每个 v-for 循环有多个 <td> 个元素

Question

在我的 Vue 应用程序中，我正在遍历一系列学校。每所学校都有一个名称、一组教师人数（每个年级一个）和一组学生人数（每个年级一个）。

以下代码有效，但这只是因为我手动编码 <td>s。

new Vue({
  el: '#app',
  data: {
    schools: [
      { name: 'Lincoln',   teachers: [3, 4, 1], students: [55, 42, 39] },
      { name: 'Oak Grove', teachers: [1, 2, 1], students: [31, 36, 23] },
      { name: 'Fairview',  teachers: [1, 3, 2], students: [30, 26, 39] },
    ],
  },
});

thead th,
tbody td { text-align: center; }

<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-beta/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.3.4/vue.min.js"></script>

<table id="app" class="table">
  <thead>
    <tr>
      <th rowspan="2"></th>
      <th colspan="2">Grade K</th>
      <th colspan="2">Grade 1</th>
      <th colspan="2">Grade 2</th>
    </tr>
    <tr>
      <th>Teachers</th>
      <th>Students</th>
      <th>Teachers</th>
      <th>Students</th>
      <th>Teachers</th>
      <th>Students</th>
    </tr>
  </thead>
  <tbody>
    <tr v-for="school in schools">
      <th>{{ school.name }}</th>
      
      <td>{{ school.teachers[0] }}</td>
      <td>{{ school.students[0] }}</td>
      
      <td>{{ school.teachers[1] }}</td>
      <td>{{ school.students[1] }}</td>
      
      <td>{{ school.teachers[2] }}</td>
      <td>{{ school.students[2] }}</td>
    </tr>
  </tbody>
</table>

注意重复行：

<td>{{ school.teachers[x] }}</td>
<td>{{ school.students[x] }}</td>

在这个简化的例子上问题不大。但是在我的真实项目中，有更多的列和子列。 有没有办法做一个重复循环来显示 <td>s？

我试过另一个 v-for 循环，但由于它在 <tr> 内，所以只允许 <td> 和 <th>。

Answer 1

假设教师和学生数组总是长度相同，您可以迭代template标签。

<tr v-for="school in schools">
  <th>{{ school.name }}</th>
  <template v-for="(cnt, idx) in school.teachers.length">
    <td>{{ school.teachers[idx] }}</td>
    <td>{{ school.students[idx] }}</td>
  </template>
</tr>

例子。

new Vue({
  el: '#app',
  data: {
    schools: [
      { name: 'Lincoln',   teachers: [2, 2, 2], students: [40, 40, 40] },
      { name: 'Oak Grove', teachers: [2, 2, 2], students: [40, 40, 40] },
      { name: 'Fairview',  teachers: [2, 2, 2], students: [40, 40, 40] },
    ],
  },
});

thead th,
tbody td { text-align: center; }

<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-beta/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.3.4/vue.min.js"></script>

<table id="app" class="table">
  <thead>
    <tr>
      <th rowspan="2"></th>
      <th colspan="2">Grade K</th>
      <th colspan="2">Grade 1</th>
      <th colspan="2">Grade 2</th>
    </tr>
    <tr>
      <th>Teachers</th>
      <th>Students</th>
      <th>Teachers</th>
      <th>Students</th>
      <th>Teachers</th>
      <th>Students</th>
    </tr>
  </thead>
  <tbody>
    <tr v-for="school in schools">
      <th>{{ school.name }}</th>
      <template v-for="(cnt, idx) in school.teachers.length">
        <td>{{ school.teachers[idx] }}</td>
        <td>{{ school.students[idx] }}</td>
      </template>
    </tr>
  </tbody>
</table>

另一种方法是将重复的元素抽象成一个组件，然后使用 special is attribute (<td is="details" v-for="..."></td>).

每个 v-for 循环有多个 <td> 个元素

Multiple <td> elements per v-for loop

javascript

vue.js

v-for