jQuery UI Draggable - Droppables in an iFrame

jquery-ui-droppable-iframe-fix.js

// Create new object to cache iframe offsets
$.ui.ddmanager.frameOffsets = {};
 
// Override the native `prepareOffsets` method. This is almost
// identical to the un-edited method, except for the last part!
$.ui.ddmanager.prepareOffsets = function (t, event) {
    var i, j,
        m = $.ui.ddmanager.droppables[t.options.scope] || [],
        type = event ? event.type : null, // workaround for #2317
        list = (t.currentItem || t.element).find(":data(ui-droppable)").addBack(),
        doc, frameOffset;
 
    droppablesLoop: for (i = 0; i < m.length; i++) {
 
        //No disabled and non-accepted
        if (m[i].options.disabled || (t && !m[i].accept.call(m[i].element[0], (t.currentItem || t.element)))) {
            continue;
        }
 
        // Filter out elements in the current dragoged item
        for (j = 0; j < list.length; j++) {
            if (list[j] === m[i].element[0]) {
                m[i].proportions().height = 0;
                continue droppablesLoop;
            }
        }
 
        m[i].visible = m[i].element.css("display") !== "none";
        if (!m[i].visible) {
            continue;
        }
 
        //Activate the droppable if used directly from draggables
        if (type === "mousedown") {
            m[i]._activate.call(m[i], event);
        }
        
        // Re-calculate offset
        m[i].offset = m[i].element.offset();

        // Re-calculate proportions (jQuery UI ~1.10 introduced a `proportions` cache method, so support both here!)
        proportions = { width: m[i].element[0].offsetWidth, height: m[i].element[0].offsetHeight };
        typeof m[i].proportions === 'function' ? m[i].proportions(proportions) : (m[i].proportions = proportions);
        
        /* ============ Here comes the fun bit! =============== */
 
        // If the element is within an another document...
        if ((doc = m[i].document[0]) !== document) {
            // Determine in the frame offset using cached offset (if already calculated)
            frameOffset = $.ui.ddmanager.frameOffsets[doc];
            if (!frameOffset) {
                // Calculate and cache the offset in our new `$.ui.ddmanager.frameOffsets` object
                frameOffset = $.ui.ddmanager.frameOffsets[doc] = $(
                    // Different browsers store it on different properties (IE...)
                    (doc.defaultView || doc.parentWindow).frameElement
                ).offset();
            }
 
            // Add the frame offset to the calculated offset
            m[i].offset.left += frameOffset.left;
            m[i].offset.top += frameOffset.top;
        }
    }
};

Note the $.ui.ddmanager.frameOffsets code that caches the [i]frame's offset in the document. If this changes regularly, you may need to prevent caching this and instead re-evaluate the .offset() call on the frameElement each time the .prepareOffsets() method is run.

не работает

iFrameFix option for draggable/droppable does all that things from-the-box, i don't see any advantages of above
What will be really helpful is a fix that will help to calculate drop position correctly if there is a scroll inside iframe. For now, there is jquery ui bug http://bugs.jqueryui.com/ticket/9301, which is opened for now and they don't want to fix it before 2.0

This almost fixes my issue!
Before your code, with iframe fix I could drag over my iframes, but I couldn't drop on them at all.
Now it drops onto my iframes!
But, my droppable code seems to get called once for each of my 3 drop targets. I am not sure why that is, or what I can do about it. I am guessing it is in the code here?

    m[i].proportions({ width: m[i].element[0].offsetWidth, height: m[i].element[0].offsetHeight });

Thanks for submitting this awesome code!

I tested with the tolerance: "fit" option now, and it doesn't go into all 3 now, but they always go into the middle one, even if they are over one of the side ones instead.

@mikhail-eremin, the iFrameFix option does not address the issue that this Gist provides a solution to, as taken from their description:

iFrameFix: Prevent iframes from capturing the mousemove events during a drag. Useful in combination with the cursorAt option, or in any case where the mouse cursor may not be over the
helper.

This Gist provides a mechanism for having droppables in a completely separate frame, but still allowing the parent frame's draggables to register them as allowed targets.

@karlhenselin not sure what you mean. If you share a reduced test case on codepen.io or similar, we might be able to help.

Updated code to clean up and fix some small issues with previous fix.

Great work man!
I have forked your work, but I can't make an pull request.
I try to use your fix for more iframe drag and drop, but I found an issue: it uses always the offset of the first registered iframe. The problem is in the storing of the offsets. I have changed the '$.ui.ddmanager.frameOffsets[doc]' in '$.ui.ddmanager.frameOffsets[frame.id]' where frame is the frameElement. Give a look to my fork for see the code ;-)

Great!
save me a lot of time. Thanks.

Hi Craig,

Can you specify what version of jQuery you targeted with this fix? It's not clear from your post.

thanks

EDIT: Author originally posted about this on his blog, here: http://blog.craigsworks.com/jquery-ui-draggable-droppables-in-an-iframe/

Specifically this fix was for jquery UI 1.8+

This is a great fix and saved me a lot of issues. There's just one further fix I made to it - in my app I drag elements both into an iframe from the main doc, and within the iframe itself. The current code will apply the offset fix to elements dragged inside the iframe, causing an over-correction to the other side.

The solution is simple - instead of checking whether the droppable is in a different document than the main doc, compare it to the draggable element's document:

Replace line 48 with this:

 var draggableDocument = t.element[0].ownerDocument;
 if ((doc = m[i].document[0]) !== draggableDocument) {

Some times I get this weird error

Uncaught TypeError: Cannot read property 'ddmanager' of undefined

Anybody has fix?

Hi, I have some issues in droppable for example i have a iframe that is having inside mouse move event and parent page having draggable elements after using iframefix true, i am able to over the inside iframe droppable area but mouse move event not working