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下午好,我正在尝试使用转换组为日历中的交换动画设置动画并弹出这样的错误,我知道它说“不要使用 v-for 循环索引作为键”,但是当我删除它们会导致另一个错误,即转换组中的所有项目都必须具有自己的唯一键。另外,也许您知道一些有用的导师或任何可能对我理解过渡有用的文章,请提供链接。

日历和错误的屏幕截图

    <template>
  <div class="all">
      <div class="pagination">
        <div @click="prevPage" class="btn-left"><</div> 
        <p>{{ nameOfOneMonth }} {{ year }}</p>
        <div @click="nextPage" class="btn-right">></div> 
      </div>

        <div class="d_nameOfDays">
          <li v-for="day in nameOfDays" class="nameOfDays">{{ day }}</li>
        </div>
        <transition-group name="fade" >
          <div v-for="(week, i) in getCalendar" class="d_day" :key = "i">
            <li v-for="(day, h) in week" class="li_day" :key = "h">
            <div class="day" 
               v-bind:class="{ 'grey': isAnotherMonth(i, day), 'currentDay': currentDayOnCalendar(day) }"
               >{{ day }}</div>
          </li>
        </div>
        </transition-group>
  </div> 
</template>

<script>

export default {
  data(){
    return{
      currentPage: 0,
      namesOfMonths: ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
      nameOfOneMonth: '',
      nameOfDays: ['Пн', 'Вт', 'Ср', 'Чт', 'Пт', 'Сб', 'Вс'],
      date: new Date(),
      isActive: true,
      year: ''
    }
  },
  computed: {
    getCalendar(){
      return this.buildCalendar();
    }
  },
  mounted(){
    this.year = this.date.getFullYear();
    this.currentPage = this.date.getMonth();
    this.nameOfOneMonth = this.namesOfMonths[this.currentPage];
  },
  methods: {
    prevPage(){
      if (this.currentPage === 0) {
        this.currentPage = 12;
        this.year--;
      }
      this.currentPage--;
      this.nameOfOneMonth = this.namesOfMonths[this.currentPage];
    },
    nextPage(){
      if (this.currentPage === 11) {
        this.currentPage = -1;
        this.year++;
      }
      this.currentPage++;
      this.nameOfOneMonth = this.namesOfMonths[this.currentPage];
    },
    isAnotherMonth(weekIndex, dayNumber) {
      if(weekIndex === 0 && dayNumber > 15) {
        // первая неделе и номер дня > 15
        return true
      }
      if (weekIndex === 4 && dayNumber < 15) {
        // последняя неделя и номер дня < 15
        return true
      }
      // день принадлежит текущему месяцу
      return false
    },
    currentDayOnCalendar(dayNumber){
      if(this.currentPage === this.date.getMonth() && dayNumber === this.date.getDate()){
        return true
      }
      return false
    },
    getYear(){
      this.year = this.date.getFullYear();
    },
    getLastDayOfMonth(month) { // нахождение числа последнего дня в месяце
      let dateDaysInMonth = new Date(this.year, month + 1, 0);
      return dateDaysInMonth.getDate();
    },
    getNumberOfFirstDayInMonth(month){ //нахождение номера первого дня в месяце
      let dateFirstDayInMonth = new Date(this.year, month, 1);
      return dateFirstDayInMonth.getDay();
    },
    buildCalendar(){
      let massOfMonth = [];
      for (let months = 0; months < 12; months++){
        massOfMonth.push(months);
        massOfMonth[months] = [];
        for ( let daysInMonth = 1; daysInMonth <= this.getLastDayOfMonth(months); daysInMonth++){
          massOfMonth[months].push(daysInMonth);
        }
        // Заполняем начало каждого месяца числами из прошлого месяца
        if(this.getNumberOfFirstDayInMonth(months) > 0){
          let t = this.getLastDayOfMonth(months-1) + 1;
          for(let b = 0; b <= this.getNumberOfFirstDayInMonth(months) - 2; b++){
            t--;
            massOfMonth[months].unshift(t)
          }
        }else if(this.getNumberOfFirstDayInMonth(months) === 0){
          let t = this.getLastDayOfMonth(months-1) + 1;
          for(let nulldays = 0; nulldays <= 5; nulldays++){
            t--;
            massOfMonth[months].unshift(t);
          }
        }
        //Заполняем конец каждого месяца числами из будущего месяца
        if(this.getNumberOfFirstDayInMonth(months + 1) > 1){
          let t = 0;
          for(let q = this.getNumberOfFirstDayInMonth(months + 1); q <= 7; q++){
            t++;
            massOfMonth[months].push(t);
          }
        } else if(this.getNumberOfFirstDayInMonth(months + 1) === 0){
          massOfMonth[months].push(1);
        }
      }

