jQuery - ajaxStart( callback ) Method

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 = "https://www.tutorialspoint.com/jquery/jquery-3.6.0.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

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