# 28. 过渡与动画
Vue封装的过度与动画：在插入、更新或移除DOM元素时，在合适的时候给元素添加样式类名
准备好样式
- 元素进入的样式
v-enter进入的起点v-enter-active进入的过程中v-enter-to进入的终点
- 元素离开的样式
v-leave离开的起点v-leave-active离开过程中v-leave-to离开的终点
- 元素进入的样式
使用
<transition>包裹要过度的元素，并配置name属性，此时需要将上面样式名的v换为name．要让页面一开始就显示动画，需要添加
appear
<template>
<div>
<button @click="isShow = !isShow">显示/隐藏</button>
<transition appear name="hello">
<h1 v-show="isShow">你好啊 ！</h1>
</transition>
</div>
</template>
<script>
export default {
name: 'Test',
data() {
return {
isShow: true
}
},
mounted() {},
methods: {}
}
</script>
<style lang="less" scoped>
h1 {
background-color: orange;
}
.hello-enter-active {
animation: show 1s;
}
.hello-leave-active {
animation: show 1s reverse;
}
@keyframes show {
from {
transform: translateX(-100%);
}
to {
transform: translateX(0px);
}
}
</style>
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- 备注：若有多个元素需要过度，则需要使用
<transition-group>，每个元素都要指定key值
<transition-group name="hello" appear>
<h1 v-show="!isShow" key="1">你好啊！</h1>
<h1 v-show="isShow" key="2">尚硅谷！</h1>
</transition-group>
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- 引入第三方动画库
Animate.css（ 记得先npm i Animate.css）
<transition-group appear
name="animate__animated animate__bounce"
enter-active-class="animate__swing"
leave-active-class="animate__backOutUp">
<h1 v-show="!isShow" key="1">你好啊！</h1>
<h1 v-show="isShow" key="2">尚硅谷！</h1>
</transition-group>
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# 效果
# App.vue
<template>
<div>
<Test></Test>
<Test2></Test2>
<Test3></Test3>
</div>
</template>
<script>
import Test from './components/Test'
import Test2 from './components/Test2'
import Test3 from './components/Test3'
export default {
name: 'App',
data() {
return {}
},
components: {
Test,
Test2,
Test3,
},
mounted() {},
methods: {}
}
</script>
<style lang="scss" scoped>
</style>
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# Test.vue (css 动画)
<template>
<div>
<button @click="isShow = !isShow">显示/隐藏</button>
<transition appear name="hello">
<h1 v-show="isShow">你好啊 ！</h1>
</transition>
</div>
</template>
<script>
export default {
name: 'Test',
data() {
return {
isShow: true
}
},
mounted() {},
methods: {}
}
</script>
<style lang="less" scoped>
h1 {
background-color: orange;
}
.hello-enter-active {
animation: show 1s;
}
.hello-leave-active {
animation: show 1s reverse;
}
@keyframes show {
from {
transform: translateX(-100%);
}
to {
transform: translateX(0px);
}
}
</style>
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# Test2.vue （group）
<template>
<div>
<button @click="isShow = !isShow">显示/隐藏</button>
<!-- <transition appear name="hello">
<h1 v-show="isShow">你好啊 ！</h1>
</transition> -->
<transition-group appear name="hello">
<h1 v-show="isShow" key="1">你好啊 ！</h1>
<h1 v-show="!isShow" key="2">菠萝咕噜肉</h1>
</transition-group>
</div>
</template>
<script>
export default {
name: 'Test',
data() {
return {
isShow: true
}
},
mounted() {},
methods: {}
}
</script>
<style lang="less" scoped>
h1 {
background-color: orange;
}
// 进入的起点 // 离开的终点
.hello-enter,
.hello-leave-to {
transform: translateX(-100%);
}
// 进入的终点 .hello-leave
.hello-enter-to,
.hello-leave {
transform: translateX(0);
}
.hello-enter-active,
.hello-leave-active {
transition: 0.5s linear;
}
</style>
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# Test3.vue （过渡）
<template>
<div>
<button @click="isShow = !isShow">显示/隐藏</button>
<transition-group appear name="animate__animated animate__bounce" enter-active-class="animate__swing" leave-active-class="animate__backOutUp">
<!-- <h1 v-show="!isShow" key="1">你好啊！</h1> -->
<h1 v-show="isShow" key="2">菠萝咕噜肉</h1>
</transition-group>
</div>
</template>
<script>
import 'animate.css'
export default {
name: 'Test',
data() {
return {
isShow: true
}
},
mounted() {},
methods: {}
}
</script>
<style lang="less" scoped>
h1 {
background-color: orange;
}
// 进入的起点 // 离开的终点
.hello-enter,
.hello-leave-to {
transform: translateX(-100%);
}
// 进入的终点 .hello-leave
