【Vue2.0学习】—Todolist案例（五十九）
组件化编码流程
1、实现静态组件：抽取组件，使用组件实现静态效果
2、展示动态数据：
- 数据的类型、名称是什么
- 数据保存在哪个组件
3、交互—从绑定事件监听开始
废话不多说，直接上代码
App.vue
<template>
<div id="root">
<div class="todo-container">
<div class="todo-wrap">
<MyHeader :addtodo="addtodo" />
<List :todos="todos" :checkTodo="checkTodo" :deleteTodo="deleteTodo" />
<MyFooter
:todos="todos"
:checkAllTodo="checkAllTodo"
:clearAllTodo="clearAllTodo" />
</div>
</div>
</div>
</template>
<script>
import MyHeader from './components/MyHeader.vue'
import List from './components/List.vue'
import MyFooter from './components/MyFooter.vue'
export default {
name: 'App',
components: {
MyHeader,
List,
MyFooter
},
data() {
return {
todos: [{
id: '001',
title: '吃饭',
done: true
}, {
id: '002',
title: '睡觉',
done: false
}, {
id: '003',
title: '打豆豆',
done: true
}]
}
},
methods: {
//添加 todo
addtodo(todoObj) {
this.todos.unshift(todoObj)
},
//勾选or取消勾选
checkTodo(id) {
this.todos.forEach((todo) => {
//函数体
if (todo.id === id) {
todo.done = !todo.done;
}
})
},
//删除
deleteTodo(id) {
this.todos = this.todos.filter(todo => todo.id !== id)
},
//全选全不选
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
})
}
}
}
</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-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>
Item组件
<template>
<li>
<label>
<input type="checkbox"
:checked="todo.done"
@change="handleCheck(todo.id)" />
<!-- <input type="checkbox" v-model="todo.done" /> -->
<span>{{todo.title}}</span>
</label>
<button class="btn btn-danger" @click="handleDelete(todo.id)">删除</button>
</li>
</template>
<script>
export default {
name: 'Item',
//声明接收to对象
props: ['todo','checkTodo','deleteTodo'],
methods: {
//勾选
handleCheck(id) {
//通知APP组件将对应的组件
this.checkTodo(id)
},
//删除
handleDelete(id) {
if (confirm('确定删除吗？')) {
this.deleteTodo(id)
}
}
}
}
</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>
List组件
<template>
<ul class="todo-main">
<Item v-for="todoObj in todos"
:key="todoObj.id"
:todo="todoObj"
:checkTodo="checkTodo"
:deleteTodo="deleteTodo" />
</ul>
</template>
<script>
import Item from './Item.vue'
export default {
name: 'List',
props: ['todos', 'checkTodo', 'deleteTodo'],
components: {
Item
},
}
</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;
}
</style>
MyFooter组件
<template>
<div class="todo-footer" v-show="total">
<label>
<input type="checkbox" :checked="isAll" @change="checkAll">
</label>
<span>
<span>{{doneTotal}}</span> / {{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', 'checkAllTodo','clearAllTodo'],
computed: {
total() {
return this.todos.length
},
isAll() {
return this.doneTotal === this.total && this.total > 0
},
doneTotal() {
let i = 0
this.todos.forEach((todo) => {
if (todo.done) i++
})
return i
// const x= this.todos.reduce(()=>{
// console('@',pre,current)
// return pre+(current.done ? 1:0)
// },0)
// return this.todos.reduce((pre,todo)=>pre+(todo.done?1:0),0)
}
},
methods: {
checkAll(e) {
this.checkAllTodo(e.target.checked)
},
clearAll(){
this.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>
MyHeader组件
<template>
<div class="todo-header">
<input type="text" placeholder="请输入你的任务名称，按回车键确认" @keyup.enter="add" v-model="title"/>
</div>
</template>
<script>
import {nanoid} from 'nanoid'
export default {
name: 'MyHeader',
props:['addtodo'],
data(){
return{
title:''
}
},
methods: {
add() {
//将用户的输入包装成一个对象
//校验数据
if(!this.title.trim()) return alert('输入不能为空')
//将用户包装成一个对象
const todoObj={id:nanoid(),title:this.title,done:false}
//通知APP组件去添加一个对象
this.addtodo(todoObj);
// 清空todo
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>
Todolist案例总结
1️⃣组件化编码流程：
- 拆分静态组件：组件要按照功能点拆分，命名不要与html冲突
- 实现动态组件：考虑好组件的存放位置，数据是一个组件在用，还是一些组件在用
- 一个组件在用：放在组件自身即可
- 一些组件在用：放在他们共同的父组件上（状态提升）
- 实现交互：从绑定事件开始
2️⃣props适用于
- 父组件=>子组件通信
- 子组件=>父组件通信（要求先给子一个函数）
3️⃣使用v-model时要切记：
- v-model绑定的值不能是props传过来的值，因为props是不可以修改的
- props传过来的值若是对象类型的值，修改对象中的属性时Vue不会报错，但是不推荐这样做