javascript - Vuetify 多个 v-select 所需规则不起作用

Question

重现步骤:
如果它的多项选择所需的规则不起作用，如果它不是一个倍数就可以了。
预期行为
规则也适用于多项选择
实际行为
如果它的多重选择规则不起作用
复制代码:

 <div id="app">
     <v-app id="inspire">
      <v-select
         :items="role"
         label="Admin level*"
         class="mt-3 "
         @focus="reset"
         item-text="name"
         item-value="name"
         v-model="roleee"
         required
         :rules="rules.select"
      ></v-select>
      <v-select
         :items="subsidiaries"
         label="Subsidiary*"
         class="mt-3 "
         @focus="reset"
         item-text="name"
         item-value="name"            
         v-model="subsidiariesss"
         multiple
         required
         :rules="rules.select"
         :menu-props="{ bottom: true, offsetY: true }"
       ></v-select>
      </v-app>
     </div>
     <script>
        new Vue({
        el: '#app',
        data: {
         role:[
          {name:'Admin', id:1},
          {name: 'SuperAdmin', id:2}
          ], 
          subsidiaries: [
           {name: "ASdsad", id:1},
           {name: "dsd", id:2},
           {name: "34", id:3},
           {name: "ASvxcdsad", id:4}
          ],
          rules: {
           select: [v => !!v || 'Item is required'] 
          }
          },
        methods: {
         reset() {
          this.$refs.form.resetValidation();
         },
        }
       })
      </script>

Answer 1

您应该添加另一个名为 select2 的规则验证所选项目的长度:

 rules: {
      select: [(v) => !!v || "Item is required"],
      select2: [(v) =>  v.length>0 || "Item is required in select 2"],
      
    }

然后将其绑定(bind)到第二个选择，如下所示:

 <v-select
         :items="subsidiaries"
         label="Subsidiary*"
         class="mt-3 "
         @focus="reset"
         item-text="name"
         item-value="name"            
         v-model="subsidiariesss"
         multiple
         required
         :rules="rules.select2"
         :menu-props="{ bottom: true, offsetY: true }"
       ></v-select>

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