todolist案例
总和
设计一个添加删除框，添加代办的事项，外加一个勾选框
可以一键删除所有已完成的事项
初期设计
首先设计静态功能：
分为头部 中间 尾部三部分
头部
一个添加框,输入代办的事情，进行添加，判断是否输入为空
中间体
分为list总表和小元素item表
list总表根据设计的数组遍历给对象添加元素
item表设计页面布局与样式
尾部
设计全选按钮与勾选框，并统计共有多少事项完成，设计删除全部已完成事件
头部header
<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: "HeaderCom",
props:['addTodo'],//接受传入addTodo
data(){
return{
title:''//收集用户输入的title
}
},
methods:{
add(){
//校验数据
if (!this.title.trim()) return alert("输入不能为空")
//将输入包装成todo对象
const todoObj={id:nanoid(),title:this.title,done:false}
//通知app组件添加一个todo对象
this.addTodo(todoObj)
//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>
中间体-list
<template>
<ul class="todo-main">
<ItemCom
v-for="todo in todoList"
:key="todo.id"
:todo="todo"
:checkTodo="checkTodo"
></ItemCom>
</ul>
</template>
<script>
import ItemCom from "@/components/ItemCom";
export default {
name: "ListCom",
components:{
ItemCom
},
props:['todoList','checkTodo']
}
</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>
中间体item
<template>
<transition name="todo" appear>
<li>
<label>
<input type="checkbox" :checked="todo.done" @change="handleCheck(todo.id)"/>
<span v-show="!todo.isEdit">{{todo.title}}</span>
<input type="text" :value="todo.title" v-show="todo.isEdit"
@blur="handleBlur(todo, $event)" ref="inputTitle">
</label>
<button class="btn btn-danger" @click="handleDelete(todo.id)">删除</button>
<button class="btn btn-edit" @click="handleEdit(todo)" v-show="!todo.isEdit">编辑</button>
</li>
</transition>
</template>
<script>
import pubsub from 'pubsub-js'
export default {
name: 'ItemCom',
props: ['todo','checkTodo'],
methods: {
//勾选或取消勾选
handleCheck(id) {
// 通知App组件将对应todo的done取反
// pubsub.publish('checkTodo', id)
this.checkTodo(id)
},
handleDelete(id) {
if(confirm('确定删除吗？')){
// 通知App组件删除对应的todo
pubsub.publish('deleteTodo', id)
}
},
handleEdit(todo) {
// eslint-disable-next-line no-prototype-builtins
if(todo.hasOwnProperty('isEidt')) {
todo.isEdit = true
}else {
this.$set(todo, 'isEdit', true)
}
this.$nextTick(() => {
this.$refs.inputTitle.focus()
})
},
handleBlur(todo, e) {
let id = todo.id
let title = e.target.value
todo.isEdit = false
if(!e.target.value.trim()) return alert('输入不能为空')
pubsub.publish('updateTodo', {id, title} )
}
},
}
</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;
}
.todo-enter-active{
animation: todo 0.5s linear;
}
.todo-leave-active{
animation: todo 0.5s linear reverse;
}
@keyframes todo {
from{
transform: translateX(100%);
}
to{
transform: translateX(0px);
}
}
</style>
尾部footer
<template>
<div class="todo-footer" v-show="total">
<label>
<!-- <input type="checkbox" :checked="isAll" @change="checkAll"/>-->
<input type="checkbox" :checked="isAll" @change="checkAll"/>
</label>
<span>
<span>已完成{{doneTodo}}</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: "FooterCom",
props: ['todoList','checkAllTodo','clearAllTodo'],
computed:{
total() {
return this.todoList.length
},
doneTodo() {
// return this.todoList.filter(todo => todo.done === true).length
return this.todoList.reduce((pre,todo)=>pre+(todo.done ? 1 : 0),0)
},
isAll() {
return this.doneTodo === this.total && this.total > 0
}
},
methods: {
checkAll(e){
// this.$emit('checkAllTodo', e.target.checked)
this.checkAllTodo(e.target.checked)
},
clearAll() {
if(confirm("确定清除吗？")){
// this.$emit('clearAllTodo')
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>
app总和
<template>
<div id="app">
<div class="todo-container">
<div class="todo-wrap">
<HeaderCom :addTodo="addTodo"></HeaderCom>
<ListCom :todoList="todoList" :checkTodo="checkTodo"></ListCom>
<FooterCom :todoList="todoList" :checkAllTodo="checkAllTodo" :clearAllTodo="clearAllTodo"></FooterCom>
</div>
</div>
</div>
</template>
<script>
import HeaderCom from "@/components/HeaderCom";
import ListCom from "@/components/ListCom";
import FooterCom from "@/components/FooterCom";
import pubsub from "pubsub-js";
export default {
name: "App",
components:{
HeaderCom,
ListCom,
FooterCom
},
data() {
return {
todoList: JSON.parse(localStorage.getItem('todoList')) || []
}
},
methods: {
// 添加一个todo
addTodo(todo){
this.todoList.unshift(todo)
},
// 勾选或取消勾选一个todo
checkTodo(id) {
this.todoList.forEach(todo => {
if(todo.id === id) {
todo.done = !todo.done
}
})
},
// 更新一个todo
updateTodo(_, data) {
let { id, title } = data
this.todoList.forEach(todo => {
if(todo.id === id) {
todo.title = title
}
})
},
// 删除一个todo
deleteTodo(_, id) {
this.todoList = this.todoList.filter(todo => todo.id !== id)
},
// 全选或取消全选
checkAllTodo(done) {
this.todoList.forEach(todo => {
todo.done = done
})
},
clearAllTodo() {
this.todoList = this.todoList.filter(todo => todo.done === false)
}
},
watch: {
todoList: {
handler(value) {
localStorage.setItem('todoList', JSON.stringify(value))
},
deep: true
}
},
mounted() {
this.pubId_check = pubsub.subscribe('checkTodo', this.checkTodo)
this.pubId_delete = pubsub.subscribe('deleteTodo', this.deleteTodo)
this.pubId_update = pubsub.subscribe('updateTodo', this.updateTodo)
},
beforeDestroy() {
pubsub.unsubsribe(this.pubId_check)
pubsub.unsubsribe(this.pubId_delete)
pubsub.unsubsribe(this.pubId_update)
},
}
</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: lightgreen;
border: 1px solid green;
margin-right: 5px;
}
.btn-danger:hover {
color: #fff;
background-color: #bd362f;
}
.btn-edit:hover {
color: #fff;
background-color: green;
}
.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>
总结
/*
总结：
1.组件化编码流程：
1.拆分静态组件：组件要按照功能点拆分，命名不要与HTML元素冲突
2.实现动态组件时，要考虑好数据的存放位置，数据是一个组件再用还是一些组件在用：
1.一个组件在用：放在组件自身即可
2.一些组件在用：放在共同的父组件上(状态提升)
3.实现交互：从绑定事件开始
2.props适用于：
1.父组件 ==> 子组件通信
2.子组件 ==> 父组件通信（要求父组件先给子组件一个函数）
3.使用v-model时切记：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
4.props传过来的若是对象类型的值，修改对象中的属性时vue不会报错，但不推荐这样使用
*/
over
标签：todolist,border,案例,day77,组件,todoList,todo,id,pubsub From： https://www.cnblogs.com/GUGUZIZI/p/17161912.html