Sortable tree structure for Hobo

0001 Sortable tree structure for Hobo .markdown

Sortable tree structure for Hobo

I like the ability to have draggable and sortable lists via acts-as-list in Hobo, but I needed more:

I had a hierarchical structure, like a category tree, that needed to be sortable. I wanted a drag and drop interface. Furthermore the updates should be immediate via Ajax. Because this can take a while for huge trees, the user should be informed clearly, but unobtrusively, when update started, when update suceeded and when it failed.

I found Hobo to be compatible with the Ancestry gem and it plays nicely with Nestable.js and Messenger.js and it doesn't break the Bootstrap look and feel too much.

The codi is heavily based on Nestable.js by David Bushell: http://dbushell.github.io/Nestable/ and Messenger.js by Benji: https://github.com/benjis/messengerjs-rails . Thanks to them and the awesome Hobo people.

app.de.yml

# I am part of /config/locales/app.de.yml

de:
  activerecord:
    attribute_help:
      category:
        updated: Kategoriebaum erfolgreich aktualisiert!
        updating: Kategoriebaum wird aktualisiert
        update_failed: Kategoriebaum konnte nicht aktualisiert werden!

application.dryml

<!-- I am /app/views/taglibs/application.dryml -->

<def tag="treeview">
  <li repeat data-id="#{h this.id}" class="dd-item dd3-item">
    <div class="dd-handle dd3-handle"></div>
    <div class="dd3-content"><a><%= h this.name %></a></div>
    <if test="&this.children">
      <ol class="dd-list">
        <treeview with="&this.children" />
      </ol>
    </if>
  </li>
</def>

application.js

// I am part of /app/assets/javascript/application.js

//...
//= require messenger
//= require messenger-theme-future
//...

application.scss

/* I am part of /app/assets/stylesheets/application.scss */

/* ... */
 *= require messenger
 *= require messenger-spinner
 *= require messenger-theme-future
/* ... */

categories_controller.rb

# I am /app/controllers/categories_controller.rb

require 'will_paginate/array'

class Admin::CategoriesController < Admin::AdminSiteController

  hobo_model_controller

  auto_actions :all

  index_action :treereorder do
    @this = Category.roots.paginate(:page => 1, :per_page => 9999)
  end

  index_action :do_treereorder do
    categories_array = ActiveSupport::JSON.decode(params[:categories])
    parse_categories(categories_array, nil)
    if request.xhr?
      hobo_ajax_response
    end
  end

protected
  def parse_categories(categories_array, parent)
    categories_array.each_with_index do |category_hash, position|
      category = Category.find(category_hash["id"])
      category.update_attributes(position: position, parent_id: parent)
      parse_categories(category_hash["children"], category.id) if category_hash["children"]
    end
  end
end

category.rb

# I am /app/models/category.rb

class Category < ActiveRecord::Base

  hobo_model # Don't put anything above this

  fields do
    name  :string, :required
    ancestry :string, :index => true
    position :integer
    timestamps
  end

  attr_accessible :name, :ancestry, :position, :active,
                  :parent_id, :parent 
  has_ancestry
  never_show :ancestry

  validates :position, numericality: true

  # Permissions as usual 
  ...

end

do_treereorder.js.erb

<%# I am /views/admin/categories/do_treereorder.js.erb %>
<%# I could send data back, right now, I don't. %>

Gemfile

# I am part of Gemfile

#...
gem "ancestry"                                      # hierarchical data structures
gem "messengerjs-rails"                             # Messenger Javascript Framework Assets
#...

jquery.nestable.js

/* I am /app/assets/javascript/admin/jquery.nestable.js */

/*!
 * Nestable jQuery Plugin - Copyright (c) 2012 David Bushell - http://dbushell.com/
 * Dual-licensed under the BSD or MIT licenses
 */
;(function($, window, document, undefined)
{
    var hasTouch = 'ontouchstart' in window;

