AJAX
AJAX
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

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Asynchronous JavaScript and XML
Art of exchanging data with a server and
updating parts of a web page.
N...
How AJAX works ???


AJAX is based on internet standards, and
uses a combination of:

XMLHttpRequest object (to exchange data
asynchronously...
The XMLHttpRequest Object


The keystone of AJAX is the XMLHttpRequest
object.



All
modern
browsers
support
the
XMLHtt...
Create an XMLHttpRequest Object


All modern browsers (IE7+, Firefox,
Chrome, Safari, and Opera) have a builtin XMLHttpRe...


To handle all modern browsers, including IE5 and IE6,
check if the browser supports the XMLHttpRequest
object.



If i...
Send a Request to a Server


To send a request to a server, we use the
open() and send() methods of the
XMLHttpRequest ob...
The onreadystatechange event
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Ajax

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Ajax

  1. 1. AJAX
  2. 2. AJAX       Asynchronous JavaScript and XML Art of exchanging data with a server and updating parts of a web page. No need to reload entire page. Technique for creating fast and dynamic web pages. Examples: Google Maps, Gmail, Youtube, and Facebook tabs AJAX was made popular in 2005 by Google, with Google Suggest.
  3. 3. How AJAX works ???
  4. 4.  AJAX is based on internet standards, and uses a combination of: XMLHttpRequest object (to exchange data asynchronously with a server)  JavaScript/DOM (to display/interact with the information)  CSS (to style the data)  XML (often used as the format for transferring data) 
  5. 5. The XMLHttpRequest Object  The keystone of AJAX is the XMLHttpRequest object.  All modern browsers support the XMLHttpRequest object (IE5 and IE6 use an ActiveXObject).  The XMLHttpRequest object is used to exchange data with a server behind the scenes.  This means that it is possible to update parts of a web page, without reloading the whole page.
  6. 6. Create an XMLHttpRequest Object  All modern browsers (IE7+, Firefox, Chrome, Safari, and Opera) have a builtin XMLHttpRequest object.   Syntax: variable=new XMLHttpRequest();  Old versions of Internet Explorer (IE5 and IE6) uses an ActiveX Object:  variable=new ActiveXObject("Microsoft.XMLHTTP");`
  7. 7.  To handle all modern browsers, including IE5 and IE6, check if the browser supports the XMLHttpRequest object.  If it does, create an XMLHttpRequest object, if not, create an ActiveXObject:  Example: var xmlhttp; if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); }
  8. 8. Send a Request to a Server  To send a request to a server, we use the open() and send() methods of the XMLHttpRequest object: ◦ xmlhttp.open("GET","ajax_info.txt",true); xmlhttp.send()
  9. 9. The onreadystatechange event
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