How to achieve TRANSITION effect with setInterval method in JavaScript?
Question
I've set up a web page which changes the background color of the body after every 2 seconds. What I've been struggling with is how to integrate transition effect into the setInterval method. I want the new colors to appear with a fade effect, just like the transition property does in CSS. How can I achieve this effect for these changing/switching background colors?
Here's my code:
var startButton = document.getElementById("startButton"); var body = document.getElementById("body"); // Click Event Listener startButton.addEventListener("click", function() { setInterval(function() { body.style.backgroundColor = generateRandomColors(); }, 2000); }); // GENERATE Random Colors function generateRandomColors() { var arr = []; arr.push(pickRandomColor()); return arr; } // PICK Random Color function pickRandomColor() { // Red var r = Math.floor(Math.random() * 256); // Green var g = Math.floor(Math.random() * 256); // Blue var b = Math.floor(Math.random() * 256); // RGB var rgb = "rgb(" + r + ", " + g + ", " + b + ")"; return rgb; }
<html> <body id="body"> <button id="startButton">Start</button> </body> </html>
1 answers
solution1
2 ACCPTED
Set the transition property specifying which property you want to transition and how long it will take.
var startButton = document.getElementById("startButton"); var body = document.getElementById("body"); // Click Event Listener startButton.addEventListener("click", function() { setInterval(function() { body.style.backgroundColor = generateRandomColors(); }, 2000); }); // GENERATE Random Colors function generateRandomColors() { var arr = []; arr.push(pickRandomColor()); return arr; } // PICK Random Color function pickRandomColor() { // Red var r = Math.floor(Math.random() * 256); // Green var g = Math.floor(Math.random() * 256); // Blue var b = Math.floor(Math.random() * 256); // RGB var rgb = "rgb(" + r + ", " + g + ", " + b + ")"; return rgb; }
body { transition: background-color 2s; }
<html> <body id="body"> <button id="startButton">Start</button> </body> </html>
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