      // разбиение большого массива месяц на 
      // меньшие массивы которые имеют по 7 элементов
      var longArray = massOfMonth[this.currentPage];
      var size = 7;

      var newArray = new Array(Math.ceil(longArray.length / size)).fill("")
          .map(function() { 
            return this.splice(0, size) 
          }, longArray.slice());
       //--------------------------------------------------   
        return newArray; // вывод самого календаря
    }
  }
};
</script>

<style>
  body{
    background-color: #FAFAFA;
  }
  .pagination{
    display: grid;
    height: 40px;
    grid-template-columns: 1fr 4fr 1fr;
    margin: 20px 80% auto 5%;
    background-color: white;
  }
  .btn-left, .btn-right{
    padding: 10px 10px;
    height: 20px;
    font-weight: bold;
    font-size: 18px;
  }
  .btn-left:hover, .btn-right:hover{
    background-color: #9D9D9D;
    color: white;
    cursor: pointer;
  }
  .pagination p{
    text-align: center;
    font-size: 18px;
    margin-top: 10px;
    font-weight: bold;
  }
  .d_nameOfDays{
    display: grid;
    height: 25px;
    grid-template-columns: 1fr 1fr 1fr 1fr 1fr 1fr 1fr;
    margin: 0 80% auto 5%;
    background-color: #DEDEDE;;
    list-style-type: none;
    text-align: center;
    padding-top: 5px;
  }
  .d_day{
    display: grid;
    height: 23px;
    grid-template-columns: 1fr 1fr 1fr 1fr 1fr 1fr 1fr;
    margin: 0 80% auto 5%;
    background-color: white;
    list-style-type: none;
    text-align: center;
    padding-top: 3px;
  }
  .day{
    border: 1px solid white;
  }
  .day:hover{
    cursor: pointer;
    border-radius: 10%;
    border: 1px solid #BAAAAA;
  }
  .grey{
    color: #BAAAAA;
  }
  .currentDay{
    background: #16B9DE; 
    border-radius: 10%;
  }
4

2 回答 2

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我找到了解决此问题的方法,以下操作对我有所帮助。从 .d_day 和 .li_day 元素中删除键。.d_day 元素添加了一个共享 div,将 currentPage 设置为当前 div 的键,并将 transition-group 替换为过渡。

<template>
  <div class="all">
      <div class="pagination">
        <div @click="prevPage" class="btn-left"><</div> 
        <p>{{ nameOfOneMonth }} {{ year }}</p>
        <div @click="nextPage" class="btn-right">></div> 
      </div>

        <div class="d_nameOfDays">
          <li v-for="day in nameOfDays" class="nameOfDays">{{ day }}</li>
        </div>
        <transition name="fade" >
          <div :key="currentPage">
            <div v-for="(week, i) in getCalendar" class="d_day">
            <li v-for="day in week" class="li_day">
            <div class="day" 
               v-bind:class="{ 'grey': isAnotherMonth(i, day), 'currentDay': currentDayOnCalendar(day) }"
               >{{ day }}</div>
              </li>
            </div>
          </div>
        </transition>
  </div> 
</template>
于 2019-07-19T13:27:19.967 回答
0

组件的键很重要,因为它允许 Vue 准确跟踪哪个元素。使用索引时,可能会将相同的索引分配给不同的组件。可以使用数组或删除元素,虽然你知道它不会(工作日不会改变),但 Vue 没有这样的确定性。这就是此错误消息试图告诉您的内容。

为了解决它,您可以为每个元素添加显式索引。例如,工作日可能具有以下格式:

const weekdays = [
    { id: 1, name: 'Monday' },
    { id: 2, name: 'Tuesday' },
    // ...
    { id: 7, name: 'Sunday' },
];

然后,您可以使用id属性作为密钥的唯一值。

于 2019-07-19T12:29:20.630 回答