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;
        }
    }
};

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