Vue官网todoMVC示例代码(4)

日期：2020-05-11 栏目：程序人生浏览：次
<body>
 <div id="app">
  <header class="header">todos</header>
  <div class="content">
   <span class="icon-down el-icon-arrow-down" 
   v-show="todoLists.length>0" 
   @click="selectAllTodos">
   </span>
   <input type="text" class="todos_add" placeholder="What needs to be done?" 
   @keyup.enter="addTodo($event.target)" 
   ref="currentInput">
   <ul class="content_todoLists">
    <li v-for="(list,index) in todoLists" class="content_todoList" 
    @mouseover="list.isActive = true" 
    @mouseleave="list.isActive=false"
    v-show="defaultShow || (whichShow?list.isChecked:!list.isChecked)">
     <input type="checkbox" class="checkBox" v-model="list.isChecked">
     <div class="content_todoList_main" @dblclick="toEdit(list)" v-show="!list.isEditing" :class="{deleted:list.isChecked}">
      {{list.value}}
     </div>
     <input type="text" class="content_todoList_main main_input" 
     v-model="list.value" 
     v-show="list.isEditing" 
     v-todo-focus="list.value"
     @blur="unEdit(list)">
     <span class="el-icon-close content_todoList_delete" :class="{show: list.isActive}" @click="deleteTodo(index)"></span>
    </li>
   </ul>
   <div class="data" v-show="todoLists.length>0">
    <div class="data_times" v-show="times === 0">
     <span>{{times}}</span> item left
    </div>
    <div class="data_times" v-show="times > 0">
     <span>{{times}}</span> items left
    </div>
    <div class="data_status">
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" :class="{active:index === dataStatusIndex}" v-for="(item,index) in dataStatus" @click="switchStatus(index)" :key="index">
      {{item}}
     </a>
    </div>
    <div class="data_clearTodos" @click="clearTodos" v-show="times < todoLists.length">
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >clear completed</a>
    </div>
    <div class="data_clearTodos" @click="clearTodos" v-show="times === todoLists.length">
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ></a>
    </div>
   </div>
  </div>
 </div>
</body>
<script>
 let vm = new Vue({
  el: "#app",
  data() {
   return {
    todoLists: [],
    dataStatus: ["All", "Active", "Completed"],
    dataStatusIndex: 0,
    whichShow: true,
    defaultShow: true
   }
  },
  computed: {
   times() { //使用计算属性计算待办todos的次数 
    let todoArr = this.todoLists
    let times = 0
    for (let i = 0; i < todoArr.length; i++) {
     if (todoArr[i].isChecked === false) {
      times++
     }
    }
    return times
   }
  },
  methods: {
   toEdit(obj) { //使添加的todo可编辑
    obj.isEditing = true
   },
   unEdit(obj) { //使添加的todo不可编辑
    obj.isEditing = false
   },
   addTodo(e) { //添加todo
    var val = e.value
    if (val === "") {
     return
    } //如果输入内容为空则立即返回
    this.todoLists = this.todoLists.concat({ //使用concat这个api添加todo
     value: val, //输入内容
     isEditing: false, //是否在编辑状态
     isActive: false, //删除X图标是否激活
     isChecked: false //是否已完成
    })
    this.$refs.currentInput.value = "" //按下enter添加todo之后把输入框value清零
    window.localStorage.setItem("content", JSON.stringify(this.todoLists)) //使用localStorage以JSON格式存储数据
   },
   deleteTodo(index) { //删除todo
    this.todoLists.splice(index, 1)
    window.localStorage.setItem("content", JSON.stringify(this.todoLists)) //以json格式存储数据
   },
   switchStatus(index) { //试下下方三个状态切换，略麻烦
    this.dataStatusIndex = index
    if (this.dataStatus[index] === "Active") {
     this.defaultShow = false
     this.whichShow = false
    } else if (this.dataStatus[index] === "Completed") {
     this.defaultShow = false
     this.whichShow = true
    } else if (this.dataStatus[index] === "All") {
     this.defaultShow = true
    }
   },
   clearTodos() { //清空已完成的todoLists
    this.todoLists = this.todoLists.filter(todo => todo.isChecked === false)
    window.localStorage.setItem("content", JSON.stringify(this.todoLists)) //以json格式存储数据
   },
   selectAllTodos() { //设置所有todo为已完成
    this.todoLists.map(todo => todo.isChecked = todo.isChecked ? false : true)
   }
  },
  directives: { //自定义focus指令
   "todo-focus": function (el, binding) {
    if (binding.value) {
     el.focus()
    }
   }
  },
  created() {
   let myStorage = window.localStorage.getItem('content')
   this.todoLists = JSON.parse(myStorage) || [] //因为todoLists初始值是null,使用或运算符，如果为null设为空数组
  }
 })
</script>
转载注明出处：http://www.heiqu.com/207.html
Vue官网todoMVC示例代码(4)

相关推荐