    /**
     * Detect CSS pointer-events property
     * events are normally disabled on the dragging element to avoid conflicts
     * https://github.com/ausi/Feature-detection-technique-for-pointer-events/blob/master/modernizr-pointerevents.js
     */
    var hasPointerEvents = (function()
    {
        var el    = document.createElement('div'),
            docEl = document.documentElement;
        if (!('pointerEvents' in el.style)) {
            return false;
        }
        el.style.pointerEvents = 'auto';
        el.style.pointerEvents = 'x';
        docEl.appendChild(el);
        var supports = window.getComputedStyle && window.getComputedStyle(el, '').pointerEvents === 'auto';
        docEl.removeChild(el);
        return !!supports;
    })();

    var eStart  = hasTouch ? 'touchstart'  : 'mousedown',
        eMove   = hasTouch ? 'touchmove'   : 'mousemove',
        eEnd    = hasTouch ? 'touchend'    : 'mouseup';
        eCancel = hasTouch ? 'touchcancel' : 'mouseup';

    var defaults = {
            listNodeName    : 'ol',
            itemNodeName    : 'li',
            rootClass       : 'dd',
            listClass       : 'dd-list',
            itemClass       : 'dd-item',
            dragClass       : 'dd-dragel',
            handleClass     : 'dd-handle',
            collapsedClass  : 'dd-collapsed',
            placeClass      : 'dd-placeholder',
            noDragClass     : 'dd-nodrag',
            emptyClass      : 'dd-empty',
            expandBtnHTML   : '<button data-action="expand" type="button">Expand</button>',
            collapseBtnHTML : '<button data-action="collapse" type="button">Collapse</button>',
            group           : 0,
            maxDepth        : 5,
            threshold       : 20
        };

    function Plugin(element, options)
    {
        this.w  = $(window);
        this.el = $(element);
        this.options = $.extend({}, defaults, options);
        this.init();
    }

    Plugin.prototype = {

        init: function()
        {
            var list = this;

            list.reset();

            list.el.data('nestable-group', this.options.group);

            list.placeEl = $('<div class="' + list.options.placeClass + '"/>');

            $.each(this.el.find(list.options.itemNodeName), function(k, el) {
                list.setParent($(el));
            });

            list.el.on('click', 'button', function(e) {
                if (list.dragEl || (!hasTouch && e.button !== 0)) {
                    return;
                }
                var target = $(e.currentTarget),
                    action = target.data('action'),
                    item   = target.parent(list.options.itemNodeName);
                if (action === 'collapse') {
                    list.collapseItem(item);
                }
                if (action === 'expand') {
                    list.expandItem(item);
                }
            });

            var onStartEvent = function(e)
            {
                var handle = $(e.target);
                if (!handle.hasClass(list.options.handleClass)) {
                    if (handle.closest('.' + list.options.noDragClass).length) {
                        return;
                    }
                    handle = handle.closest('.' + list.options.handleClass);
                }
                if (!handle.length || list.dragEl || (!hasTouch && e.button !== 0) || (hasTouch && e.touches.length !== 1)) {
                    return;
                }
                e.preventDefault();
                list.dragStart(hasTouch ? e.touches[0] : e);
            };

            var onMoveEvent = function(e)
            {
                if (list.dragEl) {
                    e.preventDefault();
                    list.dragMove(hasTouch ? e.touches[0] : e);
                }
            };

            var onEndEvent = function(e)
            {
                if (list.dragEl) {
                    e.preventDefault();
                    list.dragStop(hasTouch ? e.touches[0] : e);
                }
            };

            if (hasTouch) {
                list.el[0].addEventListener(eStart, onStartEvent, false);
                window.addEventListener(eMove, onMoveEvent, false);
                window.addEventListener(eEnd, onEndEvent, false);
                window.addEventListener(eCancel, onEndEvent, false);
            } else {
                list.el.on(eStart, onStartEvent);
                list.w.on(eMove, onMoveEvent);
                list.w.on(eEnd, onEndEvent);
            }

