Ajax methods

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

Issuing requests

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

Request monitoring

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

Configuration

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

Utilities

Ajax method	Description
.serialize()	Encodes the values of a set of form controls into a query string.
.serializeArray()	Encodes the values of a set of form controls into a JavaScript data structure.
$.param(obj)	Encodes an arbitrary object of key-value pairs into a query string.
$.globalEval(code)	Evaluates the given JavaScript string in the global context.
$.parseJSON(json)	Converts the given JSON string into a JavaScript object.
$.parseXML(xml)	Converts the given XML string into an XML document.
$.parseHTML(html)	Converts the given HTML string into a set of DOM elements.