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<!DOCTYPE html>
<title>drag & drop - dragging elements that overlay each other</title>
<style>
body > div {
height: 200px;
width: 200px;
background-color: navy;
position: absolute;
top: 8px;
left: 8px;
}
body > div + div {
height: 100px;
width: 100px;
background-color: orange;
left: 58px;
top: 58px;
}
body > div + div + div {
background-color: fuchsia;
left: 258px;
}
p:first-of-type {
margin-top: 220px;
}
</style>
<script>
window.onload = function() {
var passed = true, orange = document.getElementsByTagName('div')[1], blue = document.getElementsByTagName('div')[0], fuchsia = document.getElementsByTagName('div')[2];
orange.ondragstart = function(e) {
e.dataTransfer.effectAllowed = 'copy';
e.dataTransfer.setData('text/plain', 'PASS');
};
blue.ondragstart = function(e) {
e.dataTransfer.effectAllowed = 'copy';
e.dataTransfer.setData('text/plain', 'FAIL');
};
fuchsia.ondragenter = fuchsia.ondragover = function(e) {
e.preventDefault();
e.dataTransfer.dropEffect = 'copy';
};
fuchsia.ondrop = function(e) {
//it's possible this could get called twice if the browser drags both items, so it uses the "passed" variable to make sure
//that if blue gets dropped first, it remains false when orange then gets dropped
passed = passed && ( e.dataTransfer.getData('text/plain') == 'PASS' );
document.getElementsByTagName('p')[0].innerHTML = passed ? 'PASS' : 'FAIL';
};
};
</script>
<div draggable='true'></div><div draggable='true'></div><div></div>
<p>Use your pointing device to drag the orange box to the pink box, then release it. While dragging, the drag placeholder should show that only the orange box is being dragged.</p>
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