I am using 100% heights for the body element of a webpage I am building so as to be able to set proportional heights for contained elements to control the heights of them and the revealing of their background images.
When using the Bootstrap affix plugin to control positioning of an element while scrolling the web page, if html, body { height:100% } is defined, the affixed element does not behave as intended. It can jump up the page seemingly unpredictably.
Here is a code example. Remove the html, body { height: 100%; } to get the affixed element to function properly.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
<title>Bootstrap Affix Tutorial</title>
<!-- Bootstrap -->
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
<!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
<![endif]-->
</head>
<style type="text/css">
/*This will cause the affix plugin to set the wrong top for the affixed element*/
html, body {
height: 100%;
}
/*The purpose of settting the height above is so we can set the height of this element*/
.jumbotron {
height: 50%;
}
.affix {
top: 20px;
}
.affix-top {
}
.affix-bottom {
position: absolute;
}
footer {
height: 320px;
background-color: #666;
}
</style>
<body>
<nav class="navbar navbar-default">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Brand</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Link <span class="sr-only">(current)</span></a></li>
<li><a href="#">Link</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Dropdown <span class="caret"></span></a>
<ul class="dropdown-menu" role="menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li class="divider"></li>
<li><a href="#">Separated link</a></li>
<li class="divider"></li>
<li><a href="#">One more separated link</a></li>
</ul>
</li>
</ul>
<form class="navbar-form navbar-left" role="search">
<div class="form-group">
<input type="text" class="form-control" placeholder="Search">
</div>
<button type="submit" class="btn btn-default">Submit</button>
</form>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Link</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Dropdown <span class="caret"></span></a>
<ul class="dropdown-menu" role="menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
<div class="jumbotron">
<h1>This jumbotron</h1>
<p>Disable <code>body { height: 100%; }</code> to get the affixed menu element to work as intended.</p>
<small>Bootstrap 3.3.4</small>
</div>
<section>
<div class="container">
<div class="row">
<div class="col-xs-4">
<h3>Hello, world!</h3>
<ul class="nav nav-pills nav-stacked" id="affixer" data-spy="affix">
<li role="presentation" class="active"><a href="#">Home</a></li>
<li role="presentation"><a href="#">Tutorial 1</a></li>
<li role="presentation"><a href="#">Tutorial 2</a></li>
<li role="presentation"><a href="#">Tutorial 3</a></li>
<li role="presentation"><a href="#">Tutorial 4</a></li>
<li role="presentation"><a href="#">Tutorial 5</a></li>
<li role="presentation"><a href="#">Tutorial 6</a></li>
<li role="presentation"><a href="#">Tutorial 7</a></li>
<li role="presentation"><a href="#">Tutorial 8</a></li>
<li role="presentation"><a href="#">Tutorial 9</a></li>
</ul>
</div><!-- /.col-* -->
<div class="col-xs-8">
<h2 id="one">Tutorial One</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Nam eu sem tempor, varius quam at, luctus dui. Mauris magna
metus, dapibus nec turpis vel, semper malesuada ante.
Vestibulum id metus ac nisl bibendum scelerisque non non
purus. Suspendisse varius nibh non aliquet sagittis. In
tincidunt orci sit amet elementum vestibulum. Vivamus
fermentum in arcu in aliquam. Quisque aliquam porta odio
in fringilla. Vivamus nisl leo, blandit at bibendum eu,
tristique eget risus. Integer aliquet quam ut elit suscipit,
id interdum neque porttitor. Integer
faucibus ligula.</p>
<p>Vestibulum quis quam ut magna consequat faucibus.
Pellentesque eget nisi a mi suscipit tincidunt. Ut tempus
dictum risus. Pellentesque viverra sagittis quam at mattis.
Suspendisse potenti. Aliquam sit amet gravida nibh,
facilisis gravida odio. Phasellus auctor velit at lacus
blandit, commodo iaculis justo viverra. Etiam vitae est
arcu. Mauris vel congue dolor. Aliquam eget mi mi. Fusce
quam tortor, commodo ac dui quis, bibendum viverra erat.
Maecenas mattis lectus enim, quis tincidunt dui molestie
euismod. Curabitur et diam tristique, accumsan nunc eu,
hendrerit tellus.</p>
<hr>
<h2 id="two">Tutorial Two</h2>
<p> Nullam hendrerit justo non leo aliquet imperdiet. Etiam
in sagittis lectus. Suspendisse ultrices placerat accumsan.
Mauris quis dapibus orci. In dapibus velit blandit pharetra
tincidunt. Quisque non sapien nec lacus condimentum facilisis
ut iaculis enim. Sed viverra interdum bibendum. Donec ac
sollicitudin dolor. Sed fringilla vitae lacus at rutrum.
Phasellus congue vestibulum ligula sed consequat.</p>
<p>Vestibulum consectetur scelerisque lacus, ac fermentum
lorem convallis sed. Nam odio tortor, dictum quis malesuada at,
pellentesque vitae orci. Vivamus elementum, felis eu auctor
lobortis, diam velit egestas lacus, quis fermentum metus ante
quis urna. Sed at facilisis libero. Cum sociis natoque
penatibus et magnis dis parturient montes, nascetur ridiculus
mus. Vestibulum bibendum blandit dolor. Nunc orci dolor,
molestie nec nibh in, hendrerit tincidunt ante. Vivamus sem
augue, hendrerit non sapien in, mollis ornare augue.</p>
<hr>
<h2 id="three">Tutorial Three</h2>
<p>Integer pulvinar leo id risus pellentesque vestibulum.
