Element随手小记

<template>
  <el-checkbox :indeterminate="isIndeterminate" v-model="checkAll" @change="handleCheckAllChange">全选</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', '广州', '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>