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This article will explain in detail what the ajax callback function is in jquery. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

Callback functions are: 1, beforeSend (), called before sending the request; 2, error (), called when the request goes wrong; 3, dataFilter (), called after the request is successful; 4, success (), called after the request; 5, complete (), called after the request is completed.

The operating environment of this tutorial: windows7 system, jquery1.10.2 version, Dell G3 computer.

The callback functions of ajax in jquery include: beforeSend, error, dataFilter, success, complete. The data obtained by $.ajax () can be processed in these callback functions.

BeforeSend

Called before the request is sent, passing in a XMLHttpRequest as an argument.

Error

Called when a request goes wrong. Pass in a XMLHttpRequest object, a string that describes the error type, and an exception object, if any.

DataFilter

Called after the request is successful. Pass in the returned data and the value of the "dataType" parameter. And the new data (which may be processed) must be returned and passed to the success callback function.

Success

Called after the request. Pass in the returned data and a string containing the success code.

Complete

This function is called when the request is completed, regardless of success or failure. Pass in a XMLHttpRequest object and a string containing a success or error code.

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