最近產品提出一個排序需求，希望能進行拖拽排序，我一想，vue2插件這么多，sortable.js、draggable分分鐘實現了，但是還有一個需求希望能夠實現多選拖拽，這個就有點麻煩，查詢了許多資料，暫時沒有發(fā)現能夠多選的拖拽組件，如果自己寫一個，既耗費時間，實現效果上必然沒有draggable這種成熟輪子效果好，于是決定基于draggable做改進。

實現思路

我們知道draggable插件只要設置相同的group名字就能實現分組拖拽，如果我們渲染兩個同名分組，控制第二個分組的顯示與隱藏，魚目混珠，就能實現簡單的多選拖拽效果

1.通過group="task"設置兩個同名分組，同時利用draggable=".card"屬性，控制class名稱，禁止單選

  <draggable group="task" v-model="dataList" @end="draggerEnd" class=""
        :class="show ? 'order-box-show' : 'order-box'" animation="300" draggable=".card">
        <transition-group>
          <div v-for="(item, index) in dataList" :key="index" class="box" @click="handleSelect(index)"
            :class="item.select || show ? 'card' : ''">{{ item.name }}
          </div>
        </transition-group>
      </draggable>
      <div class="position" v-show="show">
        <draggable group="task" v-model="dataList2" @end="draggerEnd" class="order-box" animation="300">
          <transition-group>
            <div v-for="(item, index) in dataList2" :key="index" class="boxs">
              <div>
                {{ item.name }}
              </div>
            </div>
          </transition-group>
        </draggable>

2.通過v-show="show"控制第二個分組的隱藏與展示，同時對數據做處理，并且在拖拽結束后，要在分組一中找到分組二拖拽過來的初始元素刪掉

    const findIndex = this.dataList.findIndex((item => item.name === '選中元素展示區(qū)'))
      this.dataList.splice(findIndex, 1)

Demo全部代碼

<template>
  <div>
    <div>
      <draggable group="task" v-model="dataList" @end="draggerEnd" class=""
        :class="show ? 'order-box-show' : 'order-box'" animation="300" draggable=".card">
        <transition-group>
          <div v-for="(item, index) in dataList" :key="index" class="box" @click="handleSelect(index)"
            :class="item.select || show ? 'card' : ''">{{ item.name }}
          </div>
        </transition-group>
      </draggable>
      <div class="position" v-show="show">
        <draggable group="task" v-model="dataList2" @end="draggerEnd" class="order-box" animation="300">
          <transition-group>
            <div v-for="(item, index) in dataList2" :key="index" class="boxs">
              <div>
                {{ item.name }}
              </div>
            </div>
          </transition-group>
        </draggable>
      </div>
    </div>
    <el-button style="marginLeft:50px" @click="handleStart">確認</el-button>
  </div>
</template>

<script>
import draggable from 'vuedraggable'
export default {
  components: {
    draggable
  },
  data() {
    return {
      dataList: [
      ],
      dataList2: [{ name: '選中元素展示區(qū)' }],
      show: false,
      selectArr: [],
    }
  },
  mounted() {
    for (var i = 0; i < 60; i++) {
      this.dataList.push({ name: i, select: false })
    }
  },
  methods: {
    handleSelect(index) {
      const data = JSON.parse(JSON.stringify(this.dataList))
      data[index].select = true
      this.selectArr.push({ ...data[index] })
      this.dataList = JSON.parse(JSON.stringify(data))
    },
    handleStart(e) {
      if (!this.selectArr.length) {
        return
      }
      this.show = true
      this.selectArr.forEach((item, index) => {
        const Index = this.dataList.findIndex(it => item.name === it.name)
        this.dataList.splice(Index, 1)
      })
    },
    draggerEnd(e) {
      const newIndex = e.newIndex
      this.dataList.splice(newIndex, 0, ...this.selectArr)
      const findIndex = this.dataList.findIndex((item => item.name === '選中元素展示區(qū)'))
      this.dataList.splice(findIndex, 1)
      this.show = false
    },


  }
}
</script>

<style lang="scss" scoped>
.order-box {
  padding: 20px 50px;
  display: flex;
  flex-wrap: wrap;

  >span {
    flex: 1;
    display: flex;
    flex-wrap: wrap;
  }

  .box {
    width: 100px;
    height: 50px;
    background: rgb(7, 174, 215);
    margin-right: 10px;
    margin-bottom: 10px;
  }

  .boxs {
    width: 100px;
    height: 50px;
    background: rgb(215, 177, 7);
    margin-right: 10px;
    margin-bottom: 10px;
  }

  .card {
    background: rgb(128, 68, 0) !important;
  }
}

.order-box-show {
  padding: 20px 50px;
  display: flex;
  flex-wrap: wrap;

  >span {
    flex: 1;
    display: flex;
    flex-wrap: wrap;
  }

  .box {
    width: 100px;
    height: 50px;
    background: rgb(7, 174, 215);
    margin-right: 10px;
    margin-bottom: 10px;
  }

  .boxs {
    width: 100px;
    height: 50px;
    background: rgb(215, 177, 7);
    margin-right: 10px;
    margin-bottom: 10px;
  }
}

.position {
  border: 1px solid red;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  cursor: pointer;
}
</style>