Vuetify/VueJS - md/lg/xl 的多个条件

Question

我在 Vue/Vuetify

中的断点上应用条件时遇到困难

基本上我想说...如果数组的长度能被2整除，那么MD=6，如果能被3整除那么MD=12

<v-col cols="12"
    :md="module.plannings.length % 2 === 0 ? 6  ? module.plannings.length % 2 === 0 ? 12 : 12"
    v-for="planning in module.plannings"
    :key="planning.id"
>

很明显，我在这里的处理方式是错误的。正确的语法是什么？

Answer 1

你可以计算属性:

new Vue({
  el: '#app',
  vuetify: new Vuetify(),
  data() {
    return {
      module: {id: 0, plannings: [0,1,2,3,4,5]}
    }
  },
  computed: {
    msize() {
      return this.module.plannings.length % 2 === 0 ? 
        6 : this.module.plannings.length % 3 === 0 ? 
        12 : 12
    }
  }
})

<link href="https://fonts.googleapis.com/css?family=Roboto:100,300,400,500,700,900" rel="stylesheet">
<link href="https://cdn.jsdelivr.net/npm/@mdi/font@6.x/css/materialdesignicons.min.css" rel="stylesheet">
<link href="https://cdn.jsdelivr.net/npm/vuetify@2.x/dist/vuetify.min.css" rel="stylesheet">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no, minimal-ui">
<div id="app">
  <v-app>
    <v-main>
      <v-container>
        <v-col cols="12"
            :md="msize"
            v-for="planning in module.plannings"
            :key="planning.id"
        >
        {{planning}}
        </v-col>
      </v-container>
    </v-main>
  </v-app>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2.x/dist/vue.js"></script>
<script src="https://cdn.jsdelivr.net/npm/vuetify@2.x/dist/vuetify.js"></script>

Answer 2

正确的语法是:md="plannings.length % 2 === 0 ? 6 : 12"

演示 :

new Vue({
  el: '#app',
  vuetify: new Vuetify(),
  data: () => ({
    plannings: [{
      id: 1
    }, {
      id: 2
    }]
   }),
});

<script src="https://cdn.jsdelivr.net/npm/vue@2.x/dist/vue.js"></script>
<script src="https://cdn.jsdelivr.net/npm/vuetify@2.x/dist/vuetify.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/vuetify@2.x/dist/vuetify.min.css"/>
<div id="app">
  <v-row>
    <v-col
           :md="plannings.length % 2 === 0 ? 6 : 12"
           v-for="planning in plannings"
           :key="planning.id"
           style="background-color: yellow"
           >
           {{ planning.id }}
    </v-col>
  </v-row>
</div>

Vuetify/VueJS - md/lg/xl 的多个条件

Vuetify/VueJS - Multiple conditions on md/lg/xl

javascript

vue.js

vuejs2

vuetify.js