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<head>
<title>Drag and drop without cancelling dragenter and without body</title>
<style type="text/css">
html {
padding:20px;
}
head + div {
height: 100px;
width: 100px;
background: orange;
display: inline-block;
}
head + div + div {
height: 100px;
width: 100px;
margin-left: 100px;
background: blue;
display: inline-block;
}
</style>
<script type="text/javascript"><![CDATA[
//Drag passes from orange to root element. Dragenter fires at root element.
//Dragenter is not cancelled. Body does not exist. Dragenter fires at root element again.
//Drag passes from root element to blue. Dragenter fires at blue.
//Dragenter is not cancelled. Body does not exist. Current target element is root element.
//Drag passes from blue to root element. Current target element is already root element.
//Drag passes from root element to orange. Dragenter fires at orange, and is cancelled.
window.onload = function () {
var orange = document.getElementsByTagName('div')[0], sequence = [];
orange.ondragstart = function (e) {
e.dataTransfer.setData('text','hello');
e.dataTransfer.effectAllowed = 'copy';
};
orange.ondragenter = orange.ondrop = function (e) {
sequence[sequence.length] = 'orange.'+e.type;
e.preventDefault();
};
orange.ondragleave = function (e) {
sequence[sequence.length] = 'orange.dragleave';
};
orange.ondragover = function (e) {
if( sequence[sequence.length-1] != 'orange.dragover' ) {
sequence[sequence.length] = 'orange.dragover';
}
e.preventDefault();
};
var blue = document.getElementsByTagName('div')[1];
blue.ondragenter = blue.ondragover = blue.ondragleave = function (e) {
sequence[sequence.length] = 'blue.'+e.type;
};
document.documentElement.ondragenter = document.documentElement.ondragleave = function (e) {
if( e.target != this ) { return; }
sequence[sequence.length] = 'html.'+e.type;
};
document.documentElement.ondragover = function (e) {
if( e.target != this ) { return; }
if( sequence[sequence.length-1] != 'html.dragover' ) {
sequence[sequence.length] = 'html.dragover';
}
};
document.ondragenter = document.ondragleave = document.ondragover = document.ondragleave = function (e) {
if( e.target != this ) { return; }
sequence[sequence.length] = 'document.'+e.type;
};
orange.ondragend = function (e) {
sequence = sequence.join('=>')
var desiredsequence = (['orange.dragenter','orange.dragover','html.dragenter','html.dragenter','orange.dragleave','html.dragover','blue.dragenter','html.dragover','orange.dragenter','html.dragleave','orange.dragover','orange.drop']).join('=>')
if( sequence == desiredsequence ) {
document.getElementsByTagName('div')[2].textContent = 'PASS';
} else {
document.getElementsByTagName('div')[2].textContent = 'FAIL, got: '+sequence+' instead of: '+desiredsequence;
}
};
};
]]></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>