vue3+element-plus表格默认排序default-sort失效问题

场景

在使用动态数据渲染的场景，el-table设置默认属性default-sort失效。

原因

el-table的default-sort属性是针对静态数据的，如果是动态数据，default-sort则无法监听到。

• 案例：静态数据

<template>
  <el-table
    :data="tableData"
    :default-sort="{ prop: 'date', order: 'descending' }"
    style="width: 100%"
  >
    <el-table-column prop="date" label="Date" sortable width="180" />
    <el-table-column prop="name" label="Name" width="180" />
    <el-table-column prop="address" label="Address" />
  </el-table>
</template>

<script lang="ts" setup>
interface User {
  date: string
  name: string
  address: string
}
const tableData: User[] = [
	  {
	    date: '2016-05-03',
	    name: 'Tom',
	    address: 'No. 189, Grove St, Los Angeles',
	  },
	  {
	    date: '2016-05-02',
	    name: 'Tom',
	    address: 'No. 189, Grove St, Los Angeles',
	  },
	  {
	    date: '2016-05-04',
	    name: 'Tom',
	    address: 'No. 189, Grove St, Los Angeles',
	  },
	  {
	    date: '2016-05-01',
	    name: 'Tom',
	    address: 'No. 189, Grove St, Los Angeles',
	  },
]
</script>

默认排序正常

• 案例：模拟动态数据(setTimeout模拟后端延时数据返回)

<template>
  <el-table
    ref="tableNode"
    :data="tableData"
    :default-sort="{ prop: 'date', order: 'descending' }"
    style="width: 100%"
  >
    <el-table-column prop="date" label="Date" sortable width="180" />
    <el-table-column prop="name" label="Name" width="180" />
    <el-table-column prop="address" label="Address" />
  </el-table>
</template>

<script lang="ts" setup>
import { ref, nextTick } from 'vue'
const tableNode = ref()
interface User {
  date: string
  name: string
  address: string
}
let tableData = ref<User[]>([])
setTimeout(function(){
  tableData.value = [
	  {
	    date: '2016-05-01',
	    name: 'Tom',
	    address: 'No. 189, Grove St, Los Angeles',
	  },
	  {
	    date: '2016-05-03',
	    name: 'Tom',
	    address: 'No. 189, Grove St, Los Angeles',
	  },
	  {
	    date: '2016-05-02',
	    name: 'Tom',
	    address: 'No. 189, Grove St, Los Angeles',
	  },
	  {
	    date: '2016-05-04',
	    name: 'Tom',
	    address: 'No. 189, Grove St, Los Angeles',
	  }
]
}, 3000)
</script>

默认排序失效

解决方法

等待数据渲染结束后(nextTick回调)，采用el-table提供的sort方法实现手动排序

<template>
  <el-table
    ref="tableNode"
    :data="tableData"
    :default-sort="{ prop: 'date', order: 'descending' }"
    style="width: 100%"
  >
    <el-table-column prop="date" label="Date" sortable width="180" />
    <el-table-column prop="name" label="Name" width="180" />
    <el-table-column prop="address" label="Address" />
  </el-table>
</template>

<script lang="ts" setup>
import { ref, nextTick } from 'vue'
const tableNode = ref()
interface User {
  date: string
  name: string
  address: string
}
let tableData = ref<User[]>([])
setTimeout(async function(){
  tableData.value = [
	  {
	    date: '2016-05-01',
	    name: 'Tom',
	    address: 'No. 189, Grove St, Los Angeles',
	  },
	  {
	    date: '2016-05-03',
	    name: 'Tom',
	    address: 'No. 189, Grove St, Los Angeles',
	  },
	  {
	    date: '2016-05-02',
	    name: 'Tom',
	    address: 'No. 189, Grove St, Los Angeles',
	  },
	  {
	    date: '2016-05-04',
	    name: 'Tom',
	    address: 'No. 189, Grove St, Los Angeles',
	  }
]
await nextTick()
tableNode.value.sort('date', 'descending')
}, 3000)
</script>

默认排序正常