Drop event not firing in chrome

问题

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');
})

回答1:

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.

回答2:

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

回答3:

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.

来源：https://stackoverflow.com/questions/21339924/drop-event-not-firing-in-chrome