        },

        serialize: function()
        {
            var data,
                depth = 0,
                list  = this;
                step  = function(level, depth)
                {
                    var array = [ ],
                        items = level.children(list.options.itemNodeName);
                    items.each(function()
                    {
                        var li   = $(this),
                            item = $.extend({}, li.data()),
                            sub  = li.children(list.options.listNodeName);
                        if (sub.length) {
                            item.children = step(sub, depth + 1);
                        }
                        array.push(item);
                    });
                    return array;
                };
            data = step(list.el.find(list.options.listNodeName).first(), depth);
            return data;
        },

        serialise: function()
        {
            return this.serialize();
        },

        reset: function()
        {
            this.mouse = {
                offsetX   : 0,
                offsetY   : 0,
                startX    : 0,
                startY    : 0,
                lastX     : 0,
                lastY     : 0,
                nowX      : 0,
                nowY      : 0,
                distX     : 0,
                distY     : 0,
                dirAx     : 0,
                dirX      : 0,
                dirY      : 0,
                lastDirX  : 0,
                lastDirY  : 0,
                distAxX   : 0,
                distAxY   : 0
            };
            this.moving     = false;
            this.dragEl     = null;
            this.dragRootEl = null;
            this.dragDepth  = 0;
            this.hasNewRoot = false;
            this.pointEl    = null;
        },

        expandItem: function(li)
        {
            li.removeClass(this.options.collapsedClass);
            li.children('[data-action="expand"]').hide();
            li.children('[data-action="collapse"]').show();
            li.children(this.options.listNodeName).show();
        },

        collapseItem: function(li)
        {
            var lists = li.children(this.options.listNodeName);
            if (lists.length) {
                li.addClass(this.options.collapsedClass);
                li.children('[data-action="collapse"]').hide();
                li.children('[data-action="expand"]').show();
                li.children(this.options.listNodeName).hide();
            }
        },

        expandAll: function()
        {
            var list = this;
            list.el.find(list.options.itemNodeName).each(function() {
                list.expandItem($(this));
            });
        },

        collapseAll: function()
        {
            var list = this;
            list.el.find(list.options.itemNodeName).each(function() {
                list.collapseItem($(this));
            });
        },

        setParent: function(li)
        {
            if (li.children(this.options.listNodeName).length) {
                li.prepend($(this.options.expandBtnHTML));
                li.prepend($(this.options.collapseBtnHTML));
            }
            li.children('[data-action="expand"]').hide();
        },

        unsetParent: function(li)
        {
            li.removeClass(this.options.collapsedClass);
            li.children('[data-action]').remove();
            li.children(this.options.listNodeName).remove();
        },

        dragStart: function(e)
        {
            var mouse    = this.mouse,
                target   = $(e.target),
                dragItem = target.closest(this.options.itemNodeName);

            this.placeEl.css('height', dragItem.height());

            mouse.offsetX = e.offsetX !== undefined ? e.offsetX : e.pageX - target.offset().left;
            mouse.offsetY = e.offsetY !== undefined ? e.offsetY : e.pageY - target.offset().top;
            mouse.startX = mouse.lastX = e.pageX;
            mouse.startY = mouse.lastY = e.pageY;

            this.dragRootEl = this.el;

            this.dragEl = $(document.createElement(this.options.listNodeName)).addClass(this.options.listClass + ' ' + this.options.dragClass);
            this.dragEl.css('width', dragItem.width());

            // fix for zepto.js
            //dragItem.after(this.placeEl).detach().appendTo(this.dragEl);
            dragItem.after(this.placeEl);
            dragItem[0].parentNode.removeChild(dragItem[0]);
            dragItem.appendTo(this.dragEl);

            $(document.body).append(this.dragEl);
            this.dragEl.css({
                'left' : e.pageX - mouse.offsetX,
                'top'  : e.pageY - mouse.offsetY
            });
            // total depth of dragging item
            var i, depth,
                items = this.dragEl.find(this.options.itemNodeName);
            for (i = 0; i < items.length; i++) {
                depth = $(items[i]).parents(this.options.listNodeName).length;
                if (depth > this.dragDepth) {
                    this.dragDepth = depth;
                }
            }
        },

        dragStop: function(e)
        {
            // fix for zepto.js
            //this.placeEl.replaceWith(this.dragEl.children(this.options.itemNodeName + ':first').detach());
            var el = this.dragEl.children(this.options.itemNodeName).first();
            el[0].parentNode.removeChild(el[0]);
            this.placeEl.replaceWith(el);

            this.dragEl.remove();
            this.el.trigger('change');
            if (this.hasNewRoot) {
                this.dragRootEl.trigger('change');
            }
            this.reset();
        },

        dragMove: function(e)
        {
            var list, parent, prev, next, depth,
                opt   = this.options,
                mouse = this.mouse;

            this.dragEl.css({
                'left' : e.pageX - mouse.offsetX,
                'top'  : e.pageY - mouse.offsetY
            });

