<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<c:set var="ctx" value="${pageContext.request.contextPath}"/>
<link rel="stylesheet" href="${ctx}/res/ifw/plugins/datatables/dataTables.bootstrap.css" rel="external nofollow" />
<style>
 [v-cloak] {
 display: none;
 }
 .flip-list-move {
 transition: transform 0.5s;
 }
 .handle {
 float: right;
 padding-top: 2px;
 padding-bottom: 8px;
 }
 .no-move {
 transition: transform 0s;
 }
 .ghost {
 opacity: 0.5;
 background: #c8ebfb;
 }
 .list-group {
 min-height: 20px;
 }
 .list-group-item {
 cursor: move;
 }
 .list-group-item i {
 cursor: pointer;
 }
</style>
<div id="vueSort" class="box box-darkness">
 <div class="box-header with-border">
 <h3 class="box-title">排序</h3>
 <div class="box-tools pull-right">
  <button type="button" class="btn btn-box-tool" data-widget="collapse"><i class="fa fa-minus"></i>
  </button>
 </div>
 </div>
 <div class="box-body" style="position: relative">
 <div class="col-md-3">
  <ul id="main-nav1" class="nav nav-tabs nav-stacked">
  <draggable class="list-group" tag="ul" v-model="listProductType":move="getdata" @update="datadragEnd">
   <transition-group type="transition" :name="'flip-list'">
   <li class="list-group-item" v-for="(element,index) in listProductType" :key="element.id">
    <a :href="'#'+forId(element.uuid)" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="nav-header collapsed" data-toggle="collapse"><i
     v-show="element.productList.length>0"
     aria-hidden="true"
     :class="{'fa fa-anchor':isActive,'glyphicon glyphicon-pushpin':!isActive}"
     @click="submenu"></i></a>
    {{element.name}}
    <i class="fa fa-align-justify handle" v-show="element.productTypes.length>0"
    @click="showLeve2(index)"></i>
    <template v-if="element.productList.length>0">
    <ur :id="forId(element.uuid)" class="nav nav-list collapse secondmenu">
     <draggable class="list-group" tag="ul":move="getdata" v-model="element.productList"
      @update="datadragEnds">
     <transition-group type="transition" :name="'flip-list'">
   <li class="list-group-item" v-for="e in element.productList" :key="e.id">
    <a> {{e.name}}</a>
   </li>
   </transition-group>
  </draggable>
  </ur>
  </template>
  </li>
  </transition-group>
  </draggable>
  </ul>
 </div>
 <div class="col-md-3" v-show="one.productTypes.length>0&&showOne">
  <span><h3 style="color: red">--->{{one.name}}</h3></span>
  <ul id="main-nav2" class="nav nav-tabs nav-stacked">
  <draggable class="list-group" tag="ul" v-model="one.productTypes" :move="getdata"@update="datadragEnd">
   <transition-group type="transition" :name="'flip-list'">
   <li class="list-group-item" v-for="(element,index) in one.productTypes" :key="element.id">
    <a :href="'#'+forId(element.uuid)" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="nav-header collapsed" data-toggle="collapse"><i
     v-show="element.productList.length>0"
     aria-hidden="true"
     :class="{'fa fa-anchor':isActive,'glyphicon glyphicon-pushpin':!isActive}"
     @click="submenu"></i></a>
    {{element.name}}
    <i class="fa fa-align-justify handle" v-show="element.productTypes.length>0"
    @click="showLeve3(index)"></i>
    <template v-if="element.productList.length>0">
    <ur :id="forId(element.uuid)" class="nav nav-list collapse secondmenu">
     <draggable class="list-group" tag="ul":move="getdata" v-model="element.productList"
      @update="datadragEnds">
     <transition-group type="transition" :name="'flip-list'">
   <li class="list-group-item" v-for="e in element.productList" :key="e.id">
    <a> {{e.name}}</a>
   </li>
   </transition-group>
  </draggable>
  </ur>
  </template>
  </li>
  </transition-group>
  </draggable>
  </ul>
 </div>
 <div class="col-md-3" v-show="two.productTypes.length>0&&showTwo">
  <span><h3 style="color: red">--->{{two.name}}</h3></span>
  <ul id="main-nav3" class="nav nav-tabs nav-stacked">
  <draggable class="list-group" tag="ul" v-model="two.productTypes":move="getdata" @update="datadragEnd">
   <transition-group type="transition" :name="'flip-list'">
   <li class="list-group-item" v-for="(element,index) in two.productTypes" :key="element.id">
    <a :href="'#'+forId(element.uuid)" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="nav-header collapsed" data-toggle="collapse"><i
     v-show="element.productList.length>0"
     aria-hidden="true"
     :class="{'fa fa-anchor':isActive,'glyphicon glyphicon-pushpin':!isActive}"
     @click="submenu"></i></a>
    {{element.name}}
    <template v-if="element.productList.length>0">
    <ur :id="forId(element.uuid)" class="nav nav-list collapse secondmenu">
     <draggable class="list-group":move="getdata" tag="ul" v-model="element.productList"
      @update="datadragEnds">
     <transition-group type="transition" :name="'flip-list'">
   <li class="list-group-item" v-for="e in element.productList" :key="e.id">
    <a> {{e.name}}</a>
   </li>
   </transition-group>
  </draggable>
  </ur>
  </template>
  </li>
  </transition-group>
  </draggable>
  </ul>
 </div>
 </div>
 <div class="box-footer">
 <button type="button" class="btn btn-darkness pull-right" id="doSearch"
  style="margin-left: 20px;"@click="save">保存
 </button>
 <button type="button" class="btn btn-default pull-right" @click="reset" id="resetSearch">重置</button>
 </div>
</div>
<script type="text/javascript" src="/UploadFiles/2021-04-02/vue.js">

