(精华)2020年7月17日 vue 实现element-ui的select可拖拽

<template>
  <el-select ref="dragSelect" v-model="selectVal" v-bind="$attrs" class="drag-select" multiple v-on="$listeners">
    <slot />
  </el-select>
</template>

<script>
import Sortable from 'sortablejs'

export default {
  name: 'DragSelect',
  props: {
    value: {
      type: Array,
      required: true
    }
  },
  computed: {
    selectVal: {
      get() {
        return [...this.value]
      },
      set(val) {
        this.$emit('input', [...val])
      }
    }
  },
  mounted() {
    this.setSort()
  },
  methods: {
    setSort() {
      const el = this.$refs.dragSelect.$el.querySelectorAll('.el-select__tags > span')[0]
      this.sortable = Sortable.create(el, {
        ghostClass: 'sortable-ghost', 
        setData: function(dataTransfer) {
          dataTransfer.setData('Text', '')
        },
        onEnd: evt => {
          const targetRow = this.value.splice(evt.oldIndex, 1)[0]
          this.value.splice(evt.newIndex, 0, targetRow)
        }
      })
    }
  }
}
</script>

<style lang="scss" scoped>
.drag-select {
  ::v-deep {
    .sortable-ghost {
      opacity: .8;
      color: #fff !important;
      background: #42b983 !important;
    }

    .el-tag {
      cursor: pointer;
    }
  }
}
</style>

<template>
  <div class="components-container">
    <el-drag-select v-model="value" style="width:500px;" multiple placeholder="请选择">
      <el-option v-for="item in options" :key="item.value" :label="item.label" :value="item.value" />
    </el-drag-select>

    <div style="margin-top:30px;">
      <el-tag v-for="item of value" :key="item" style="margin-right:15px;">
        {{ item }}
      </el-tag>
    </div>
  </div>
</template>

<script>
import ElDragSelect from '@/components/DragSelect' // base on element-ui

export default {
  name: 'DragSelectDemo',
  components: { ElDragSelect },
  data() {
    return {
      value: ['Apple', 'Banana', 'Orange'],
      options: [{
        value: 'Apple',
        label: 'Apple'
      }, {
        value: 'Banana',
        label: 'Banana'
      }, {
        value: 'Orange',
        label: 'Orange'
      }, {
        value: 'Pear',
        label: 'Pear'
      }, {
        value: 'Strawberry',
        label: 'Strawberry'
      }]
    }
  }
}
</script>