javascript - 如何使用 vue-multiselect 的 v-model 值选中复选框

Question

问题:创建的选定选项复选框未被选中，我希望复选框被选中，而不考虑checked true/false

注意:我总是想要没有checked状态的值(value)模型

下图显示了我的问题(请看黄色区域)

这是我尝试过的:

new Vue({
    components: {
    Multiselect: window.VueMultiselect.default
    },
    data: {
    value: [],
    options: [
        {   language: 'JavaScript', library: 'Vue.js', checked: false },
      { language: 'JavaScript', library: 'Vue-Multiselect', checked: false },
      { language: 'JavaScript', library: 'Vuelidate', checked: false }
    ]
    },
  methods: {
    customLabel (option) {
      return `${option.library} - ${option.language}`
    },
    onSelect (option) {
        console.log("Added");
      let index = this.options.findIndex(item => item.library==option.library);
      this.options[index].checked = true;
      console.log(option.library + "  Clicked!! " + option.checked);
    },
    
    onRemove (option) {
        console.log("Removed");
      let index = this.options.findIndex(item => item.library==option.library);
      this.options[index].checked = false;
      console.log(option.library + "  Removed!! " + option.checked);
    }
  },
  created(){
       this.value = [{  language: 'JavaScript', library: 'Vue.js',checked:true }];
  }
}).$mount('#app')

* {
  font-family: 'Lato', 'Avenir', sans-serif;
}

.checkbox-label {
  display: block;
}

.test {
  position: absolute;
  right: 1vw;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<link href="https://unpkg.com/vue-multiselect@2.0.2/dist/vue-multiselect.min.css" rel="stylesheet"/>
<script src="https://unpkg.com/vue-multiselect@2.0.3/dist/vue-multiselect.min.js"></script>
<div id="app">
  <multiselect 
    select-Label=""
    selected-Label=""
    deselect-Label=""
    v-model="value" 
    :options="options"
    :multiple="true"
    track-by="library"
    :custom-label="customLabel"
    :close-on-select="false"
    @select=onSelect($event)
    @remove=onRemove($event)
    >
    <span class="checkbox-label" slot="option" slot-scope="scope" @click.self="select(scope.option)">
    {{ scope.option.library }}
      <input class="test" type="checkbox" v-model="scope.option.checked" @focus.prevent/>
      
    </span>
  </multiselect>
  <pre>{{ value }}</pre>
</div>

请提前帮助我谢谢!!

Answer 1

要理解您真正想要的东西有点困难，但假设:

1. 您想呈现复选框
2. 您不需要 v-model 中的 checked 字段(因此添加它只是为了帮助呈现复选框)

您根本不需要 checked 属性，因为可以通过针对 v-model 的简单检查轻松替换该值。这样您就可以删除很多不必要的代码。

请参阅下面的示例:

new Vue({
  components: {
    Multiselect: window.VueMultiselect.default
  },
  data: {
    value: [],
    options: [{
        language: 'JavaScript',
        library: 'Vue.js'
      },
      {
        language: 'JavaScript',
        library: 'Vue-Multiselect'
      },
      {
        language: 'JavaScript',
        library: 'Vuelidate'
      }
    ]
  },
  methods: {
    customLabel(option) {
      return `${option.library} - ${option.language}`
    },
    isSelected(option) {
      /* unfortunatelly following line does not work as VueMultiselect for some (strange) reason 
        fills the v-model array with copies instead of original objects contained in options
      */
      // return this.value.includes(option)
      return this.value.some((op) => op.library === option.library)
    }
  },
  created() {
    this.value.push(this.options[0])
  }
}).$mount('#app')

* {
  font-family: 'Lato', 'Avenir', sans-serif;
}

.checkbox-label {
  display: block;
}

.test {
  position: absolute;
  right: 1vw;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<link href="https://unpkg.com/vue-multiselect@2.0.2/dist/vue-multiselect.min.css" rel="stylesheet" />
<script src="https://unpkg.com/vue-multiselect@2.0.3/dist/vue-multiselect.min.js"></script>
<div id="app">
  <multiselect select-Label="" selected-Label="" deselect-Label="" v-model="value" :options="options" :multiple="true" track-by="library" :custom-label="customLabel" :close-on-select="false">
    <span class="checkbox-label" slot="option" slot-scope="scope">
    {{ scope.option.library }}
      <input class="test" type="checkbox" :checked="isSelected(scope.option)" @focus.prevent :key="scope.option.library" />
    </span>
  </multiselect>
  <pre>{{ value }}</pre>
</div>