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jQuery | ajaxStart() Method
  • Last Updated : 28 Oct, 2019

The ajaxStart() method is used to specify function to be run when an AJAX request starts.
Syntax:

$(document).ajaxStart(function())

Parameter:: It takes only one parameter.

  • function(): It specifies the function to run when the Ajax request starts.

The demo.txt file stored on server and it will load after clicking the change content button.
The content of demo.txt are:
This is GFG.

Example-1: This example changes the content of < p > element, by taking the data from server. When the request starts the page says AJAX request started.




<!DOCTYPE html>
<html>
  
<head>
    <script src=
    </script>
    <script>
        $(document).ready(function() {
            $(document).ajaxStart(function() {
                alert("AJAX request started");
            });
            $("button").click(function() {
                $("#paragraph").load(
                  "demo.txt");
            });
        });
    </script>
    <style>
        body {
            text-align: center;
        }
    </style>
</head>
  
<body>
    <div id="div_content">
        <h1 style="color: green;">
          GeeksforGeeks</h1>
        <p id="paragraph" 
           style="font-size: 20px;">
            A computer science portal for geeks
        </p>
    </div>
    <button>Change Content
  </button>
</body>
  
</html>

Output:

  • Before click on the button
  • After click on the button

Example-2:This example changes the content of < h1 > element, by taking the data from server. When the request starts the page says AJAX request started.




<!DOCTYPE html>
<html>
  
<head>
    <script src=
    </script>
    <script>
        $(document).ready(function() {
            $(document).ajaxStart(function() {
                alert("AJAX request started");
            });
            $("button").click(function() {
                $("#paragraph").load(
                  "demo.txt");
            });
        });
    </script>
    <style>
        body {
            text-align: center;
        }
    </style>
</head>
  
<body>
    <div id="div_content">
        <h1 style="color: green;">
          GeeksforGeeks
      </h1>
        <p id="paragraph" 
           style="font-size: 20px;">
            A computer science
          portal for geeks
        </p>
    </div>
    <button>Change Content
  </button>
</body>
  
</html>

Output:

  • Before click on the button
  • After click on the button




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