Vue Array.splice（）不会删除element-ui表中的DOM元素

Question

我有一个带有层次结构的表。当我尝试使用“ array.splice”删除其中一个子级时，VUE不会被动地删除其Dom结构。有人遇到过这个吗？有什么解决方案？

通过表c网站Vuejs的示例重现了此问题

var Main = {
    data() {
      return {
        tableData: [{
          id: 1,
          date: '2016-05-02',
          name: 'wangxiaohu'
        }, {
          id: 2,
          date: '2016-05-04',
          name: 'wangxiaohu'
        }, {
          id: 3,
          date: '2016-05-01',
          name: 'wangxiaohu',
          children: [{
              id: 31,
              date: '2016-05-01',
              name: 'wangxiaohu'
            }, {
              id: 32,
              date: '2016-05-01',
              name: 'wangxiaohu'
          }]
        }, {
          id: 4,
          date: '2016-05-03',
          name: 'wangxiaohu'
        }],
        tableData1: [{
          id: 1,
          date: '2016-05-02',
          name: 'wangxiaohu'
        }, {
          id: 2,
          date: '2016-05-04',
          name: 'wangxiaohu'
        }, {
          id: 3,
          date: '2016-05-01',
          name: 'wangxiaohu',
          hasChildren: true
        }, {
          id: 4,
          date: '2016-05-03',
          name: 'wangxiaohu'
        }]
      }
    },
    methods: {
      load(tree, treeNode, resolve) {
        resolve([
          {
            id: 31,
            date: '2016-05-01',
            name: 'wangxiaohu'
          }, {
            id: 32,
            date: '2016-05-01',
            name: 'wangxiaohu'
          }
        ])
      },
      removeRow(row){
        this.tableData[2].children.splice(0,1);
        //this.tableData.splice(0,1);
      }
    },
  }
var Ctor = Vue.extend(Main)
new Ctor().$mount('#app')

@import url("//unpkg.com/element-ui@2.7.2/lib/theme-chalk/index.css");

<script src="//unpkg.com/vue/dist/vue.js"></script>
<script src="//unpkg.com/element-ui@2.7.2/lib/index.js"></script>
<div id="app">
<template>
<div>
  <el-button @click="removeRow">
    Delete child
  </el-button>
  <el-table
    :data="tableData"
    style="width: 100%;margin-bottom: 20px;"
    border
    row-key="id">
    <el-table-column
      prop="date"
      label="日期"
      sortable
      width="180">
    </el-table-column>
    <el-table-column
      prop="name"
      label="name"
      sortable
      width="180">
    </el-table-column>
  </el-table>

  <el-table
    :data="tableData1"
    style="width: 100%"
    row-key="id"
    border
    lazy
    :load="load"
    >
    <el-table-column
      prop="date"
      label="date"
      width="180">
    </el-table-column>
    <el-table-column
      prop="name"
      label="name"
      width="180">
    </el-table-column>
  </el-table>
</div>
</template>
</div>

我正在使用Vue 2.6.10和element-ui 2.7.0

Answer 1

element-ui内部处理数据的方式似乎有问题。直接修改嵌套数据时，不会重新呈现表。 （但是数据确实正确地突变了，正如在this.tableData之后登录splice()所看到的那样。）

它有助于创建tableData的副本（如果您希望支持较旧的浏览器，则可能需要Array.from()的变通方法/填充），对其进行修改并将tableData设置为变异的副本。

（在全屏模式下打开片段，单击两次按钮，或在单击按钮之前展开子级，因为默认情况下这些子级处于折叠状态，然后重新渲染。）

var Main = {
    data() {
      return {
        tableData: [{
          id: 1,
          date: '2016-05-02',
          name: 'wangxiaohu'
        }, {
          id: 2,
          date: '2016-05-04',
          name: 'wangxiaohu'
        }, {
          id: 3,
          date: '2016-05-01',
          name: 'wangxiaohu',
          children: [{
              id: 31,
              date: '2016-05-01',
              name: 'wangxiaohu'
            }, {
              id: 32,
              date: '2016-05-01',
              name: 'wangxiaohu'
          }]
        }, {
          id: 4,
          date: '2016-05-03',
          name: 'wangxiaohu'
        }],
        tableData1: [{
          id: 1,
          date: '2016-05-02',
          name: 'wangxiaohu'
        }, {
          id: 2,
          date: '2016-05-04',
          name: 'wangxiaohu'
        }, {
          id: 3,
          date: '2016-05-01',
          name: 'wangxiaohu',
          hasChildren: true
        }, {
          id: 4,
          date: '2016-05-03',
          name: 'wangxiaohu'
        }]
      }
    },
    methods: {
      load(tree, treeNode, resolve) {
        resolve([
          {
            id: 31,
            date: '2016-05-01',
            name: 'wangxiaohu'
          }, {
            id: 32,
            date: '2016-05-01',
            name: 'wangxiaohu'
          }
        ])
      },
      removeRow(row){
        var newTableData = Array.from(this.tableData);
        newTableData[2].children.splice(0,1)
        this.tableData = newTableData;
        //this.tableData.splice(0,1);
      }
    },
  }
var Ctor = Vue.extend(Main)
new Ctor().$mount('#app')

@import url("//unpkg.com/element-ui@2.7.2/lib/theme-chalk/index.css");

<script src="//unpkg.com/vue/dist/vue.js"></script>
<script src="//unpkg.com/element-ui@2.7.2/lib/index.js"></script>
<div id="app">
<template>
<div>
  <el-button @click="removeRow">
    Delete child
  </el-button>
  <el-table
    :data="tableData"
    style="width: 100%;margin-bottom: 20px;"
    border
    row-key="id">
    <el-table-column
      prop="date"
      label="日期"
      sortable
      width="180">
    </el-table-column>
    <el-table-column
      prop="name"
      label="name"
      sortable
      width="180">
    </el-table-column>
  </el-table>

  <el-table
    :data="tableData1"
    style="width: 100%"
    row-key="id"
    border
    lazy
    :load="load"
    >
    <el-table-column
      prop="date"
      label="date"
      width="180">
    </el-table-column>
    <el-table-column
      prop="name"
      label="name"
      width="180">
    </el-table-column>
  </el-table>
</div>
</template>
</div>