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typescript - 根据条件选择 Vue 选项


我有以下下拉菜单模板:

<select v-model="selectedClient" class="stat-select text-u-c">
  <option disabled value="">Please select a Client</option>
  <option>{{}}</option>
</select>

...我有一个按钮click处理程序,我想根据某些条件填充<option>:

if (Department == 'IT') {
  // select option values should be A,B,C
} else (Department == 'Finance') {
  // select option values should be X,Y,Z
}

我如何才能做到这一点?

答案#1

你可以使用 Vue 的列表渲染语法 v-for:

<ELEMENT v-for="VARIABLE in ARRAY" :key="ITERATOR_ID">

在你使用 <option> 的情况下,你会有类似这样的东西:

<option v-for="item in options" :key="item.id">{{item.label}}</option>

...其中 options 是一个数据属性,包含类似这样的数组:

[
  { id: 1, label: 'A' },
  { id: 2, label: 'B' },
  { id: 3, label: 'C' },
]

如果您想根据 Department 使用一组不同的 <option>,您可以相应地将 this.options 设置为不同的数组,数据绑定将自动更新 <option>:

methods: {
  getOptions() {
    const dept = this.Department;
    if (dept === 'IT') {
      this.options = [
        { id: 1, label: 'A' },
        { id: 2, label: 'B' },
        { id: 3, label: 'C' },
      ];
    } else if (dept === 'Finance') {
      this.options = [
        { id: 4, label: 'X' },
        { id: 5, label: 'Y' },
        { id: 6, label: 'Z' },
      ];
    }
  }
}

new Vue({
  el: '#app',
  data: () => ({
    options: null,
    Department: null,
    selectedClient: null,
  }),
  methods: {
    getOptions() {
      this.selectedClient = null;
      if (this.Department === 'IT') {
        this.options = [
          { id: 1, label: 'A' },
          { id: 2, label: 'B' },
          { id: 3, label: 'C' },
        ];
      } else if (this.Department === 'Finance') {
        this.options = [
          { id: 4, label: 'X' },
          { id: 5, label: 'Y' },
          { id: 6, label: 'Z' },
        ];
      }
    }
  },
})
<script src="https://unpkg.com/[email "></script>

<div id="app">
  <div>
    <span>Department:</span>
    <input id="dept" type="radio" v-model="Department" value="IT">
    <label for="dept">IT</label>
    <input id="fin" type="radio" v-model="Department" value="Finance">
    <label for="fin">Finance</label>
    <button @click="getOptions">Get options</button>
  </div>

  <select v-model="selectedClient"  class="stat-select text-u-c">
    <option disabled value="">Please select a Client</option>
    <option v-for="item in options" :key="item.id">{{item.label}}</option>
  </select>
  
  {{selectedClient}}
</div>