Vue官网todoMVC示例代码

这个示例是模仿官网示例样式和功能用我自己的方式写的，基本上没有看官网的源码，只参考自定义指令。让我们一步步来探讨一下。官网demo

要实现的功能

单条添加todo
单条删除todo
双击编辑todo
单条todo已完成相应样式状态改变
全部todo是已完成相应样式状态改变
清除全部已完成todos
待办todos数量显示
所有todos，已完成todos，未完成todos筛选

单条添加todo

<input type=\"text\" class=\"todos_add\" placeholder=\"What needs to be done?\" 
@keyup.enter=\"addTodo($event.target)\" //绑定enter事件
ref=\"currentInput\">//操作input元素使enter一下之后清空输入框内容

data() {//一些初始化数据
 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
},

把每条todo的对应状态都存在同一个对象当中，在操作改变todo状态的时候不会被统一处理，使得每条todo都有单独的状态。

单条删除todo

 <li class=\"content_todoList\"
 v-for=\"(list,index) in todoLists\" 
 @mouseover=\"list.isActive = true\" //鼠标移入todo改变对应todo的isActive状态
 @mouseleave=\"list.isActive=false\" //鼠标移出todo改变对应todo的isActive状态
 <span class=\"el-icon-close content_todoList_delete\" 
 :class=\"{show: list.isActive}\" //动态绑定class使鼠标移动到某一todo显示X图标
 @click=\"deleteTodo(index)\"> //绑定删除单条todo事件
 </span>
</li>

deleteTodo(index) { //删除单条todo
  this.todoLists.splice(index, 1)//使用splice的api
  window.localStorage.setItem(\"content\",JSON.stringify(todoLists)) //以JSON格式存储数据//localStorage存储数据
},

在每个li元素上绑定了鼠标移入和移除的事件来动态的改变每个todo的isActive，然后再使用isActive动态显示class。

双击编辑todo&&单条todo已完成

<input type=\"checkbox\" class=\"checkBox\" 
v-model=\"list.isChecked\">//双向绑定isChecked

<div class=\"content_todoList_main\" 
@dblclick=\"toEdit(list)\" //双击事件
v-show=\"!list.isEditing\" //切换元素
:class=\"{deleted:list.isChecked}\"> //动态绑定class该表已完成todo样式
{{list.value}}
</div>

<input type=\"text\" class=\"content_todoList_main main_input\" 
v-model=\"list.value\" //双向绑定可输入value
v-show=\"list.isEditing\" //切换元素
v-todo-focus=\"list.value\" //自定义指令，双击之后自动focus对焦
@blur=\"unEdit(list)\"> //绑定blur失去焦点事件

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

directives: { //自定义focus指令,需要一个binding参数做判断
 \"todo-focus\": function (el, binding) {
  if (binding.value) {
   el.focus()
  }
 }
}

通过每个todo里的isEditing属性控制show和是否可编辑两个状态，双击div之后改变当前todo的isEditing为true，从而显示为input，input失去焦点之后再通过blur事件改为false。

通过todo的idChecked来控制是否已完成，从而动态改变样式。

全部todos已完成

<span 
class=\"icon-down el-icon-arrow-down\" //使用element库做向下箭头icon
v-show=\"todoLists.length>0\" //通过todoLists控制是否显示向下箭头icon
@click=\"selectAllTodos\"></span> //全部已完成事件

selectAllTodos() { //设置所有todo为已完成,使用map的api通过todo的isChecked属性操作
 this.todoLists.map(todo => todo.isChecked = todo.isChecked ? false : true)
}

待办todos数量显示

<div class=\"data_times\" v-show=\"times === 0\"> //times为0显示item，大于0显示items，细节注定成败
 <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
 }
},

使用了计算属性对todoLists计算，用for循环刷选出idChecked为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\"> //如果待办事件次数小于总todoLists长度就显示“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\"> //如果待办事件次数等于总todoLists长度就显示“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进行筛选
 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
},

如果待办todos的times小于todoLists长度，就证明有已完成的todo，就可以显示“clear completed”，如果相等就说明没有已完成的todo。

三种状态筛选

所有todos，已完成todos，未完成todos筛选

<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}\" //动态class实现tab切换
 v-for=\"(item ,index) in dataStatus\" v-for循环
 @click=\"switchStatus(index)\" //切换不同tab显示内容
 :key=\"index\">
  {{item}}
 </a>
</div>

switchStatus(index) { //通过if条件判断操作
 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
 }
},

我这里是同时if条件句判断操作，有点麻烦，目前还没有想出来其他方案。在li元素使用三元运算符和或运算符进行操作显示不同状态的todos。

完整代码

<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>

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