jQuery - ajaxStart( callback ) Method


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Description

The ajaxStart( callback ) method attaches a function to be executed whenever an AJAX request begins and there is none already active. This is an Ajax Event.

Syntax

Here is the simple syntax to use this method −

$(document).ajaxStart( callback )

Parameters

Here is the description of all the parameters used by this method −

  • callback − The function to execute.

Example

Assuming we have following HTML content in result.html file −

<h1>THIS IS RESULT...</h1>

Following is a simple example a simple showing the usage of this method.

<html>
   <head>
      <title>The jQuery Example</title>
      <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
		
      <script type="text/javascript" language="javascript">
         $(document).ready(function() {
            /* Global variable */
            var count = 0;

            $("#driver").click(function(event){
               $('#stage1').load('result.html');
            });
            /* Gets called when request starts */
				
            $(document).ajaxStart(function(){
               count++;
               $("#stage2").html("<h1>Starts, Count :" + count + "</h1>");
            });
				
            /* Gets called when request complete */
            $(document).ajaxComplete(function(event,request,set){
               count++;
               $("#stage3").html("<h1>Completes,Count:" + count + "</h1>");
            });
         });
      </script>
		
   </head>
	
   <body>
	
      <p>Click on the button to load result.html file:</p>
		
      <div id="stage1" style="background-color:blue;">
         STAGE - 1
      </div>
		
      <div id="stage2" style="background-color:blue;">
         STAGE - 2
      </div>
		
      <div id="stage3" style="background-color:blue;">
         STAGE - 3
      </div>
		
      <input type="button" id="driver" value="Load Data" />
		
   </body>
	
</html>

This will produce following result −


jquery-ajax.htm