vue项目简单菜单排序

功能：拖拉后，数据重组，然后返回数组给后台处理

代码如下：

<template>

  <el-dialog
    title="菜单排序"
    :close-on-click-modal="false"
    :visible.sync="visible"
    width="600px">

    <div style="margin: 0 auto;height: 400px;overflow-y: auto;overflow-x: hidden;">
      <ul class="dragSort">
        <transition-group>
          <li
            draggable="true"
            @dragstart="handlerDragstart"
            @drag="handlerDrag"
            @dragend="handlerDragend"
            :id="index"
            v-for="(item, index) in dataList"
            :key="item.menuId">
            【{{index+1}}】  {{item.name}}
            <i><span>{{item.orderNum}}</span></i>
          </li>
        </transition-group>
      </ul>
    </div>

    <!--取消与确认按钮-->
    <span slot="footer" class="dialog-footer">
      <el-button style="background-color: #479dff;color: #ffffff;" type="primary" @click="handlerCancel()">重置</el-button>
      <el-button style="background-color: #479dff;color: #ffffff;" type="primary" @click="handlerSubmit()">确定</el-button>
    </span>

  </el-dialog>

</template>
<script>
  export default {
    props: {},

    name: 'dragSort',

    data () {
      return {
        //是否弹窗
        visible: false,

        //拖动前数据
        beforeDataList: [],

        //拖动后数据
        dataList: [],
      }

    },

    methods: {

      init(){
        this.visible = true;
        this.$http({
          url: this.$http.adornUrl(`/sys/menu/selectHomepageMemu`),
          method: 'get',
          params: this.$http.adornParams()
        }).then(({data}) => {
          console.log(data)
          this.beforeDataList = data.list;
          this.dataList = data.list;

        })
      },

      handlerDragstart (e) {
        const { y, target } = e
        target.style.opacity = '.5'
        target.oriY = y
        target.oriIndex = Number(target.id)
      },

      handlerDrag (e) {
        const { y, target } = e
        if (y === 0) return
        const offset = y - target.oriY
        const length = this.dataList.length
        if (Math.abs(offset) > target.offsetHeight) {
          const index = target.oriIndex
          const copyList = [...this.dataList]
          let targetIndex = index + Math.round(offset / target.offsetHeight)
          if (targetIndex > length - 1) {
            targetIndex = length - 1
          } else if (targetIndex < 0) {
            targetIndex = 0
          }
          const readyToAppend = copyList.splice(index, 1)[0]
          copyList.splice(targetIndex, 0, readyToAppend)
          target.oriIndex = targetIndex
          target.oriY = y
          this.dataList = copyList
        }
      },

      handlerDragend (e) {
        const { y, target } = e
        target.style.opacity = '1'
      },

      //取消
      handlerCancel(){
        this.dataList = this.beforeDataList;
      },

      saveSortingData(){

        let menuIdArray = [];

        if(this.dataList.length > 0){
          for(let i=0; i<this.dataList.length; i++){
            menuIdArray.push(this.dataList[i].menuId);
          }
        }

        this.$http({
　　　　　　//返回重组数组给后台接口
          url: this.$http.adornUrl(`/xxx/xxx/xxx`),
          method: 'post',
          data: this.$http.adornData(menuIdArray, false)
        }).then(({data}) => {
          if (data && data.code === 0) {
            this.$message({
              message: '操作成功',
              type: 'success',
              duration: 1500,
              onClose: () => {
                this.init();
              }
            })
          } else {
            this.$message.error(data.msg)
          }
        })
      },

      //确定
      handlerSubmit(){
        this.$confirm("该操作将按顺序重新排序?", '提示', {
          distinguishCancelAndClose: true,
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {
          this.saveSortingData();

        }).catch(() => {
          return;
        });

      }

    }
  }
</script>

<style scoped lang="scss">
  .dragSort{
    width: 400px;
    list-style: none;
    margin: 0;
    padding: 0;
    li{
      text-align: left;
      border: 1px solid #f1f1f1;
      padding: 10px;
      box-shadow: 0 2px 8px 0 rgba(0, 0, 0, .1);
      border-radius: 5px;
      margin-bottom: 10px;
      cursor: move;
      width: 100%;
      background: #fff;
      transition: all .3s;
      z-index: 1;
      i {
        font-size: 16px;
        color: #409EFF;
        float: right;
      }
    }
  }
</style>

功能效果图：