How to make use of it:

1. Load jQuery and jQuery UI within the document.

<link rel="stylesheet" href="/path/to/cdn/jquery-ui.css" />
<script src="/path/to/cdn/jquery-ui.min.js"></script>
<script src="/path/to/cdn/jquery.slim.min.js"></script>

2. Create a hierarchical tree from nested HTML lists as follows:

<ul id="tree">
  <li class="tree-branch branch-level-1">
    <div class="contents">
      <div class="branch-drag-handler">
        <span class="branch-title">Branch 1</span>
      </div>
    </div>
    <div class="children-bus"></div>
  </li>
  <li class="tree-branch branch-level-2">
    <div class="contents">
      <div class="branch-drag-handler">
        <span class="branch-title">Branch 2</span>
      </div>
    </div>
    <div class="children-bus"></div>
  </li>
  <li class="tree-branch branch-level-2">
    <div class="contents">
      <div class="branch-drag-handler">
        <span class="branch-title">Branch 3</span>
      </div>
    </div>
    <div class="children-bus"></div>
  </li>
  <li class="tree-branch branch-level-3">
    <div class="contents">
      <div class="branch-drag-handler">
        <span class="branch-title">Branch 4</span>
      </div>
    </div>
    <div class="children-bus"></div>
  </li>
  <li class="tree-branch branch-level-3">
    <div class="contents">
      <div class="branch-drag-handler">
        <span class="branch-title">Branch 5</span>
      </div>
    </div>
    <div class="children-bus"></div>
  </li>
  <li class="tree-branch branch-level-2">
    <div class="contents">
      <div class="branch-drag-handler">
        <span class="branch-title">Branch 6</span>
      </div>
    </div>
    <div class="children-bus"></div>
  </li>
  <li class="tree-branch branch-level-1">
    <div class="contents">
      <div class="branch-drag-handler">
        <span class="branch-title">Branch 7</span>
      </div>
    </div>
    <div class="children-bus"></div>
  </li>
</ul>

3. Here are the instance CSS types for the sortable tree.

#tree {
  padding: 0.1em 0;
  list-style: none;
  margin: 0;
}

#tree .tree-branch {
  margin-bottom: 0;
  position: relative;
}

.tree-branch > .contents {
  clear: both;
  line-height: 1.5;
  position: relative;
  margin: 10px 0 0;
}

.contents .branch-drag-handler {
  cursor: move;
  background: #fff;
  border: 1px solid #fff;
  box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.15);
  border-radius: 3px;
  position: relative;
  padding: 10px 15px;
  height: auto;
  min-height: 20px;
  max-width: 450px;
  line-height: 2.3076923;
  overflow: hidden;
  word-wrap: break-word;
}

.branch-drag-handler .icon {
  color: #504e4e;
  margin-right: 5px;
}

#tree .sortable-placeholder {
  border: 1px dashed rgb(63, 63, 63);
  height: 35px;
  width: 450px;
  margin-top: 10px;
}

.tree-branch.ui-sortable-helper .contents {
  margin-top: 0;
}

.tree-branch.ui-sortable-helper .children-bus .contents {
  margin-top: 10px;
}

.tree-branch .children-bus:empty {
  display: none;
}

.branch-level-1 {
  margin-left: 0px;
}
.branch-level-2 {
  margin-left: 30px;
}
.branch-level-3 {
  margin-left: 60px;
}
.branch-level-4 {
  margin-left: 90px;
}
.branch-level-5 {
  margin-left: 120px;
}
.branch-level-6 {
  margin-left: 150px;
}
.branch-level-7 {
  margin-left: 180px;
}
.branch-level-8 {
  margin-left: 210px;
}
.branch-level-9 {
  margin-left: 240px;
}
.branch-level-10 {
  margin-left: 270px;
}

.branch-level-1 .children-bus {
  margin-left: 0px;
}
.branch-level-2 .children-bus {
  margin-left: -30px;
}
.branch-level-3 .children-bus {
  margin-left: -60px;
}
.branch-level-4 .children-bus {
  margin-left: -90px;
}
.branch-level-5 .children-bus {
  margin-left: -120px;
}
.branch-level-6 .children-bus {
  margin-left: -150px;
}
.branch-level-7 .children-bus {
  margin-left: -180px;
}
.branch-level-8 .children-bus {
  margin-left: -210px;
}
.branch-level-9 .children-bus {
  margin-left: -240px;
}
.branch-level-10 .children-bus {
  margin-left: -270px;
}

4. Default plugin options.

options: {
  depth: 30,
  treeSelector: '#tree',
  branchSelector: '.tree-branch',
  dragHandlerSelector: '.branch-drag-handler',
  placeholderName: 'sortable-placeholder',
  childrenBusSelector: '.children-bus',
  levelPrefix: 'branch-level-',
  maxLevel: 10,
},

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