英文:
bootstrap 4 - navbar brand logo not change in scroll down
问题
我添加了 Bootstrap 4 并创建了导航栏，它正常工作，但我遇到了一些冲突，我尝试在滚动时更改导航栏的徽标，但它没有正常工作，有人知道如何修复这个问题。
这是我的代码：
<!-- language: lang-css -->
$(function () {
$(window).scroll(function () {
if ($(this).scrollTop() > 1000) {
$('.navbar .navbar-brand img').attr('src','https://via.placeholder.com/150/FF00FF/808080?Text=newLogo');
}
if ($(this).scrollTop() < 1000) {
$('.navbar .navbar-brand img').attr('src','https://via.placeholder.com/150/0000FF/808080?Text=oldLogo');
}
})
});
<!-- language: lang-html -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<header class="main_menu home_menu">
<div class="container">
<div class="row align-items-center">
<div class="col-lg-12">
<nav class="navbar navbar-expand-lg navbar-light">
<a class="navbar-brand"><img src="https://via.placeholder.com/150/0000FF/808080?Text=oldLogo" style="width:50px;"></a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
</nav>
</div>
</div>
</div>
</header>
<section>
<div>占位符</div>
<!-- 其他占位符 -->
</section>
希望这有助于解决你的问题。
英文:
I added bootstrap 4 and I created the navbar, it is working good, but i have some conflict I tried to change when the scroll down change the navbar logo, but its not working correctly, anyone know how to fix that issue.
<br><br>This is my code:
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-css -->
$(function () {
$(window).scroll(function () {
if ($(this).scrollTop() > 1000) {
$('.navbar .navbar-brand img').attr('src','https://via.placeholder.com/150/FF00FF/808080?Text=newLogo');
}
if ($(this).scrollTop() < 1000) {
$('.navbar .navbar-brand img').attr('src','https://via.placeholder.com/150/0000FF/808080?Text=oldLogo');
}
})
});
<!-- language: lang-html -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<header class="main_menu home_menu">
<div class="container">
<div class="row align-items-center">
<div class="col-lg-12">
<nav class="navbar navbar-expand-lg navbar-light">
<a class="navbar-brand" > <img src="https://via.placeholder.com/150/0000FF/808080?Text=oldLogo" style="width:50px;"> </a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button></nav>
</div></div></div></header>
<section>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div> <div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div> <div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
</section>
<!-- end snippet -->
答案1
得分: 1
请查看下面的示例。它正常工作。只是您的图像在滚动时被隐藏，否则您的图像会发生变化。
请注意，出于说明目的，我已经固定了您的navbar标题。
只需为您的导航栏使用navbar navbar-expand-lg navbar-light fixed-top类，它应该按预期工作。
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-js -->
$(function () {
$(window).scroll(function () {
if ($(this).scrollTop() > 1000) {
$('.navbar .navbar-brand img').attr('src','https://via.placeholder.com/150/FF00FF/808080?Text=newLogo');
}
if ($(this).scrollTop() < 1000) {
$('.navbar .navbar-brand img').attr('src','https://via.placeholder.com/150/0000FF/808080?Text=oldLogo');
}
})
});
<!-- language: lang-html -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous"></script>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<header class="main_menu home_menu">
<div class="container">
<div class="row align-items-center">
<div class="col-lg-12">
<nav class="navbar navbar-expand-lg navbar-light fixed-top">
<a class="navbar-brand" > <img src="https://via.placeholder.com/150/0000FF/808080?Text=oldLogo" style="width:50px;"> </a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button></nav>
</div></div></div></header>
<section>
<div>Placeholder</div>
<!-- 这里有很多占位符 -->
</section>
<!-- end snippet -->
注意：上述代码是一个示例，用于说明目的。根据您的实际需求，您可能需要自定义一些部分。
英文:
Check out below fiddle. It is working fine. It is just that your image is getting hidden under scroll otherwise your image is getting changed.
Please note, for illustration purposes, I have fixed your navbar header.
Just use navbar navbar-expand-lg navbar-light fixed-top classes for your navbar and it should work as expected.
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-js -->
$(function () {
$(window).scroll(function () {
if ($(this).scrollTop() > 1000) {
$('.navbar .navbar-brand img').attr('src','https://via.placeholder.com/150/FF00FF/808080?Text=newLogo');
}
if ($(this).scrollTop() < 1000) {
$('.navbar .navbar-brand img').attr('src','https://via.placeholder.com/150/0000FF/808080?Text=oldLogo');
}
})
});
<!-- language: lang-html -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<header class="main_menu home_menu">
<div class="container">
<div class="row align-items-center">
<div class="col-lg-12">
<nav class="navbar navbar-expand-lg navbar-light fixed-top">
<a class="navbar-brand" > <img src="https://via.placeholder.com/150/0000FF/808080?Text=oldLogo" style="width:50px;"> </a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button></nav>
</div></div></div></header>
<section>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
<div>Placeholder</div>
</section>
<!-- end snippet -->
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论