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Today I will share with you a case: how to fix the navigation bar in the page. It has certain reference value and I hope it will be helpful to everyone's learning.
In addition to using the familiar html and CSS for layout when making the navigation bar, we also need to use the scrollTop and scrollLeft knowledge in jQuery. They are mainly used to set or get the position of the vertical scroll bar. According to the page being The height of the curl is used to fix the position of the navigation bar. I will share it with you in detail in the article.
scrollTop
Returns or sets the vertical position of the scroll bar of the matching element.
$(selector).scrollTop(offset)
offset: Specifies the offset relative to the top of the scroll bar, in pixels, you can write or not write
Example: Get the height of the page being curled
$(window).scrollTop();
scrollLeft
Returns or sets the horizontal position of the scroll bar of the matching element.
The horizontal position refers to the number of pixels scrolled from its left side.
When the scroll bar is at the far left, the position is 0.
$(selector).scrollLeft(position)
position: Specifies the new position in pixels, you can write or not write
The horizontal position of the scroll bar refers to the number of pixels scrolled from its left side. When the scroll bar is at the far left, the position is 0.
Example: Get the width of the page being curled
$(window).scrollLeft();
Case sharing: Fixed Baidu search bar
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
*{
padding:0;
margin:0;
}
.all{
width:100%;
height:2000px;
}
.box{
width:100%;
height:75px;
background-color: #fff;
border: 1px solid #ccc;
position: relative;
}
.sousu-left img{
position: absolute;
top:20.5%;
left:28.45%;
}
.box1{width:536px;
height: 41px;
border:1px solid #ccc;
margin:16px auto;
}
.sousu-right span{
width:140px;
height:41px;
border:1px solid #ccc;
color:#fff;
background-color:rgb(51,136,255);
text-align: center;
line-height: 41px;
font-size:14px;
position: absolute;
right:28.64%;
top:19.69%;
}
.fixed{
position: fixed;
left:0;
top:0;
}
</style>
</head>
<body>
<div>
<div>
<!-- 定义左边和右边两个盒子 -->
<div>
<img src="images/logo_top_86d58ae1.png">
<div></div>
</div>
<div>
<span>百度一下</span>
</div>
</div>
</div>
<script src="jquery/jquery-1.12.4.js"></script>
<script>
$(function(){
$(window).scroll(function(){
if($(window).scrollTop()>=$(".box").height())判断当卷曲的高度大于box高度时给box添加一个fixed属性，使它固定在顶部
{
$(".box").addClass("fixed");
}
else{
$(".box").removeClass("fixed");如果小于则移除class属性
}
})
})
</script>
</body>
</html>
Summary: The above is the entire content of this article. I hope that through this case everyone will have a clearer understanding of the application of scrollTop and scrollLeft
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