本文实例为大家分享了微信小程序实现简单吸顶效果的具体代码,供大家参考,具体内容如下
需求:进入页面后首先看到banner布局,然后是tab切换栏以及页面内容,当页面滚动到一定距离后,tab切换栏始终固定在顶部
wxml部分代码如下:
<!--pages/test/test.wxml--> <view style="padding-bottom:30rpx;position:fixed;top:0;width:100%;background:#2ea7e0;"> <view class="wehx-top_input weui-flex"> <!-- 搜索框 --> <view class="weui-flex__item"> <view class="wehx-search__form"> <view class="wehx-search__box"> <icon class="weui-icon-search_in-box" type="search" size="17" color="#0C98C5"></icon> <input type="text" class="wehx-search__input" placeholder-class="wehx-input_placeholder" placeholder="关键字搜索,空格隔开" confirm-type="search" bindconfirm="search" value="{{search}}" /> <view class="weui-icon-clear" wx:if="{{search}}" bindtap="clearSearch"> <icon type="clear" size="14" color="#2ea7e0"></icon> </view> </view> </view> </view> <view bindtap='toSend' style="display:flex;flex-direction:column;justify-content:space-between;align-items:center;padding:0 20rpx;color:#ffffff;"> <text class="iconfont icon-fabu-copy" style="font-size:40rpx;line-height:40rpx;"></text> <view style="color:#ffffff;font-size:20rpx;padding-top:6rpx;">发单</view> </view> </view> </view> <!-- 用于吸顶后 占位用的 --> <view style="height:92rpx;width:100%;"></view> <view style="width: 90%; height: 300rpx; background: red; margin: 30rpx auto;"></view> <view class="navbar-wrap"> <view class="column {{isFixedTop?'fixed':''}}" id="navbar"> <view class="block active">新品推荐</view> <view class="block">限时优惠</view> <view class="block">火爆热搜</view> <view class="block">猜你喜欢</view> </view> </view> <block wx:for="{{20}}" wx:key="list"> <view style="width: 100%; height: 120rpx; background: #f0f0f0; margin: 20rpx auto;"></view> </block>
wxss部分代码如下:
/* pages/test/test.wxss */ view, text { box-sizing: border-box; -moz-box-sizing: border-box; -webkit-box-sizing: border-box; } .navbar-wrap { width: 100%; } .navbar-wrap .column { width: 100%; height: 82rpx; display: flex; flex-direction: row; align-items: center; justify-content: space-around; background: #fff; border-bottom: solid 1px #eee; /* top: 0; */ left: 0; z-index: 100; } .navbar-wrap .column.fixed { position: fixed; top: 92rpx; } /* 以下的代码不重要 */ .navbar-wrap .column .block { width: 25%; height: 80rpx; line-height: 80rpx; text-align: center; font-size: 30rpx; color: #333; letter-spacing: 1px; position: relative; } .navbar-wrap .column .block::after { content: ""; width: 60%; height: 3px; border-radius: 2px; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); background: transparent; } .navbar-wrap .column .block.active { color: #1490ce; font-weight: bold; } .navbar-wrap .column .block.active::after { background: linear-gradient(160deg, rgba(8, 220, 230, 0.7) 10%, rgba(0, 140, 255, 0.7) 90%); } /* 顶部栏目布局 */ .wehx-search__form { overflow: hidden; background: #fff; border-radius: 30rpx; } .wehx-top_input { height: 62rpx; padding-left: 20rpx; background: #2ea7e0; } .wehx-search__box { position: relative; padding-left: 68rpx; } .wehx-search__input { height: 62rpx; font-size: 28rpx; border-radius: 32.5rpx; margin-right: 50px; }
js部分代码如下:
Page({ data: { navbarInitTop: 0, //导航栏初始化距顶部的距离 isFixedTop: false, //是否固定顶部 }, /** * 生命周期函数--监听页面加载 */ onLoad: function (options) { }, /** * 生命周期函数--监听页面显示 */ onShow: function () { var that = this; if (that.data.navbarInitTop == 0) { console.log(that.data.navbarInitTop) //获取节点距离顶部的距离 wx.createSelectorQuery().select('#navbar').boundingClientRect(function (rect) { if (rect && rect.top > 0) { console.log(rect.top - 92) //92是页面搜索框一栏整体的高度 若无搜索栏一项时可以不加此项目 var navbarInitTop = parseInt(rect.top - 92); that.setData({ navbarInitTop: navbarInitTop }); } }).exec(); } }, /** * 监听页面滑动事件 */ onPageScroll: function (e) { var that = this; var scrollTop = parseInt(e.scrollTop); //滚动条距离顶部高度 // console.log(e.scrollTop) //滚动149rpx //滚动条距离顶部高度 //判断'滚动条'滚动的距离 和 '元素在初始时'距顶部的距离进行判断 var isSatisfy = scrollTop >= (that.data.navbarInitTop) ? true : false; //为了防止不停的setData, 这儿做了一个等式判断。 只有处于吸顶的临界值才会不相等 if (that.data.isFixedTop === isSatisfy) { return false; } that.setData({ isFixedTop: isSatisfy }); } })
json部分代码如下:
{ "navigationBarTitleText": "测试", "usingComponents": {} }
最终效果:
未吸顶:
吸顶后:
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持阿兔在线工具。