            // mouse position last events
            mouse.lastX = mouse.nowX;
            mouse.lastY = mouse.nowY;
            // mouse position this events
            mouse.nowX  = e.pageX;
            mouse.nowY  = e.pageY;
            // distance mouse moved between events
            mouse.distX = mouse.nowX - mouse.lastX;
            mouse.distY = mouse.nowY - mouse.lastY;
            // direction mouse was moving
            mouse.lastDirX = mouse.dirX;
            mouse.lastDirY = mouse.dirY;
            // direction mouse is now moving (on both axis)
            mouse.dirX = mouse.distX === 0 ? 0 : mouse.distX > 0 ? 1 : -1;
            mouse.dirY = mouse.distY === 0 ? 0 : mouse.distY > 0 ? 1 : -1;
            // axis mouse is now moving on
            var newAx   = Math.abs(mouse.distX) > Math.abs(mouse.distY) ? 1 : 0;

            // do nothing on first move
            if (!mouse.moving) {
                mouse.dirAx  = newAx;
                mouse.moving = true;
                return;
            }

            // calc distance moved on this axis (and direction)
            if (mouse.dirAx !== newAx) {
                mouse.distAxX = 0;
                mouse.distAxY = 0;
            } else {
                mouse.distAxX += Math.abs(mouse.distX);
                if (mouse.dirX !== 0 && mouse.dirX !== mouse.lastDirX) {
                    mouse.distAxX = 0;
                }
                mouse.distAxY += Math.abs(mouse.distY);
                if (mouse.dirY !== 0 && mouse.dirY !== mouse.lastDirY) {
                    mouse.distAxY = 0;
                }
            }
            mouse.dirAx = newAx;

            /**
             * move horizontal
             */
            if (mouse.dirAx && mouse.distAxX >= opt.threshold) {
                // reset move distance on x-axis for new phase
                mouse.distAxX = 0;
                prev = this.placeEl.prev(opt.itemNodeName);
                // increase horizontal level if previous sibling exists and is not collapsed
                if (mouse.distX > 0 && prev.length && !prev.hasClass(opt.collapsedClass)) {
                    // cannot increase level when item above is collapsed
                    list = prev.find(opt.listNodeName).last();
                    // check if depth limit has reached
                    depth = this.placeEl.parents(opt.listNodeName).length;
                    if (depth + this.dragDepth <= opt.maxDepth) {
                        // create new sub-level if one doesn't exist
                        if (!list.length) {
                            list = $('<' + opt.listNodeName + '/>').addClass(opt.listClass);
                            list.append(this.placeEl);
                            prev.append(list);
                            this.setParent(prev);
                        } else {
                            // else append to next level up
                            list = prev.children(opt.listNodeName).last();
                            list.append(this.placeEl);
                        }
                    }
                }
                // decrease horizontal level
                if (mouse.distX < 0) {
                    // we can't decrease a level if an item preceeds the current one
                    next = this.placeEl.next(opt.itemNodeName);
                    if (!next.length) {
                        parent = this.placeEl.parent();
                        this.placeEl.closest(opt.itemNodeName).after(this.placeEl);
                        if (!parent.children().length) {
                            this.unsetParent(parent.parent());
                        }
                    }
                }
            }

            var isEmpty = false;

            // find list item under cursor
            if (!hasPointerEvents) {
                this.dragEl[0].style.visibility = 'hidden';
            }
            this.pointEl = $(document.elementFromPoint(e.pageX - document.body.scrollLeft, e.pageY - (window.pageYOffset || document.documentElement.scrollTop)));
            if (!hasPointerEvents) {
                this.dragEl[0].style.visibility = 'visible';
            }
            if (this.pointEl.hasClass(opt.handleClass)) {
                this.pointEl = this.pointEl.parent(opt.itemNodeName);
            }
            if (this.pointEl.hasClass(opt.emptyClass)) {
                isEmpty = true;
            }
            else if (!this.pointEl.length || !this.pointEl.hasClass(opt.itemClass)) {
                return;
            }

