Ajax fundamentals

to use ajax this script is mandatory


<script type="text/javascript">

function ajaxFunction()


var xmlhttp;

if (window.XMLHttpRequest)


  // code for IE7+, Firefox, Chrome, Opera, Safari

  xmlhttp=new XMLHttpRequest();


else if (window.ActiveXObject)


  // code for IE6, IE5

  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");




  alert("Your browser does not support XMLHTTP!");




<form name="myForm">

Name: <input type="text" name="username" />

Time: <input type="text" name="time" />


Example explained

1. Create a variable named xmlhttp to hold the XMLHttpRequest object.
2. Try to create the XMLHttpRequest object with xmlhttp=new XMLHttpRequest().
3. If that fails, try xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"). This is for IE6 and IE5.
4. If that fails too, the user has a very outdated browser, and will get an alert stating that the browser doesn't support XMLHTTP.
Note: The code above can be used every time you need to create an XMLHttpRequest object, so just copy and paste it whenever you need it.
 Source: http://www.w3schools.com/Ajax
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