How to drag and drop DOM image into the canvas

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In this demo we will demonstrate how drop DOM element that is placed outside of canvas into the stage.

The first image you see is a DOM image. We can use HTML5 drag&drop to enable its dragging.

You will need some extra step if you need to enable drag&drop for DOM element on touch devices. You can read here for more info.

Instructions: drag&drop yoda into the canvas.

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

#container {
background-color: rgba(0, 0, 0, 0.1);
}

p {
margin: 4px;
}

#drag-items img {
height: 100px;
}
</style>
</head>

<body>
<p>
Drag&drop yoda into the grey area.
</p>
<div id="drag-items">
<img src="/assets/yoda.jpg" draggable="true" />
<img src="/assets/darth-vader.jpg" draggable="true" />
</div>
<div id="container"></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();
stage.add(layer);

// what is url of dragging element?
var itemURL = '';
document
.getElementById('drag-items')
.addEventListener('dragstart', function(e) {
itemURL = e.target.src;
});

var con = stage.container();
con.addEventListener('dragover', function(e) {
e.preventDefault(); // !important
});

con.addEventListener('drop', function(e) {
e.preventDefault();
// now we need to find pointer position
// we can't use stage.getPointerPosition() here, because that event
// is not registered by Konva.Stage
// we can register it manually:
stage.setPointersPositions(e);

Konva.Image.fromURL(itemURL, function(image) {
layer.add(image);

image.position(stage.getPointerPosition());
image.draggable(true);

layer.draw();
});
});
</script>
</body>
</html>
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