src/ajax/jsonp.js

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