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(function( jQuery ) {
var jsc = jQuery.now(),
jsre = /\=\?(&|$)/,
rquery_jsonp = /\?/;
// Default jsonp callback name
jQuery.ajaxSettings.jsonpCallback = function() {
return "jsonp" + jsc++;
};
// Normalize jsonp queries
// 1) put callback parameter in url or data
// 2) ensure transportDataType is json
// 3) ensure options jsonp is always provided so that jsonp requests are always
// json request with the jsonp option set
jQuery.xhr.prefilter( function(s) {
var transportDataType = s.dataTypes[0];
if ( s.jsonp ||
transportDataType === "jsonp" ||
transportDataType === "json" && ( jsre.test(s.url) || typeof(s.data) === "string" && jsre.test(s.data) ) ) {
var jsonp = s.jsonp = s.jsonp || "callback",
jsonpCallback = s.jsonpCallback =
jQuery.isFunction( s.jsonpCallback ) ? s.jsonpCallback() : s.jsonpCallback,
url = s.url.replace(jsre, "=" + jsonpCallback + "$1"),
data = s.url == url && typeof(s.data) === "string" ? s.data.replace(jsre, "=" + jsonpCallback + "$1") : s.data;
if ( url == s.url && data == s.data ) {
url = url += (rquery_jsonp.test( url ) ? "&" : "?") + jsonp + "=" + jsonpCallback;
}
s.url = url;
s.data = data;
s.dataTypes[0] = "json";
}
});
// Bind transport to json dataType
jQuery.xhr.bindTransport("json", function(s) {
if ( s.jsonp ) {
// Put callback in place
var responseContainer,
jsonpCallback = s.jsonpCallback,
previous = window[ jsonpCallback ];
window [ jsonpCallback ] = function( response ) {
responseContainer = [response];
};
s.complete = [function() {
// Set callback back to previous value
window[ jsonpCallback ] = previous;
// Call if it was a function and we have a response
if ( previous) {
if ( responseContainer && jQuery.isFunction ( previous ) ) {
window[ jsonpCallback ] ( responseContainer[0] );
}
} else {
// else, more memory leak avoidance
try{ delete window[ jsonpCallback ]; } catch(e){}
}
}, s.complete ];
// Use data converter to retrieve json after script execution
s.dataConverters["script => json"] = function() {
if ( ! responseContainer ) {
jQuery.error("Callback '" + jsonpCallback + "' was not called");
}
return responseContainer[ 0 ];
};
// Delegate to script transport
return "script";
}
});
})( jQuery );
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