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rocoderes > JavaScript > How to Make Animation using javascript
JavaScript

How to Make Animation using javascript

Admin
Last updated: 2022/11/23 at 5:40 AM
Admin
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2 Min Read
animation using javascript

In this article, we will make and learn to make animation using Javascript. JavaScript does not have a function such as Java‟s sleep method that pauses a task for a specified period of time. However, JavaScript has two functions that can be used to delay the execution of a function.

  • setTimeout – Will execute a function a specific number of milliseconds in the future
  • setInterval – Will execute a function every millisecond 

Both functions take on two arguments:

  • Function – The first argument identifies the function to execute 
  • Time – The number of milliseconds 

setTimeout(someFunction,500); // The function will be executed 500 milliseconds

 setInterval(someFunction,500); // The function will be executed 500 every milliseconds 

The use of the setTimeout is illustrated here by moving a tag across the screen. The int function setups the animation by retrieving a reference to the tag and calling the move function. The function move modifies the position of the tag and recursively schedules itself for future invocation.

function move() {
square.style.left = parseInt(square.style.left)+1+'px';
setTimeout(move,20);
}
function init() {
square = document.getElementById('Square');
square.style.left = '0px';
move();
}
Animation using javascript

The complete page follows:

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Javascript Animation</title>

    <style>
        body{
            background-color: black;
        }
        #Square {
            position: absolute;
            left: 0px;
            top: 8em;
            width: 5rem;
            height: 5rem;
            line-height: 3em;
            background: #99ccff;
            border: 1px solid #003366;
            white-space: nowrap;
            padding: 0.5em;
        }
    </style>
</head>

<body>

    <div id="Square">
    </div>



    <script>
        var square = null;

        function move() {
            square.style.left = parseInt(square.style.left) + 1 + 'px';
            setTimeout(move, 20);
        }

        function init() {
            square = document.getElementById('Square');
            square.style.left = '0px';
            move();
        }

        window.onload = init;
    </script>
</body>

</html>

The same effect can be created using the setInterval function.

function move() {
square.style.left = parseInt(square.style.left)+1+'px';
}
function init() {
square = document.getElementById('Square');
square.style.left = '0px';
setInterval(move,20);
}

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