JS: Fade a Element Using CSS Transition

By Xah Lee. Date: . Last updated: .

This page shows you how to fade a HTML element using JavaScript by CSS transition.

FADE AWAY

Code

Here's the HTML code:

<div id="fade42509"><span style="font-size:3rem">FADE AWAY</div>

<button id="b1">Fade</button>
<button id="b2">UnFade</button>

Here's the JavaScript code:

{
// 2013-07-10, 2019-05-31

const fadeBox = document.getElementById("fade42509");
const btn1 = document.getElementById("b1");
const btn2 = document.getElementById("b2");

fadeBox.style.opacity = 1;
fadeBox.style.transition = "opacity 1s";

const fade = (() => { fadeBox.style.opacity = 0; });

const unfade = (() => { fadeBox.style.opacity = 1; });

btn1.addEventListener("click", fade , false);
btn2.addEventListener("click", unfade , false);
}

This is done by simply setting CSS “transition” property, with changes on opacity.

[see CSS: Transition]

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