Abort Ajax requests using jQuery

使用jQuery，我如何取消/中止我还没有收到响应的Ajax请求 ？

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Most of the jQuery Ajax methods return an XMLHttpRequest (or the equivalent) object, so you can just use abort() .

See the documentation:

abort Method (MSDN). Cancels the current HTTP request.

abort() (MDN). If the request has been sent already, this method will abort the request.

var xhr = $.ajax({
    type: "POST",
    url: "some.php",
    data: "name=John&location=Boston",
    success: function(msg){
       alert( "Data Saved: " + msg );
    }
});

//kill the request
xhr.abort()

UPDATE: As of jQuery 1.5 the returned object is a wrapper for the native XMLHttpRequest object called jqXHR. This object appears to expose all of the native properties and methods so the above example still works. See The jqXHR Object (jQuery API documentation).

UPDATE 2: As of jQuery 3, the ajax method returns a promise without extra methods (like abort), so this will no longer work. See the 3.0 blog here. One way around this is to control the xhr object through the xhr property. Here is a crude example:

var xhr = new window.XMLHttpRequest();
var request = $.ajax({
    url : url,
    xhr : function(){
        return xhr;
    }
});
xhr.abort();

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You can't recall the request but you can set a timeout value after which the response will be ignored. See this page for jquery AJAX options. I believe that your error callback will be called if the timeout period is exceeded. There is already a default timeout on every AJAX request.

You can also use the abort() method on the request object but, while it will cause the client to stop listening for the event, it may probably will not stop the server from processing it.

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It's an asynchronous request, meaning once it's sent it's out there.

In case your server is starting a very expensive operation due to the AJAX request, the best you can do is open your server to listen for cancel requests, and send a separate AJAX request notifying the server to stop whatever it's doing.

Otherwise, simply ignore the AJAX response.

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