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This article mainly explains "how to use the jqXHR object of jQuery.get". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to use the jqXHR object of jQuery.get".

The jQuery 1.5 success callback function also passes a "jqXHR" object (in jQuery 1.4, it passes a XMLHttpRequest object). However, since the JSONP form and cross-domain GET requests do not use XHR, in these cases the jqXHR and textStatus parameters are passed to the success (successful) callback is undefined.

Most implementations will specify a successful callback handler:

$.get ('ajax/test.html', function (data) {

$('.result') .html (data)

Alert ('Load was performed.')

})

The HTML code snippet requested by this example is inserted in the page.

The jqXHR Object (jqXHR object)

Starting with jQuery 1.5, all jQuery's Ajax methods return a superset of XMLHTTPRequest objects. This jQuery XHR object, or "jqXHR," returned through the $. Get () method, implements the Promise interface so that it has all the properties, methods, and behaviors of Promise (see Deferred object for more information). The jqXHR.done () (for success), jqXHR.fail () (for error), and jqXHR.always () (for completion, success or error) methods accept a function argument to be called when the request is terminated. For more information about the parameters that this function receives, see the $.ajax () section in the jqXHR Object documentation.

The Promise interface also allows jQuery's Ajax methods, including $.get (), to be associated with .done (), .fail (), and .always () callbacks in a separate request, and even allows you to assign callbacks after the request has been completed. If the request has been completed, the callback function is called immediately.

/ / Assign handlers immediately after making the request

/ / and remember the jqxhr object for this request

Var jqxhr = $.get ("example.php", function () {

Alert ("success")

})

.success (function () {alert ("second success");})

.error (function () {alert ("error");})

.complete (function () {alert ("complete");})

/ / perform other work here...

/ / Set another completion function for the request above

Jqxhr.complete (function () {alert ("second complete");})

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