                         });
 352                 }
 353
 354         } else {
 355                 // Serialize scalar item.
 356                 add( prefix, obj );
 357         }
 358 }
 359
 360 // This is still on the jQuery object... for now
 361 // Want to move this to jQuery.ajax some day
 362 jQuery.extend({
 363
 364         // Counter for holding the number of active queries
 365         active: 0,
 366
 367         // Last-Modified header cache for next request
 368         lastModified: {},
 369         etag: {}
 370
 371 });
 372
 373 /*
 374  * Create the request object; Microsoft failed to properly
 375  * implement the XMLHttpRequest in IE7 (can't request local files),
 376  * so we use the ActiveXObject when it is available
 377  * Additionally XMLHttpRequest can be disabled in IE7/IE8 so
 378  * we need a fallback.
 379  */
 380 if ( window.ActiveXObject ) {
 381         jQuery.ajaxSettings.xhr = function() {
 382         if ( window.location.protocol !== "file:" ) {
 383                 try {
 384                         return new window.XMLHttpRequest();
 385                 } catch( xhrError ) {}
 386         }
 387
 388         try {
 389                 return new window.ActiveXObject("Microsoft.XMLHTTP");
 390         } catch( activeError ) {}
 391         };
 392 }
 393
 394 var testXHR = jQuery.ajaxSettings.xhr();
 395
 396 // Does this browser support XHR requests?
 397 jQuery.support.ajax = !!testXHR;
 398
 399 // Does this browser support crossDomain XHR requests
 400 jQuery.support.cors = testXHR && "withCredentials" in testXHR;
 401
 402 })( jQuery );