vue.js绑定了列表中每个项目的样式(类)，其中v-for取决于项目数据

Question

我有一个带有一系列项目作为数据的vue对象(在我的情况下是飞行计划(。到目前为止，该列表的渲染正确。

现在出现了问题。我想在列表中使用v-for迭代时将不同的样式应用于列表中的每个项目(Flightplan(，取决于当前迭代的Flighplan Memeber fplType的值。当前所有列表项目(Flightplans(获取flightplan-list-ifr-dep类。

，但我需要(伪代码(之类的东西：

<li v-for="flightplan in flightplans"
    v-bind:id="flightplan.id"                        
    v-bind:class="{
      flightplan-list-ifr-dep: flightplan.fplType === 'departure',
      flightplan-list-ifr-arr: flightplan.fplType === 'arrival'
    }"
>

因此，每个项目都从当前迭代飞行计划的fpltype中获取自己的分类。

<div id="flightplan-list-area" class="flightplan-list-area-style">
  <ul>
    <li v-for="flightplan in flightplans"
      v-bind:id="flightplan.id"
      @click="selected(flightplan, $event)">
      <div class="flightplan-list-ifr-dep">
          <p class="flightplan-list-ifr-dep-callsign">{{ flightplan.callsign }}</p>
          <p class="flightplan-list-ifr-dep-aircraft-type">{{ flightplan.aircraft_type }}</p>
          <p class="flightplan-list-ifr-dep-aircraft-wtc">{{ flightplan.aircraft_wtc }}</p>
      </div>
    </li>
   </ul>
</div>

<script lang="javascript"> 
var vue_FLIGHTPLAN_MODEL = new Vue({
  el: "#flightplan-list-area",
  data: {
    flightplans: [],
    selected_flightplan_element: null,
  },
});
</script>

Answer 1

您的语法几乎是正确的，但是由于您的类名称包含" - "字符，因此您只需要在v-bind:class中引用它们：

...
v-bind:class="{
    'flightplan-list-ifr-dep': flightplan.fplType === 'departure',
    'flightplan-list-ifr-arr': flightplan.fplType === 'arrival'
}"
...

实时演示

var vue_FLIGHTPLAN_MODEL = new Vue({
  el: "#flightplan-list-area",
  data: {
    flightplans: [
      { id: 1, callsign: 'ABC', aircraft_type: 'Boeing 737', aircraft_wtc: 'xyz', fplType: 'departure' },
      { id: 2, callsign: 'DEF', aircraft_type: 'Boeing 737', aircraft_wtc: 'uvw', fplType: 'arrival' },
      { id: 3, callsign: 'HIJ', aircraft_type: 'Boeing 737', aircraft_wtc: 'abc', fplType: 'departure' },
    ],
    selected_flightplan_element: null,
  },
  
  methods: {
    selected (plan, e) {
      this.selected_flightplan_element = plan;
    }
  },
});

li.flightplan-list-ifr-dep {
  color: blue;
}
li.flightplan-list-ifr-arr {
  color: green;
}

<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<div id="flightplan-list-area" class="flightplan-list-area-style">
  <ul>
    <li v-for="flightplan in flightplans"
                v-bind:id="flightplan.id"
                v-bind:class="{
                        'flightplan-list-ifr-dep': flightplan.fplType === 'departure',
                        'flightplan-list-ifr-arr': flightplan.fplType === 'arrival'
                    }"
                @click="selected(flightplan, $event)">
                <div class="flightplan-list-ifr-dep">
                    <p class="flightplan-list-ifr-dep-callsign">{{ flightplan.callsign }}</p>
                    <p class="flightplan-list-ifr-dep-aircraft-type">{{ flightplan.aircraft_type }}</p>
                    <p class="flightplan-list-ifr-dep-aircraft-wtc">{{ flightplan.aircraft_wtc }}</p>
                </div>
            </li>
   </ul>
</div>

Answer 2

您可以使用对象样式语法这样的语法：

<li v-for="flightplan in flightplans">
  <div :class="{
    'fpl-foo': flightplan.fplType === 1,
    'fpl-bar': flightplan.fplType === 2,
    'fpl-baz': flightplan.fplType === 3
  }">
    <!-- ... -->
  </div>
</li>

...或使用方法：

<li v-for="flightplan in flightplans">
  <div :class="getClass(flightplan.fplType)">
    <!-- ... -->
  </div>
</li>
methods: {
  getClass (fplType) {
    // Determine the class and return it,
    // this can also be an array in case
    // of more than one class
  }
}

Answer 3

您的伪代码是正确的。您可以动态绑定一类。请参阅类和样式绑定

因此，以下代码将为您工作：

<li v-for="flightplan in flightplans"
    :key="flightplan.id"
    v-bind:id="flightplan.id"                        
    v-bind:class="{
           'flightplan-list-ifr-dep': flightplan.fplType === 'departure',
           'flightplan-list-ifr-arr': flightplan.fplType === 'arrival'
          }"
 >

使用v-for时，建议始终使用唯一的键。

我为您做了一个简单的示例。