微信小程式自定義可搜尋的picker元件範例詳解

<view class="date-background" hidden="{{flag}}">
  <view class='date-gray-background' bindtap='hiddeDatePicker'></view>
  <view class='date-container'>
    <view class="transparent">
      <view class='date-confirm'>
        <view bindtap='hiddeDatePicker'>取消</view>
        <van-search
          value="{{searchValue}}"
          input-align="center"
          placeholder="請輸入學校名稱關鍵詞"
          bind:change="searchSchool"
        />
        <view bindtap='confirm'>確定</view>
      </view>
      <picker-view
        indicator-class="indicator"
        value="{{setValues}}"
        bindchange="bindChange"
        bindpickend="_bindpickend"
        indicator-style="height: 100rpx;"
        mask-style="height:900rpx;"
        style="width: 100%; height: 90%;position:absolute;bottom:0rpx;text-align:center;background:white"
      >
 
        <picker-view-column class="pickViewColumn">
          <view wx:for="{{items}}" wx:key="id" style="line-height: 104rpx">{{item.name}}</view>
        </picker-view-column>
      </picker-view>
    </view>
  </view>
</view>

Component({
  options: {
    // 在元件定義時的選項中啟用多slot支援
    multipleSlots: true
  },
  /**
   * 元件的屬性列表
   */
  properties: {
    // 初始化日期
    initValue: {
      type: String,
      value: ''
    },
    // 父元件傳遞過來的資料列表
    items: {
      type: Array,
      value: []
    }
  },
  /**
   * 元件的初始資料
   */
  data: {
    //控制picker的顯示與隱藏
    flag: true,
    // 使用者輸入的學校關鍵詞
    searchValue:'',
    // 捲動選擇的學校
    setValues: [],
    // 捲動選擇的學校索引
    selectSchoolIndex:''
  },
  /**
   * 元件的方法列表
   */
  methods: {
  /**
  * @name: 搜尋學校
  * @author: camellia
  * @date: 20211129
  */
  searchSchool(e)
  {
    let self = this;
    self.triggerEvent('searchSchool', e.detail);
  },
  /**
  * @name: 隱藏picker
  * @author: camellia
  * @date: 20211129
  */
  hiddeDatePicker()
  {
    let self = this;
    self.setData({
      flag: !self.data.flag
    })
  },
  /**
  * @name: 展示picker
  * @author: camellia
  * @date: 20211129
  */
  showDatePicker()
  {
    let self = this;
    self.setData({
      flag: !self.data.flag
    })
    self.getItems()
  },
  /**
  * @name: 選擇好學校後，點選確定
  * @author: camellia
  * @date: 20211129
  */
  confirm()
  {
    let self = this;
    // 獲取使用者選擇的學校
    let item = self.data.items[self.data.selectSchoolIndex]?self.data.items[self.data.selectSchoolIndex]:self.data.items[0];
    // 通過傳送自定義事件把使用者選擇的學校傳遞到父元件
    self.triggerEvent('confirm', item);
  },
  /**
  * @name: 使用者捲動picker時，獲取捲動選擇的索引
  * @author: camellia
  * @date: 20211129
  */
  bindChange(e)
  {
    let self = this;
    self.setData({
      // 使用者選擇的學校索引
      selectSchoolIndex:e.detail.value[0]
    })
  },
  /**
   * @name: 獲取初始化資訊
   * @author: camellia
   * @date: 20211130
   */
  getItems(e)
  {
    let self = this;
    if (self.data.items.length && self.data.initValue) {
      let items = self.data.items
      for (let i = 0; i < items.length; i++) {
        if (self.data.initValue == items[i].id) {
          self.setData({
            setValues: [i]
          })
          return
        }
      }
    }
    self.setData({
      setValues: [0]
    })
  },
},
})

.date-background {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
}
.date-gray-background {
    position: absolute;
    width: 100%;
    top: 0;
    background: rgba(0, 0, 0, .5);
    height: calc(100% - 500rpx);
}
.date-container {
    position: absolute;
    width: 100%;
    height: 900rpx;
    overflow: hidden;
    background: #fff;
    bottom:0;
    z-index: 1000;
}
 
.date-confirm {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding:0 20rpx;
    font-size:34rpx;
    line-height: 70rpx;
    color:var(--ThemeColor)
}
.pickViewColumn{
    height: 900rpx;
    margin-top: -300rpx;
}
.indicator{
  height: 80rpx;
  border: 1rpx solid #E5E8E8;
  }

{
  "component": true,
  "usingComponents": {
      "van-search": "@vant/weapp/search/index"
  }
}

{
  "usingComponents": {
    "myPicker":"/components/myPicker/myPicker"
  }
}

            <!-- 填寫學校 -->
            <view class="Info_Item Item_School">
                <view class="School FLOAT_LEFT" >學校 /University : </view>
                <view class="require FLOAT_RIGHT">*</view>
                <!-- 學校輸入框 -->
                <view class="FLOAT_RIGHT">
                    <view  class="School_Input"  style="{{school_id?'':'color:#808080'}};{{schoolValidate?'border:1rpx solid #BD3731':''}}" bindtap="showSchoolPicker">{{school_name}}
                    </view>
                    <!-- 學校輸入框右側三角按鈕 -->
                        <view class="schoolDrop_icon" >
                            <van-image width="22rpx" height="16rpx" src="/images/expand.png" ></van-image>
                        </view>
                </view>
            </view>

  /**
   * 生命週期函數--監聽頁面載入
   */
  onLoad: function (options) {
    let self = this;
    // 獲取自定義學校picker範例
    self.demopicker = self.selectComponent("#demopicker");
  },
/**
   * @name: 點選學校輸入框,展示選擇學校picker
   * @author: camellia
   * @date: 20211129
   */
  showSchoolPicker()
  {
    let self = this;
    self.demopicker.showDatePicker()
  },
  /**
   * @name: 點選picker確定按鈕,隱藏選擇學校picker
   * @author: camellia
   * @param:e:自定義元件傳遞的引數，該引數裡儲存了使用者選擇的學校id和name
   * @date: 20211129
   */
  confirmSchool(e){
    let self = this;
    // 隱藏自定義picker
    self.demopicker.hiddeDatePicker();
  },