Vue component development: City selector component implementation method

<template>
  <div class="city-selector">
    <ProvinceSelector @provinceChange="handleProvinceChange" />
    <CitySelector :province="selectedProvince" @cityChange="handleCityChange" />
    <AreaSelector :city="selectedCity" @areaChange="handleAreaChange" />
    <div class="selected-result">
      <p>已选城市：{{ selectedCity }}</p>
      <p>已选区域：{{ selectedArea }}</p>
    </div>
  </div>
</template>

<script>
import ProvinceSelector from './ProvinceSelector.vue'
import CitySelector from './CitySelector.vue'
import AreaSelector from './AreaSelector.vue'

export default {
  components: {
    ProvinceSelector,
    CitySelector,
    AreaSelector
  },
  data() {
    return {
      selectedProvince: '',
      selectedCity: '',
      selectedArea: ''
    }
  },
  methods: {
    handleProvinceChange(province) {
      this.selectedProvince = province
      this.selectedCity = ''
      this.selectedArea = ''
    },
    handleCityChange(city) {
      this.selectedCity = city
      this.selectedArea = ''
    },
    handleAreaChange(area) {
      this.selectedArea = area
    }
  }
}
</script>

<template>
  <div class="province-selector">
    <select v-model="selectedProvince" @change="handleChange">
      <option v-for="province in provinces" :key="province" :value="province">{{ province }}</option>
    </select>
  </div>
</template>

<script>
export default {
  data() {
    return {
      selectedProvince: ''
    }
  },
  computed: {
    provinces() {
      // 从后台或静态数据获取省份列表
      return ['北京', '上海', '广东', '江苏']
    }
  },
  methods: {
    handleChange() {
      this.$emit('provinceChange', this.selectedProvince)
    }
  }
}
</script>

<template>
  <div class="city-selector">
    <select v-model="selectedCity" @change="handleChange">
      <option v-for="city in cities" :key="city" :value="city">{{ city }}</option>
    </select>
  </div>
</template>

<script>
export default {
  props: {
    province: {
      type: String,
      default: ''
    }
  },
  data() {
    return {
      selectedCity: ''
    }
  },
  computed: {
    cities() {
      // 根据选择的省份从后台或静态数据获取城市列表
      if (this.province === '北京') {
        return ['北京市', '朝阳区', '海淀区']
      } else if (this.province === '上海') {
        return ['上海市', '黄浦区', '徐汇区']
      } else if (this.province === '广东') {
        return ['广州市', '深圳市', '珠海市']
      } else if (this.province === '江苏') {
        return ['南京市', '苏州市', '无锡市']
      } else {
        return []
      }
    }
  },
  watch: {
    province(newValue) {
      this.selectedCity = ''
    }
  },
  methods: {
    handleChange() {
      this.$emit('cityChange', this.selectedCity)
    }
  }
}
</script>

<template>
  <div class="area-selector">
    <select v-model="selectedArea" @change="handleChange">
      <option v-for="area in areas" :key="area" :value="area">{{ area }}</option>
    </select>
  </div>
</template>

<script>
export default {
  props: {
    city: {
      type: String,
      default: ''
    }
  },
  data() {
    return {
      selectedArea: ''
    }
  },
  computed: {
    areas() {
      // 根据选择的城市从后台或静态数据获取区域列表
      if (this.city === '北京市') {
        return ['东城区', '西城区', '朝阳区']
      } else if (this.city === '上海市') {
        return ['黄浦区', '徐汇区', '长宁区']
      } else if (this.city === '广州市') {
        return ['越秀区', '海珠区', '天河区']
      } else if (this.city === '南京市') {
        return ['玄武区', '秦淮区', '鼓楼区']
      } else {
        return []
      }
    }
  },
  watch: {
    city(newValue) {
      this.selectedArea = ''
    }
  },
  methods: {
    handleChange() {
      this.$emit('areaChange', this.selectedArea)
    }
  }
}
</script>

<template>
  <div>
    <CitySelector />
  </div>
</template>

<script>
import CitySelector from './CitySelector.vue'

export default {
  components: {
    CitySelector
  }
}
</script>