HTML5 Canvas Multi-Event Binding Tutorial

To bind multiple events to a single handler with KineticJS, we can use the on() method and pass in a space delimited string containing multiple event types.

Instructions: Mouseover, mousedown, and mouseup over the circle to observe that the function bound to the circle is executed for each event.

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Code Editor

<!DOCTYPE HTML>
<html>
  <head>
    <style>
      body {
        margin: 0px;
        padding: 0px;
      }
    </style>
  </head>
  <body>
    <div id="container"></div>
    <script src="http://d3lp1msu2r81bx.cloudfront.net/kjs/js/lib/kinetic-v4.5.2.min.js"></script>
    <script defer="defer">
      function writeMessage(messageLayer, message) {
        var context = messageLayer.getContext();
        messageLayer.clear();
        context.font = '18pt Calibri';
        context.fillStyle = 'black';
        context.fillText(message, 10, 25);
      }
      var stage = new Kinetic.Stage({
        container: 'container',
        width: 578,
        height: 200
      });
      var circleLayer = new Kinetic.Layer();
      var messageLayer = new Kinetic.Layer();

var numEvents = 0;

var circle = new Kinetic.Circle({
        x: stage.getWidth() / 2,
        y: stage.getHeight() / 2 + 10,
        radius: 70,
        fill: 'red',
        stroke: 'black',
        strokeWidth: 4
      });

circle.on('mouseover mousedown mouseup', function() {
        writeMessage(messageLayer, 'Multi-event binding!  Events: ' + (++numEvents));
      });
      circle.on('mouseout', function() {
        writeMessage(messageLayer, '');
      });

circleLayer.add(circle);

stage.add(circleLayer);
      stage.add(messageLayer);

</script>
  </body>
</html>

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Modified on April 9th, 2013 by Eric Rowell