事件委托

获取Konva最新的信息

我们可以通过 Event 对象的 target 属性获取触发事件的对象。当我们使用事件委托将事件处理绑定在父节点时,可以通过 target 监听子节点触发的事件;

说明: 点击下面的星形,可以看到 layer 绑定的事件处理指明被点击的图形。

Konva Event_Delegation Demoview raw
<!DOCTYPE html>
<html>
<head>
<script src="https://unpkg.com/[email protected]/konva.min.js"></script>
<meta charset="utf-8" />
<title>Konva Event Delegation Demo</title>
<style>
body {
margin: 0;
padding: 0;
overflow: hidden;
background-color: #f0f0f0;
}
</style>
</head>

<body>
<div id="container"></div>
<script>
var stage = new Konva.Stage({
container: 'container',
width: window.innerWidth,
height: window.innerHeight
});

var layer = new Konva.Layer();

var star = new Konva.Star({
x: stage.width() / 2,
y: stage.height() / 2,
numPoints: 15,
innerRadius: 40,
outerRadius: 70,
fill: 'blue',
scale: {
x: 2,
y: 0.5
},
name: 'my star'
});

layer.on('click', function(evt) {
// get the shape that was clicked on
var shape = evt.target;
alert('you clicked on "' + shape.name() + '"');
});

layer.add(star);

// add the layer to the stage
stage.add(layer);
</script>
</body>
</html>