[whatwg] Drag-and-drop feedback
david at davidflanagan.com
Mon Jan 31 15:36:35 PST 2011
I love the new dropzone attribute. Nice work. Here is one nit, and a
couple of questions
nit: One of your old examples near the beginning of the DnD section
involves class="dragzone", which seems confusing now that you've added
an attribute with the same zone. Maybe change that class to droppable?
Q1) Say I want to create a library to emulate dropzone today, because it
is just so much nicer than all the dragenter and dragleave stuff. In
order to do this right, I need to be able to tell if the browser already
supports dropzone. Will it work to test ("dropzone" in
I see the spec says:
> The dropzone attribute must reflect the content attribute of the same name.
But I'm not certain that that means a property must exist if the
attribute does not.
Q2) If I understand correctly, the dropzone attribute means that we no
longer *have* to write dragenter and dragleave handlers. But every
useful dropzone I've seen in practice provides some kind of feedback
(changes background color, e.g.) when it is "armed" and ready to accept
a drop. Is there any mechanism for doing this? If not, then that
really diminishes the value of dropzone. I can't see how I'd write
dragenter and dragleave handlers to change the background color of the
element and also rely on the dropzone attribute, since it seems to be
processed after dragenter/leave are triggered...
One approach would be to define dropzone_activate and
dropzone_deactivate events to handle this case. A better solution might
be to define a :dropzone-active CSS pseudo class, if you can coordinate
that with the CSS folks...
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