            // find parent list of item under cursor
            var pointElRoot = this.pointEl.closest('.' + opt.rootClass),
                isNewRoot   = this.dragRootEl.data('nestable-id') !== pointElRoot.data('nestable-id');

            /**
             * move vertical
             */
            if (!mouse.dirAx || isNewRoot || isEmpty) {
                // check if groups match if dragging over new root
                if (isNewRoot && opt.group !== pointElRoot.data('nestable-group')) {
                    return;
                }
                // check depth limit
                depth = this.dragDepth - 1 + this.pointEl.parents(opt.listNodeName).length;
                if (depth > opt.maxDepth) {
                    return;
                }
                var before = e.pageY < (this.pointEl.offset().top + this.pointEl.height() / 2);
                    parent = this.placeEl.parent();
                // if empty create new list to replace empty placeholder
                if (isEmpty) {
                    list = $(document.createElement(opt.listNodeName)).addClass(opt.listClass);
                    list.append(this.placeEl);
                    this.pointEl.replaceWith(list);
                }
                else if (before) {
                    this.pointEl.before(this.placeEl);
                }
                else {
                    this.pointEl.after(this.placeEl);
                }
                if (!parent.children().length) {
                    this.unsetParent(parent.parent());
                }
                if (!this.dragRootEl.find(opt.itemNodeName).length) {
                    this.dragRootEl.append('<div class="' + opt.emptyClass + '"/>');
                }
                // parent root list has changed
                if (isNewRoot) {
                    this.dragRootEl = pointElRoot;
                    this.hasNewRoot = this.el[0] !== this.dragRootEl[0];
                }
            }
        }

    };

    $.fn.nestable = function(params)
    {
        var lists  = this,
            retval = this;

        lists.each(function()
        {
            var plugin = $(this).data("nestable");

            if (!plugin) {
                $(this).data("nestable", new Plugin(this, params));
                $(this).data("nestable-id", new Date().getTime());
            } else {
                if (typeof params === 'string' && typeof plugin[params] === 'function') {
                    retval = plugin[params]();
                }
            }
        });

        return retval || lists;
    };

})(window.jQuery || window.Zepto, window, document);

nestable.css

/* I am /app/assets/stylesteets/application/nestable.css */

.dd { position: relative; display: block; margin: 0; padding: 0; max-width: 600px; list-style: none; font-size: 13px; line-height: 20px; }

.dd-list { display: block; position: relative; margin: 0; padding: 0; list-style: none; }
.dd-list .dd-list { padding-left: 30px; }
.dd-collapsed .dd-list { display: none; }

.dd-item,
.dd-empty,
.dd-placeholder { display: block; position: relative; margin: 0; padding: 0; min-height: 20px; font-size: 13px; line-height: 20px; }

.dd-handle { display: block; height: 30px; margin: 5px 0; padding: 5px 10px; color: #333; text-decoration: none; font-weight: bold; border: 1px solid #ccc;
    background: #fafafa;
    background: -webkit-linear-gradient(top, #fafafa 0%, #eee 100%);
    background:    -moz-linear-gradient(top, #fafafa 0%, #eee 100%);
    background:         linear-gradient(top, #fafafa 0%, #eee 100%);
    -webkit-border-radius: 3px;
            border-radius: 3px;
    box-sizing: border-box; -moz-box-sizing: border-box;
}
.dd-handle:hover { color: #2ea8e5; background: #fff; }

.dd-item > button { display: block; position: relative; cursor: pointer; float: left; width: 25px; height: 20px; margin: 5px 0; padding: 0; text-indent: 100%; white-space: nowrap; overflow: hidden; border: 0; background: transparent; font-size: 12px; line-height: 1; text-align: center; font-weight: bold; }
.dd-item > button:before { content: '+'; display: block; position: absolute; width: 100%; text-align: center; text-indent: 0; }
.dd-item > button[data-action="collapse"]:before { content: '-'; }

.dd-placeholder,
.dd-empty { margin: 5px 0; padding: 0; min-height: 30px; background: #f2fbff; border: 1px dashed #b6bcbf; box-sizing: border-box; -moz-box-sizing: border-box; }
.dd-empty { border: 1px dashed #bbb; min-height: 100px; background-color: #e5e5e5;
    background-image: -webkit-linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff),
                      -webkit-linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff);
    background-image:    -moz-linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff),
                         -moz-linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff);
    background-image:         linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff),
                              linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff);
    background-size: 60px 60px;
    background-position: 0 0, 30px 30px;
}

