我background-color
在滚动页面时无法更改固定的顶部导航栏。
这是JS中的函数:
$(document).ready(function(){
var scroll_start = 0;
var startchange = $('#startchange');
var offset = startchange.offset();
if (startchange.length){
$(document).scroll(function() {
scroll_start = $(this).scrollTop();
if(scroll_start > offset.top) {
$(".navbar").css('background-color', '#f0f0f0');
} else {
$('.navbar').css('background-color', 'transparent');
}
});
}
});
这是一个名为“ custom.js
”的文件,加载后位于页面底部bootstrap and jquery
(custom.js
与处于同一文件夹中index.html
)
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="custom.js"></script>
这是html导航栏:
<div class="container">
<nav class="navbar navbar-default navbar-fixed-top">
<div class="container-fluid">
<div class="navbar-header ">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbarNav">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<div id="navbarNav" class="navbar-collapse collapse ">
<br/><br/>
<ul class="nav navbar-nav navbar-right ">
<li><a href="#">ABOUT</a></li>
<li><a href="#">SERVICES</a></li>
<li><a href="#">CONTACT</a></li>
<li><a href="#">CALCULATORS</a></li>
</ul>
</div>
</div>
</nav>
</div>
然后只有导航栏背景颜色更改的CSS:
.navbar {
background-color: transparent;
border-color: transparent;
}
.navbar-toggle:hover, .navbar-default .navbar-toggle:focus{
background-color: transparent !important;
}
这是您当前的函数和CSS在带有的页面上执行<div>
的操作id=startchange
。在页面加载时,导航栏不是透明的。滚动后,导航栏将立即变为透明(边框仍可见),一旦<div>
withid=startchange
通过页面顶部,导航栏将再次变为非透明。
如果使CSS更具体,则可以使导航栏透明,以无边框开头(在较大的屏幕尺寸下,您可能还想看看其在较小屏幕上的样式)。
$(document).ready(function(){
var scroll_start = 0;
var startchange = $('#startchange');
var offset = startchange.offset();
if (startchange.length){
$(document).scroll(function() {
scroll_start = $(document).scrollTop();
if(scroll_start > offset.top) {
$(".navbar").css('background-color', '#f0f0f0');
} else {
$('.navbar').css('background-color', 'transparent');
}
});
}
});
.navbar.navbar-default.navbar-fixed-top {
background-color: transparent;
border-color: transparent;
-webkit-transition: background-color 2s; /* Safari */
transition: background-color 2s;
}
.navbar-toggle:hover, .navbar-default .navbar-toggle:focus{
background-color: transparent !important;
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<div class="container">
<nav class="navbar navbar-default navbar-fixed-top">
<div class="container-fluid">
<div class="navbar-header ">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbarNav">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<div id="navbarNav" class="navbar-collapse collapse ">
<br/><br/>
<ul class="nav navbar-nav navbar-right ">
<li><a href="#">ABOUT</a></li>
<li><a href="#">SERVICES</a></li>
<li><a href="#">CONTACT</a></li>
<li><a href="#">CALCULATORS</a></li>
</ul>
</div>
</div>
</nav>
<div id="page">
Page Top
<br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
<div id="startchange">Start Change Div</div>
<br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
Page Bottom
</div>
</div>
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