溫馨提示×

溫馨提示×

您好，登錄后才能下訂單哦！

密碼登錄×
登錄注冊×
其他方式登錄
點擊 登錄注冊 即表示同意《億速云用戶服務條款》

Vue官網(wǎng)todoMVC示例代碼

發(fā)布時間：2020-08-23 08:46:29 來源：腳本之家 閱讀：145 作者：Jack 欄目：web開發(fā)

這個示例是模仿官網(wǎng)示例樣式和功能用我自己的方式寫的，基本上沒有看官網(wǎng)的源碼，只參考自定義指令。讓我們一步步來探討一下。官網(wǎng)demo

要實現(xiàn)的功能

  1. 單條添加todo
  2. 單條刪除todo
  3. 雙擊編輯todo
  4. 單條todo已完成相應樣式狀態(tài)改變
  5. 全部todo是已完成相應樣式狀態(tài)改變
  6. 清除全部已完成todos
  7. 待辦todos數(shù)量顯示
  8. 所有todos，已完成todos，未完成todos篩選

Vue官網(wǎng)todoMVC示例代碼

單條添加todo

<input type="text" class="todos_add" placeholder="What needs to be done?" 
@keyup.enter="addTodo($event.target)" //綁定enter事件
ref="currentInput">//操作input元素使enter一下之后清空輸入框內(nèi)容
data() {//一些初始化數(shù)據(jù)
 return {
  todolists: [],
  dataStatus: ["All", "Active", "Completed"],
  dataStatusIndex: 0,
  whichShow: true,
  defaultShow: true
 }
},
addTodo(e) { //添加todo
 var val = e.value
 if (val === "") {return} //如果輸入內(nèi)容為空則立即返回
 this.todoLists = this.todoLists.concat({//使用concat這個api添加todo
  value: val, //輸入內(nèi)容
  isEditing: false, //是否在編輯狀態(tài)
  isActive: false, //刪除X圖標是否激活
  isChecked: false //是否已完成
 })
 this.$refs.currentInput.value = "" //按下enter添加todo之后把輸入框value清零
 window.localStorage.setItem("content",JSON.stringify(this.todoLists))//使用localStorage以JSON格式存儲數(shù)據(jù)
},

把每條todo的對應狀態(tài)都存在同一個對象當中，在操作改變todo狀態(tài)的時候不會被統(tǒng)一處理，使得每條todo都有單獨的狀態(tài)。

單條刪除todo

 <li class="content_todoList"
 v-for="(list,index) in todoLists" 
 @mouseover="list.isActive = true" //鼠標移入todo改變對應todo的isActive狀態(tài)
 @mouseleave="list.isActive=false" //鼠標移出todo改變對應todo的isActive狀態(tài)
 <span class="el-icon-close content_todoList_delete" 
 :class="{show: list.isActive}" //動態(tài)綁定class使鼠標移動到某一todo顯示X圖標
 @click="deleteTodo(index)"> //綁定刪除單條todo事件
 </span>
</li>

deleteTodo(index) { //刪除單條todo
  this.todoLists.splice(index, 1)//使用splice的api
  window.localStorage.setItem("content",JSON.stringify(todoLists)) //以JSON格式存儲數(shù)據(jù)//localStorage存儲數(shù)據(jù)
},

在每個li元素上綁定了鼠標移入和移除的事件來動態(tài)的改變每個todo的isActive，然后再使用isActive動態(tài)顯示class。

雙擊編輯todo&&單條todo已完成

<input type="checkbox" class="checkBox" 
v-model="list.isChecked">//雙向綁定isChecked

<div class="content_todoList_main" 
@dblclick="toEdit(list)" //雙擊事件
v-show="!list.isEditing" //切換元素
:class="{deleted:list.isChecked}"> //動態(tài)綁定class該表已完成todo樣式
{{list.value}}
</div>

