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Makes sure no unload handler is bound when not in IE. Also simplifies the whole "on unload abort" code. Also avoids the declaration of yet another variables in the jQuery main closure for the temporary XHR used to assess support properties.

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This commit is contained in:
jaubourg 2011-04-21 18:43:40 +02:00
parent 60cfab3d19
commit a28eadff48
1 changed files with 26 additions and 30 deletions
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44
src/ajax/xhr.js
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@ -1,21 +1,14 @@
(function( jQuery ) {
var // #5280: next active xhr id and list of active xhrs' callbacks
xhrId = jQuery.now(),
xhrCallbacks,
// XHR used to determine supports properties
testXHR;
// #5280: Internet Explorer will keep connections alive if we don't abort on unload
function xhrOnUnloadAbort() {
jQuery( window ).unload(function() {
var // #5280: Internet Explorer will keep connections alive if we don't abort on unload
xhrOnUnloadAbort = window.ActiveXObject ? function() {
// Abort all pending requests
for ( var key in xhrCallbacks ) {
xhrCallbacks[ key ]( 0, 1 );
}
});
}
} : false,
xhrId = 0,
xhrCallbacks;
// Functions to create xhrs
function createStandardXHR() {
@ -45,15 +38,13 @@ jQuery.ajaxSettings.xhr = window.ActiveXObject ?
// For all other browsers, use the standard XMLHttpRequest object
createStandardXHR;
// Test if we can create an xhr object
testXHR = jQuery.ajaxSettings.xhr();
jQuery.support.ajax = !!testXHR;
// Does this browser support crossDomain XHR requests
jQuery.support.cors = testXHR && ( "withCredentials" in testXHR );
// No need for the temporary xhr anymore
testXHR = undefined;
// Determine support properties
(function( xhr ) {
jQuery.extend( jQuery.support, {
ajax: !!xhr,
cors: !!xhr && ( "withCredentials" in xhr )
});
})( jQuery.ajaxSettings.xhr() );
// Create transport if the browser can provide an xhr
if ( jQuery.support.ajax ) {
@ -136,8 +127,10 @@ if ( jQuery.support.ajax ) {
// Do not keep as active anymore
if ( handle ) {
xhr.onreadystatechange = jQuery.noop;
if ( xhrOnUnloadAbort ) {
delete xhrCallbacks[ handle ];
}
}
// If it's an abort
if ( isAbort ) {
@ -197,15 +190,18 @@ if ( jQuery.support.ajax ) {
if ( !s.async || xhr.readyState === 4 ) {
callback();
} else {
handle = ++xhrId;
if ( xhrOnUnloadAbort ) {
// Create the active xhrs callbacks list if needed
// and attach the unload handler
if ( !xhrCallbacks ) {
xhrCallbacks = {};
xhrOnUnloadAbort();
jQuery( window ).unload( xhrOnUnloadAbort );
}
// Add to list of active xhrs callbacks
handle = xhrId++;
xhr.onreadystatechange = xhrCallbacks[ handle ] = callback;
xhrCallbacks[ handle ] = callback;
}
xhr.onreadystatechange = callback;
}
},