Vue实用功能之实现拖拽元素、列表拖拽排序

yarn add vuedraggable
npm i -S vuedraggable

<template>
  <div>
    <!--使用draggable组件-->
    <div class="itxst">
      <div>自定义控制拖拽和停靠</div>
      <div class="col">
        <!-- 左边容器 -->
        <!-- 
          group： :group= "name"，相同的组之间可以相互拖拽或者 { name: "...", pull: [true, false, 'clone', array , function], put: [true, false, array , function] }
          ghostClass：:ghostClass="ghostClass" 设置拖动元素的占位符类名,你的自定义样式可能需要加!important才能生效，并把forceFallback属性设置成true
          chosenClass :ghostClass="hostClass" 被选中目标的样式，你的自定义样式可能需要加!important才能生效，并把forceFallback属性设置成true
          filter :filter=".unmover" 设置了unmover样式的元素不允许拖动
          -->
        <draggable v-model="arr1" group="itxst" ghostClass="ghost" chosenClass="chosen" filter=".forbid" animation="300"
          :move="onMove">
          <transition-group>
            <div :class="item.id==1?'item forbid':'item'" v-for="item in arr1" :key="item.id">{{item.name}}</div>
          </transition-group>
        </draggable>
      </div>
      <!-- 右边容器 -->
      <div class="col">
        <draggable v-model="arr2" group="itxst" ghostClass="ghost" chosenClass="chosen" filter=".forbid" animation="300"
          :move="onMove">
          <transition-group>
            <div :class="item.id==1?'item forbid':'item'" v-for="item in arr2" :key="item.id">{{item.name}}</div>
          </transition-group>
        </draggable>
      </div>
    </div>
  </div>
</template>
<script>
  //导入draggable组件
  import draggable from 'vuedraggable'
  export default {
    //注册draggable组件
    components: {
      draggable,
    },
    data() {
      return {
        //定义要被拖拽对象的数组
        arr1: [{
            id: 1,
            name: 'www.itxst.com（不允许停靠）'
          },
          {
            id: 2,
            name: 'www.jd.com'
          },
          {
            id: 3,
            name: 'www.baidu.com'
          },
          {
            id: 5,
            name: 'www.google.com'
          },
          {
            id: 4,
            name: 'www.taobao.com（不允许拖拽）'
          }
        ],
        arr2: [{
            id: 11,
            name: '微软'
          },
          {
            id: 12,
            name: '亚马逊'
          },
          {
            id: 13,
            name: '京东'
          },
          {
            id: 15,
            name: '谷歌'
          },
          {
            id: 14,
            name: '苹果'
          }
        ]
      };
    },
    methods: {
      //move回调方法
      onMove(e, originalEvent) {
        console.log(e)
        console.log(originalEvent)
        //不允许停靠
        if (e.relatedContext.element.id == 1) return false;
        //不允许拖拽
        if (e.draggedContext.element.id == 4) return false;
        return true;
      },
    },
  };
</script>
<style scoped>
  /*定义要拖拽元素的样式*/
  .drag {
    background-color: blue !important;
    border: solid 3px red;
  }

  .chosen {
    background-color: #333 !important;
    color: #fff;
  }

  .ghost {
    background-color: red !important;
  }

  .itxst {
    margin: 10px;
    text-align: left;
  }

  .col {
    width: 40%;
    flex: 1;
    padding: 10px;
    border: solid 1px #eee;
    border-radius: 5px;
    float: left;
  }

  .col .col {
    margin-left: 10px;
  }

  .item {
    padding: 6px 12px;
    margin: 0px 10px 0px 10px;
    border: solid 1px #eee;
    background-color: #f1f1f1;
    text-align: left;
  }

  .item .item {
    border-top: none;
    margin-top: 6px;
  }

  .item:hover {
    background-color: #fdfdfd;
    cursor: move;
  }
</style>

<template>
  <div>
    <transition-group
      name="drag"
      class="list"
      tag="ul"
    >
      <li
        @dragenter="dragenter($event, index)"
        @dragover="dragover($event, index)"
        @dragstart="dragstart(index)"
        draggable
        v-for="(item, index) in list"
        :key="item.label"
        class="list-item">
        {{item.label}}
      </li>
    </transition-group>
  </div>
</template>
<script>
export default {
  data() {
    return {
      list: [
        { label: '列表1' },
        { label: '列表2' },
        { label: '列表3' },
        { label: '列表4' },
        { label: '列表5' },
        { label: '列表6' },
      ],
      dragIndex: '',
      enterIndex: '',
    };
  },
  methods: {
    shuffle() {
      this.list = this.$shuffle(this.list);
    },
    dragstart(index) {
      this.dragIndex = index;
    },
    dragenter(e, index) {
      e.preventDefault();
      // 避免源对象触发自身的dragenter事件
      if (this.dragIndex !== index) {
        const moving = this.list[this.dragIndex];
        this.list.splice(this.dragIndex, 1);
        this.list.splice(index, 0, moving);
        // 排序变化后目标对象的索引变成源对象的索引
        this.dragIndex = index;
      }
    },
    dragover(e, index) {
      e.preventDefault();
    },
  },
};
</script>
<style lang="scss" scoped>
.list {
  list-style: none;
  .drag-move {
    transition: transform .3s;
  }
  .list-item {
    cursor: move;
    width: 300px;
    background: #EA6E59;
    border-radius: 4px;
    color: #FFF;
    margin-bottom: 6px;
    height: 50px;
    line-height: 50px;
    text-align: center;
  }
}
</style>