jquery - 向下滚动网站时降低导航栏高度
问题描述
我有一个用 bootstrap 4 制作的固定导航栏。当我向下滚动页面时,我想降低导航栏的高度。当我尝试向下滚动页面时。高度没有降低。下面是我浏览器的视频链接
我已经尝试过的一些代码
$(document).ready(function() {
$('.nav-button').click(function() {
$('.nav-button').toggleClass('change');
});
$(window).scroll(function() {
var position = $(this).scrollTop();
if (position >= 200) {
$('.nav-menu').addClass('.custom-navbar');
} else {
$('.nav-menu').removeClass('.custom-navbar');
}
});
});
body {
font-family: 'Montserrat', sans-serif;
}
/* Header */
header {
height: 100vh;
background: linear-gradient(rgba(0, 0, 0, .4), rgba(0, 0, 0, .5)), url(images/header-img.jpeg) no-repeat center center/cover;
}
/* Navbar */
.nav-menu {
background: linear-gradient(rgba(0, 0, 0, .3), rgba(0, 0, 0, .5));
padding: 30px;
transition: all .7s;
}
.menu-item {
font-size: 13px;
letter-spacing: 1px;
color: #eee;
transition: color .5s;
}
.menu-item:hover {
color: #70aed2;
}
.line1,
.line2,
.line3 {
width: 23px;
height: 3px;
margin: 5px;
transition: all .4s;
}
.change .line1 {
transform: rotate(-45deg) translate(-5px, 6px);
}
.change .line2 {
opacity: 0;
}
.change .line3 {
transform: rotate(45deg) translate(-5px, -6px);
}
.custom-navbar {
padding: 5px 30px;
background: linear-gradient(rgba(0, 0, 0, .6), rgba(0, 0, 0, .7));
}
/* End of Navbar */
/* Banner */
.banner {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
width: 80%;
}
.banner-heading {
animation: anim 2s;
}
.banner-para {
animation: anim 2s .5s backwards;
}
@keyframes anim {
0% {
transform: translateX(-100px);
opacity: 0;
}
100% {
transform: translateX(0);
opacity: 1;
}
}
/* End of Banner */
/* End of Header */
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<!-- Header -->
<header>
<!-- Navbar -->
<nav class="navbar navbar-expand-lg fixed-top nav-menu">
<a href="#" class="navbar-brand text-light text-uppercase"><span class="h2 font-weight-bold">photo</span><span class="h1">X</span></a>
<button class="navbar-toggler nav-button" type="button" data-toggle="collapse" data-target="#myNavbar">
<div class="bg-light line1"></div>
<div class="bg-light line2"></div>
<div class="bg-light line3"></div>
</button>
<div class="collapse navbar-collapse justify-content-end text-uppercase font-weight-bold" id="myNavbar">
<ul class="navbar-nav">
<li class="nav-item">
<a href="#" class="nav-link m-2 menu-item">Home</a>
</li>
<li class="nav-item">
<a href="#" class="nav-link m-2 menu-item">Mission</a>
</li>
<li class="nav-item">
<a href="#" class="nav-link m-2 menu-item">Collection</a>
</li>
<li class="nav-item">
<a href="#" class="nav-link m-2 menu-item">Gallery</a>
</li>
<li class="nav-item">
<a href="#" class="nav-link m-2 menu-item">Customers</a>
</li>
<li class="nav-item">
<a href="#" class="nav-link m-2 menu-item">Pricing</a>
</li>
<li class="nav-item">
<a href="#" class="nav-link m-2 menu-item">Contact</a>
</li>
</ul>
</div>
</nav>
<!-- End of Navbar -->
<!-- Banner -->
<div class="text-light text-md-right text-center banner">
<h1 class="display-4 banner-heading">Welcome to <span class="text-uppercase">photo</span> <span class="display-3">X</span></h1>
<p class="lead banner-para">Lorem ipsum dolor sit amet consectetur adipisicing.</p>
</div>
<!-- End of Banner -->
</header>
<!-- End of Header -->
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解决方案
当您想使用 addClass 和 removeClass 时,您不应该在类名之前添加一个点,这样可以:
if(position >= 200) {
$('.nav-menu').addClass('custom-navbar');
} else {
$('.nav-menu').removeClass('custom-navbar');
}
检查这个codepen,我认为这几乎是你要找的:
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