.hello-enter-to,
.hello-leave {
transform: translateX(0);
}
.hello-enter-active,
.hello-leave-active {
transition: 0.5s linear;
}
</style>
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# 优化Todo-List
# MyFooter.vue
<template>
<div class="todo-footer" v-show="total">
<label>
<!-- <input type="checkbox" :checked="isAll" @change="checkAll"/> -->
<input type="checkbox" v-model="isAll"/>
</label>
<span>
<span>已完成{{doneTotal}}</span> / 全部{{total}}
</span>
<button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
</div>
</template>
<script>
export default {
name:'MyFooter',
props:['todos'],
computed: {
//总数
total(){
return this.todos.length
},
//已完成数
doneTotal(){
//此处使用reduce方法做条件统计
/* const x = this.todos.reduce((pre,current)=>{
console.log('@',pre,current)
return pre + (current.done ? 1 : 0)
},0) */
//简写
return this.todos.reduce((pre,todo)=> pre + (todo.done ? 1 : 0) ,0)
},
//控制全选框
isAll:{
//全选框是否勾选
get(){
return this.doneTotal === this.total && this.total > 0
},
//isAll被修改时set被调用
set(value){
// this.checkAllTodo(value)
this.$emit('checkAllTodo',value)
}
}
},
methods: {
/* checkAll(e){
this.checkAllTodo(e.target.checked)
} */
//清空所有已完成
clearAll(){
// this.clearAllTodo()
this.$emit('clearAllTodo')
}
},
}
</script>
<style scoped>
/*footer*/
.todo-footer {
height: 40px;
line-height: 40px;
padding-left: 6px;
margin-top: 5px;
}
.todo-footer label {
display: inline-block;
margin-right: 20px;
cursor: pointer;
}
.todo-footer label input {
position: relative;
top: -1px;
vertical-align: middle;
margin-right: 5px;
}
.todo-footer button {
float: right;
margin-top: 5px;
}
</style>
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# MyHeader.vue
<template>
<div class="todo-header">
<input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title" @keyup.enter="add"/>
</div>
</template>
<script>
import {nanoid} from 'nanoid'
export default {
name:'MyHeader',
data() {
return {
//收集用户输入的title
title:''
}
},
methods: {
add(){
//校验数据
if(!this.title.trim()) return alert('输入不能为空')
//将用户的输入包装成一个todo对象
const todoObj = {id:nanoid(),title:this.title,done:false}
//通知App组件去添加一个todo对象
this.$emit('addTodo',todoObj,1,2,3)
//清空输入
this.title = ''
}
},
}
</script>
<style scoped>
/*header*/
.todo-header input {
width: 560px;
height: 28px;
font-size: 14px;
border: 1px solid #ccc;
border-radius: 4px;
padding: 4px 7px;
}
.todo-header input:focus {
outline: none;
border-color: rgba(82, 168, 236, 0.8);
box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
}
</style>
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# MyItem.vue
<template>
<li>
<label>
<input type="checkbox" :checked="todo.done" @change="handleCheck(todo.id)"/>
<!-- 如下代码也能实现功能，但是不太推荐，因为有点违反原则，因为修改了props -->
<!-- <input type="checkbox" v-model="todo.done"/> -->
<span v-show="!todo.isEdit">{{todo.title}}</span>
<input
type="text"
v-show="todo.isEdit"
:value="todo.title"
@blur="handleBlur(todo,$event)"
ref="inputTitle"
>
</label>
<button class="btn btn-danger" @click="handleDelete(todo.id)">删除</button>
<button v-show="!todo.isEdit" class="btn btn-edit" @click="handleEdit(todo)">编辑</button>
</li>
</template>
<script>
import pubsub from 'pubsub-js'
export default {
name:'MyItem',
//声明接收todo
props:['todo'],
methods: {
//勾选or取消勾选
handleCheck(id){
//通知App组件将对应的todo对象的done值取反
// this.checkTodo(id)
this.$bus.$emit('checkTodo',id)
},
//删除
handleDelete(id){
if(confirm('确定删除吗？')){
//通知App组件将对应的todo对象删除
// this.deleteTodo(id)
// this.$bus.$emit('deleteTodo',id)
pubsub.publish('deleteTodo',id)
}
},
//编辑
handleEdit(todo){
if(todo.hasOwnProperty('isEdit')){
todo.isEdit = true
}else{
// console.log('@')
this.$set(todo,'isEdit',true)
}
this.$nextTick(function(){
this.$refs.inputTitle.focus()
})
},
//失去焦点回调（真正执行修改逻辑）
handleBlur(todo,e){
todo.isEdit = false
if(!e.target.value.trim()) return alert('输入不能为空！')
this.$bus.$emit('updateTodo',todo.id,e.target.value)
}
},
}
</script>
<style scoped>
/*item*/
li {
list-style: none;
height: 36px;
