jQuery load more data on scroll

In jQuery, check whether you have hit the bottom of page using scroll function. Once you hit that, make an ajax call (you can show a loading image here till ajax response) and get the next set of data, append it to the div. This function gets executed as you scroll down the page again.

$(window).scroll(function() {
    if($(window).scrollTop() == $(document).height() - $(window).height()) {
           // ajax call get data from server and append to the div
    }
});

Have you heard about the jQuery Waypoint plugin.

Below is the simple way of calling a waypoints plugin and having the page load more Content once you reaches the bottom on scroll :

$(document).ready(function() {
    var $loading = $("<div class='loading'><p>Loading more items&hellip;</p></div>"),
    $footer = $('footer'),
    opts = {
        offset: '100%'
    };

    $footer.waypoint(function(event, direction) {
        $footer.waypoint('remove');
        $('body').append($loading);
        $.get($('.more a').attr('href'), function(data) {
            var $data = $(data);
            $('#container').append($data.find('.article'));
            $loading.detach();
            $('.more').replaceWith($data.find('.more'));
            $footer.waypoint(opts);
        });
    }, opts);
});

Here is an example:

  1. On scrolling to the bottom, html elements are appeneded. This appending mechanism are only done twice, and then a button with powderblue color is appended at last.

<!DOCTYPE html>
<html>
<head>
    <title>Demo: Lazy Loader</title>
    <script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
    <style>
        #myScroll {
            border: 1px solid #999;
        }

        p {
            border: 1px solid #ccc;
            padding: 50px;
            text-align: center;
        }

        .loading {
            color: red;
        }
        .dynamic {
            background-color:#ccc;
            color:#000;
        }
    </style>
    <script>
		var counter=0;
        $(window).scroll(function () {
            if ($(window).scrollTop() == $(document).height() - $(window).height() && counter < 2) {
                appendData();
            }
        });
        function appendData() {
            var html = '';
            for (i = 0; i < 10; i++) {
                html += '<p class="dynamic">Dynamic Data :  This is test data.<br />Next line.</p>';
            }
            $('#myScroll').append(html);
			counter++;
			
			if(counter==2)
			$('#myScroll').append('<button id="uniqueButton" style="margin-left: 50%; background-color: powderblue;">Click</button><br /><br />');
        }
    </script>
</head>
<body>
    <div id="myScroll">
        <p>
            Contents will load here!!!.<br />
        </p>
        <p >This is test data.<br />Next line.</p>
        <p >This is test data.<br />Next line.</p>
        <p >This is test data.<br />Next line.</p>
        <p >This is test data.<br />Next line.</p>
        <p >This is test data.<br />Next line.</p>
        <p >This is test data.<br />Next line.</p>
        <p >This is test data.<br />Next line.</p>
        <p >This is test data.<br />Next line.</p>
        <p >This is test data.<br />Next line.</p>
        <p >This is test data.<br />Next line.</p>
        <p >This is test data.<br />Next line.</p>
        <p >This is test data.<br />Next line.</p>
        <p >This is test data.<br />Next line.</p>
        <p >This is test data.<br />Next line.</p>
        <p >This is test data.<br />Next line.</p>
        <p >This is test data.<br />Next line.</p>
        <p >This is test data.<br />Next line.</p>
        <p >This is test data.<br />Next line.</p>
        <p >This is test data.<br />Next line.</p>
        <p >This is test data.<br />Next line.</p>
        <p >This is test data.<br />Next line.</p>
        <p >This is test data.<br />Next line.</p>
    </div>
</body>
</html>

If not all of your document scrolls, say, when you have a scrolling div within the document, then the above solutions won't work without adaptations. Here's how to check whether the div's scrollbar has hit the bottom:

$('#someScrollingDiv').on('scroll', function() {
    let div = $(this).get(0);
    if(div.scrollTop + div.clientHeight >= div.scrollHeight) {
        // do the lazy loading here
    }
});

Tags:

Javascript

Ajax

Jquery

Scroll

Recent Posts