Bootstrap 4:页脚不在底部 [英] Bootstrap 4: Footer not at bottom
本文介绍了Bootstrap 4:页脚不在底部的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我知道这个问题可能被问了数百遍，但是遗憾的是，我在这里找不到的答案确实对我有帮助.
例如，我尝试了以下答案:
但是我仍然有一个问题，当页面内容变小"并且没有填满正文/页面容器的整个高度时，页脚仅会浮在浏览器窗口末尾的某个位置.
这是我的页脚代码:
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/css/bootstrap.min.css" integrity="sha384-Smlep5jCw/wG7hdkwQ/Z5nLIefveQRIY9nfy6xoR1uRYBtpZgI6339F5dgvm/e9B" crossorigin="anonymous">
<footer class="d-flex justify-content-center">
<div class="d-flex justify-content-between col-md-8 col-md-offset-2 mb-3 mt-5">
<div class="align-left">
<a class="font-weight-bold small kf-blue kf-links" href="#">Link1</a> |
<a class="font-weight-bold small kf-blue kf-links" href="/">Link2</a> |
<a class="font-weight-bold small kf-blue kf-links" href="/">Link3</a>
</div>
<div class="align-right small">
Crafted with Love by <a class="font-weight-bold kf-blue kf-links" href="#" target="_blank">Me</a>
</div>
</div>
</footer>
我正在使用Bootstrap 4.1和Chrome，这也是我网站上的一个代码笔:
https://codepen.io/anon/pen/oMZVxq
注意:您必须使用Codepen中的侧边栏视图才能实际看到页脚不在底部，因为Codepen中的视图尺寸太小以至于看起来正确.
解决方案
您可以使用内置的引导程序类来实现此目的.
您需要的是将容器变成列flex容器.使用的类是:d-flex flex-column
要将容器设置为高度:100％，您可以将类h-100应用于html，body和容器，或者添加为容器样式height:100vh;
对于页脚，将使用margin-top:auto，要使用的类为:mt-auto;
下面的示例以全页模式运行
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.5.0/css/bootstrap.min.css" rel="stylesheet"/>
<html class="h-100">
<body class="h-100">
<!-- Page Container -->
<div id="page-container" class="container-fluid pr-0 pl-0 h-100 d-flex flex-column">
<!-- Header -->
<nav class="navbar navbar-expand-lg navbar-light bg-light pt-3 pb-3 d-flex justify-content-center">
<div class="col-md-8 col-lg-8 col-sm-12 col-xs-12 d-flex justify-content-between">
<div class="d-flex justify-content-start align-items-center">
<a href="/" class="kf-links">
<span class="h5">
<i class="fas fa-paper-plane"></i>
<span class="h4 font-weight-bold kf-dark">
MyPage
</span>
</span>
</a>
</div>
<!-- Main Header Navigation -->
<div class="collapse navbar-collapse justify-content-end" id="navbarSupportedContent">
<ul class="navbar-nav">
<li class="nav-item">
<a href="/" class="nav-link ">Link1</a>
</li>
<li class="nav-item">
<a href="" class="nav-link ">Link2</a>
</li>
<li class="nav-item">
<a href="" class="nav-link ">Link3</a>
</li>
</ul>
</div>
<!-- END Main Header Navigation -->
</div>
</nav>
<!-- END Header -->
<!-- Main Container -->
<div style="background:#5c90d2">
<div class="col-md-12 text-center pt-5 pb-5">
<div class="pt-5 pb-5">
<h1>
<span class="main-text">
Login
</span>
</h1>
<p class="lead"><span class="main-text">
Login Now!
