Learn how to create HTML animations using JavaScript.

- Create an Animation Container – all animations should be relative to a container element.
<div id ="content">
<div id ="animate">The animation will go here.</div>
</div>
2. Style the Elements:
The container element should be created with style =“position: relative”
The animation element should be created with style =“position: absolute”.
<!Doctype html>
<html>
<style>
#content {
width: 400px;
height: 400px;
position: relative;
background-color: #e9c46a;
}
#animate {
width: 50px;
height: 50px;
position: absolute;
background-color: #264653;
}
</style>
<body>
<div id="content">
<div id="animate"></div>
</div>
</body>
</html>
Output:
3. Animation Code – JavaScript animations are done by programming gradual changes in an element’s style.
The changes are called by a timer. When the timer interval is small, the animation looks continuous.
function myAnimation() {
var elem = document.getElementById("animate");
var pos = 0;
var id = setInterval(frame, 5);
function frame() {
if (pos == 350) {
clearInterval(id);
} else {
pos++;
elem.style.top = pos + "px";
elem.style.left = pos + "px";
}
}
}
Example:
<!DOCTYPE html>
<html>
<style>
#content {
width: 400px;
height: 400px;
position: relative;
background-color: #e9c46a;
}
#animate {
width: 50px;
height: 50px;
position: absolute;
background-color: #264653;
}
</style>
<body>
<p><button onclick="myAnimation()">Start!</button></p>
<div id ="content">
<div id ="animate"></div>
</div>
<script>
function myAnimation() {
var elem = document.getElementById("animate");
var pos = 0;
var id = setInterval(frame, 5);
function frame() {
if (pos == 350) {
clearInterval(id);
} else {
pos++;
elem.style.top = pos + "px";
elem.style.left = pos + "px";
}
}
}
</script>
</body>
</html>
Output:
Enjoy coding!
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