HTML5 Canvas Hide and Show Shape Tutorial

To hide and show a shape with Konva, we can set the visible property when we instantiate a shape, or we can use the hide() and show() methods.

Instructions: Click on the buttons to show and hide the shape.

Konva Hide and Show Demoview raw

<!DOCTYPE html>
<html>
  <head>
    <script src="https://unpkg.com/[email protected]/konva.min.js"></script>
    <meta charset="utf-8" />
    <title>Konva Hide and Show Demo</title>
    <style>
      body {
        margin: 0;
        padding: 0;
        overflow: hidden;
        background-color: #f0f0f0;
      }
      #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="show">show</button>
      <button id="hide">hide</button>
    </div>
    <script>
      var width = window.innerWidth;
      var height = window.innerHeight;

      var stage = new Konva.Stage({
        container: 'container',
        width: width,
        height: height,
      });
      var layer = new Konva.Layer();

      var pentagon = new Konva.RegularPolygon({
        x: stage.width() / 2,
        y: stage.height() / 2,
        sides: 5,
        radius: 70,
        fill: 'red',
        stroke: 'black',
        strokeWidth: 4,
        visible: false,
      });

      // add the shape to the layer
      layer.add(pentagon);

      // add the layer to the stage
      stage.add(layer);

      // add button event bindings
      document.getElementById('show').addEventListener(
        'click',
        function () {
          pentagon.show();
        },
        false
      );

      document.getElementById('hide').addEventListener(
        'click',
        function () {
          pentagon.hide();
        },
        false
      );
    </script>
  </body>
</html>

Enjoying Konva? Please consider to support the project.