Vue使用vue-draggable 插件在不同列表之间拖拽功能

今天分享一个vue项目中在不同列表拖拽设置选项的功能，这个功能也是在做项目中遇到的，先说下这个功能的要点(参考下图)，有2个列表，左侧列表展示已选，右侧列表展示未选，通过拖拽进行设置，已选的选项不能超过4个，超过的话自动将拖拽之前的最后一项清除到右侧，且如果从已选往未选里拖的时候，右侧显示垃圾桶的提示(如图)。

拖拽功能图片：

垃圾桶显示图：

首先讲讲vue-draggable的使用

安装vue-draggable:

npm install vuedraggable

在使用插件的组件内引入vue-draggable并注册组件:

import draggable from "vuedraggable"

components: {
 draggable
}

然后在我们需要拖拽的列表中使用：

<draggable class="selected-list" tag="ul" 
v-model="selectedTheme" 
v-bind="dragOptions"
 :move="onMove"
 @end="onEnd" 
 >
 <li class="selected-theme"
 v-for="item in selectedTheme"
 :key="item.type"
 >{{item.name}}</li>
</draggable>

下面是拖拽功能组件的完整代码：

<template>
 <div class="theme-setting">
 <el-dialog
 title="设置选项"
 :visible.sync="dialogVisible"
 width="648px"
 :close-on-click-modal="false"
 >
 <div class="theme-left">
  <dl class="theme-title">
  <dt class="title">当前选项</dt>
  <dd class="des">从右侧拖拽添加</dd>
  </dl>
  <draggable class="selected-list" tag="ul" 
  v-model="selectedTheme" 
  v-bind="dragOptions"
  :move="onMove"
  @end="onEnd" 
  >
  <li class="selected-theme"
  v-for="item in selectedTheme"
  :key="item.type"
  >{{item.name}}</li>
  </draggable>
 </div>
 <div class="theme-right">
  <h3 class="theme-right-title">全部选项</h3>
  <draggable class="theme-right-list" tag="ul"
  v-model="unSelectTheme"
  v-bind="dragOptions"
  :move="onMove"
  @end="onEnd">
  <li class="theme-right-item"
  v-for="item in unSelectTheme"
  :key="item.type"
  >{{item.name}}</li>
  </draggable>
 </div>
 <div class="drag-drop-del" v-show="isShowDel">
  <img src="../assets/imgs/drapDrop/drag_drop_del.png" alt="">
 </div>
 <span slot="footer" class="dialog-footer">
  <el-button @click="restoreDefault">恢复默认设置</el-button>
  <el-button type="primary" @click="saveThemeSet">保存</el-button>
 </span>
 </el-dialog>
 </div>
</template>

