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();
layer.draw();
},
false
);

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