The VUE + ElementUI select box can be multi-selected, but the "All" option is selected, and others are not selectable

Project scenario:

For example: a drop-down multi-selection box is required in the project, in which there is an all option, if this item is selected, other options are not available

---

solution:

First of all, you need to add an attribute to el-select multipleto make the single selection multi-selectable. At this time, the bound value is actually one 数组instead of a string. We put forward the "all" option separately as a judgment condition. If selected, the attributes of other options will be used disabled = true, and other options in the bound value will be清空

Go directly to the code:

    <el-select
      v-model="method"
      multiple
      :placeholder="请选择"
      @change="hideOther()"
     >
       <el-option
          key="-1"
          label="全部"
          value="all"
       />
       <el-option
          v-for="(item, i) in methods"
          :key="i"
          :label="item.label"
          :value="item.value"
        />
    </el-select>

    hideOther() {
    
    
      // 数组的indexOf方法，会返回当前值在数组中的下标，没有则为-1
      if (this.method.indexOf('all') === -1) {
    
    
        this.methods.map((item) => {
    
    
          item.disabled = false
        })
      } else {
    
    
        this.methods.map((item) => {
    
    
          item.disabled = true
        })
        this.method = ['all']
      }
    }

Reference article: https://blog.csdn.net/lixiaohua66/article/details/113247690