接下来是js。







Vue.component('vue-draggable', vuedraggable)
var vm = new Vue({
 el: '#vueSort',
 data: {
 isActive: true,
 queryObject: {},
 listProductType: [],
 showSon: false,
 index: 0,
 one: {productTypes: []},
 two: {productTypes: []},
 showOne: false,
 showTwo: false
 },
 methods: {
 init: function () {
  var _this = this;
  $.ajax({
  url: '../../mt/combinationSort/sortingData',
  data: null,
  type: 'POST',
  contentType: "application/json",
  dataType: 'json',
  success: function (data) {
   if (data.success = true) {
   if (data.dataObject.length == 0) {
    Util.alert('通知', '异常数据', 'info');
    return;
   }
   _this.listProductType = data.dataObject;
   }
   console.log(data)
  }
  })
 },
 reset: function () {
  var _this = this;
  _this.listProductType = _this.listProductType.sort((one, two) => {
  return one.displaySeq - two.displaySeq;
 })
  ;
  for (var i in _this.listProductType) {
  //排序产品类型
  _this.listProductType[i].productTypes = _this.listProductType[i].productTypes.sort((one, two) => {
   return one.displaySeq - two.displaySeq;
  })
  ;
  //排序产品
  _this.listProductType[i].productList = _this.listProductType[i].productList.sort((one, two) => {
   return one.displaySeq - two.displaySeq;
  })
  ;
  for (var a in _this.listProductType[i].productTypes) {
   _this.listProductType[i].productTypes[a].productTypes = _this.listProductType[i].productTypes[a].productTypes.sort((one, two) => {
   return one.displaySeq - two.displaySeq;
  })
   ;
   _this.listProductType[i].productTypes[a].productList = _this.listProductType[i].productTypes[a].productList.sort((one, two) => {
   return one.displaySeq - two.displaySeq;
  })
   ;
   for (var c in _this.listProductType[i].productTypes[a].productTypes) {
   _this.listProductType[i].productTypes[a].productTypes[c].productList = _this.listProductType[i].productTypes[a].productTypes[c].productList.sort((one, two) => {
    return one.displaySeq - two.displaySeq;
   })
   ;
   }
  }
  }
 },
 datadragEnd: function (evt) {
  console.log('拖动前的索引：' + evt.oldIndex);
  console.log('拖动后的索引：' + evt.newIndex);
  var obj = evt.item;
  obj.style.backgroundColor = '#fff';
 },
 submenu: function () {
  var _this = this;
  if (_this.isActive) _this.isActive = false;
  else _this.isActive = true;
  if (_this.showSon) _this.showSon = false;
  else _this.showSon = true;
 },
 datadragEnds: function (evt) {
  console.log('拖动前的索引：' + evt.oldIndex);
  console.log('拖动后的索引：' + evt.newIndex);
  var obj = evt.item;
  obj.style.backgroundColor = '#fff';
 },
 forId: function (index) {
  return "uuid_" + index
 },
 
 showLeve2: function (index) {
  var _this = this;
  _this.index = index;
  // if (_this.one.productTypes.length > 0) _this.one.productTypes = [];
  // else
  _this.one = _this.listProductType[index];
  console.log(_this.one)
  if (_this.showOne) {
  _this.showOne = false;
  _this.showTwo = false;
  }
  else _this.showOne = true;
 },
 showLeve3: function (index) {
  var _this = this;
  // if (_this.two.productTypes.length > 0) _this.two.productTypes = [];
  // else
  _this.two = _this.listProductType[_this.index].productTypes[index];
  console.log(_this.two.productTypes)
  if (_this.showTwo) _this.showTwo = false;
  else _this.showTwo = true;
 },
 getdata: function (event) {
  console.log("下来了");
  var obj = event.dragged;
  obj.style.backgroundColor = '#11cc17';
 },
 save: function () {
  var _this = this;
  Util.confirm('提示', '您确定要保存排序吗？', function (isOk) {
  if (isOk) {
   console.log(_this.listProductType);
   $.ajax({
   type: "post",
   url: "../../mt/combinationSort/saveSortingData",
   data: {list: JSON.stringify(_this.listProductType)},
   success: function (json) {
    console.log(json);
   }
   });
   Util.alert("提示", '保存成功', 'info');
  }
  }, 'info');
 
 }
 },
 created: function () {
 var _this = this;
 _this.init();
 // _this.heartbeat();
 }
});


