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<!doctype html>
<html>
<head>
<title>Drag and drop without cancelling dragenter on body</title>
<style type="text/css">
div:first-child {
height: 100px;
width: 100px;
background: orange;
display: inline-block;
}
div:first-child + div {
height: 100px;
width: 100px;
margin-left: 100px;
background: blue;
display: inline-block;
}
</style>
<script type="text/javascript">
//If dragenter is cancelled the body should then become the target element, receiving both a dragenter and a dragover event.
//When the body is the actual immediate user selection (first time over the body), that means it gets *2* dragenter events
//Then when a div becomes immediate user selection (blue) but does not cancel the dragenter event, dragenter does not need
//to fire on body because body is already the current target element
//Then when the body is the actual immediate user selection again (second time over the body), it is already the current
//target element, so does not get a dragenter event
window.onload = function () {
var drag = document.getElementsByTagName('div')[0], beforecount = 0, aftercount = 0, switchcount = false;
drag.ondragstart = function (e) {
e.dataTransfer.setData('text','hello');
e.dataTransfer.effectAllowed = 'copy';
};
drag.ondragenter = drag.ondrop = drag.ondragover = function (e) {
e.preventDefault();
};
var drop = document.getElementsByTagName('div')[1];
drop.ondragenter = function (e) {
switchcount = true;
};
drop.ondragover = function (e) {
e.preventDefault();
};
document.body.ondragenter = function (e) {
if( e.target != this ) { return; }
if( switchcount ) { aftercount++; } else { beforecount++; }
};
drag.ondragend = function (e) {
document.getElementsByTagName('div')[2].innerHTML = ( beforecount == 2 && aftercount == 0 ) ? 'PASS' : ( 'FAIL, dragenter fired on body '+beforecount+' time(s) before blue.ondragenter and '+aftercount+' time(s) afterwards, instead of 2 and 0 times respectively' );
};
};
</script>
</head>
<body>
<div draggable="true"></div><div></div>
<div> </div>
<p>Drag the orange square onto the blue square, then back to the orange square, and release it.</p>
<noscript><p>Enable JavaScript and reload</p></noscript>
</body>
</html>