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Jquery UI droppable propagates on overlapping floated sibling

I'm writing an app that let's you drag elements from a column on the right, and drop them on a column on the left, and once you drop them the dragged element (a clone of it) is appended to the element where it's dropped. You can also drag and drop a class that floats the element (basically you can float the elements).
The problem is that when you drop two elements on the same container, that is: you make two siblings, and then float one of them, every new element you add to the floated element is also added to the overlapping sibling.
Check this fiddle: https://jsfiddle.net/5265cg7a/11/
$(function() {
function droppingFunc(event, ui) {
if (ui.helper.hasClass("add-elem")) {
event.stopPropagation();
$(event.target)
.append($(ui.draggable.clone().addClass("testing someHeight someMargin clearFix"))
.clone()
.html("")
.droppable({
drop: droppingFunc,
greedy: true,
tolerance: "pointer"
})
);
} else if (ui.helper.hasClass("add-class")) {
var classToAdd = ui.helper.attr("title");
$(this)
.addClass(classToAdd);
}
}
$(".drag-elem").draggable({
helper: "clone"
});
$(".drop-elem").droppable({
drop: droppingFunc,
greedy: true,
tolerance: "pointer"
});
});
Do the follwing and you´ll se the bug:
Add two siblings by dragging two times the "Add an element" button from the right column and dropping it on the left area.
Float one of them by dragging the "Float an element" button and dropping it in one of the previously created elements.
Add a new child element to the floated sibling. You'll see that a new child element is simultaneously added to the overlapping sibling.
Obviously what i want is that the dropped element only gets added to the element where its being dropped and not to any siblings.
I look forward to all your answers and i thank you in advance for all the help!!

jQuery UI : draggable behaviour while dropping object using tolerance touch

When using jQuery Ui draggable tolerance touch, I am facing problem like when the element touches two droppable elements of same class it is dropped in both the droppables. I have added a image below to describe the problem.
This can be done by using tolerance pointer. But expected behavior is when draggable hovers any point of the droppable it should be activated to drop.
How can I drop only on any one of the element either this or that?

Heres the working fiddle:
http://jsfiddle.net/tE94H/
To make it short:
drop: function (event, ui) {
$(this).droppable('destroy');
}
does the trick. Keep in mind, the dropped Elements is the one, where the mousecursor is closer to.

Jquery how to specify which droppable should be used with nested droppable elements

I have a small problem which i can't seem to solve myself.
Look at this fiddle:JSfiddle
This is a basic example of the problem I have.
I have a large div which is a droppable area. Inside this droppable area are multiple other droppable areas.
The inner droppable area should walk trough its code when the element is dropped. Instead the code from the outer div seems to run.
Am i doing something wrong? The area around the divs should stay this way because elements can be placed here (not officially dropped).
I hope my question is clear enough, but I think the fiddler speaks for itself.
P.S. - resizing in this example isn't functioning but is functioning in my development environment.
Rusty and Mark,
Thank you for your replies.
I'm sorry for the confusing resizer. I just removed that from the code.
New Fiddler
Just to clarify things. The box div is a container which has multiple images in it. I am trying to achieve the following:
http://postimage.org/image/qwhtik04f/
The grey dotted boxes are the dropbox2 div from my example.
The space around those drop boxes are dropbox div.
The space with the board is the only place where images may be dropped without anything happening.
The dragged images can snap back to the dropbox2 divs.
If the images are dragged onto the dropbox div, the images should revert.

Setting the greedy: true option on the inner droppable will prevent the event from happening on the outer droppable:
jQuery('#dropbox2').droppable({
greedy: true,
drop: function(event, ui) {
// ...
}
});

Your code has this for the outer <div>:
$("#dropbox").droppable({
drop: function(event, ui) {
ui.draggable.draggable( 'option', 'revert', true );
}
});
This says to set the revert option to true when you drag into the outer <div>. However, when you drop in the smaller <div>, the option is still set to true. All you need to do is change the revert value on your draggable element after a successful drop in your inner <div>:
$("#dropbox2").droppable({
drop: function(event, ui) {
ui.draggable.position( { of: $(this), my: 'center', at: 'center' } );
// Add this line
ui.draggable.draggable( 'option', 'revert', false );
}
});
Update:
Mark pointed out that my solution doesn't stop the propagation of the event to the parent container. As his answer shows, you need to add greedy: true in your initial options. The jQuery documentation says:
If true, will prevent event propagation on nested droppables.
That sounds like what you're looking for. You still need to change the revert property on your draggable, since greedy is only set on your droppables and won't affect your draggable reactions.

jQuery sortable container scroll div with overflow auto

I have been pulling my hair out trying to make this work.
I have two connected sortables, defined like so:
var sortlists = $("#List1, #List2").sortable(
{
appendTo: 'body',
tolerance: 'pointer',
connectWith: '#List1, #List2',
revert: 'invalid',
forceHelperSize: true,
helper: 'clone',
scroll: true
});
Here is a link to an example of jsfiddle
Because of the page setup, both sortables are being contained in div's with overflow: auto they are also wrapped in parent containers with overflow set to hidden. For arguments sake, lets say there is no way around that.
Is there a way to make the container element scroll when the helper is being positioned towards the lower or upper edge of the container?
Any help would be appreciated!

With helper:'original', I get the scrolling behaviour you seek, (in Opera 11.61).
forked fiddle
Edit: Here's a version of the fiddle with "ganged-scrolling"

I think this is what you want. Drag from div (with scrollable) to div (with scrollable) without the dragged item appearing behind the div.
http://jsfiddle.net/nURN5/1/
.document.body.appendChild //required to add code with link...
The next best approach would be to actually drag a clone of the item...

The forked fiddle with "ganged-scrolling" unfortunately exhibits the very nasty side effect of constraining (visually) the selected item to it's own div.

How to make a jQuery draggable actually snap to an equally sized droppable

I have my draggable and droppable setup correctly using jquery-ui. They are both the same size, so the draggable should fit nicely on to the droppable. Is there any way to make the draggable snap in to the middle of the droppable so as to completely cover it? It seems if I use the snap: parameter it just snaps to the edges, and not necessarily to the middle of the droppable.

Would this not do the job, give or take a pixel:
drop: function(event, ui) {
$(ui.draggable).offset($(this).offset());
}

Or since you're already using jQuery UI, there's the position method
drop: function(event, ui) {
ui.draggable.position({of: $(this)});
}