Vue-47、Vue技术_todoList案例编辑功能

1、main.js

//该文件是整个项目的入口文件
//引入Vue
import Vue from 'vue'
//引入APP组件，他是所有组件的父组件
import App from './App.vue'

//关闭Vue是生产提示
Vue.config.productionTip = false;
//应用插件

//创建Vue实例对象---vm
new Vue({
  render: h => h(App),
  beforeCreate() {
      Vue.prototype.$bus = this;
  }
}).$mount('#app');

2、MyItem.vue

<template>
    <li>
        <label>
            <input type="checkbox" :checked="todo.done" @change="changecheckItem(todo.id)"/>
            <span v-show="!todo.isEdit">{{todo.title}}</span>
            <input v-show="todo.isEdit" type="text" v-model="title2" @blur="handlerBlur(todo)"  ref="inputTitle">
        </label>
        <button class="btn btn-danger" @click="removeTodo(todo.id)">删除</button>
        <button class="btn btn-edit" @click="editTodo(todo)">编辑</button>
    </li>
</template>
<script>
    export default {
        name: "MyItem",
        props:['todo'],
        data(){
            return{
                title2:this.todo.title
            }
        },
        methods:{
            changecheckItem(id){
                //this.changeDone(id);
                this.$bus.$emit('changeDone',id);
            },
            removeTodo(id){
                if(confirm('是否删除')){
                    //this.deleteToto(id);
                    this.$bus.$emit('deleteToto',id);
                }
            },
            editTodo(todo){
                if (todo.hasOwnProperty('isEdit')) {
                    this.todo.isEdit = true;
                }else {
                    this.$set(todo,'isEdit',true);
                }
                this.$nextTick(function () {
                    this.$refs.inputTitle.focus();
                })
            },
            handlerBlur(todo){
                todo.isEdit = false ;
                this.$bus.$emit('updateTodo',this.todo.id,this.title2);
            }
        }
    }
</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 button{
        display: block;
    }
</style>

3、App.vue

<template>
  <div id="app">
    <div class="todo-container">
      <div class="todo-wrap">
            <my-header @addTodo="addTodo"></my-header>
            <my-list :todos="todos"></my-list>
            <my-footer :todos="todos" @changeTodoDones="changeTodoDones" @clearTodoDone="clearTodoDone"></my-footer>
      </div>
    </div>
  </div>
</template>
<script>
import  MyHeader from './components/MyHeader'
import  MyFooter from './components/MyFooter'
import  MyList from './components/MyList'

export default {
  name: 'App',
  components: {
    MyHeader,MyList,MyFooter
  },
    data(){
      return{
          todos:JSON.parse(localStorage.getItem('todos')) || []
      }
    },

    watch:{
      todos:{
          deep:true,
          handler(newvalue) {
              localStorage.setItem('todos',JSON.stringify(newvalue));
          }
      }
    },
    methods:{
      addTodo(obj){
          // console.log(obj);
          this.todos.unshift(obj);
      },
        changeDone(id){
          this.todos.forEach((p)=>{
              if(p.id === id){
                  p.done = !p.done
              }
          })
        },
        deleteToto(id){
          this.todos=
          this.todos.filter(p=>p.id !== id);
        },
        changeTodoDones(value){
          console.log(value);
          this.todos.forEach(p=>{
              p.done=value;
          });
        },
        clearTodoDone(){
         this.todos=this.todos.filter(p=>{
              return !p.done
          })
        },
        updateTodo(id,title){
            this.todos.forEach(p=>{
                if (p.id===id){
                    p.title = title;
                }
            })
        }
    },
    mounted() {
      this.$bus.$on('changeDone',this.changeDone);
      this.$bus.$on('deleteToto',this.deleteToto);
      this.$bus.$on('updateTodo',this.updateTodo);
    },
    beforeDestroy() {
      this.$bus.$off('changeDone');
      this.$bus.$off('deleteToto');
      this.$bus.$off('updateTodo');
    }
}
</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: green;
      border: 1px solid #bd362f;
      margin-right: 7px;
  }
  .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>