微信小程序下拉框

微信小程序组件里没有下拉框，正好要用到，记下来以后参考

wxml代码

<view class='top'><view class='top-text'> 选择接收班级</view><!-- 下拉框 --><view class='top-selected' bindtap='bindShowMsg'><text>{{grade_name}}</text><image src='/images/icon/down.png'></image></view><!-- 下拉需要显示的列表 --><view class="select_box" wx:if="{{select}}"><view wx:for="{{grades}}" wx:key="unique"><view class="select_one" bindtap="mySelect" data-name="{{item}}">{{item}}</view></view></view></view>

wxss代码

/* 顶部 */
.top{width: 100vw;height: 80rpx;padding: 0 20rpx;line-height: 80rpx;font-size: 34rpx;border-bottom: 1px solid #000;
}
.top-text{float: left
}
/* 下拉框 */
.top-selected{width: 50%;display: flex;float: right;align-items: center;justify-content: space-between;border: 1px solid #ccc;padding: 0 10rpx;font-size: 30rpx;
}
/* 下拉内容 */
.select_box {background-color: #fff;padding: 0 20rpx;width: 50%;float: right;position: relative;right: 0;z-index: 1;overflow: hidden;text-align: left;animation: myfirst 0.5s;font-size: 30rpx;
}
.select_one {padding-left: 20rpx;width: 100%;height: 60rpx;position: relative;line-height: 60rpx;border-bottom: 1px solid #ccc;
}
/* 下拉过度效果 */
@keyframes myfirst {from {height: 0rpx;}to {height: 210rpx;}
}
/* 下拉图标 */
.top-selected image{height:50rpx;width:50rpx;position: absolute;right: 0rpx;top: 20rpx;
}

js代码

 /*** 页面的初始数据*/data: {select:false,grade_name:'--请选择--',grades: ['猛犸机器人1班','猛犸机器人2班','口才1班',]},/***  点击下拉框*/bindShowMsg() {this.setData({select: !this.data.select})},
/*** 已选下拉框*/mySelect(e) {console.log(e)var name = e.currentTarget.dataset.namethis.setData({grade_name: name,select: false})},