nestable

bullet-collapsed.svg

bullet-hover.svg

bullet.svg

collection.html

<textarea id="nestable3-output"></textarea>

<div style="height: 50px" id="nestable3-focus-bar">
  <button type="button">close</button>
  <span></span>
</div>

<div class="dd" id="nestable3">
  <ol class="dd-list">
    <li class="dd-item" data-id="13">
      <div class="dd-handle"></div>
      <div class="dd-content">Item 13</div>
    </li>
    <li class="dd-item" data-id="14">
      <div class="dd-handle"></div>
      <div class="dd-content">Item 14</div>
    </li>
    <li class="dd-item" data-id="15">
      <div class="dd-handle"></div>
      <div class="dd-content">Item 15</div>
      <ol class="dd-list">
        <li class="dd-item" data-id="16">
          <div class="dd-handle"></div>
          <div class="dd-content">Item 16</div>
        </li>
        <li class="dd-item" data-id="17">
          <div class="dd-handle"></div>
          <div class="dd-content">Item 17</div>
        </li>
        <li class="dd-item" data-id="18">
          <div class="dd-handle"></div>
          <div class="dd-content">Item 18</div>
          <ol class="dd-list">
            <li class="dd-item" data-id="834">
              <div class="dd-handle"></div>
              <div class="dd-content">Item 834</div>
              <ol class="dd-list">
                <li class="dd-item" data-id="6546">
                  <div class="dd-handle"></div>
                  <div class="dd-content">Item 6546</div>
                  <ol class="dd-list">
                    <li class="dd-item" data-id="145646">
                      <div class="dd-handle"></div>
                      <div class="dd-content">Item 145646</div>
                      <ol class="dd-list">
                        <li class="dd-item" data-id="456">
                          <div class="dd-handle"></div>
                          <div class="dd-content">Item 456</div>
                        </li>
                      </ol>
                    </li>
                  </ol>
                </li>
              </ol>
            </li>
          </ol>
        </li>
      </ol>
    </li>
  </ol>
</div>

<div class="dd" data-shadow="nestable3" id="nestable3-shadow">
  <ol class="dd-list"></ol>
</div>

<script>
  $(document).ready(function () {

    var updateOutput = function (e) {

      var list = e.length ? e : $(e.target),
          output = list.data('output');
      if (window.JSON) {
        output.val(window.JSON.stringify(list.nestable('serialize')));//, null, 2));
      } else {
        output.val('JSON browser support required for this demo.');
      }
    };

    // activate Nestable for list 2
    $('#nestable3').nestable({
          group: 1
        })
        .on('change', updateOutput);

    updateOutput($('#nestable3').data('output', $('#nestable3-output')));

    $('#nestable3').nestable();

  });
</script>

nestable.css

.dd {
  font-size:16px;
  font-weight:normal;
  display: block;
  line-height: 20px;
  list-style: none;
  max-width: 600px;
  padding: 0;
  position: relative;
}

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

.dd-list .dd-list {
  padding-left: 10px;
  margin-left: 15px;
  border-left: 1px solid #eee;
}

.dd-collapsed .dd-list {
  display: none;
}

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

.dd-handle {
  position: absolute;
  top: 0;
  left: 0;
  width: 30px;
  height: 30px;
  display: block;
  cursor: pointer;
  overflow: hidden;
  background: transparent url(bullet.svg) center no-repeat;
  background-size: 18px 18px;
}
.dd-collapsed .dd-handle:hover,
.dd-handle:hover {
  background: transparent url(bullet-hover.svg) center no-repeat;
  background-size: 18px 18px;
}

.dd-collapsed .dd-handle {
  background: transparent url(bullet-collapsed.svg) center no-repeat;
  background-size: 18px 18px;
}

.dd-item > button {
  position: absolute;
  left: -15px;
  display: block;
  background: transparent;
  border: 0;
  cursor: pointer;
  font-weight: bold;
  line-height: 30px;
  height: 30px;
  padding: 0;
  overflow: hidden;
  text-align: center;
  text-indent: 100%;
  white-space: nowrap;
  width: 25px;
  color: transparent;
}

