小程序选择框

由于本篇文章收藏人数多，但本篇内容有些小问题，后续使用uniapp重新开发并优化了选择框，具体可参考新文章，链接如下：uniapp下拉框组件_WeiflR10的博客-优快云博客_uniapp下拉框组件

一、选择框基础功能

效果图：

 

 wxml

<view style="position:relative;top:100rpx;">
	<!-- 选中之后的数据展示 -->
	<view class="inputPlaceholder" wx:if='{{value}}' bindtap="changejiantou">
		<text style="color:black;">{{value}}</text>
		<view class="jiantou1" wx:if='{{isjiantou}}'><i class="iconfont icon-jiantou"></i></view>
		<view class="jiantou1" wx:else='{{isjiantou}}'><i class="iconfont icon-jiantou1"></i></view>
	</view>
	<!-- 未选择时的Placeholder展示 -->
	<view class="inputPlaceholder" wx:else bindtap="changejiantou">
		<text>请选择司机类别</text>
		<view class="jiantou1" wx:if='{{isjiantou}}'><i class="iconfont icon-jiantou"></i></view>
		<view class="jiantou1" wx:else='{{isjiantou}}'><i class="iconfont icon-jiantou1"></i></view>
	</view>
	<!-- 下拉展开后的可选择内容 -->
	<view class="content" wx:if='{{!isjiantou}}'>
		<view 
			class="{{item.id==valueid ? 'active':''}}" 
			wx:for="{{selectcontent}}" wx:key="idnex" 
			bindtap="changecontent" 
			data-datavalue="{{item}}">
			{{item.name}}
		</view>
	</view>
</view>

wxss

  .inputPlaceholder{
    width: 360rpx;
    height: 45rpx;
    border: 1px solid #DEDEDE;
    padding: 8rpx 40rpx 8rpx 20rpx;
    margin-left: 16rpx;
    color: #CBCBCB;
    border-radius: 10rpx;
    position: relative;
    overflow:hidden;
    text-overflow: ellipsis;
    white-space:nowrap;
  }
  .jiantou1{
    position: absolute;
    right: 10rpx;
    top: 8rpx;
  }
  .content{
    width: 384rpx;
    max-height: 400rpx;
    position: absolute;
    top: 62rpx;
    left: 16rpx;
    background: #FFFFFF;
    box-shadow: 0px 0px 10px 1px rgba(209, 209, 209, 0.35);
    padding: 20rpx;
    overflow-x: hidden;
    overflow-y: scroll;
  }
  .content>view{
    padding: 10rpx 0;
  }
  .active{
    color: #56D88A;
  }

js

Page({
  data: { 
    isjiantou:true,   //箭头切换
    selectcontent:[
      {id:1,name:"标准司机标准司机标准司机"},
      {id:2,name:"危运司机"},
      {id:3,name:"标准司机"},
      {id:4,name:"危运司机"},
      {id:5,name:"标准司机2"},
      {id:6,name:"危运司机"},
      {id:7,name:"标准司机"},
      {id:8,name:"危运司机"},
      {id:9,name:"标准司机"},
      {id:10,name:"危运司机"}
    ],
    value:undefined,   //选中的值
    valueid:undefined,  //选中的id
  },
    // 下拉框收起和下拉
    changejiantou(){
      this.setData({
        isjiantou:!this.data.isjiantou
      })
    },
    // 选择数据后回显
    changecontent(e){
      this.setData({
        value:e.currentTarget.dataset.datavalue.name,
        valueid:e.currentTarget.dataset.datavalue.id,
        isjiantou:true
      })
    }
  })

二、选择框搜索+选择

效果图：

 

 wxml

<view style="position:relative;top:100rpx;">
	<!-- 选中之后的数据展示 -->
	<view class="inputPlaceholder" wx:if='{{value}}' bindtap="changejiantou">
		<input placeholder="请选择" bindinput="search" value="{{inputVal}}"></input>
		<view class="jiantou1" wx:if='{{isjiantou}}'><i class="iconfont icon-jiantou"></i></view>
		<view class="jiantou1" wx:else='{{isjiantou}}'><i class="iconfont icon-jiantou1"></i></view>
	</view>
	<!-- 未选择时的Placeholder展示 -->
	<view class="inputPlaceholder" wx:else bindtap="changejiantou">
		<input placeholder="请选择" bindinput="search" value="{{inputVal}}"></input>
		<view class="jiantou1" wx:if='{{isjiantou}}'><i class="iconfont icon-jiantou"></i></view>
		<view class="jiantou1" wx:else='{{isjiantou}}'><i class="iconfont icon-jiantou1"></i></view>
	</view>
	<!-- 下拉展开后的可选择内容 -->
	<view class="content" wx:if='{{!isjiantou}}'>
		<view 
			class="{{item.id==valueid ? 'active':''}}" 
			wx:for="{{selectcontent}}" wx:key="idnex" 
			bindtap="changecontent" 
			data-datavalue="{{item}}">
			{{item.name}}
		</view>
	</view>
</view>

wxss

.inputPlaceholder{
    width: 360rpx;
    height: 45rpx;
    border: 1px solid #DEDEDE;
    padding: 8rpx 40rpx 8rpx 20rpx;
    margin-left: 16rpx;
    border-radius: 10rpx;
    position: relative;
    overflow:hidden;
    text-overflow: ellipsis;
    white-space:nowrap;
  }
  .jiantou1{
    position: absolute;
    right: 10rpx;
    top: 8rpx;
    color: #CBCBCB;
  }
  .content{
    width: 384rpx;
    max-height: 400rpx;
    position: absolute;
    top: 62rpx;
    left: 16rpx;
    background: #FFFFFF;
    box-shadow: 0px 0px 10px 1px rgba(209, 209, 209, 0.35);
    padding: 20rpx;
    overflow-x: hidden;
    overflow-y: scroll;
  }
  .content>view{
    padding: 10rpx 0;
  }
  .active{
    color: #56D88A;
  }

js

    onLoad: function () {
      this.setData({
        selectcontents:this.data.selectcontent
      })
    },
    // 下拉框收起和下拉
    changejiantou(e){
      this.setData({
        isjiantou:!this.data.isjiantou,
        inputVal:this.data.value
      })
    },
    // 选择数据后回显
    changecontent(e){
      this.setData({
        value:e.currentTarget.dataset.datavalue.name,
        valueid:e.currentTarget.dataset.datavalue.id,
        isjiantou:true
      })
      // 每次输入的值都应该等于搜索后选中的值
      this.setData({
        inputVal:this.data.value
      })
    },
    // 搜索功能
    search(e){
      var val = e.detail.value
      var arr = [];
      for (var i = 0; i < this.data.selectcontents.length; i++) {
        if (this.data.selectcontents[i].name.indexOf(val) >= 0) {
          arr.push(this.data.selectcontents[i]);
        }
      }
      this.setData({
        selectcontent: arr
      })
    }