<input type="text" class="content_todoList_main main_input" 
v-model="list.value" //雙向綁定可輸入value
v-show="list.isEditing" //切換元素
v-todo-focus="list.value" //自定義指令，雙擊之后自動focus對焦
@blur="unEdit(list)"> //綁定blur失去焦點事件


methods: {
 toEdit(obj) { //使添加的todothing可編輯
  obj.isEditing = true
 },
 
 unEdit(obj) { //使添加的todothing不可編輯
  obj.isEditing = false
 },
}

directives: { //自定義focus指令,需要一個binding參數(shù)做判斷
 "todo-focus": function (el, binding) {
  if (binding.value) {
   el.focus()
  }
 }
}

通過每個todo里的isEditing屬性控制show和是否可編輯兩個狀態(tài)，雙擊div之后改變當前todo的isEditing為true，從而顯示為input，input失去焦點之后再通過blur事件改為false。

通過todo的idChecked來控制是否已完成，從而動態(tài)改變樣式。

全部todos已完成

<span 
class="icon-down el-icon-arrow-down" //使用element庫做向下箭頭icon
v-show="todoLists.length>0" //通過todoLists控制是否顯示向下箭頭icon
@click="selectAllTodos"></span> //全部已完成事件
selectAllTodos() { //設置所有todo為已完成,使用map的api通過todo的isChecked屬性操作
 this.todoLists.map(todo => todo.isChecked = todo.isChecked ? false : true)
}

待辦todos數(shù)量顯示

<div class="data_times" v-show="times === 0"> //times為0顯示item，大于0顯示items，細節(jié)注定成敗
 <span>{{times}}</span>&nbsp item left
</div>
<div class="data_times" v-show="times > 0">
<span>{{times}}</span>&nbsp items left</div>
computed: {
 times() { //使用計算屬性計算待辦todos的次數(shù) 
  let todoArr = this.todoLists
  let times = 0
  for (let i = 0; i < todoArr.length; i++) {
   if (todoArr[i].isChecked === false) {
    times++
   }
  }
  return times
 }
},

使用了計算屬性對todoLists計算，用for循環(huán)刷選出idChecked為true的累加，最后返回times。

清除全部已完成todos

<div class="data_clearTodos" 
@click="clearTodos" 
v-show="times < todoLists.length"> //如果待辦事件次數(shù)小于總todoLists長度就顯示“clear completed”
 <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"> //如果待辦事件次數(shù)等于總todoLists長度就顯示“clear completed”
 <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ></a>
</div>

clearTodos() { //清空已完成的todoLists，使用filter的api進行篩選
 this.todoLists = this.todoLists.filter(todo => todo.isChecked === false)
 window.localStorage.setItem("content",JSON.stringify(this.todoLists)) //以json格式存儲數(shù)據(jù)
},

如果待辦todos的times小于todoLists長度，就證明有已完成的todo，就可以顯示“clear completed”，如果相等就說明沒有已完成的todo。

三種狀態(tài)篩選

所有todos，已完成todos，未完成todos篩選

<li class="content_todoList" 
v-show="defaultShow || (whichShow?list.isChecked:!list.isChecked)">

<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}" //動態(tài)class實現(xiàn)tab切換
 v-for="(item ,index) in dataStatus" v-for循環(huán)
 @click="switchStatus(index)" //切換不同tab顯示內(nèi)容
 :key="index">
  {{item}}
 </a>
</div>

switchStatus(index) { //通過if條件判斷操作
 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
 }
},

我這里是同時if條件句判斷操作，有點麻煩，目前還沒有想出來其他方案。在li元素使用三元運算符和或運算符進行操作顯示不同狀態(tài)的todos。

完整代碼

<style>
 * {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
 }

 input {
  outline: none;
 }

 ul,
 li,
 ol {
  list-style: none;
 }

 #app {
  width: 800px;
  height: 900px;
  margin: 0 auto;
  text-align: center;
  background-color: rgb(245, 245, 245);
  padding: 24px 0;
 }

 #app .header {
  font-size: 48px;
 }

 .content {
  width: 72%;
  margin: 0 auto;
  box-shadow: 0 3px 3px 2px rgba(0, 0, 0, 0.25);
  position: relative;
 }

 .icon-down {
  position: absolute;
  font-size: 24px;
  top: 16px;
  left: 16px;
  cursor: pointer;
 }

 #app .content .todos_add {
  width: 100%;
  height: 56px;
  padding: 16px 56px;
  font-size: 24px;
  border: 1px solid transparent;
 }