.dd-dragel { position: absolute; pointer-events: none; z-index: 9999; }
.dd-dragel > .dd-item .dd-handle { margin-top: 0; }
.dd-dragel .dd-handle {
    -webkit-box-shadow: 2px 4px 6px 0 rgba(0,0,0,.1);
            box-shadow: 2px 4px 6px 0 rgba(0,0,0,.1);
}

/* Nestable Extras */

.nestable-lists { display: block; clear: both; padding: 30px 0; width: 100%; border: 0; border-top: 2px solid #ddd; border-bottom: 2px solid #ddd; }

#nestable-menu { padding: 0; margin: 20px 0; }

#nestable-output,
#nestable2-output { width: 100%; height: 7em; font-size: 0.75em; line-height: 1.333333em; font-family: Consolas, monospace; padding: 5px; box-sizing: border-box; -moz-box-sizing: border-box; }

#nestable2 .dd-handle {
    color: #fff;
    border: 1px solid #999;
    background: #bbb;
    background: -webkit-linear-gradient(top, #bbb 0%, #999 100%);
    background:    -moz-linear-gradient(top, #bbb 0%, #999 100%);
    background:         linear-gradient(top, #bbb 0%, #999 100%);
}
#nestable2 .dd-handle:hover { background: #bbb; }
#nestable2 .dd-item > button:before { color: #fff; }

@media only screen and (min-width: 700px) {

    .dd { float: left; width: 48%; }
    .dd + .dd { margin-left: 2%; }

}

.dd-hover > .dd-handle { background: #2ea8e5 !important; }

/* Nestable Draggable Handles */

.dd3-content { display: block; height: 30px; margin: 5px 0; padding: 5px 10px 5px 40px; color: #333; text-decoration: none; font-weight: bold; border: 1px solid #ccc;
    background: #fafafa;
    background: -webkit-linear-gradient(top, #fafafa 0%, #eee 100%);
    background:    -moz-linear-gradient(top, #fafafa 0%, #eee 100%);
    background:         linear-gradient(top, #fafafa 0%, #eee 100%);
    -webkit-border-radius: 3px;
            border-radius: 3px;
    box-sizing: border-box; -moz-box-sizing: border-box;
}
.dd3-content:hover { color: #2ea8e5; background: #fff; }

.dd-dragel > .dd3-item > .dd3-content { margin: 0; }

.dd3-item > button { margin-left: 30px; }

.dd3-handle { position: absolute; margin: 0; left: 0; top: 0; cursor: pointer; width: 30px; text-indent: 100%; white-space: nowrap; overflow: hidden;
    border: 1px solid #aaa;
    background: #ddd;
    background: -webkit-linear-gradient(top, #ddd 0%, #bbb 100%);
    background:    -moz-linear-gradient(top, #ddd 0%, #bbb 100%);
    background:         linear-gradient(top, #ddd 0%, #bbb 100%);
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}
.dd3-handle:before { content: '≡'; display: block; position: absolute; left: 0; top: 3px; width: 100%; text-align: center; text-indent: 0; color: #fff; font-size: 20px; font-weight: normal; }
.dd3-handle:hover { background: #ddd; }

treereorder.dryml

<!-- I am /views/admin/categories/treereorder.dryml -->

<index-page>
  <collection: replace>
    <div class="dd">
      <ol class="dd-list">
        <treeview with="&this" />
      </ol>
    </div>
  </collection:>
</index-page>

<script>
  $('.dd').nestable({ maxDepth: 99, distance: 5 });
  $('.dd').nestable('collapseAll');
  $('.dd').on('change', function() {
    Messenger().run({
      progressMessage: '<%= t "activerecord.attribute_help.category.updating" %> ...',
      successMessage: '<%= t "activerecord.attribute_help.category.updated" %>',
      errorMessage: '<%= t "activerecord.attribute_help.category.update_failed" %>'
    },{
      url:"/admin/categories/do_treereorder",
      data: 'categories=' + JSON.stringify($('.dd').nestable('serialize')),
      dataType: 'script',
    });
  });
</script>