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Todo-List案例版本三

2023-07-13

(160条消息) Todo-List案例版本二_bubbleJessica的博客-CSDN博客

引入了自定义事件,让案例更加完善

src/App.vue

<template>
    <div id="root">
        <div class="todo-container">
            <div class="todo-wrap">
                <MyHeader @addToDo="addToDo" />
                <MyList :todos="todos" :checkTodo="checkTodo" :deleteTodo="deleteTodo" />
                <MyFooter :todos="todos" @checkAllTodo="checkAllTodo" @clearAllTodo="clearAllTodo" />
            </div>
        </div>
    </div>
</template>

<script>
import MyHeader from './components/MyHeader'
import MyList from './components/MyList'
import MyFooter from './components/MyFooter'

export default {
    name: 'App',
    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')) || []
        }
    },
    components: { MyHeader, MyList, MyFooter },
    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
            })
        },
        // 删除一个todo
        deleteTodo(id) {
            // 注意:filter不改变原数组,只是新建一个数组
            this.todos = this.todos.filter((todo) => {
                return todo.id !== id
            })
        },
        // 全选or取消全选
        checkAllTodo(done) {
            this.todos.forEach((todo) => {
                todo.done = done
            })
        },
        // 清除所有已完成的todo
        clearAllTodo() {
            this.todos = this.todos.filter((todo) => {
                return !todo.done
            })
        }
    },
    watch: {
        // todos简写不包含深度监视
        // todos(value) {
        //     localStorage.setItem('todos', JSON.stringify(value))
        // }

        // todos完整版深度监视
        todos:{
            deep:true,
            handler(value){
                localStorage.setItem('todos', JSON.stringify(value))
            }
        }
    }
}
</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>

src/components/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{
            title:''
        }
    },
    // props:['addToDo'],
    methods:{
        add(){
            if(!this.title.trim()) return alert('输入不能为空!')
            // 给用户输入的内容包装成一个todoObj对象
            const todoObj={id:nanoid(),title:this.title,done:false};
            // this.addToDo(todoObj);
            this.$emit('addToDo',todoObj)
            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>

src/components/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','checkAllTodo','clearAllTodo'],
    props: ['todos'],
    computed: {
        total() {
            return this.todos.length
        },
        doneTotal() {
            // 数组.reduce()方法
            // const x = this.todos.reduce((pre, cur) => {
            //     return pre + (cur.done ? 1 : 0)
            // }, 0)
            // return x
            return this.todos.reduce((pre, todo) => pre + (todo.done ? 1 : 0), 0)
        },
        // 计算属性简写版
        // isAll() {
        //     return this.doneTotal === this.total && this.total > 0
        // }

        // 计算属性完整版
        isAll:{
            get(){
                return this.doneTotal === this.total && this.total > 0
            },
            set(value){
                // this.checkAllTodo(value);
                this.$emit('checkAllTodo',value)
            }
        }
    },
    // methods:{
    //     checkAll(e){
    //         // console.log(e.target.checked);
    //         this.checkAllTodo(e.target.checked);
    //     }
    // }
    methods:{
        clearAll(){
            // this.clearAllTodo()
            this.$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>

总结:@addToDo="addToDo" 红色是事件名,紫色是回调名

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