src/transports/jsonp.js

   1 (function( jQuery ) {
   2
   3 var jsc = jQuery.now(),
   4         jsre = /\=\?(&|$)/,
   5         rquery_jsonp = /\?/;
   6
   7 // Default jsonp callback name
   8 jQuery.ajaxSettings.jsonpCallback = function() {
   9         return "jsonp" + jsc++;
  10 };
  11
  12 // Normalize jsonp queries
  13 // 1) put callback parameter in url or data
  14 // 2) ensure transportDataType is json
  15 // 3) ensure options jsonp is always provided so that jsonp requests are always
  16 //    json request with the jsonp option set
  17 jQuery.xhr.prefilter( function(s) {
  18
  19         var transportDataType = s.dataTypes[0];
  20
  21         if ( s.jsonp ||
  22                 transportDataType === "jsonp" ||
  23                 transportDataType === "json" && ( jsre.test(s.url) || typeof(s.data) === "string" && jsre.test(s.data) ) ) {
  24
  25                 var jsonp = s.jsonp = s.jsonp || "callback",
  26                         jsonpCallback = s.jsonpCallback =
  27                                 jQuery.isFunction( s.jsonpCallback ) ? s.jsonpCallback() : s.jsonpCallback,
  28                         url = s.url.replace(jsre, "=" + jsonpCallback + "$1"),
  29                         data = s.url == url && typeof(s.data) === "string" ? s.data.replace(jsre, "=" + jsonpCallback + "$1") : s.data;
  30
  31                 if ( url == s.url && data == s.data ) {
  32                         url = url += (rquery_jsonp.test( url ) ? "&" : "?") + jsonp + "=" + jsonpCallback;
  33                 }
  34
  35                 s.url = url;
  36                 s.data = data;
  37
  38                 s.dataTypes[0] = "json";
  39         }
  40
  41 });
  42
  43 // Bind transport to json dataType
  44 jQuery.xhr.bindTransport("json", function(s) {
  45
  46         if ( s.jsonp ) {
  47
  48                 // Put callback in place
  49                 var responseContainer,
  50                         jsonpCallback = s.jsonpCallback,
  51                         previous = window[ jsonpCallback ];
  52
  53                 window [ jsonpCallback ] = function( response ) {
  54                         responseContainer = [response];
  55                 };
  56
  57                 s.complete = [function() {
  58
  59                         // Set callback back to previous value
  60                         window[ jsonpCallback ] = previous;
  61
  62                         // Call if it was a function and we have a response
  63                         if ( previous) {
  64                                 if ( responseContainer && jQuery.isFunction ( previous ) ) {
  65                                         window[ jsonpCallback ] ( responseContainer[0] );
  66                                 }
  67                         } else {
  68                                 // else, more memory leak avoidance
  69                                 try{ delete window[ jsonpCallback ]; } catch(e){}
  70                         }
  71
  72                 }, s.complete ];
  73
  74                 // Use data converter to retrieve json after script execution
  75                 s.dataConverters["script => json"] = function() {
  76                         if ( ! responseContainer ) {
  77                                 jQuery.error("Callback '" + jsonpCallback + "' was not called");
  78                         }
  79                         return responseContainer[ 0 ];
  80                 };
  81
  82                 // Delegate to script transport
  83                 return "script";
  84
  85         }
  86
  87 });
  88
  89 })( jQuery );