HTML5 Canvas Select Shapes by Name with KineticJS

To select shapes by name with KineticJS, we can use the get() method using the . selector. The get() method returns an array of nodes that match the selector string. The return array is a Kinetic.Collection array, which is basically a typical JavaScript array with a special each() method. The each() method enables us to quickly iterate through every node in the array.

Instructions: press the "Activate Rectangles" button to select the rectangles by name and perform a transition on each. You can also drag and drop the rectangles.

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Code Editor

<!DOCTYPE HTML>
<html>
  <head>
    <style>
      body {
        margin: 0px;
        padding: 0px;
      }
      #buttons {
        position: absolute;
        top: 5px;
        left: 10px;
      }
      #buttons > input {
        padding: 10px;
        display: block;
        margin-top: 5px;
      }
    </style>
  </head>
  <body>
    <div id="container"></div>
    <div id="buttons">
      <input type="button" id="activate" value="Activate rectangles">
    </div>
    <script src="http://www.html5canvastutorials.com/libraries/kinetic-v4.5.2-beta.js"></script>
    <script defer="defer">
      var stage = new Kinetic.Stage({
        container: 'container',
        width: 578,
        height: 200
      });
      var layer = new Kinetic.Layer();

for(var n = 0; n < 10; n++) {
        var circle = new Kinetic.Circle({
          x: Math.random() * stage.getWidth(),
          y: Math.random() * stage.getHeight(),
          radius: Math.random() * 50 + 25,
          fill: 'red',
          strokeWidth: 3
        });

layer.add(circle);
      }

var rect1 = new Kinetic.Rect({
        x: 250,
        y: 90,
        width: 100,
        height: 50,
        fill: 'green',
        strokeWidth: 3,
        offset: {
          x: 50,
          y: 25
        },
        draggable: true,
        name: 'rectangle'
      });

var rect2 = new Kinetic.Rect({
        x: 400,
        y: 90,
        width: 100,
        height: 50,
        fill: 'green',
        strokeWidth: 3,
        offset: {
          x: 50,
          y: 25
        },
        draggable: true,
        name: 'rectangle'
      });

layer.add(rect1);
      layer.add(rect2);
      stage.add(layer);

document.getElementById('activate').addEventListener('click', function() {
        // select shapes by name
        var shapes = stage.get('.rectangle');

// apply transition to all nodes in the array
        shapes.each(function(shape) {
          new Kinetic.Tween({
            node: shape, 
            duration: 1,
            scaleX: Math.random() * 2,
            scaleY: Math.random() * 2,
            easing: Kinetic.Easings.ElasticEaseOut
          }).play();
        });
      }, false);
    </script>
  </body>
</html>

< Select by Id Select by Type >

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Modified on May 17th, 2013 by Eric Rowell