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No ticket: Small ajax/xhr size optimizations

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This commit is contained in:
Richard Gibson 2013-10-28 17:41:34 -04:00
parent f9d41ac641
commit 705216dc46
1 changed files with 19 additions and 6 deletions
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25
src/ajax/xhr.js
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@ -10,7 +10,8 @@ jQuery.ajaxSettings.xhr = function() {
} catch( e ) {}
};
var xhrSupported = jQuery.ajaxSettings.xhr(),
var xhrId = 0,
xhrCallbacks = {},
xhrSuccessStatus = {
// file protocol always yields status code 0, assume 200
0: 200,
@ -18,8 +19,7 @@ var xhrSupported = jQuery.ajaxSettings.xhr(),
// #1450: sometimes IE returns 1223 when it should be 204
1223: 204
},
xhrId = 0,
xhrCallbacks = {};
xhrSupported = jQuery.ajaxSettings.xhr();
// Support: IE9
// Open requests must be manually aborted on unload (#5280)
@ -36,23 +36,29 @@ support.ajax = xhrSupported = !!xhrSupported;
jQuery.ajaxTransport(function( options ) {
var callback;
// Cross domain only allowed if supported through XMLHttpRequest
if ( support.cors || xhrSupported && !options.crossDomain ) {
return {
send: function( headers, complete ) {
var i, id,
xhr = options.xhr();
var i,
xhr = options.xhr(),
id = ++xhrId;
xhr.open( options.type, options.url, options.async, options.username, options.password );
// Apply custom fields if provided
if ( options.xhrFields ) {
for ( i in options.xhrFields ) {
xhr[ i ] = options.xhrFields[ i ];
}
}
// Override mime type if needed
if ( options.mimeType && xhr.overrideMimeType ) {
xhr.overrideMimeType( options.mimeType );
}
// X-Requested-With header
// For cross-domain requests, seeing as conditions for a preflight are
// akin to a jigsaw puzzle, we simply never set it to be sure.
@ -61,16 +67,19 @@ jQuery.ajaxTransport(function( options ) {
if ( !options.crossDomain && !headers["X-Requested-With"] ) {
headers["X-Requested-With"] = "XMLHttpRequest";
}
// Set headers
for ( i in headers ) {
xhr.setRequestHeader( i, headers[ i ] );
}
// Callback
callback = function( type ) {
return function() {
if ( callback ) {
delete xhrCallbacks[ id ];
callback = xhr.onload = xhr.onerror = null;
if ( type === "abort" ) {
xhr.abort();
} else if ( type === "error" ) {
@ -95,16 +104,20 @@ jQuery.ajaxTransport(function( options ) {
}
};
};
// Listen to events
xhr.onload = callback();
xhr.onerror = callback("error");
// Create the abort callback
callback = xhrCallbacks[( id = xhrId++ )] = callback("abort");
callback = xhrCallbacks[ id ] = callback("abort");
// Do send the request
// This may raise an exception which is actually
// handled in jQuery.ajax (so no try/catch here)
xhr.send( options.hasContent && options.data || null );
},
abort: function() {
if ( callback ) {
callback();