Web HTMLCanvasElement API | Canvas Element width property

In Web API there is a canvas element which has an attribute of width which represents the width of the canvas in CSS pixels. There is a HTMLCanvasElement.width property by which we can fetch this width attribute from canvas element, which is a positive integer.

Syntax:

var widthVal = canvas.width;
canvas.width = widthVal;

Note: If the width attribute value is not provided or is set to undefined value, like a negative value then the default value is set to 300.



Example 1: width attribute set to 500

filter_none

edit
close

play_arrow

link
brightness_4
code

<!DOCTYPE html>
<html>
  
<head>
  
    <style>
        a:focus {
            background-color: magenta;
        }
    </style>
    <canvas id="canvas" width="500" height="300"></canvas>
    <script type="text/javascript">
        function getwidth() {
            var canvas = document.getElementById('canvas');
  
            document.getElementById('width').innerHTML = canvas.width;
        }
    </script>
  
</head>
  
<body>
    <center>
  
        <h1 style="color:green;">  
                GeeksForGeeks  
            </h1>
  
        <h2>HTML Canvas Element width property</h2>
        <button onclick="getwidth ();">Get Width</button>
        <p id='width'></p>
    </center>
</body>
  
</html>

chevron_right


Output:
Click the button:

When the button is clicked:

Example 2: Width attribute not provided

filter_none

edit
close

play_arrow

link
brightness_4
code

<!DOCTYPE html>
<html>
  
<head>
  
    <style>
        a:focus {
            background-color: magenta;
        }
    </style>
    <canvas id="canvas"></canvas>
    <script type="text/javascript">
        function getwidth() {
            var canvas = document.getElementById('canvas');
  
            document.getElementById('width').innerHTML = canvas.width;
        }
    </script>
  
</head>
  
<body>
    <center>
  
        <h1 style="color:green;">  
                GeeksForGeeks  
            </h1>
  
        <h2>HTML Canvas Element width property</h2>
        <button onclick="getwidth ();">Get Width</button>
        <p id='width'></p>
    </center>
</body>
  
</html>

chevron_right


Output:
Click the button:

When the button is clicked:

Supported Browsers:

  • Google Chrome 4
  • Edge 12
  • Internet Explorer 9
  • Firefox 3.6
  • Safari 3.1
  • Opera 9


My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.



Improved By : Akanksha_Rai



Article Tags :

Be the First to upvote.


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.