微信小程序下拉选择框—相当于网页的select

Posted 2022-07-29 肉丸不肉

index.html

<view class='select_box'>
    <view class='select' catchtap='selectTap'>
        <text class='select_text'>selectData[index]</text>
        <image class='select_img show&&"select_img_rotate"' src=''></image>         
    </view>
    <view class='option_box' style='height:show?(selectData.length>5?300:selectData.length*60):0rpx;'>
        <text class='option' style='index==selectData.length-1&&"border:0;"' wx:for='selectData' wx:key='this' data-index='index' catchtap='optionTap'>item</text>
    </view>
</view>

index.wxss

page
  background: #f3f7f7;

.select_box
  background: #fff;
  width: 80%;
  margin: 30rpx auto;
  position: relative;

.select
  box-sizing: border-box;
  width: 100%;
  height: 70rpx;
  border:1px solid #efefef;
  border-radius: 8rpx;
  display: flex;
  align-items: center;
  padding: 0 20rpx;

.select_text
  font-size: 30rpx;
  flex: 1;

.select_img
  width: 40rpx;
  height: 40rpx;
  display: block;
  transition:transform 0.3s;

.select_img_rotate
  transform:rotate(180deg); 

.option_box
  position: absolute;
  top: 70rpx;
  width: 100%;
  border:1px solid #efefef;
  box-sizing: border-box;
  height: 0;
  overflow-y: auto;
  border-top: 0;
  background: #fff;
  transition: height 0.3s;

.option
  display: block;
  line-height: 40rpx;
  font-size: 30rpx;
  border-bottom: 1px solid #efefef;
  padding: 10rpx;

index.js

Page(

  data: 
    show: false,//控制下拉列表的显示隐藏，false隐藏、true显示
    selectData: ['1', '2', '3', '4', '5', '6'],//下拉列表的数据
    index: 0//选择的下拉列表下标
  ,
  // 点击下拉显示框
  selectTap() 
    this.setData(
      show: !this.data.show
    );
  ,
  // 点击下拉列表
  optionTap(e) 
    let Index = e.currentTarget.dataset.index;//获取点击的下拉列表的下标
    this.setData(
      index: Index,
      show: !this.data.show
    );
  ,
  onLoad: function (options) 

  

)