技術標籤：前端vue3vue3element-plustypescript前端

vue3+Elament Plus開發：Element Plus多選框 TypeScript 下報錯修復

問題描述

Element Plus 的多選框，根據官方文件的示例，在 ts 模式下是無法執行的；
既然用了VUE3，那我們就用VUE3的寫法改寫下。

官方程式碼示例

<template>
  <el-checkbox :indeterminate="isIndeterminate" v-model="checkAll" @change="handleCheckAllChange"
 
>全選</el-checkbox>
  <div style="margin: 15px 0;"></div>
  <el-checkbox-group v-model="checkedCities" @change="handleCheckedCitiesChange">
    <el-checkbox v-for="city in cities" :label="city" :key="city">{{city}
 
}</el-checkbox>
  </el-checkbox-group>
</template>
<script>
  const cityOptions = ['上海', '北京', '廣州', '深圳'];
  export default {
    data() {
      return {
        checkAll: false,
        checkedCities: ['上海', '北京'],
        cities: cityOptions,
        isIndeterminate: true
      }
 
;
    },
    methods: {
      handleCheckAllChange(val) {
        this.checkedCities = val ? cityOptions : [];
        this.isIndeterminate = false;
      },
      handleCheckedCitiesChange(value) {
        let checkedCount = value.length;
        this.checkAll = checkedCount === this.cities.length;
        this.isIndeterminate = checkedCount > 0 && checkedCount < this.cities.length;
      }
    }
  };
</script>

改寫後的程式碼示例

預設全選：

<template>
  <el-checkbox :indeterminate="isIndeterminate" v-model="checkAll" @change="handleCheckAllChange">全選</el-checkbox>
  <div style="margin: 15px 0;"></div>
  <el-checkbox-group v-model="checkedCities" @change="handleCheckedCitiesChange">
    <el-checkbox v-for="city in cities" :label="city" :key="city">{{city}}</el-checkbox>
  </el-checkbox-group>
</template>
<script lang="ts">
import { ref, reactive, toRefs } from 'vue'
const cityOptions = ['上海', '北京', '廣州', '深圳'];
export default {
setup () {
    const data = reactive({
      checkAll: true,
      checkedCities: cityOptions,
      cities: cityOptions,
      isIndeterminate: false,
      handleCheckAllChange: (val: boolean) => {
        data.checkedCities = val ? cityOptions : []
        data.isIndeterminate = false
      },
      handleCheckedTagsChange (value: string) {
        const checkedCount = value.length
        data.checkAll = checkedCount === data.cities.length
        data.isIndeterminate = checkedCount > 0 && checkedCount < data.cities.length
      }
    })
    const refData = toRefs(data)
    return {
      ...refData
    }
}

};
</script>