HTML | DOM Canvas Object

The DOM Canvas Object is used to represent the HTML <Canvas> element. The <canvas> tag is used to draw a graphics in the document using javascript. It is new in HTML5. The canvas element is accessed by getElementById().

Syntax:

accessed by getElementById("id").

Where “id” is the ID assigned to the Canvas tag.

Example-1:

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>canvas Tag</title> 
</head> 
  
<body> 
    <center> 
        <h1 style="color:green; Font-size:35px;" > 
           GeeksForGeeks 
        </h1> 
        <h2>DOM Canvas Object</h2> 
        
        <!-- canvas Tag starts here -->
        <canvas id="geeks" height="200" width="200" 
                style="border:1px solid green"> 
        </canvas> 
        <!-- canvas Tag ends here -->
        
        <br> 
        <br> 
        
        <button onclick="myGeeks()">Submit</button> 
         
      <script> 
            function myGeeks() { 
  
                var gfg = document.getElementById("geeks"); 
                
                var sudo = gfg.getContext("2d"); 
                sudo.beginPath(); 
                sudo.arc(100, 100, 90, 0, 2 * Math.PI); 
                sudo.stroke(); 
            } 
        </script> 
</body> 
  
</html> 

Output:
Before Clicking On Button:

After Clicking on Button:

Example-2: Canvas Object can be created by using the document.createElement method.

<!DOCTYPE html> 
<html> 
  
<head> 
    <style> 
        canvas { 
            border: 3px solid black; 
        } 
    </style> 
</head> 
  
<body> 
    <h1 style = "color: green; font-size:40px;" > 
      GeeksForGeeks 
    </h1> 
    <h2>DOM Canvas Object</h2> 
    
    <button onclick="myGeeks()"> 
      Submit 
    </button> 
  
    <script> 
        function myGeeks() { 
            var geeks = document.createElement("CANVAS"); 
            var gfg = geeks.getContext("2d"); 
            gfg.fillStyle = "green"; 
            gfg.fillRect(40, 40, 200, 100); 
            document.body.appendChild(geeks); 
        } 
    </script> 
  
</body> 
  
</html> 

Output:
Before Clicking on Button:

After Clicking on Button:

Supported Browsers: The browser supported by DOM Canvas Object are listed below:

Google Chrome
Internet Explorer
Firefox
Opera
Safari

My Personal Notes

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