Ajax methods

We can retrieve information from the server without requiring a page refresh by calling one of the following Ajax methods. Ajax methods are discussed in detail in Chapter 6.

Issuing requests

Ajax Method	Description
$.ajax(options)	Make an Ajax request using the provided set of options; this is a low-level method that is usually called through other convenience methods
.load(url, [data], [callback])	Make an Ajax request to url, and place the response into the matched elements
$.get(url, [data], [callback], [returnType])	Make an Ajax request to url using the GET method
$.getJSON(url, [data], [callback])	Make an Ajax request to url, interpreting the response as a JSON data structure
$.getScript(url, [callback])	Make an Ajax request to url, executing the response as JavaScript
$.post(url, [data], [callback], [returnType])	Make an Ajax request to url using the POST method

Request monitoring

Ajax Method	Description
.ajaxComplete(handler)	Bind handler to be called when any Ajax transaction completes
.ajaxError(handler)	Bind handler to be called when any Ajax transaction completes with an error
.ajaxSend(handler)	Bind handler to be called when any Ajax transaction begins
.ajaxStart(handler)	Bind handler to be called when any Ajax transaction begins, and no others are active
.ajaxStop(handler)	Bind handler to be called when any Ajax transaction ends, and no others are still active
.ajaxSuccess(handler)	Bind handler to be called when any Ajax transaction completes successfully

Configuration

Ajax Method	Description
$.ajaxSetup(options)	Set default options for all subsequent Ajax transactions
$.ajaxPrefilter([dataTypes], handler)	Modify the options on each Ajax request before it is processed by $.ajax()
$.ajaxTransport(transportFunction)	Define a new transport mechanism for Ajax transactions

Utilities

Ajax Method	Description
.serialize()	Encode the values of a set of form controls into a query string
.serializeArray()	Encode the values of a set of form controls into a JavaScript data structure
$.param(map)	Encode an arbitrary map of values into a query string
$.globalEval(code)	Evaluate the given JavaScript string in the global context
$.parseJSON(json)	Convert the given JSON string into a JavaScript object
$.parseXML(xml)	Convert the given XML string into an XML document