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：
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;
left: 0;
z-index: 100;
}
.navbar-wrap .column.fixed {
position: fixed;
top: 92rpx;
}
.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%);
}
.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
},
onLoad: function (options) {
},
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();
}
},
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编程网。
