The ajaxSend() method in jQuery is used to specify the function to be run when an AJAX request is about to send.

Syntax:

$(document).ajaxSend( function(event, xhr, options) )

Parameters:

This method accepts a single parameter function which is mandatory. The function accepts three parameters as mentioned above and described below:

• event: It holds the event object.
• xhr: It holds the XMLHttpRequest object.
• options: It holds the used options in AJAX requests.

The demo.txt file stored on server and it will load after clicking the change content button.

demo.txt:

This is GFG.

Example 1: This example changes the content of

element, by taking the data from server. When the AJAX request is ready to send, the page says AJAX request is about to send.

<html>

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

    
    <script>
        $(document).ready(function () {
            $(document).ajaxSend(function () {
                alert("AJAX request is about to send");
            });

            $("button").click(function () {
                $("#paragraph").load("demo.txt");
            });
        });
    script>
head>

<body style="text-align:center;">

    <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:

Example 2: This example changes the content of

element, by taking the data from the server. When the AJAX request is ready to send, the page says AJAX request is about to send.

html

<html>

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

    
    <script>
        $(document).ready(function () {
            $(document).ajaxSend(function () {
                alert("AJAX request is about to send");
            });

            $("button").click(function () {
                $("#heading").load("demo.txt");
            });
        });
    script>
head>

<body style="text-align:center;">

    <div id="div_content">

        <h1 id="heading" 
            style="color: green;">
            GeeksforGeeks
        h1>

        <p style="font-size: 20px;">
            A computer science portal for geeks
        p>
    div>
    <button>
        Change Content
    button>
body>

html>

Output: