AJAX - Helper Functions

In addition to the low-level Ajax interface and shorthand methods, jQuery also provides several helper functions that can be used to perform more complex Ajax tasks. These functions are:

$.ajaxSetup() - This function is used to set default options for all Ajax requests. It takes an object as its argument, which can contain any of the options that can be passed to $.ajax(). These options will be applied to all subsequent Ajax requests.

$.ajaxPrefilter() - This function is used to modify the settings of an Ajax request before it is sent to the server. It takes a callback function as its argument, which can be used to modify the settings object.

$.ajaxTransport() - This function is used to define custom transports for Ajax requests. A transport is responsible for actually sending the request to the server and receiving the response. It takes a data type and a callback function as its arguments. The callback function should return an object that defines the methods send, abort, and getResponseHeader for the custom transport.

$.ajaxError() - This function is used to handle errors that occur during Ajax requests. It takes a callback function as its argument, which will be called whenever an error occurs.

$.ajaxComplete() - This function is used to handle the completion of Ajax requests, regardless of whether they succeeded or failed. It takes a callback function as its argument, which will be called whenever a request completes.

These functions provide additional flexibility and customization options for Ajax requests in jQuery. They can be used to set default options, modify request settings, define custom transports, and handle errors and completion events.