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Window | Window.requestAnimationFrame() Method
  • Last Updated : 23 Oct, 2019

Nowadays, various web development technologies are introduced to create elegant web pages. While talking about elegant web pages, one of the most important things that come to mind is animation. There are many ways to generate them, modern CSS is one of them but JavaScript has always been a power-packed option to do so.

The requestAnimationFrame() is one of the methods present in JavaScript to powerfully incorporate amazing and simple animations within our project. Earlier methods like setTimeout() or setInterval() were used which was okay but they slow down the whole process. The main problem with them was of synchronization. The transition time was very slow and didn’t match with the user’s system perfectly.

Here, requestAnimationFrame() came into the picture. Basically, requestAnimationFrame() method easily syncs in with your browser timings and generate a call to perform the specific animation before the actual loading of the screen. Further, it also slows down its process when the animation is actually not in the use thus saving resources.

Syntax:

window.requestAnimationFrame( callback );

Parameter: This method accepts single parameter as mentioned above and described below:



  • callback: Unless you want the animation to stop, you should write the callback function so that it calls itself so that a request to the next frame is made. Callback function takes timestamp or simply a time value at which it should start executing.

Return Values: This method returns a non zero long integer value that acts as a unique identity for the animation entry in callback function.

Below examples illustrate the requestAnimationFrame() method in Web API:

Example 1:




<!DOCTYPE html>
<html>
<head>
    <title>
        Window.requestAnimationFrame() Method
    </title>
</head>
  
<body>
    <div id="gfg">
        <h1 style="color:green;">GeeksforGeeks</h1>
        <h4>Window.requestAnimation()</h4>
    </div>
  
    <script type="text/javascript">
  
        // Setting the start point for animation
        var start = null; 
        var element = document.getElementById('gfg');
  
        function startAnim(timestamp) {
  
            // Timestamp is an integer that represents the number 
            // of seconds elapsed since January 1 1970.
            if (!start) start = timestamp;
  
            // Setting the difference between timestamp 
            // and the set start point as our progress
            var progress = timestamp - start;
  
            // Moving our div element
            element.style.transform = 
            'translateX(' + Math.min(progress / 10, 700) + 'px)';
            window.requestAnimationFrame(startAnim);
        }
  
        window.requestAnimationFrame(startAnim);
    </script>
</body>
  
</html>                    

Output:

Example 2:




<!DOCTYPE html>
<html>
  
<head>
    <style>
        div {
            position: absolute;
            left: 10px;
            top: 50px;
            padding: auto;
            color: white
        }
        h1 {
            color: green;
        }
    </style>
</head>
  
<body>
    <div id="gfg">
        <h1>GeeksforGeeks</h1></div>
    <center>
        <button onclick="start()">Start the animation</button>
    </center>
    <script type="text/javascript">
        var x = document.getElementById("gfg");
  
        // Initializing variables
        var requestId;
        var stopped;
        var starttime;
  
        function startAnim(time) {
  
            // Set left style to a function of time if it is not stopped
            if (!stopped) {
  
                // We use the difference between time returned 
                // by Data.now() and the animation starttime 
                x.style.left = ((Date.now() - starttime) / 10 % 700) + "px";
                requestId = window.requestAnimationFrame(startAnim);
            }
        }
  
        function start() {
  
            // Return the number of milliseconds since 1970/01/01:
            starttime = Date.now();
  
            // Starting point of animation
            requestId = window.requestAnimationFrame(startAnim);
            stopped = false; // Means animation will not stop 
        }
    </script>
</body>
  
</html>

Output:

Supported Browsers: The browsers supported by Window.requestAnimationFrame() Method are listed below:

  • Google Chrome 23.0
  • Internet Explorer 10.0
  • Firefox 11.0
  • Opera 10.0
  • Safari 6.1



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