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I want to overlay a div over the viewport when the user drags a file onto the window.
However, I'm having trouble with the event propagation. When I set the overlay to display: block it appears to fire off a dragleave event and then another dragenter and then another dragleave again, so it's always in a post-dragleave state. Of course I call e.stopPropagation() and e.preventDefault() on the event object, but it doesn't seem to make a difference.
The console.log() output when you drag something over the window:
dragenter
dragenter
dragleave
dragenter
dragleave
The css. #overlay is set to display: none by default, but will show if body has the dragenter class:
body {
position: absolute;
height: auto;
top: 0;
left: 0;
right: 0;
bottom: 0;
margin: 0;
padding: 0;
}
#overlay {
position: absolute;
height: auto;
width: auto;
top: 0;
left: 0;
right: 0;
bottom: 0;
background: url(bg.png) repeat-x top right, url(bg.png) repeat-x bottom left, url(bg.png) repeat-y top right, url(bg.p
ng) repeat-y bottom left;
display: none;
}
body.dragenter #overlay {
display: block;
}
The javascript. Add the 'dragenter' class on dragenter and removes it on dragleave:
$(document).on('dragenter', function (e) {
e.stopPropagation();
e.preventDefault();
console.log('dragenter');
$(document.body).addClass('dragenter');
});
$(document).on('dragleave', function (e) {
e.stopPropagation();
e.preventDefault();
console.log('dragleave';
$(document.body).removeClass('dragenter');
});
The html:
<body>
<div id="overlay">...</div>
...
</body>
413
Your overlay takes up the whole document size, when you drag in, it fills up its space and your mouse is effectively taken out of the body and is now over the overlay. This triggers a mouseleave/mouseenter loop. To achieve what you are after, you may want to bind the event to a transparent overlay with a high z-index over the visible overlay which has a lower z-index. This would keep the event in the highest element.
Example:
http://jsfiddle.net/scottux/z7yaB/
85
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