最重要的是这几行代码

然后是使用vue把vuedraggable模块引入，上面图最下面的js是我刚刚发过的代码文件。
Vue.component('vue-draggable', vuedraggable)
这句话显得尤为重要。注册成vue的组件，虽然它本身就是vue的一个组件了。



当然最后我们会进行排序后的顺序的保存。这里就不得不说vue的双向绑定了，你对象只要在页面改变位置，在内存地址里的位置顺序也会被改变的，所有我们只需要再次将整个对象回传就行。后台去解析保存，当然这种方式我觉得会很繁琐。比如：我贴个获取数据的代码




/**
 * 获取排序数据
 * * @param merchantId
 * @return
 */
 public List<SortProductTypeVo> treeSorting(Long merchantId) {
 //获取所有的连接项
 List<ProductTypeRef> typeRefList = productTypeRefService.findAll();
 //获取所有的产品
 Map<Long, ProductVo> productList = productService.sortFindProduct(merchantId).stream().collect(
  Collectors.toMap(w -> w.getId(), w -> w));
 //最上级父级
 List<SortProductTypeVo> parentList = byParentProduct(merchantId, 0);
 //平均未分类
 List<SortProductTypeVo> typeList = byParentProduct(merchantId, 1);
 //
 //获取产品类型和产品关联
 Map<Long, List<ProductTypeRef parentIdChildrenMap = typeRefList.stream().filter(productTypeRef -> productTypeRef.getProductTypeId() != null).collect(Collectors.groupingBy(ProductTypeRef::getProductTypeId));
 parentList.forEach(p -> {
  //筛选第二级菜单
  List<SortProductTypeVo> districtsOne = typeList.stream().filter(sortProductTypeVo -> sortProductTypeVo.getParentTypeId().equals(p.getId())).collect(Collectors.toList());
  districtsOne.forEach(a -> {
  //第三层菜单
  List<SortProductTypeVo> districtsTwo = typeList.stream().filter(productType -> productType.getParentTypeId().equals(a.getId())).collect(Collectors.toList());
  districtsTwo.stream().forEach(d -> {
   //获取产品和产品类型之间的连接关系
   List<ProductTypeRef> l = parentIdChildrenMap.getOrDefault(d.getId(), new ArrayList<>());
   //排序产品关联就相当于产品排序
   l.sort((q, b) -> Integer.compare(q.getDisplaySeq(), b.getDisplaySeq()));
   //根据排序产品关联去找到产品
   d.setProductList(l.stream().map(e -> {
   ProductVo products = productList.get(e.getProductId());
   if (null != products) products.setDisplaySeq(e.getDisplaySeq());
   return products;
   }).collect(Collectors.toList()).stream().filter(s -> s != null).collect(Collectors.toList()));//数组中过滤空的产品
//   d.setProductTypeRefs(parentIdChildrenMap.getOrDefault(d.getId(), new ArrayList<>()));
  });
  List<ProductTypeRef> l = parentIdChildrenMap.getOrDefault(a.getId(), new ArrayList<>());
  l.sort((q, b) -> Integer.compare(q.getDisplaySeq(), b.getDisplaySeq()));
  a.setProductList(l.stream().map(c -> {
   ProductVo products = productList.get(c.getProductId());
   if (null != products) products.setDisplaySeq(c.getDisplaySeq());
   return products;
  }).collect(Collectors.toList()).stream().filter(s -> s != null).collect(Collectors.toList()));
  districtsTwo.sort((q, b) -> Integer.compare(q.getDisplaySeq(), b.getDisplaySeq()));
  a.setProductTypes(districtsTwo);
//  a.setProductTypeRefs(parentIdChildrenMap.getOrDefault(a.getId(), new ArrayList<>()));
  });
  List<ProductTypeRef> l = parentIdChildrenMap.getOrDefault(p.getId(), new ArrayList<>());
  l.sort((q, b) -> Integer.compare(q.getDisplaySeq(), b.getDisplaySeq()));
  p.setProductList(l.stream().map(a -> {
  ProductVo products = productList.get(a.getProductId());
  if (null != products) products.setDisplaySeq(a.getDisplaySeq());
  return products;
  }).collect(Collectors.toList()).stream().filter(s -> s != null).collect(Collectors.toList()));
//  p.setProductTypeRefs(parentIdChildrenMap.getOrDefault(p.getId(), new ArrayList<>()));
  districtsOne.sort((q, b) -> Integer.compare(q.getDisplaySeq(), b.getDisplaySeq()));
  p.setProductTypes(districtsOne);
 });
 parentList.sort((q, b) -> Integer.compare(q.getDisplaySeq(), b.getDisplaySeq()));
 return parentList;
 }


jdk8语法，可能还有需要改进的地方。反正目前来说，功能是实现了。
其实本来想代码一点点讲解的，奈何实在是有事。


关于怎么让3级菜单组件相互拖动，你只需要在父级相互拖动这里就能找到答案，

加上这个属性就行，理论上。我没试过，因为我懒，hhhh
总结
以上所述是小编给大家介绍的基于vue-draggable 实现三级拖动排序效果，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！

如果你觉得本文对你有帮助，欢迎转载，烦请注明出处，谢谢！