.dd-item:hover > button {
  color: #000;
}

.dd-item > button:before {
  content: '+';
  display: block;
  position: absolute;
  text-align: center;
  text-indent: 0;
  width: 100%;
  z-index: 999;
}

.dd-item > button[data-action="collapse"]:before {
  content: '-';
}

.dd-placeholder,
.dd-empty {
  margin: 5px 0;
  min-height: 30px;
  padding: 0;
}

.dd-state-move .dd-placeholder,
.dd-state-move .dd-empty {
  background: #eee;
  border-color: #eee;
}

.dd-empty {
  background: #e5e5e5 0 0, 30px 30px;
  background-size: 60px 60px;
  border: 1px dashed #bbb;
  min-height: 100px;
}

.dd-dragel {
  pointer-events: none;
  position: absolute;
  z-index: 9999;
}


.dd-content {
  cursor: pointer;
  padding-left: 30px;
  color: #333;
  height: 30px;
  line-height: 30px;
  text-decoration: none;
  text-overflow: ellipsis;
}

.dd-content:hover {
  color: #2ea8e5;
}

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

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 document;

  /**
   * 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 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: 50,
    threshold: 20
  };

  function Plugin(element, options) {
    this.w = $(document);
    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) {
          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) {
          return;
        }

        list.isTouch = /^touch/.test(e.type);
        if (list.isTouch && e.touches.length !== 1) {
          return;
        }

        e.preventDefault();
        list.dragStart(e.touches ? e.touches[0] : e);
      };

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

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

      if (hasTouch) {
        list.el[0].addEventListener('touchstart', onStartEvent, false);
        window.addEventListener('touchmove', onMoveEvent, false);
        window.addEventListener('touchend', onEndEvent, false);
        window.addEventListener('touchcancel', onEndEvent, false);
      }

      list.el.on('mousedown', onStartEvent);
      list.w.on('mousemove', onMoveEvent);
      list.w.on('mouseup', 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.isTouch = false;
      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);

      // add state class to the root
      this.el.attr('class', this.options.rootClass + ' dd-state-start');

      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());

      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) {
      // dose mouse moved
      var hasMoved = this.el.hasClass('dd-state-move');

      // add state class to the root
      this.el.attr('class', this.options.rootClass + ' dd-state-stop');

      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();

      // focus into node if not moved
      if (!hasMoved) {
        this.focusItem(el.data('id'));
      }
    },

    dragMove: function (e) {
      // add state class to the root
      this.el.attr('class', this.options.rootClass + ' dd-state-move');

      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];
        }
      }
    },

    focusItem: function (id) {
      var target = this.el.find('li[data-id=' + id + ']');
      var targetTitle = target.find('> .dd-content').text();
      var rootId = this.el.attr('id');
      if (this.el.data('shadow')) {
        rootId = this.el.data('shadow');
      }
      var barEl = $('#' + rootId + '-focus-bar');
      var shadowEl = $('#' + rootId + '-shadow');

      shadowEl.data('id', target.data('id'));
      shadowEl.find('ol.dd-list').html('').append(target.clone());
      shadowEl.find('button').remove();
      shadowEl.nestable();
      shadowEl.show();

      $('#' + rootId).hide();

      barEl.find('span').text(targetTitle);
      var that = this;
      barEl.find('button').on('click', function() {
        that.clearFocus($('#' + rootId));
      });
    },

    clearFocus: function (list) {
      var rootId = list.attr('id');
      var target = $('#' + rootId);
      var shadow = $('#' + rootId + '-shadow');
      var barEl = $('#' + rootId + '-focus-bar');
      var originLi = target.find('li[data-id=' + shadow.data('id') + ']');
      var shadowHtml = shadow.find('ol li').html();

      originLi.html(shadowHtml);

      barEl.find('span').text('');
      shadow.find('ol').html('');
      shadow.hide();
      target.show();
    }
  };

  $.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);