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AJAX is the art of exchanging data with a server, and updating parts of a web page - without reloading the whole page.
AJAX = Asynchronous JavaScript and XML.
In short; AJAX is about loading data in the background and display it on the webpage, without reloading the whole page.
Examples of applications using AJAX: Gmail, Google Maps, Youtube, and Facebook tabs.
jQuery provides several methods for AJAX functionality.
With the jQuery AJAX methods, you can request text, HTML, XML, or JSON from a remote server using both HTTP Get and HTTP Post - And you can load the external data directly into the selected HTML elements of your web page!
The following table lists all the jQuery AJAX methods:
| Method | Description |
|---|---|
| $.ajax() | Performs an async AJAX request |
| $.ajaxPrefilter() | Handle custom Ajax options or modify existing options before each request is sent and before they are processed by $.ajax() |
| $.ajaxSetup() | Sets the default values for future AJAX requests |
| $.ajaxTransport() | Creates an object that handles the actual transmission of Ajax data |
| $.get() | Loads data from a server using an AJAX HTTP GET request |
| $.getJSON() | Loads JSON-encoded data from a server using a HTTP GET request |
| $.parseJSON() | Deprecated in version 3.0, use JSON.parse() instead. Takes a well-formed JSON string and returns the resulting JavaScript value |
| $.getScript() | Loads (and executes) a JavaScript from a server using an AJAX HTTP GET request |
| $.param() | Creates a serialized representation of an array or object (can be used as URL query string for AJAX requests) |
| $.post() | Loads data from a server using an AJAX HTTP POST request |
| ajaxComplete() | Specifies a function to run when the AJAX request completes |
| ajaxError() | Specifies a function to run when the AJAX request completes with an error |
| ajaxSend() | Specifies a function to run before the AJAX request is sent |
| ajaxStart() | Specifies a function to run when the first AJAX request begins |
| ajaxStop() | Specifies a function to run when all AJAX requests have completed |
| ajaxSuccess() | Specifies a function to run when an AJAX request completes successfully |
| load() | Loads data from a server and puts the returned data into the selected element |
| serialize() | Encodes a set of form elements as a string for submission |
| serializeArray() | Encodes a set of form elements as an array of names and values |
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