Drop event not firing in chrome

It seems the drop event is not triggering when I would expect.

I assume that the drop event fires when an element that is being dragged is releases above the target element, but this doesn't seem to the the case.

What am I misunderstanding?

http://jsfiddle.net/LntTL/

$('.drop').on('drop dragdrop',function(){
    alert('dropped');
});
$('.drop').on('dragenter',function(){
    $(this).html('drop now').css('background','blue');
})
$('.drop').on('dragleave',function(){
    $(this).html('drop here').css('background','red');
})

In order to have the drop event occur on a div element, you must cancel the ondragenter and ondragover events. Using jquery and your code provided...

$('.drop').on('drop dragdrop',function(){
    alert('dropped');
});
$('.drop').on('dragenter',function(event){
    event.preventDefault();
    $(this).html('drop now').css('background','blue');
})
$('.drop').on('dragleave',function(){
    $(this).html('drop here').css('background','red');
})
$('.drop').on('dragover',function(event){
    event.preventDefault();
})

For more information, check out the MDN page.

You can get away with just doing an event.preventDefault() on the dragover event. Doing this will fire the drop event.

In order for the drop event to fire, you need to assign a dropEffect during the over event, otherwise the ondrop event will never get triggered:

$('.drop').on('dragover',function(event){
    event.preventDefault();
    event.dataTransfer.dropEffect = 'copy';  // required to enable drop on DIV
})
// Value for dropEffect can be one of: move, copy, link or none
// The mouse icon + behavior will change accordingly.

This isn't an actual answer but for some people like me who lack the discipline for consistency. Drop didn't fire for me in chrome when the effectAllowed wasnt the effect I had set for dropEffect. It did however work for me in Safari. This should be set like below:

ev.dataTransfer.effectAllowed = 'move';

Alternatively, effectAllowed can be set as all, but I would prefer to keep specificity where I can.

for a case when drop effect is move:

ev.dataTransfer.dropEffect = 'move';