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前言
最近主管提出了许多优化用户体验的要求，其中很多涉及
dom操作。本文将 Vue3 中常见的dom操作总结了一下。觉得文章不错、或对自己开发有所帮助，欢迎点赞收藏！
一、通过 ref 拿到 dom 的引用
<template> <div class="ref-container"> <div ref="sectionRef" class="ref-section"></div> </div> </template> <script lang="ts" setup> import { ref } from 'vue' const sectionRef = ref() </script> 通过对 div 元素添加 ref 属性，为了获取到这个元素，我们声明了一个与 ref 属性名称相同的变量，然后通过 [变量名].value 的形式即可获取该 div 元素。
适用场景
- 单一
dom元素或者个数较少的场景
示例代码
<template> <div class="ref-container"> <p>通过 ref 直接拿到 dom</p> <div ref="sectionRef" class="ref-section"></div> <button @click="action" class="btn">变高</button> </div> </template> <script lang="ts" setup> import { ref } from 'vue' const sectionRef = ref() let height = 100; const action= () => { height += 50; sectionRef.value.style = `height: ${height}px`; } </script> <style lang="scss" scoped> .demo1-container { width: 100%; height: 100%; .ref-section { width: 200px; height: 100px; background-color: pink; transition: all .5s ease-in-out; } .btn { width: 200px; height: 50px; background-color: gray; color: #fff; margin-top: 100px; } } </style> 二、通过父容器的 ref 遍历拿到 dom 引用
通过对父元素添加 ref 属性，并声明一个与 ref 属性名称相同的变量 list，此时通过 list.value 会获得包含子元素的 dom 对象。此时可以通过 list.value.children[index] 的形式获取子元素 dom。
<template> <div class="ref-container"> <div ref="list" class="list-section"> <div @click="higherAction(index)" class="list-item" v-for="(item, index) in state.list" :key="index"> <span>{{item}}</span> </div> </div> </div> </template> <script lang="ts" setup> import { ref, reactive } from 'vue' const list = ref() 适用场景
- 通过
v-for循环生成的固定数量元素的场景。
示例代码
<template> <div class="ref-container"> <p>通过父容器遍历拿到dom</p> <div ref="list" class="list-section"> <div @click="higherAction(index)" class="list-item" v-for="(item, index) in state.list" :key="index"> <span>{{item}}</span> </div> </div> </div> </template> <script lang="ts" setup> import { ref, reactive } from 'vue' const list = ref() const state = reactive({ list: [1, 2, 3, 4, 5, 6, 7, 8] }) const higherAction = (index: number) => { let height = listRef.value.children[index].style.height ? listRef.value.children[index].style.height : '20px'; height = Number(height.replace('px', '')); listRef.value.children[index].style = `height: ${height + 20}px`; } </script> <style lang="scss" scoped> .demo2-container { width: 100%; height: 100%; .list-section { width: 200px; .list-item { width: 200px; height: 20px; background-color: pink; color: #333; transition: all .5s ease-in-out; display: flex; justify-content: center; align-items: center; } } } </style> 三、通过子组件 emit 传递 ref
通过对子组件添加 ref 属性，并声明一个与 ref 属性名称相同的变量 childRef，此时通过 emit 将 childRef.value 作为一个 dom 引用传递出去。
<template> <div ref="childRef" @click="cellAction" class="cell-item"> <span>{{item}}</span> </div> </template> <script lang="ts" setup> import { ref } from 'vue' const props = defineProps({ item: Number }) const emit = defineEmits(['cellTap']); const childRef = ref(); const cellAction = () => { emit('cellTap', childRef.value); } </script> 适用场景
- 多个页面都可能有操作组件
dom的场景
示例代码
<template> <div ref="childRef" @click="cellAction" class="cell-item"> <span>{{item}}</span> </div> </template> <script lang="ts" setup> import { ref } from 'vue' const props = defineProps({ item: Number }) const emit = defineEmits(['cellTap']); const childRef = ref() const cellAction = () => { emit('cellTap', childRef.value); } </script> <style lang="scss" scoped> .cell-item { width: 200px; height: 20px; background-color: pink; color: #333; transition: all .5s ease-in-out; display: flex; justify-content: center; align-items: center; } </style> <template> <div class="ref-container"> <p>通过子组件emit传递ref</p> <div class="list-section"> <Cell :item="item" @cellTap="cellTapHandler" v-for="(item, index) in state.list" :key="index"> </Cell> </div> </div> </template> <script lang="ts" setup> import { reactive } from 'vue' import Cell from '@/components/Cell.vue' const state = reactive({ list: [1, 2, 3, 4, 5, 6, 7], refList: [] as Array<any> }) const cellTapHandler = (el: any) => { let height = el.style.height ? el.style.height : '20px'; height = Number(height.replace('px', '')); el.style = `height: ${height + 20}px`; } </script> <style lang="scss" scoped> .demo2-container { width: 100%; height: 100%; .list-section { width: 200px; } } </style> 四、通过 :ref 将 dom 引用放到数组中
通过 :ref 循环调用 setRefAction 方法，该方法会默认接收一个 el 参数，这个参数就是我们需要获取的 div 元素。
<template> <div class="ref-container"> <div class="list-section"> <div :ref="setRefAction" @click="higherAction(index)" class="list-item" v-for="(item, index) in state.list" :key="index"> <span>{{item}}</span> </div> </div> </div> </template> <script lang="ts" setup> import { reactive } from 'vue' const state = reactive({ list: [1, 2, 3, 4, 5, 6, 7], refList: [] as Array<any> }) const setRefAction = (el: any) => { state.refList.push(el); } </script> 此时可以通过 state.refList[index] 的形式获取子元素 dom。
适用场景
- 通过
v-for循环生成的不固定数量或者多种元素的场景。
示例代码
<template> <div class="ref-container"> <p>通过:ref将dom引用放到数组中</p> <div class="list-section"> <div :ref="setRefAction" @click="higherAction(index)" class="list-item" v-for="(item, index) in state.list" :key="index"> <span>{{item}}</span> </div> </div> </div> </template> <script lang="ts" setup> import { reactive } from 'vue' const state = reactive({ list: [1, 2, 3, 4, 5, 6, 7], refList: [] as Array<any> }) const higherAction = (index: number) => { let height = state.refList[index].style.height ? state.refList[index].style.height : '20px'; height = Number(height.replace('px', '')); state.refList[index].style = `height: ${height + 20}px`; console.log(state.refList[index]); } const setRefAction = (el: any) => { state.refList.push(el); } </script> <style lang="scss" scoped> .demo2-container { width: 100%; height: 100%; .list-section { width: 200px; .list-item { width: 200px; height: 20px; background-color: pink; color: #333; transition: all .5s ease-in-out; display: flex; justify-content: center; align-items: center; } } } </style> 总结
经过了不断探索终于完成了，事后想了一下还是自己的本事不到家，以后还是需要不断提升自己的能力 ~ ~ ~
