Is there a way to do drag-and-drop re-ordering of the preview elements in a dropzone.js instance?

Question

I have a dropzone.js instance on a web page with the following options:

autoProcessQueue:false
uploadMultiple:true
parallelUploads:20
maxFiles:20

Answer 1

Here's another option without any plugins. On the success event callback, you can do some manual sorting:

   var rows = $('#dropzoneForm').children('.dz-image-preview').get();

    rows.sort(function (row1, row2) {
        var Row1 = $(row1).children('.preview').find('img').attr('alt');   
        var Row2 = $(row2).children('.preview').find('img').attr('alt');
        if (Row1 < Row2) {
            return -1;
        }

        if (Row1 > Row2) {
            return 1;
        }
        return 0;
    });


    $.each(rows, function (index, row) {
        $('#dropzoneForm').append(row);
    });

Answer 2

I've got it working now using jquery-ui's sortable. The trick was to make sure to use the 'items' option in sortable to pick only the dz-preview elements, because dropzone.js has the dz-message element along with the dz-preview elements in the main container. Here's how my code looks:

The HTML:

<div id="image-dropzone" class="dropzone square">

The script:

$(function() {
    $("#image-dropzone").sortable({
        items:'.dz-preview',
        cursor: 'move',
        opacity: 0.5,
        containment: '#image-dropzone',
        distance: 20,
        tolerance: 'pointer'
    });
})

Answer 3

Besides the code from ralbatross you will need to set the order of the file queue of dropzone..

Something like:

$("#uploadzone").sortable({
    items: '.dz-preview',
    cursor: 'move',
    opacity: 0.5,
    containment: '#uploadzone',
    distance: 20,
    tolerance: 'pointer',
    stop: function () {

        var queue = uploadzone.files;
        $('#uploadzone .dz-preview .dz-filename [data-dz-name]').each(function (count, el) {           
            var name = el.getAttribute('data-name');
            queue.forEach(function(file) {
               if (file.name === name) {
                    newQueue.push(file);
               }
            });
        });

        uploadzone.files = newQueue;

    }
});

And remember that the file is processed async, i keep an hashtable for reference when the file is done and save the order at the end.

It doesn't work with duplicate filenames