微信小程序--自定义下拉列表

custom-drop-down/index.wxml

<!--pages/component/custom-drop-down/index.wxml-->
<view style="position: relative; display: flex; flex-direction: column;">
    <view style="display:flex; align-items: center; border:black 1px solid" bindtap="clickShow">
      <view class="dropdown-value">{
         
  {provinceValue}}</view>
      <image src="./../../../images/arrow-down.png" class="dropdown-image"></image>
    </view>
    <view style="height: 100px; border:darkgray 1px solid" wx:if="{
         
  {show}}">
      <scroll-view style="height: 100px;" scroll-y="ture">
        <view wx:for="{
         
  {option2}}" wx:key="value" bindtap="selectIndex" data-index="{
         
  {index}}" class="dropdown-item">
          {
         
  {item.text}}<image src="./../../../images/duihao.png" class="dropdown-item-img" wx:if="{
         
  {item.selected}}"></image>
        </view>
      </scroll-view>

    </view>
  </view>

custom-drop-down/index.wxss

/* pages/component/custom-drop-down/index.wxss */
.dropdown-item {
  margin: 10px 10px;
}
.dropdown-item-img {
  float: right;
  right: 15px;
  width: 16px; height: 16px;
}
.dropdown-image {
  width: 16px; height: 16px;
}
.dropdown-value {
  flex: 1;padding-left: 5px;
}

custom-drop-down/index.js

// pages/component/custom-drop-down/index.js
Component({
  /**
   * 组件的属性列表
   */
  properties: {
    option2: {
      type: Array,
      value: [
        { text: 默认排序, value: a },
        { text: 好评排序, value: b },
        { text: 销量排序, value: c },
      ]
    },
    show: {
      type:Boolean,
      value:false
    }
  },

  /**
   * 组件的初始数据
   */
  data: {
    provinceValue:排序
  },

  /**
   * 组件的方法列表
   */
  methods: {
    clickShow: function() {
      this.setData({
        show:!this.data.show
      })
    },
    selectIndex: function(option) {
      console.log(selectIndex,option);
      let index = option.currentTarget.dataset.index;
      console.log(selectIndex====,this.data.option2[index].text);
      for(let i=0;i<this.data.option2.length;i++) {
        let item = this.data.option2[i];
        if(i == index) {
          item.selected = true;
        } else {
          item.selected = false;
        }
      }
      this.setData({
        provinceValue:this.data.option2[index].text,
        option2:this.data.option2,
        show:false
      })
    }
  }
})

custom-drop-down/index.json

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

调用：

<custom-dropdown option2="{
         
  {option2}}"></custom-dropdown>