Vue3 setup中使用$refs的方法详解
作者：瑾修
在 Vue 3 中的 Composition API 中,$refs 并不直接可用于 setup 函数,但是实际工作中确实有需求,那么该如何解决呢,本文为大家整理了两个方案,希望对大家有所帮助
在 Vue 3 中的 Composition API 中， $refs 并不直接可用于 setup 函数。这是因为 $refs 是 Vue 2 的实例属性，而在 Vue 3 中， setup 函数是与模板实例分离的，不再使用实例属性。
实际工作中确实有需求，在 setup 函数使用$refs，下面有两种方法。
方案
方案一：getCurrentInstance
<template>
<el-table ref="multipleTableRef" :data="tableData" style="width: 100%" @selection-change="handleSelectionChange">
<el-table-column type="selection" width="55" />
<el-table-column label="Date" width="120">
<template #default="scope">{{ scope.row.date }}</template>
</el-table-column>
<el-table-column property="name" label="Name" width="120" />
<el-table-column property="address" label="Address" show-overflow-tooltip />
</el-table>
<div style="margin-top: 20px">
<el-button @click="toggleSelection([tableData[1], tableData[2]])">Toggle selection status of second and third
rows</el-button>
<el-button @click="toggleSelection()">Clear selection</el-button>
</div>
</template>
<script setup>
import { ref, getCurrentInstance } from 'vue'
const tableData = [
{
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',
},
{
date: '2016-05-08',
name: 'Tom',
address: 'No. 189, Grove St, Los Angeles',
},
{
date: '2016-05-06',
name: 'Tom',
address: 'No. 189, Grove St, Los Angeles',
},
{
date: '2016-05-07',
name: 'Tom',
address: 'No. 189, Grove St, Los Angeles',
},
]
const multipleSelection = ref([])
const handleSelectionChange = (val) => {
multipleSelection.value = val
}
const {proxy} = getCurrentInstance();
const toggleSelection = (rows) => {
if (rows) {
rows.forEach((row) => {
proxy.$refs.multipleTableRef.toggleRowSelection(row, undefined)
})
} else {
proxy.$refs.multipleTableRef.clearSelection()
}
}
</script>方案二： ref
<template>
<el-table ref="multipleTableRef" :data="tableData" style="width: 100%" @selection-change="handleSelectionChange">
<el-table-column type="selection" width="55" />
<el-table-column label="Date" width="120">
<template #default="scope">{{ scope.row.date }}</template>
</el-table-column>
<el-table-column property="name" label="Name" width="120" />
<el-table-column property="address" label="Address" show-overflow-tooltip />
</el-table>
<div style="margin-top: 20px">
<el-button @click="toggleSelection([tableData[1], tableData[2]])">Toggle selection status of second and third
rows</el-button>
<el-button @click="toggleSelection()">Clear selection</el-button>
</div>
</template>
<script setup>
import { ref } from 'vue'
const tableData = [
{
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',
},
{
date: '2016-05-08',
name: 'Tom',
address: 'No. 189, Grove St, Los Angeles',
},
{
date: '2016-05-06',
name: 'Tom',
address: 'No. 189, Grove St, Los Angeles',
},
{
date: '2016-05-07',
name: 'Tom',
address: 'No. 189, Grove St, Los Angeles',
},
]
const multipleTableRef = ref()
const multipleSelection = ref([])
const handleSelectionChange = (val) => {
multipleSelection.value = val
}
const toggleSelection = (rows) => {
if (rows) {
rows.forEach((row) => {
multipleTableRef.value.toggleRowSelection(row, undefined)
})
} else {
multipleTableRef.value.clearSelection()
}
}
</script>在这个示例中，multipleTableRef 是一个通过 ref 创建的响应式变量，用于存储对 el-table 元素的引用。
结果显示
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