jQuery scroll event
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In this video we will discuss scroll event and how to handle it using jQuery.
scroll event is raised when the user scrolls to a different place in the element. It applies to window objects, but also to scrollable frames and elements with the overflow CSS property set to scroll.
In the following exampe, notice that the div element overflow style is set to scroll. The div element has a scrollbar and as you scroll up and down the div element, the scroll event is raised and handled.
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<html>
<head>
<title></title>
<script src="jquery-1.11.2.js"></script>
<script type="text/javascript">
$(document).ready(function () {
$('div').scroll(function () {
$('h3').css('display', 'inline').fadeOut(1000);
});
});
</script>
</head>
<body style="font-family:Arial">
<div style="width:300px; height:200px; border:1px solid black; overflow:scroll">
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</div>
<br />
<h3 style="display:none; color:red">Scroll event handled</h3>
</body>
</html>
The following example, keeps track of how many times the scroll event is raised.
<html>
<head>
<title></title>
<script src="jquery-1.11.2.js"></script>
<script type="text/javascript">
$(document).ready(function () {
var count = 0;
$('div').scroll(function () {
$('span').text(count += 1);
});
});
</script>
</head>
<body style="font-family:Arial">
<div style="width:300px; height:200px; border:1px solid black; overflow:scroll">
DIV CONTENT
</div>
<br />
<h3 style="color:red">Scroll event handled <span>0</span> time(s)</h3>
</body>
</html>
The following example, keeps track of whether the user scrolled up or down.
<html>
<head>
<script src="jquery-1.11.2.js"></script>
<script type="text/javascript">
$(document).ready(function () {
var lastScrollTop = 0;
$('div').scroll(function () {
var currentScrollPosition = $(this).scrollTop();
if (currentScrollPosition > lastScrollTop) {
$('h3').text('You scrolled down');
} else {
$('h3').text('You scrolled up');
}
lastScrollTop = currentScrollPosition;
});
});
</script>
</head>
<body style="font-family:Arial">
<div style="width:300px; height:200px; border:1px solid black; overflow:scroll">
DIV CONTENT
</div>
<br />
<h3 style="display:inline; color:red"></h3>
</body>
</html>
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