Can jQuery Abort In-Flight Ajax Requests?

Aborting Outstanding Ajax Requests with jQuery

Is it possible to cancel an Ajax request before its response is received? Yes, jQuery provides a straightforward method for this purpose.

In most cases, jQuery's Ajax methods return an XMLHttpRequest (or equivalent) object, which offers an "abort()" method. This allows you to prematurely terminate the request.

As demonstrated in the code snippet:

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()

Even with the later jQuery versions, this approach remains effective:

1. jQuery 1.5 and above: The returned object is now a wrapper for the native XMLHttpRequest object called jqXHR, which still exposes the "abort()" method.

2. jQuery 3 and above: The ajax method returns a promise with additional methods, including "abort()", so the code shown above is still applicable.

Note: Despite initial assumptions, "xhr.abort()" continues to function in jQuery 3.x. For more details, refer to the jQuery Github repository.

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