丢弃事件不防止默认

Question

I've the following: http://jsfiddle.net/KywJT/

function dragEnter(evt) {
    evt.stopPropagation();
    evt.preventDefault();
    $(evt.target).addClass('over');
}

function dragLeave(evt) {
    evt.stopPropagation();
    evt.preventDefault();
    $(evt.target).removeClass('over');
}

function drop(evt) {
   evt.stopPropagation();
   evt.preventDefault();
   $(evt.target).removeClass('over');
}

jQuery( function ( $ ) {

  var $box = $( "#box" );
  $box.bind("dragenter", dragEnter);
  $box.bind("dragleave", dragLeave);
  $box.bind("drop", drop);
});

I'm using Chrome version 24.0.1312.52 m and last jQuery (1.8.3). When I drop a file into the box, browser is not preventing default beaviour. Can you please help me?

PS dragexit is deprecated correct?

Answer 1

If you want the drop event to be fired in Google Chrome, a dragover listener has to be defined before, even if the function doesn't do anything at all. I don't know why, it's weird... but clearly identified and easy to reproduce :) Lost 2 hours on that sh*t yesterday :/ hope this helps

Answer 2

This should fix the issue for you.

jQuery( function ( $ ) {
    var $box = $( "#box" );
    $box.bind("dragenter", dragEnter);
    $box.bind("dragleave", dragLeave);
    $box.bind("drop", drop);

    $(document).bind('dragover', function (e) {
         e.preventDefault();
    });
});

Answer 3

This is an old question but I used answers to this question and wrote the code I want:

HTML:

<div id="image_holder" ondragover="dragEnter(this,event)"></div>

jQuery:

function dragEnter(a,evt) {
    evt.stopPropagation();
    evt.preventDefault();
    $(evt.target).addClass('over');

    $(a).bind("dragleave", dragLeave);
    $(a).bind("drop", drop);

    $(document).bind('dragover', function (e) {
        e.stopPropagation();
        e.preventDefault();
    });
    return false;
}

function dragLeave(evt) {
    evt.stopPropagation();
    evt.preventDefault();
    $(evt.target).removeClass('over');
    return false;
}

function drop(evt) {
    evt.stopPropagation();
    evt.preventDefault();
    $(evt.target).removeClass('over');
}

This has the privilege you can use it easily for different elements in page.