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How to detect when user scrolls to the bottom of a div ?
  • Difficulty Level : Expert
  • Last Updated : 07 Jun, 2019

The task is to detect the bottom of the <div> element when user scrolls to the bottom using JQuery. Here are few methods discussed.

  • jQuery on() Method:
    This method adds one or more event handlers for the selected elements and child elements.
    Syntax:
    $(selector).on(event, childSelector, data, function, map)
    

    Parameters:

    • event: This parameter is required. It specifies one or more event(s) or namespaces to attach to the selected elements.
      In the case of multiple event values, those are separated by space. The event must be valid.
    • childSelector: This parameter is optional. It specifies that the event handler should only be attached to the defined child elements.
    • data: This parameter is optional. It specifies additional data to pass to the function.
    • function: This parameter is required. It specifies the function to run when the event occurs.
    • map: It specifies an event map ({event:func(), event:func(), …}) having one or more event to add to the selected elements, and functions to run when the events happens.

Example 1: This example alerts You reached the end of the DIV when the user scrolls to the bottom of the div element with class = div.




<!DOCTYPE HTML>
<html>
  
<head>
    <title>
        JQuery 
      | Detecting when user scrolls to bottom of div.
    </title>
</head>
<script src=
</script>
  
<body style="text-align:center;" 
      id="body">
    <h1 style="color:green;"
            GeeksForGeeks 
        </h1>
    <p id="GFG_UP" 
       style="font-size: 17px;
              font-weight: bold;">
    </p>
    <div class="div">
        <h1>GeeksforGeeks</h1>
        <h1>GeeksforGeeks</h1>
        <h1>GeeksforGeeks</h1>
        <h1>GeeksforGeeks</h1>
        <h1>GeeksforGeeks</h1>
        <h1>GeeksforGeeks</h1>
        <h1>GeeksforGeeks</h1>
        <h1>GeeksforGeeks</h1>
        <h1>GeeksforGeeks</h1>
        <h1>GeeksforGeeks</h1>
        <h1>GeeksforGeeks</h1>
        <h1>GeeksforGeeks</h1>
        <h1>GeeksforGeeks</h1>
    </div>
    <script>
        $('#GFG_UP').text(
          'Scroll till bottom to get alert!');
        
        $(window).on('scroll', function() {
            if ($(window).scrollTop() >= $(
              '.div').offset().top + $('.div').
                outerHeight() - window.innerHeight) {
                
                alert('You reached the end of the DIV');
            }
        });
    </script>
</body>
  
</html>

Output:



  • Before reaching the bottom:
  • After reaching the bottom:

Example 2: This example alerts End of DIV is reached! when the user scrolls to the bottom of the div element with class = div.




<!DOCTYPE HTML>
<html>
  
<head>
    <title>
        JQuery 
      | Detecting when user scrolls to bottom of div.
    </title>
</head>
<script src=
</script>
  
<body style="text-align:center;" id="body">
    <h1 style="color:green;"
            GeeksForGeeks 
        </h1>
    <p id="GFG_UP"
       style="font-size: 17px;
              font-weight: bold;">
    </p>
    <center>
        <div class="div" style="width:200px;
                                height:150px;
                                overflow:auto;">
            <h1>GeeksforGeeks</h1>
            <h1>GeeksforGeeks</h1>
            <h1>GeeksforGeeks</h1>
            <h1>GeeksforGeeks</h1>
            <h1>GeeksforGeeks</h1>
            <h1>GeeksforGeeks</h1>
            <h1>GeeksforGeeks</h1>
            <h1>GeeksforGeeks</h1>
            <h1>GeeksforGeeks</h1>
            <h1>GeeksforGeeks</h1>
            <h1>GeeksforGeeks</h1>
            <h1>GeeksforGeeks</h1>
            <h1>GeeksforGeeks</h1>
        </div>
    </center>
    <script>
        $('#GFG_UP').text('Scroll till bottom to get alert!');
        jQuery(function($) {
            $('.div').on('scroll', function() {
                if ($(this).scrollTop() +
                    $(this).innerHeight() >= 
                    $(this)[0].scrollHeight) {
                    
                    alert('End of DIV is reached!');
                }
            });
        });
    </script>
</body>
  
</html>

Output:

  • Before reaching the bottom:
  • After reaching the bottom:

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