How to use Layui to implement draggable tree menu function

How to use Layui to implement a draggable tree menu function

Overview:
Layui is a simple and easy-to-use front-end framework that provides a wealth of Components and plug-ins allow developers to quickly build pages. This article will introduce how to use Layui to implement a draggable tree menu function. We will use the tree component provided by Layui and expand it with a drag-and-drop plug-in to implement the drag-and-drop sorting function of the tree menu.

1. Introducing related resources
   First of all, we need to introduce Layui related resource files, including Layui framework files and related style files.

<link rel="stylesheet" href="layui/css/layui.css">
<script src="layui/layui.js"></script>

2. Building a tree menu
   In HTML, we can build a tree menu through Layui's tree component. The specific menu structure can be designed according to actual needs.

<div id="tree"></div>

<script>
layui.use('tree', function(){
  var tree = layui.tree;
  
  var data = [
    {
      title: '节点1',
      id: 1,
      children: [
        {
          title: '子节点1',
          id: 11
        },
        {
          title: '子节点2',
          id: 12
        }
      ]
    },
    {
      title: '节点2',
      id: 2,
      children: [
        {
          title: '子节点3',
          id: 21
        },
        {
          title: '子节点4',
          id: 22
        }
      ]
    }
  ];
  
  tree.render({
    elem: '#tree',
    data: data,
    click: function(obj){
      // 点击节点触发的回调函数
    }
  });
});
</script>

3. Add drag and drop function
   To implement the drag and drop function, you need to introduce the drag and drop plug-in and set the drag callback function in the tree menu.

<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script src="https://cdn.bootcdn.net/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script>

<script>
layui.use(['tree', 'layer'], function(){
  var tree = layui.tree;
  var layer = layui.layer;
  
  var data = [
    // 树形菜单数据...
  ];
  
  tree.render({
    elem: '#tree',
    drag: true, // 开启拖拽功能
    data: data,
    click: function(obj){
      // 点击节点触发的回调函数
    },
    dragend: function(obj){
      // 拖拽完成后触发的回调函数
      // obj.item为拖拽的节点数据
      // obj.target为拖拽的目标节点数据
      var item = obj.item;
      var target = obj.target;
      
      // 获取拖拽节点的id和目标节点的id
      var itemId = item.id;
      var targetId = target.id;
      
      // 将拖拽节点移动到目标节点下
      // 请根据实际需求，自行编写移动节点的逻辑
      // ...
      
      layer.msg('节点 "' + item.title + '" 已成功移动到 "' + target.title + '" 之下');
    }
  });
});
</script>

4. Improve the logic of mobile nodes
   According to actual needs, we need to improve the logic of mobile nodes. The specific implementation method can be designed according to the needs of the project. The following only provides a simple example:

dragend: function(obj){
  var item = obj.item;
  var target = obj.target;
  
  // 获取拖拽节点的id和目标节点的id
  var itemId = item.id;
  var targetId = target.id;
  
  $.ajax({
    url: 'moveNode',
    type: 'POST',
    data: {
      itemId: itemId,
      targetId: targetId
    },
    success: function(data){
      // 根据服务器返回的数据，
      // 更新树形菜单的结构或重新渲染树形菜单
      // ...
    },
    error: function(){
      layer.msg('移动节点失败');
    }
  });
}

5. Summary
   By using Layui’s tree component and drag-and-drop plug-in, we can It is very convenient to implement the draggable tree menu function. In actual projects, it can be expanded and customized according to needs to further enhance user experience. I hope this article is helpful to you and I wish you happy programming!

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