</span></p>
</div>
</div>
</div>
<!-- Content -->
<div class="d-flex justify-content-center fadeIn">
<div class="col-md-8 col-xs-12">
<div class="d-flex justify-content-center">
<div class="col-md-6 pt-5 pb-5 pr-0 pl-0">
<form class="form-horizontal" method="post">
<div class="form-group">
<div class="col-xs-12">
<div class="">
<label for="id_username">E-Mail</label>
<input id="id_username" class="form-control" maxlength="254" name="username" value="" type="text" required>
</div>
</div>
</div>
<div class="form-group">
<div class="col-xs-12">
<div class="">
<label for="id_password">Password</label>
<input id="id_password" class="form-control" name="password" type="password" required>
</div>
</div>
</div>
<div class="form-group">
<div class="col-xs-12">
<small class="float-right">
<a href="#" class="kf-links">Forgot Password?</a>
</small>
</div>
</div>
<div class="form-group mt-5">
<div class="col-xs-12 col-sm-6 col-sm-offset-3 col-md-4 col-md-offset-4 pl-0">
<button class="btn btn-sm btn-block btn-primary" type="submit">Login</button>
</div>
</div>
</form>
</div>
</div>
</div>
</div>
<!-- END Content -->
<!-- END Main Container -->
<!-- Footer -->
<footer class="d-flex justify-content-center mt-auto">
<div class="d-flex justify-content-between col-md-8 col-md-offset-2 mb-3 mt-5">
<!-- Copyright Info -->
<div class="align-left">
<a class="font-weight-bold small kf-blue kf-links" href="#">Link1</a> |
<a class="font-weight-bold small kf-blue kf-links" href="/">Link2</a> |
<a class="font-weight-bold small kf-blue kf-links" href="/">Link3</a>
</div>
<div class="align-right small">
Crafted with Love by <a class="font-weight-bold kf-blue kf-links" href="#" target="_blank">Me</a>
</div>
<!-- END Copyright Info -->
</div>
</footer>
<!-- END Footer -->
</div>
<!-- END Page Container -->
</body>
</html>
codepen更新了 https://codepen.io/anon/pen/PBpgNN
boostrap类的提醒 https://getbootstrap.com/docs/4.5/utilities/flex/有关调整大小的信息，请参见 https://getbootstrap.com/docs/4.5/实用程序/大小/
I know this question was probably asked some hundred times, but sadly no answer that I found in here really helped me.
I tried these answers for example:
- Bootstrap footer not at bottom
- Flushing footer to bottom of the page, twitter bootstrap
- Height not 100% on Container Fluid even though html and body are
But I still have the problem that when my page content is to "small" and doesn't fill out the whole height of the body/page container the footer just floats somewhere above the end of the browser window.
This is the code for my footer:
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/css/bootstrap.min.css" integrity="sha384-Smlep5jCw/wG7hdkwQ/Z5nLIefveQRIY9nfy6xoR1uRYBtpZgI6339F5dgvm/e9B" crossorigin="anonymous">
<footer class="d-flex justify-content-center">
<div class="d-flex justify-content-between col-md-8 col-md-offset-2 mb-3 mt-5">
<div class="align-left">
<a class="font-weight-bold small kf-blue kf-links" href="#">Link1</a> |
<a class="font-weight-bold small kf-blue kf-links" href="/">Link2</a> |
<a class="font-weight-bold small kf-blue kf-links" href="/">Link3</a>
</div>
<div class="align-right small">
Crafted with Love by <a class="font-weight-bold kf-blue kf-links" href="#" target="_blank">Me</a>
</div>
</div>
</footer>
I'm using Bootstrap 4.1 and Chrome, here's also a codepen to my site:
https://codepen.io/anon/pen/oMZVxq
Note: you have to use the sidebar view in codepen to actually see that the footer is not at the bottom, as the view size in codepen is so small that it looks correctly.
解决方案
You can use built-in bootstrap class to achieve this.
