Question

I built a file upload allowing drag-n-drop.
I can detect when a file is being dragged over the draggable element, my problem is:
is it possible once i detect a file being dragged over the element – if its 1 file or multiple files?
(i want to allow single file uploads only – without allowing the user to drop multiple files).

Thanks a lot for the help,

Good day.

Answer 1

If you’ve used jQuery to register the drop handler then the detail is in the ev.originalEvent property:

function drop(ev) {
    int n = ev.originalEvent.dataTransfer.files.length;
}

However this won’t be available until the files are actually dropped – the dragenter event doesn’t populate that property.