 .content_todoLists {
  position: relative;
  z-index: 3;
 }

 .content_todoList {
  display: flex;
  flex-direction: row;
  border-top: 1px solid #ccc;
  font-size: 24px;
  padding: 8px;
  background-color: white;
  align-items: center;
 }

 .checkBox {
  width: 20px;
  height: 20px;
  margin-left: 10px;
 }

 .content_todoList_main {
  flex: 1;
  text-align: left;
  margin-left: 16px;
  font-size: 20px;
  padding: 6px 0;
 }

 .main_input {
  position: relative;
  z-index: 1;
 }

 .content_todoList_delete {
  position: absolute;
  right: 16px;
  color: rgb(252, 55, 55);
  font-weight: 500;
  display: none;
  cursor: pointer;
 }

 .show {
  display: block;
 }

 .deleted {
  text-decoration-line: line-through;
  color: #bbb;
 }

 .show:hover {
  color: rgb(255, 0, 0);
  font-weight: 700;
 }

 ::-moz-placeholder {
  color: rgb(221, 218, 218);
 }

 ::-webkit-input-placeholder {
  color: rgb(221, 218, 218);
 }

 :-ms-input-placeholder {
  color: rgb(221, 218, 218);
 }

 .data {
  display: flex;
  justify-content: space-between;
  padding: 8px;
  font-size: 14px;
  font-weight: 300;
  color: rgb(145, 145, 145);
 }

 a {
  text-decoration: none;
  color: rgb(145, 145, 145);
 }

 .data_times {
  width: 73px;
 }

 .data_clearTodos {
  width: 142px;
 }

 .data_status a {
  display: inline-block;
  border: 1px solid transparent;
  border-radius: 2px;
  padding: 1px 4px;
  margin: 0 2px;
 }

 .data_status a:hover {
  border-color: #bbb;
 }

 .data_clearTodos a:hover {
  text-decoration-line: underline;
 }

 .active {
  box-shadow: 0 0 1px black;
 }
</style>


<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>&nbspitem left
    </div>
    <div class="data_times" v-show="times > 0">
     <span>{{times}}</span>&nbspitems 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() { //使用計算屬性計算待辦todos的次數(shù) 
    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可編輯
    obj.isEditing = true
   },
   unEdit(obj) { //使添加的todo不可編輯
    obj.isEditing = false
   },
   addTodo(e) { //添加todo
    var val = e.value
    if (val === "") {
     return
    } //如果輸入內(nèi)容為空則立即返回
    this.todoLists = this.todoLists.concat({ //使用concat這個api添加todo
     value: val, //輸入內(nèi)容
     isEditing: false, //是否在編輯狀態(tài)
     isActive: false, //刪除X圖標是否激活
     isChecked: false //是否已完成
    })
    this.$refs.currentInput.value = "" //按下enter添加todo之后把輸入框value清零
    window.localStorage.setItem("content", JSON.stringify(this.todoLists)) //使用localStorage以JSON格式存儲數(shù)據(jù)
   },
   deleteTodo(index) { //刪除todo
    this.todoLists.splice(index, 1)
    window.localStorage.setItem("content", JSON.stringify(this.todoLists)) //以json格式存儲數(shù)據(jù)
   },
   switchStatus(index) { //試下下方三個狀態(tài)切換，略麻煩
    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格式存儲數(shù)據(jù)
   },
   selectAllTodos() { //設置所有todo為已完成
    this.todoLists.map(todo => todo.isChecked = todo.isChecked ? false : true)
   }
  },
  directives: { //自定義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) || [] //因為todoLists初始值是null,使用或運算符，如果為null設為空數(shù)組
  }
 })
</script>

以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持億速云。

向AI問一下細節(jié)

免責聲明：本站發(fā)布的內(nèi)容（圖片、視頻和文字）以原創(chuàng)、轉(zhuǎn)載和分享為主，文章觀點不代表本網(wǎng)站立場，如果涉及侵權請聯(lián)系站長郵箱：is@yisu.com進行舉報，并提供相關證據(jù)，一經(jīng)查實，將立刻刪除涉嫌侵權內(nèi)容。

AI
助
手