一、问题描述

写了一个列表的拖拽排序，但遇到一个问题，就是拖拽放下后，html元素总会有一个回落的默认效果，这个会影响排序效果。

二、解决

其实，最后解决的办法，也很简单，就是在dragover事件处理中，去除默认，也就是e.preventDefault();

 const onDragOver = (e: any, index: number) => {
    e.preventDefault();
    // ....
 }

三、最后，记录一下完整的代码实现

<template>
  <div>
    <div class="card-list">
      <div 
        class="card-item"
        :class="{ 'drag-over': dragOverIndex === index, 'active': dragData.index == index }"
        v-for="(item, index) in dataList"
        :key="index"
        draggable="true"
        @dragstart.stop="onDragStart(index)"
        @dragover.stop="onDragOver($event, index)"
        @dragend.stop="onDragend"
      >
        <span>{{ item }}</span>
      </div>
    </div>
  </div>
</template>

<script lang="ts">
import { ref } from "vue";

export default {
  name: "DragSort",
  setup() {
    const dataList = ref<string[]>([
      "字母A",
      "字母B",
      "字母D",
      "p",
    ]);

    const dragData = ref<any>({});
    const onDragStart = (index: number) => {
      dragData.value = {
        index,
      }
    }
    const dragOverIndex = ref(-1);
    const onDragOver = (e: any, index: number) => {
      e.preventDefault();
      if (dragData.value.index != index) {
        dragOverIndex.value = index;
      } else {
        dragOverIndex.value = -1;
      }
    }
    const onDragend = (e: any) => {
      e.preventDefault();
      const dragIndex = dragData.value.index;
      // console.log('onDragend', dragIndex, dragOverIndex.value);
      if (dragIndex != dragOverIndex.value && dragOverIndex.value != -1) {
        const dragItem = dataList.value[dragIndex];
        // console.log('dragItem', dragItem);
        if (dragOverIndex.value > dragIndex) {
          dataList.value.splice(dragOverIndex.value + 1, 0, dragItem);
          dataList.value.splice(dragIndex, 1);
        } else {
          dataList.value.splice(dragIndex, 1);
          dataList.value.splice(dragOverIndex.value, 0, dragItem);
        }
      }
      dragOverIndex.value = -1;
      dragData.value = {};
    }

    return {
      dataList,
      onDragStart,
      onDragOver,
      dragOverIndex,
      onDragend,
      dragData,
    };
  },
};

</script>

<style lang="less" scoped>
.card-list {
  margin-top: 10px;

  .card-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid transparent;
    position: relative;

    &.active {
      background-color: #f2f2f2;
    }

    &.drag-over {
      background-color: #ddd;
      border: 1px solid #aaa;
    }

    span {
      cursor: pointer;
    }
  }
}
</style>
</style>

四、最后

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