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onscroll Event

❮ Event Object

Example

Execute a JavaScript when a <div> element is being scrolled:

<div onscroll="myFunction()">
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Definition and Usage

The onscroll event occurs when an element's scrollbar is being scrolled.

Tip: use the CSS overflow style property to create a scrollbar for an element.


Browser Support

Event
onscroll Yes Yes Yes Yes Yes

Syntax

In HTML:

<element onscroll="myScript">
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In JavaScript:

object.onscroll = function(){myScript};
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In JavaScript, using the addEventListener() method:

object.addEventListener("scroll", myScript);
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Note: The addEventListener() method is not supported in Internet Explorer 8 and earlier versions.



Technical Details

Bubbles: No
Cancelable: No
Event type: UIEvent
Supported HTML tags: <address>, <blockquote>, <body>, <caption>, <center>, <dd>, <dir>, <div>, <dl>, <dt>, <fieldset>, <form>, <h1> to <h6>, <html>, <li>, <menu>, <object>, <ol>, <p>, <pre>, <select>, <tbody>, <textarea>, <tfoot>, <thead>, <ul>
DOM Version: Level 2 Events

More Examples

Example

Toggle between class names on different scroll positions - When the user scrolls down 50 pixels from the top of the page, the class name "test" will be added to an element (and removed when scrolled up again).

window.onscroll = function() {myFunction()};

function myFunction() {
    if (document.body.scrollTop > 50 || document.documentElement.scrollTop > 50) {
        document.getElementById("myP").className = "test";
    } else {
        document.getElementById("myP").className = "";
    }
}
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Example

Slide in an element when the user has scrolled down 350 pixels from the top of the page (add the slideUp class):

window.onscroll = function() {myFunction()};

function myFunction() {
    if (document.body.scrollTop > 350 || document.documentElement.scrollTop > 350) {
        document.getElementById("myImg").className = "slideUp";
}
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❮ Event Object