Reduced script transport

src/ajax/script.js

@@ -14,71 +14,45 @@ jQuery.ajaxSetup({
 	}
 });
 
-// Handle cache's special case and global
+// Handle cache's special case and crossDomain
 jQuery.ajaxPrefilter( "script", function( s ) {
 	if ( s.cache === undefined ) {
 		s.cache = false;
 	}
 	if ( s.crossDomain ) {
 		s.type = "GET";
-		s.global = false;
 	}
 });
 
 // Bind script tag hack transport
 jQuery.ajaxTransport( "script", function(s) {
-
 	// This transport only deals with cross domain requests
 	if ( s.crossDomain ) {
-
-		var script,
-			head = document.head || jQuery("head")[0] || document.documentElement;
-
+		var callback;
 		return {
-
-			send: function( _, callback ) {
-
-				script = document.createElement("script");
-
-				script.async = true;
-
-				if ( s.scriptCharset ) {
-					script.charset = s.scriptCharset;
-				}
-
-				script.src = s.url;
-
-				// Attach handlers for all browsers
-				script.onload = script.onreadystatechange = function( _, isAbort ) {
-
-					if ( isAbort || !script.readyState || /loaded|complete/.test( script.readyState ) ) {
-
-						// Handle memory leak in IE
-						script.onload = script.onreadystatechange = null;
-
-						// Remove the script
-						if ( script.parentNode ) {
-							script.parentNode.removeChild( script );
+			send: function( _, complete ) {
+				callback = function( type ) {
+					return function() {
+						callback = script.onload = script.onerror = null;
+						jQuery( script ).remove();
+						if ( type ) {
+							complete( type === "success" ? 200 : 404, type );
 						}
-
-						// Dereference the script
-						script = null;
-
-						// Callback if not abort
-						if ( !isAbort ) {
-							callback( 200, "success" );
-						}
-					}
+					};
 				};
-
-				// Circumvent IE6 bugs with base elements (#2709 and #4378) by prepending
-				// Use native DOM manipulation to avoid our domManip AJAX trickery
-				head.insertBefore( script, head.firstChild );
+				var script = jQuery.extend( document.createElement("script"), {
+						async: true,
+						charset: s.scriptCharset,
+						src: s.url,
+						onload: callback("success"),
+						onerror: callback("error")
+					});
+				callback = callback();
+				document.head.appendChild( script );
 			},
-
 			abort: function() {
-				if ( script ) {
-					script.onload( undefined, true );
+				if ( callback ) {
+					callback();
 				}
 			}
 		};