line-height: 36px;
padding: 0 5px;
border-bottom: 1px solid #ddd;
}
li label {
float: left;
cursor: pointer;
}
li label li input {
vertical-align: middle;
margin-right: 6px;
position: relative;
top: -1px;
}
li button {
float: right;
display: none;
margin-top: 3px;
}
li:before {
content: initial;
}
li:last-child {
border-bottom: none;
}
li:hover{
background-color: #ddd;
}
li:hover button{
display: block;
}
</style>
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# MyList.vue
<template>
<ul class="todo-main">
<transition-group name="todo" appear>
<MyItem
v-for="todoObj in todos"
:key="todoObj.id"
:todo="todoObj"
/>
</transition-group>
</ul>
</template>
<script>
import MyItem from './MyItem'
export default {
name:'MyList',
components:{MyItem},
//声明接收App传递过来的数据
props:['todos']
}
</script>
<style scoped>
/*main*/
.todo-main {
margin-left: 0px;
border: 1px solid #ddd;
border-radius: 2px;
padding: 0px;
}
.todo-empty {
height: 40px;
line-height: 40px;
border: 1px solid #ddd;
border-radius: 2px;
padding-left: 5px;
margin-top: 10px;
}
.todo-enter-active{
animation: atguigu 0.5s linear;
}
.todo-leave-active{
animation: atguigu 0.5s linear reverse;
}
@keyframes atguigu {
from{
transform: translateX(100%);
}
to{
transform: translateX(0px);
}
}
</style>
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# App.vue
<template>
<div id="root">
<div class="todo-container">
<div class="todo-wrap">
<MyHeader @addTodo="addTodo"/>
<MyList :todos="todos"/>
<MyFooter :todos="todos" @checkAllTodo="checkAllTodo" @clearAllTodo="clearAllTodo"/>
</div>
</div>
</div>
</template>
<script>
import pubsub from 'pubsub-js'
import MyHeader from './components/MyHeader'
import MyList from './components/MyList'
import MyFooter from './components/MyFooter'
export default {
name:'App',
components:{MyHeader,MyList,MyFooter},
data() {
return {
//由于todos是MyHeader组件和MyFooter组件都在使用，所以放在App中（状态提升）
todos:JSON.parse(localStorage.getItem('todos')) || []
}
},
methods: {
//添加一个todo
addTodo(todoObj){
this.todos.unshift(todoObj)
},
//勾选or取消勾选一个todo
checkTodo(id){
this.todos.forEach((todo)=>{
if(todo.id === id) todo.done = !todo.done
})
},
//更新一个todo
updateTodo(id,title){
this.todos.forEach((todo)=>{
if(todo.id === id) todo.title = title
})
},
//删除一个todo
deleteTodo(_,id){
this.todos = this.todos.filter( todo => todo.id !== id )
},
//全选or取消全选
checkAllTodo(done){
this.todos.forEach((todo)=>{
todo.done = done
})
},
//清除所有已经完成的todo
clearAllTodo(){
this.todos = this.todos.filter((todo)=>{
return !todo.done
})
}
},
watch: {
todos:{
deep:true,
handler(value){
localStorage.setItem('todos',JSON.stringify(value))
}
}
},
mounted() {
this.$bus.$on('checkTodo',this.checkTodo)
this.$bus.$on('updateTodo',this.updateTodo)
this.pubId = pubsub.subscribe('deleteTodo',this.deleteTodo)
},
beforeDestroy() {
this.$bus.$off('checkTodo')
this.$bus.$off('updateTodo')
pubsub.unsubscribe(this.pubId)
},
}
</script>
<style>
/*base*/
body {
background: #fff;
}
.btn {
display: inline-block;
padding: 4px 12px;
margin-bottom: 0;
font-size: 14px;
line-height: 20px;
text-align: center;
vertical-align: middle;
cursor: pointer;
box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
border-radius: 4px;
}
.btn-danger {
color: #fff;
background-color: #da4f49;
border: 1px solid #bd362f;
}
.btn-edit {
color: #fff;
background-color: skyblue;
border: 1px solid rgb(103, 159, 180);
margin-right: 5px;
}
.btn-danger:hover {
color: #fff;
background-color: #bd362f;
}
.btn:focus {
outline: none;
}
.todo-container {
width: 600px;
margin: 0 auto;
}
.todo-container .todo-wrap {
padding: 10px;
border: 1px solid #ddd;
border-radius: 5px;
}
</style>
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# main.js
//引入Vue
import Vue from 'vue'
//引入App
import App from './App.vue'
//关闭Vue的生产提示
Vue.config.productionTip = false
//创建vm
new Vue({
el:'#app',
render: h => h(App),
beforeCreate() {
Vue.prototype.$bus = this
},
})
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