HTML5 Canvas Stage Data URL with KineticJS

To get the data URL of the stage with KineticJS, we can use the toDataURL() method which requires a callback function. In addition, we can also pass in a mime type such as image/jpeg and a quality value that ranges between 0 and 1. We can also get the data URLs of specific nodes, including layers, groups, and shapes.

Note: The toDataURL() method requires that any images drawn onto the canvas are hosted on a web server with the same domain as the code executing it. If this condition is not met, a SECURITY_ERR exception is thrown.

Instructions: Drag and drop the rectangle and then click on the save button to get the composite data url and open the resulting image in a new window

Open in new window

Code Editor

<!DOCTYPE HTML>
<html>
  <head>
    <style>
      body {
        margin: 0px;
        padding: 0px;
      }
      #buttons {
        position: absolute;
        left: 10px;
        top: 0px;
      }
      button {
        margin-top: 10px;
        display: block;
      }
    </style>
  </head>
  <body>
    <div id="container"></div>
    <div id="buttons">
      <button id="save">
        Save as image
      </button>
    </div>
    <script src="http://d3lp1msu2r81bx.cloudfront.net/kjs/js/lib/kinetic-v4.5.2.min.js"></script>
    <script defer="defer">
      var stage = new Kinetic.Stage({
        container: 'container',
        width: 578,
        height: 200
      });
      var layer = new Kinetic.Layer();
      var rectX = stage.getWidth() / 2 - 50;
      var rectY = stage.getHeight() / 2 - 25;

var box = new Kinetic.Rect({
        x: rectX,
        y: rectY,
        width: 100,
        height: 50,
        fill: '#00D2FF',
        stroke: 'black',
        strokeWidth: 4,
        draggable: true
      });

box.on('mouseover', function() {
        document.body.style.cursor = 'pointer';
      });

box.on('mouseout', function() {
        document.body.style.cursor = 'default';
      });

layer.add(box);
      stage.add(layer);

< Select by Type Serialize Stage >

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Modified on April 9th, 2013 by Eric Rowell