What you need is the container to be a column flex container . class to use are : d-flex flex-column
To set the container to height:100% you can apply the class h-100to html, body and the container or add to the container style height:100vh;
For the footer, a margin-top:auto will do, the class to use is : mt-auto;
example below to run in full page mode
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.5.0/css/bootstrap.min.css" rel="stylesheet"/>
<html class="h-100">
<body class="h-100">
<!-- Page Container -->
<div id="page-container" class="container-fluid pr-0 pl-0 h-100 d-flex flex-column">
<!-- Header -->
<nav class="navbar navbar-expand-lg navbar-light bg-light pt-3 pb-3 d-flex justify-content-center">
<div class="col-md-8 col-lg-8 col-sm-12 col-xs-12 d-flex justify-content-between">
<div class="d-flex justify-content-start align-items-center">
<a href="/" class="kf-links">
<span class="h5">
<i class="fas fa-paper-plane"></i>
<span class="h4 font-weight-bold kf-dark">
MyPage
</span>
</span>
</a>
</div>
<!-- Main Header Navigation -->
<div class="collapse navbar-collapse justify-content-end" id="navbarSupportedContent">
<ul class="navbar-nav">
<li class="nav-item">
<a href="/" class="nav-link ">Link1</a>
</li>
<li class="nav-item">
<a href="" class="nav-link ">Link2</a>
</li>
<li class="nav-item">
<a href="" class="nav-link ">Link3</a>
</li>
</ul>
</div>
<!-- END Main Header Navigation -->
</div>
</nav>
<!-- END Header -->
<!-- Main Container -->
<div style="background:#5c90d2">
<div class="col-md-12 text-center pt-5 pb-5">
<div class="pt-5 pb-5">
<h1>
<span class="main-text">
Login
</span>
</h1>
<p class="lead"><span class="main-text">
Login Now!
</span></p>
</div>
</div>
</div>
<!-- Content -->
<div class="d-flex justify-content-center fadeIn">
<div class="col-md-8 col-xs-12">
<div class="d-flex justify-content-center">
<div class="col-md-6 pt-5 pb-5 pr-0 pl-0">
<form class="form-horizontal" method="post">
<div class="form-group">
<div class="col-xs-12">
<div class="">
<label for="id_username">E-Mail</label>
<input id="id_username" class="form-control" maxlength="254" name="username" value="" type="text" required>
</div>
</div>
</div>
<div class="form-group">
<div class="col-xs-12">
<div class="">
<label for="id_password">Password</label>
<input id="id_password" class="form-control" name="password" type="password" required>
</div>
</div>
</div>
<div class="form-group">
<div class="col-xs-12">
<small class="float-right">
<a href="#" class="kf-links">Forgot Password?</a>
</small>
</div>
</div>
<div class="form-group mt-5">
<div class="col-xs-12 col-sm-6 col-sm-offset-3 col-md-4 col-md-offset-4 pl-0">
<button class="btn btn-sm btn-block btn-primary" type="submit">Login</button>
</div>
</div>
</form>
</div>
</div>
</div>
</div>
<!-- END Content -->
<!-- END Main Container -->
<!-- Footer -->
<footer class="d-flex justify-content-center mt-auto">
<div class="d-flex justify-content-between col-md-8 col-md-offset-2 mb-3 mt-5">
<!-- Copyright Info -->
<div class="align-left">
<a class="font-weight-bold small kf-blue kf-links" href="#">Link1</a> |
<a class="font-weight-bold small kf-blue kf-links" href="/">Link2</a> |
<a class="font-weight-bold small kf-blue kf-links" href="/">Link3</a>
</div>
<div class="align-right small">
Crafted with Love by <a class="font-weight-bold kf-blue kf-links" href="#" target="_blank">Me</a>
</div>
<!-- END Copyright Info -->
</div>
</footer>
<!-- END Footer -->
</div>
<!-- END Page Container -->
</body>
</html>
codepen updated https://codepen.io/anon/pen/PBpgNN
reminder for boostrap classes https://getbootstrap.com/docs/4.5/utilities/flex/ about sizing see https://getbootstrap.com/docs/4.5/utilities/sizing/
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