src/ajax/jsonp.js

   1 (function( jQuery ) {
   2
   3 var jsc = jQuery.now(),
   4         jsre = /(\=)\?(&|$)|()\?\?()/i;
   5
   6 // Default jsonp settings
   7 jQuery.ajaxSetup({
   8         jsonp: "callback",
   9         jsonpCallback: function() {
  10                 return "jsonp" + jsc++;
  11         }
  12 });
  13
  14 // Detect, normalize options and install callbacks for jsonp requests
  15 jQuery.ajaxPrefilter( "json jsonp", function( s, originalSettings, dataIsString /* internal */ ) {
  16
  17         dataIsString = ( typeof s.data === "string" );
  18
  19         if ( s.dataTypes[ 0 ] === "jsonp" ||
  20                 originalSettings.jsonpCallback ||
  21                 originalSettings.jsonp != null ||
  22                 s.jsonp !== false && ( jsre.test( s.url ) ||
  23                                 dataIsString && jsre.test( s.data ) ) ) {
  24
  25                 var responseContainer,
  26                         jsonpCallback = s.jsonpCallback =
  27                                 jQuery.isFunction( s.jsonpCallback ) ? s.jsonpCallback() : s.jsonpCallback,
  28                         previous = window[ jsonpCallback ],
  29                         url = s.url,
  30                         data = s.data,
  31                         replace = "$1" + jsonpCallback + "$2";
  32
  33                 if ( s.jsonp !== false ) {
  34                         url = url.replace( jsre, replace );
  35                         if ( s.url === url ) {
  36                                 if ( dataIsString ) {
  37                                         data = data.replace( jsre, replace );
  38                                 }
  39                                 if ( s.data === data ) {
  40                                         // Add callback manually
  41                                         url += (/\?/.test( url ) ? "&" : "?") + s.jsonp + "=" + jsonpCallback;
  42                                 }
  43                         }
  44                 }
  45
  46                 s.url = url;
  47                 s.data = data;
  48
  49                 window[ jsonpCallback ] = function( response ) {
  50                         responseContainer = [ response ];
  51                 };
  52
  53                 s.complete = [ function() {
  54
  55                         // Set callback back to previous value
  56                         window[ jsonpCallback ] = previous;
  57
  58                         // Call if it was a function and we have a response
  59                         if ( previous) {
  60                                 if ( responseContainer && jQuery.isFunction( previous ) ) {
  61                                         window[ jsonpCallback ] ( responseContainer[ 0 ] );
  62                                 }
  63                         } else {
  64                                 // else, more memory leak avoidance
  65                                 try{
  66                                         delete window[ jsonpCallback ];
  67                                 } catch( e ) {}
  68                         }
  69
  70                 }, s.complete ];
  71
  72                 // Use data converter to retrieve json after script execution
  73                 s.converters["script json"] = function() {
  74                         if ( ! responseContainer ) {
  75                                 jQuery.error( jsonpCallback + " was not called" );
  76                         }
  77                         return responseContainer[ 0 ];
  78                 };
  79
  80                 // force json dataType
  81                 s.dataTypes[ 0 ] = "json";
  82
  83                 // Delegate to script
  84                 return "script";
  85         }
  86 } );
  87
  88 })( jQuery );