jQuery | ajaxStart() Method

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.

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<!DOCTYPE html>
<html>
  
<head>
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
    </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>

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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.











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                                    edit

                                    close




                                    play_arrow




                                    link

                                    brightness_4

                                    code
                                




















<!DOCTYPE html> 


<html> 


  


<head> 


    <script src= 


"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"> 


    </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> 



















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Output:


    

  • 
Before click on the button
    


    • 

  • 
After click on the button
    

    


    • 






    

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