微信小程序自定义可搜索的picker组件示例详解

<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="请输入学校名称关键词"
          bind:change="searchSchool"
        />
        <view bindtap='confirm'>确定</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: {
    // 在组件定义时的选项中启用多slot支持
    multipleSlots: true
  },
  /**
   * 组件的属性列表
   */
  properties: {
    // 初始化日期
    initValue: {
      type: String,
      value: ''
    },
    // 父组件传递过来的数据列表
    items: {
      type: Array,
      value: []
    }
  },
  /**
   * 组件的初始数据
   */
  data: {
    //控制picker的显示与隐藏
    flag: true,
    // 用户输入的学校关键词
    searchValue:'',
    // 滚动选择的学校
    setValues: [],
    // 滚动选择的学校索引
    selectSchoolIndex:''
  },
  /**
   * 组件的方法列表
   */
  methods: {
  /**
  * @name: 搜索学校
  * @author: camellia
  * @date: 20211129
  */
  searchSchool(e)
  {
    let self = this;
    self.triggerEvent('searchSchool', e.detail);
  },
  /**
  * @name: 隐藏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: 选择好学校后，点击确定
  * @author: camellia
  * @date: 20211129
  */
  confirm()
  {
    let self = this;
    // 获取用户选择的学校
    let item = self.data.items[self.data.selectSchoolIndex]?self.data.items[self.data.selectSchoolIndex]:self.data.items[0];
    // 通过发送自定义事件把用户选择的学校传递到父组件
    self.triggerEvent('confirm', item);
  },
  /**
  * @name: 用户滚动picker时，获取滚动选择的索引
  * @author: camellia
  * @date: 20211129
  */
  bindChange(e)
  {
    let self = this;
    self.setData({
      // 用户选择的学校索引
      selectSchoolIndex:e.detail.value[0]
    })
  },
  /**
   * @name: 获取初始化信息
   * @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"
  }
}

            <!-- 填写学校 -->
            <view class="Info_Item Item_School">
                <view class="School FLOAT_LEFT" >学校 /University : </view>
                <view class="require FLOAT_RIGHT">*</view>
                <!-- 学校输入框 -->
                <view class="FLOAT_RIGHT">
                    <view  class="School_Input"  style="{{school_id?'':'color:#808080'}};{{schoolValidate?'border:1rpx solid #BD3731':''}}" bindtap="showSchoolPicker">{{school_name}}
                    </view>
                    <!-- 学校输入框右侧三角按钮 -->
                        <view class="schoolDrop_icon" >
                            <van-image width="22rpx" height="16rpx" src="/images/expand.png" ></van-image>
                        </view>
                </view>
            </view>

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    let self = this;
    // 获取自定义学校picker实例
    self.demopicker = self.selectComponent("#demopicker");
  },
/**
   * @name: 点击学校输入框,展示选择学校picker
   * @author: camellia
   * @date: 20211129
   */
  showSchoolPicker()
  {
    let self = this;
    self.demopicker.showDatePicker()
  },
  /**
   * @name: 点击picker确定按钮,隐藏选择学校picker
   * @author: camellia
   * @param:e:自定义组件传递的参数，该参数里保存了用户选择的学校id和name
   * @date: 20211129
   */
  confirmSchool(e){
    let self = this;
    // 隐藏自定义picker
    self.demopicker.hiddeDatePicker();
  },