<script>
import {Message} from 'element-ui'
import draggable from "vuedraggable" 
 export default {
 name: 'DragDrop',
 components: {
 draggable
 },
 data() {
 return {
  dialogVisible: false,
  selectedTheme: [{
  type: 1,
  name: '选项1'
  }, {
  type: 2,
  name: '选项2'
  }, {
  type: 3,
  name: '选项3'
  }, {
  type: 4,
  name: '选项4'
  }], // 已选主题列表
  unSelectTheme: [{
  type: 5,
  name: '选项5'
  }, {
  type: 6,
  name: '选项6'
  }], // 未选主题列表
  backSelectedTheme: [], // 选主题列表备份
  backUnSelectTheme: [], // 未选主题列表备份用于恢复默认设置
  relatedListLast: {}, // 已选主题列表最后一项
  isShowDel: false
 }
 },
 methods: {
 showDrag() {
  this.dialogVisible = true
 },
 onMove({ relatedContext, draggedContext, to }) {
  const relatedElement = relatedContext.element
  const draggedElement = draggedContext.element
  let dragInEl = to['className']
  if (dragInEl == 'selected-list') {
  this.isShowDel = false
  if (this.selectedTheme.length === 4) { 
   // 判断往已选列表拖时，如果已经满足4项，则记录已选列表的最后一项
   // 拖拽结束时将此项清除到未选列表中
   this.relatedListLast = this.selectedTheme[this.selectedTheme.length-1]
  }
  } else {
  this.isShowDel = true // 判断如果是往未选列表里拖的话显示垃圾桶
  }
  return (
  (!relatedElement || !relatedElement.fixed) && !draggedElement.fixed
  )
 },
 onEnd(dragObj) {
  let dragInEl = dragObj.to['className']
  if (dragInEl == 'selected-list') {
  if (this.selectedTheme.length > 4) {
   // 判断已选列表大于4项，将记录的最后一项过滤出来，并push到未选列表数组
   this.selectedTheme = this.selectedTheme.filter(item => {
   return item.type != this.relatedListLast.type
   })
   this.unSelectTheme.push(this.relatedListLast)
  }
  }
  if (dragInEl === 'theme-right-list') {
  // 判断是往未选列表拖时，拖拽结束时将垃圾桶隐藏
  this.isShowDel = false
  }
 },
 // 保存设置
 saveThemeSet() {
  const params = {
  taskTopicList: this.selectedTheme
  }
  if (this.selectedTheme.length !== 4) {
  Message({
   type: 'error',
   message: '需设置4个选项 !'
  })
  return false
  }
  $ajax.save(params).then(data => {
  this.dialogVisible = false
  Message({
   type: 'success',
   message: '保存成功！'
  })
  this.$parent.refresh()
  }).catch(err => {
  console.log(err)
  })
 },
 // 恢复默认设置
 restoreDefault() {
  this.selectedTheme = this.backSelectedTheme
  this.unSelectTheme = this.backUnSelectTheme
 }
 },
 computed: {
 dragOptions() {
  return {
  animation: 0,
  group: "description",
  disabled: false,
  ghostClass: "ghost"
  }
 }
 }
 };
</script>
<style lang="less" scoped>
body, ul, dl, dt, dd, li, h1, h3{
 margin: 0;
 padding: 0;
}
ul, ol, li {
 list-style: none;
}
.theme-setting {
 /deep/.el-dialog {
 height: 476px;
 border-radius: 6px;
 .el-dialog__header {
  height: 55px;
  line-height: 56px;
  padding: 0;
  border-bottom: 1px solid rgba(13,20,30, 0.1);
  .el-dialog__title {
  height:21px;
  font-size:16px;
  font-family:MicrosoftYaHei-Bold,MicrosoftYaHei;
  font-weight:bold;
  color:rgba(13,20,30,1);
  line-height:21px;
  }
  .el-dialog__headerbtn {
  margin-top: -4px;
  }
 }
 .el-dialog__body {
  position: relative;
  display: flex;
  height: 331px;
  padding: 0;
  border-bottom: 1px solid rgba(13,20,30, 0.1);
  .theme-left {
  width: 218px;
  margin-left: 24px;
  border-right: 1px solid rgba(13,20,30, 0.1);
  .theme-title {
   display: flex;
   margin-top: 24px;
   .title {
   height:19px;
   margin-right: 4px;
   font-size:14px;
   font-family:MicrosoftYaHei-Bold,MicrosoftYaHei;
   font-weight:bold;
   color:rgba(13,20,30,1);
   line-height:19px;
   }
   .des {
   height:16px;
   font-size:12px;
   font-family:MicrosoftYaHei;
   color:rgba(13,20,30,0.6);
   line-height:19px;
   }
  }
  .selected-list {
   height: 240px;
   margin-top: 24px;
   overflow: hidden;
   .selected-theme {
   width:160px;
   height:48px;
   line-height:48px;
   text-align: center;
   margin-bottom: 16px;
   cursor: pointer;
   background:linear-gradient(180deg,rgba(43,46,83,1) 0%,rgba(108,116,150,1) 100%);
   border-radius:6px;
   font-size:14px;
   font-family:MicrosoftYaHei;
   color:rgba(255,255,255,1);
   }
  }
  }
  .theme-right {
  padding: 0 24px;
  .theme-right-title {
   padding-top: 24px;
   height:19px;
   font-size:14px;
   font-family:MicrosoftYaHei-Bold,MicrosoftYaHei;
   font-weight:bold;
   color:rgba(13,20,30,0.4);
   line-height:19px;
  }
  .theme-right-list {
   width: 357px;
   height: 240px;
   overflow: scroll;
   margin-top: 24px;
   .theme-right-item {
   width: 160px;
   height:48px;
   line-height:48px;
   float: left;
   margin-right: 16px;
   margin-bottom: 16px;
   background:rgba(247,248,252,1);
   border-radius:6px;
   font-size:14px;
   font-family:MicrosoftYaHei;
   color:rgba(13,20,30,0.4);
   text-align: center;
   cursor: pointer;
   }
  }
  .theme-right-list::before, .theme-right-list::after {
   content: "";
   display: table;
  }
  .theme-right-list::after {
   clear: both;
  }
  }
  .drag-drop-del {
  position: absolute;
  right: 1px;
  top: 0;
  width: 404px;
  height: 331px;
  display: flex;
  justify-content: center;
  align-items: center;
  background-image: url('../../src/assets/imgs/drapDrop/drag_drop.png');
  img {
   width: 96px;
   height: 96px;
  }
  }
 }
 .el-dialog__footer {
  height: 88px;
  padding: 24px 24px 0;
  .dialog-footer {
  .el-button+.el-button {
   margin-left: 16px;
  }
  }
 }
 }
}
</style>

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