vue3使用ref 获取不到子组件属性问题的解决办法
作者:duansamve
父子组件使用<script setup>语法糖,父组件通过给子组件定义ref访问子组件内部属性或事件,本文给大家介绍了解决vue3使用ref 获取不到子组件属性问题,文中通过代码示例讲解的非常详细,需要的朋友可以参考下
需求:
父子组件使用<script setup>语法糖,父组件通过给子组件定义ref访问子组件内部属性或事件。
关键点:
子组件中,setup语法糖需要用defineExpose把要读取的属性和方法单独暴露出去,否则会访问失败;如果子组件使用setup()函数,则在父组件通过ref可以直接访问其属性,不需要用defineExpose暴露数据。
子组件:src/components/BaseInfoDialog.vue
<template> <el-dialog v-model="dialogTableVisible" title="Shipping address" width="800"> <el-table :data="gridData"> <el-table-column property="date" label="Date" width="150" /> <el-table-column property="name" label="Name" width="200" /> <el-table-column property="address" label="Address" /> </el-table> </el-dialog> </template> <script lang="ts" setup> import { ref, defineExpose } from "vue"; const dialogTableVisible = ref(false); const gridData = [ { date: "2016-05-02", name: "John Smith", address: "No.1518, Jinshajiang Road, Putuo District" }, { date: "2016-05-04", name: "John Smith", address: "No.1518, Jinshajiang Road, Putuo District" }, { date: "2016-05-01", name: "John Smith", address: "No.1518, Jinshajiang Road, Putuo District" }, { date: "2016-05-03", name: "John Smith", address: "No.1518, Jinshajiang Road, Putuo District" } ]; // 把数据暴露出去供父组件调用 defineExpose({ dialogTableVisible }); </script>
父组件:src/App.vue
<script setup lang="ts"> import BaseInfoDialog from "./components/BaseInfoDialog.vue"; import { ref } from "vue"; const childComponentRef = ref(null); const logChildMessage = () => { if (childComponentRef.value) { childComponentRef.value.dialogTableVisible = true; } }; </script> <template> <div> <div> <BaseInfoDialog ref="childComponentRef" /> </div> <div> <el-button type="primary" @click="logChildMessage">open dialog</el-button> </div> </div> </template> <style scoped> </style>
package.json
{ "name": "latest-vue3-ts", "version": "0.0.0", "private": true, "type": "module", "scripts": { "dev": "vite", "build": "run-p type-check \"build-only {@}\" --", "preview": "vite preview", "build-only": "vite build", "type-check": "vue-tsc --build --force" }, "dependencies": { "element-plus": "^2.7.6", "vue": "^3.4.29" }, "devDependencies": { "@tsconfig/node20": "^20.1.4", "@types/node": "^20.14.5", "@vitejs/plugin-vue": "^5.0.5", "@vue/tsconfig": "^0.5.1", "npm-run-all2": "^6.2.0", "typescript": "~5.4.0", "unplugin-auto-import": "^0.17.6", "unplugin-vue-components": "^0.27.0", "vite": "^5.3.1", "vite-plugin-vue-setup-extend": "^0.4.0", "vue-tsc": "^2.0.21" } }
vite.config.ts
import { fileURLToPath, URL } from 'node:url' import { defineConfig } from 'vite' import vue from '@vitejs/plugin-vue' import VueSetupExtend from 'vite-plugin-vue-setup-extend' import AutoImport from 'unplugin-auto-import/vite' import Components from 'unplugin-vue-components/vite' import { ElementPlusResolver } from 'unplugin-vue-components/resolvers' // https://vitejs.dev/config/ export default defineConfig({ plugins: [ vue(), VueSetupExtend(), AutoImport({ resolvers: [ElementPlusResolver()], }), Components({ resolvers: [ElementPlusResolver()], }) ], resolve: { alias: { '@': fileURLToPath(new URL('./src', import.meta.url)) } } })
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