Question

我试图在Vuejs 2.0中切换多个元素的类，我有以下一组按钮，其类为btn-primary。单击按钮可显示该特定元素的子组。这是我的代码：

<button class="btn btn-primary btn-xs" v-on:click.prevent="getTags('investor')">Investor</button>
<button class="btn btn-primary btn-xs" v-on:click.prevent="getTags('research')">Research</button>
<button class="btn btn-primary btn-xs" v-on:click.prevent="getTags('company')">Company</button>

这显示以下元素：

<div v-if="tag.investor">
    <button class="btn btn-primary btn-xs" v-on:click.prevent="selectTags('Investor - Mutual Funds')">Mutual Fund</button>
    <button class="btn btn-primary btn-xs" v-on:click.prevent="selectTags('Investor - Insurance')">Insurance</button>
    <button class="btn btn-primary btn-xs" v-on:click.prevent="selectTags('Investor - FII')">FII</button>
</div>
<div v-if="tag.research">
    <button class="btn btn-primary btn-xs" v-on:click.prevent="selectTags('Research - Tier I')">Research - Tier I</button>
    <button class="btn btn-primary btn-xs" v-on:click.prevent="selectTags('Research - Tier II')">Research - Tier II</button>
</div>

我在data()中有以下内容：

tag: {
    investor: false,
    research: false,
    company: false,
    others: false,
 },

在methods：

getTags: function (tag) {
    this.tag.investor = this.tag.research = this.tag.company = this.tag.others = false
    if(tag == 'investor')
    {
        this.tag.investor = true
    }
    if(tag == 'research')
    {
        this.tag.research = true
    }
    if(tag == 'company')
    {
        this.tag.company = true
    }
    if(tag == 'others')
    {
        this.tag.others = true
    }
},

我希望有一个btn-warning类，并在选择任何子元素后删除btn-primary。任何想法如何实现这一点，我都不想拥有单独的数据元素和切换类。

Answer 1

我想为您的Vue建议一种数据驱动方法。考虑这个数据结构：

const tags = {
   Investor:[
     {display:"Mutual Fund", value:"Investor - Mutual Funds"},
     {display:"Insurance", value:"Investor - Insurance"},
     {display:"FII", value:"Investor - FII"},
   ],
   Research:[
     {display:"Research - Tier I", value:"Research - Tier I"},
     {display:"Research - Tier II", value:"Research - Tier II"},
  ]
}

如果您使用它，那么您可以大大清理模板并处理您添加到数据结构中的任何其他标记。

<div id="app">
  <button v-for="(obj, key) in tags"
          :key="key"
          @click="currentTag = key"
          class="btn btn-xs btn-primary">
    {{key}}
  </button>

  <div>  
    <button v-for="tag in tags[currentTag]"
            :key="tag"
            class="btn btn-xs"
            :class="tagClass(tag)"
            @click="selectTags(tag.value)">
      {{tag.display}}
    </button>
  </div>
</div>

你的Vue看起来也更清洁了。

new Vue({
  el:"#app",
  data:{
    currentTag: null,
    tags,
    selectedTags:[]
  },
  methods:{
    selectTags(tag){
      const index = this.selectedTags.findIndex(t => t == tag)

      if (index >= 0)
        this.selectedTags.splice(index, 1)
      else
        this.selectedTags.push(tag)
    },
    tagClass(tag){
      const isSelected = this.selectedTags.includes(tag.value)

      return {
        'btn-warning': isSelected,
        'btn-primary': !isSelected
      }
    }
  }
})

这是example。

Answer 2

您可以使用v-bind:class指令。

<button 
  class="btn btn-xs" 
  v-bind:class="{ 'btn-warning': tag.research, 'btn-primary': !tag.research }"
  v-on:click.prevent="selectTags('Research - Tier I')"
>
  Research - Tier I
</button>

如何在vue js中切换多个元素的类

2 个答案: