How to determine the direction of scroll event in jquery-JS Tutorial-php.cn

How to determine the direction of scroll event in jquery

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Release： 2020-11-30 10:57:40

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Jquery method to determine the direction of the scroll event: use the [scrollTop()] method to set or return the vertical scroll bar position of the selected element, the syntax is [$(selector).scrollTop(position)].

How to determine the direction of scroll event in jquery

The operating environment of this tutorial: Windows 7 system, jquery version 3.2.1. This method is suitable for all brands of computers.

jquery's method of determining the direction of a scrolling event:

In jQuery, you can use the scrollTop() method to determine the direction of a scrolling event. The scrollTop() method is used to set or Returns the vertical scroll bar position of the selected element. Using this method, we can determine the scroll direction.

<strong>jQuery scrollTop()</strong>Method

scrollTop() method sets or returns the vertical scroll bar position of the selected element.

Tip: When the scroll bar is at the top, the position is 0.

Syntax:

$(selector).scrollTop(position)

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Parameters: This method accepts a single parameter position, which is optional. It is used to specify the vertical scroll bar position in pixels.

Return value: Returns the vertical position of the scroll bar of the selected element.

Example:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
html,body {
height: 300%
}
div {
position: fixed;
padding-left: 10px;
padding-top: 30px;
height: 10%;
width: 35%;
font-weight: bold;
border: 2px solid red;
}
</style>
</head>
<body>
<div></div>
<script src="https://code.jquery.com/jquery-1.10.2.js"></script>
<script>
var position = $(window).scrollTop();
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if(scroll > position) {
console.log(&#39;scrollDown&#39;);
$(&#39;div&#39;).text(&#39;向下滚动&#39;);
} else {
console.log(&#39;scrollUp&#39;);
$(&#39;div&#39;).text(&#39;向上滚动&#39;);
}
position = scroll;
});
</script>
</body>
</html>

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