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src/ajax/jsonp.js
Maintainability
65.43
Lines of code
102
Difficulty
26.17
Estimated Errors
0.62
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define( [ "../core", "./var/nonce", "./var/rquery", "../ajax" ], function( jQuery, nonce, rquery ) { "use strict"; var oldCallbacks = [], rjsonp = /(=)\?(?=&|$)|\?\?/; // Default jsonp settings jQuery.ajaxSetup( { jsonp: "callback", jsonpCallback: function() { var callback = oldCallbacks.pop() || ( jQuery.expando + "_" + ( nonce++ ) ); this[ callback ] = true; return callback; } } ); // Detect, normalize options and install callbacks for jsonp requests jQuery.ajaxPrefilter( "json jsonp", function( s, originalSettings, jqXHR ) { var callbackName, overwritten, responseContainer, jsonProp = s.jsonp !== false && ( rjsonp.test( s.url ) ? "url" : typeof s.data === "string" && ( s.contentType || "" ) .indexOf( "application/x-www-form-urlencoded" ) === 0 && rjsonp.test( s.data ) && "data" ); // Handle iff the expected data type is "jsonp" or we have a parameter to set if ( jsonProp || s.dataTypes[ 0 ] === "jsonp" ) { // Get callback name, remembering preexisting value associated with it callbackName = s.jsonpCallback = jQuery.isFunction( s.jsonpCallback ) ? s.jsonpCallback() : s.jsonpCallback; // Insert callback into url or form data if ( jsonProp ) { s[ jsonProp ] = s[ jsonProp ].replace( rjsonp, "$1" + callbackName ); } else if ( s.jsonp !== false ) { s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.jsonp + "=" + callbackName; } // Use data converter to retrieve json after script execution s.converters[ "script json" ] = function() { if ( !responseContainer ) { jQuery.error( callbackName + " was not called" ); } return responseContainer[ 0 ]; }; // Force json dataType s.dataTypes[ 0 ] = "json"; // Install callback overwritten = window[ callbackName ]; window[ callbackName ] = function() { responseContainer = arguments; }; // Clean-up function (fires after converters) jqXHR.always( function() { // If previous value didn't exist - remove it if ( overwritten === undefined ) { jQuery( window ).removeProp( callbackName ); // Otherwise restore preexisting value } else { window[ callbackName ] = overwritten; } // Save back as free if ( s[ callbackName ] ) { // Make sure that re-using the options doesn't screw things around s.jsonpCallback = originalSettings.jsonpCallback; // Save the callback name for future use oldCallbacks.push( callbackName ); } // Call if it was a function and we have a response if ( responseContainer && jQuery.isFunction( overwritten ) ) { overwritten( responseContainer[ 0 ] ); } responseContainer = overwritten = undefined; } ); // Delegate to script return "script"; } } ); } );