微信小程序 select 下拉框组件

<view class="select-box">
  <view class="select-current" catchtap="openClose">
    <text class="current-name">{{current.name}}</text>
  </view>
  <view class="option-list" wx:if="{{isShow}}" catchtap="optionTap">
    <text class="option"
      data-id="{{defaultOption.id}}"
      data-name="{{defaultOption.name}}">{{defaultOption.name}}
    </text>
    <text class="option"
      wx:for="{{result}}"
      wx:key="{{item.id}}"
      data-id="{{item.id}}"
      data-name="{{item.name}}">{{item.name}}
    </text>
  </view>
</view>

Component({
  properties: {
    options: {
      type: Array,
      value: []
    },
    defaultOption: {
      type: Object,
      value: {
        id: ‘000‘,
        name: ‘全部城市‘
      }
    },
    key: {
      type: String,
      value: ‘id‘
    },
    text: {
      type: String,
      value: ‘name‘
    }
  },
  data: {
    result: [],
    isShow: false,
    current: {}
  },
  methods: {
    optionTap(e) {
      let dataset = e.target.dataset
      this.setData({
        current: dataset,
        isShow: false
      });

      // 调用父组件方法，并传参
      this.triggerEvent("change", { ...dataset })
    },
    openClose() {
      this.setData({
        isShow: !this.data.isShow
      })
    },

    // 此方法供父组件调用
    close() {
      this.setData({
        isShow: false
      })
    }
  },
  lifetimes: {
    attached() {
      // 属性名称转换, 如果不是 { id: ‘‘, name:‘‘ } 格式，则转为 { id: ‘‘, name:‘‘ } 格式
      let result = []
      if (this.data.key !== ‘id‘ || this.data.text !== ‘name‘) {       
        for (let item of this.data.options) {
          let { [this.data.key]: id, [this.data.text]: name } = item
          result.push({ id, name })
        }
      }
      this.setData({
        current: Object.assign({}, this.data.defaultOption),
        result: result
      })
    }
  }
})

[{
      city_id: ‘001‘,
      city_name: ‘北京‘
    }, {
      city_id: ‘002‘,
      city_name: ‘上海‘
    }, {
      city_id: ‘003‘,
      city_name: ‘深圳‘
 }]

[{
      id: ‘001‘,
      name: ‘北京‘
    }, {
      id: ‘002‘,
      name: ‘上海‘
    }, {
      id: ‘003‘,
      name: ‘深圳‘
}]

{
  "component": true,
  "usingComponents": {}
}

.select-box {
  position: relative;
  width: 100%;
  font-size: 30rpx;
}

.select-current {
  position: relative;
  width: 100%;
  padding: 0 10rpx;
  line-height: 70rpx;
  border: 1rpx solid #ddd;
  border-radius: 6rpx;
  box-sizing: border-box;
}

.select-current::after {
  position: absolute;
  display: block;
  right: 16rpx;
  top: 30rpx;
  content: ‘‘;
  width: 0;
  height: 0;
  border: 10rpx solid transparent;
  border-top: 10rpx solid #999;
}

.current-name {
  display: block;
  width: 85%;
  height: 100%;
  word-wrap: normal;
  overflow: hidden;
}

.option-list {
  position: absolute;
  left: 0;
  top: 76rpx;
  width: 100%;
  padding: 12rpx 20rpx 10rpx 20rpx;
  border-radius: 6rpx;
  box-sizing: border-box;
  z-index: 99;
  box-shadow: 0rpx 0rpx 1rpx 1rpx rgba(0, 0, 0, 0.2) inset;
  background-color: #fff;
}

.option {
  display: block;
  width: 100%;
  line-height: 70rpx;
  border-bottom: 1rpx solid #eee;
}

.option:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

<view class="container" bindtap="close">
  <view class="select-wrap">
    <select id="select" options="{{options}}" key="city_id" text="city_name" bind:change="change"></select>
  </view>
</view>