src/ajax/jsonp.js

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