HTMLCanvasElement.mozGetAsFile()

Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The HTMLCanvasElement.mozGetAsFile() method returns a File object representing the image contained in the canvas; this file is a memory-based file, with the specified name. If type is not specified, the image type is image/png.

Syntax

canvas.mozGetAsFile(name, type);

Parameters

name
A DOMString indicating the file name.
type Optional
A DOMString indicating the image format. The default type is image/png.

Return value

A File object representing the image contained in the canvas.

Examples

Example: Using mozGetAsFile()

HTML snippet:

<canvas id="canvas" width="100" height="100"></canvas>
<p><a href="#" id="link">Click here to try out mozGetAsFile().</a></p>

The following code uses mozGetAsFile to create a File object from the canvas and appends it as an image to the page using FileReader.readAsDataURL():

function draw() {
   var canvas = document.getElementById("canvas");
   var ctx = canvas.getContext("2d");
 
   ctx.fillStyle = "rgb(200,0,0)";
   ctx.fillRect (10, 10, 55, 50);
 
   ctx.fillStyle = "rgba(0, 0, 200, 0.5)";
   ctx.fillRect (30, 30, 55, 50);

   var link = document.getElementById("link");
   link.addEventListener("click", copy);
}
    
function copy() {
  var canvas = document.getElementById("canvas");
  var f = canvas.mozGetAsFile("test.png");
  var reader = new FileReader();
  reader.readAsDataURL(f);
      
  reader.onloadend = function () {
    var newImg = document.createElement("img");
    newImg.src = reader.result;
    document.body.appendChild(newImg);
  }
}

window.addEventListener("load", draw);

Specifications

Not part of any specification.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support No support 4.0 (2) No support No support No support
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support No support No support 4.0 (2) No support No support No support

See also

Document Tags and Contributors

 Contributors to this page: ucsavl, fscholz
 Last updated by: ucsavl,