Sed diam libero, sodales eget sapien vel, porttitor bibendum
enim. Donec sed nibh vitae lorem porttitor blandit in nec ante.
Pellentesque vitae metus ipsum. Phasellus sed nunc ac sem
malesuada condimentum. Etiam in aliquam lectus. Nam vel sapien
diam. Donec pharetra id arcu eget blandit. Proin imperdiet
mattis augue in porttitor. Quisque tempus enim id lobortis
feugiat. Suspendisse tincidunt risus quis dolor fringilla
blandit. Ut sed sapien at purus lacinia porttitor. Nullam
iaculis, felis a pretium ornare, dolor nisl semper tortor, vel
sagittis lacus est consequat eros. Sed id pretium nisl.
Curabitur dolor nisl, laoreet vitae aliquam id, tincidunt sit
amet mauris. </p>
<p>Phasellus vitae suscipit justo. Mauris pharetra feugiat
ante id lacinia. Etiam faucibus mauris id tempor egestas. Duis
luctus turpis at accumsan tincidunt. Phasellus risus risus,
volutpat vel tellus ac, tincidunt fringilla massa. Etiam
hendrerit dolor eget ante rutrum adipiscing. Cras interdum
ipsum mattis, tempus mauris vel, semper ipsum. Duis sed dolor
ut enim lobortis pellentesque ultricies ac ligula. Pellentesque
convallis elit nisi, id vulputate ipsum ullamcorper ut. Cras
ac pulvinar purus, ac viverra est. Suspendisse potenti. Integer
pellentesque neque et elementum tempus. Curabitur bibendum in
ligula ut rhoncus.</p>
<p>Quisque pharetra velit id velit iaculis pretium. Nullam a
justo sed ligula porta semper eu quis enim. Pellentesque
pellentesque, metus at facilisis hendrerit, lectus velit
facilisis leo, quis volutpat turpis arcu quis enim. Nulla
viverra lorem elementum interdum ultricies. Suspendisse
accumsan quam nec ante mollis tempus. Morbi vel accumsan diam,
eget convallis tellus. Suspendisse potenti.</p>
<h2 id="three">Tutorial Four</h2>
<p>Integer pulvinar leo id risus pellentesque vestibulum.
Sed diam libero, sodales eget sapien vel, porttitor bibendum
enim. Donec sed nibh vitae lorem porttitor blandit in nec ante.
Pellentesque vitae metus ipsum. Phasellus sed nunc ac sem
malesuada condimentum. Etiam in aliquam lectus. Nam vel sapien
diam. Donec pharetra id arcu eget blandit. Proin imperdiet
mattis augue in porttitor. Quisque tempus enim id lobortis
feugiat. Suspendisse tincidunt risus quis dolor fringilla
blandit. Ut sed sapien at purus lacinia porttitor. Nullam
iaculis, felis a pretium ornare, dolor nisl semper tortor, vel
sagittis lacus est consequat eros. Sed id pretium nisl.
Curabitur dolor nisl, laoreet vitae aliquam id, tincidunt sit
amet mauris. </p>
<p>Phasellus vitae suscipit justo. Mauris pharetra feugiat
ante id lacinia. Etiam faucibus mauris id tempor egestas. Duis
luctus turpis at accumsan tincidunt. Phasellus risus risus,
volutpat vel tellus ac, tincidunt fringilla massa. Etiam
hendrerit dolor eget ante rutrum adipiscing. Cras interdum
ipsum mattis, tempus mauris vel, semper ipsum. Duis sed dolor
ut enim lobortis pellentesque ultricies ac ligula. Pellentesque
convallis elit nisi, id vulputate ipsum ullamcorper ut. Cras
ac pulvinar purus, ac viverra est. Suspendisse potenti. Integer
pellentesque neque et elementum tempus. Curabitur bibendum in
ligula ut rhoncus.</p>
<p>Quisque pharetra velit id velit iaculis pretium. Nullam a
justo sed ligula porta semper eu quis enim. Pellentesque
pellentesque, metus at facilisis hendrerit, lectus velit
facilisis leo, quis volutpat turpis arcu quis enim. Nulla
viverra lorem elementum interdum ultricies. Suspendisse
accumsan quam nec ante mollis tempus. Morbi vel accumsan diam,
eget convallis tellus. Suspendisse potenti.</p>
</div><!-- /.col-* -->
</div><!-- /.row -->
</div><!-- /.container -->
</section>
<div id="affix-stop" style="height:10px;"></div>
<footer>
<div class="container">
<h3>This footer</h3>
</div>
</footer>
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="http://code.jquery.com/jquery-1.11.3.min.js"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<!-- Latest compiled and minified JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
<script type="text/javascript">
$('#affixer').affix({
offset: {
top: $('#affixer').offset().top - 20,
bottom: $(document).height() - $('#affix-stop').offset().top
}
});
</script>
</body>
</html>I am looking for a solution to the problem of not being able to set the 100% html & body height, while retaining the intended functionality of the Bootstrap affix plugin, specifically the use of the data-offset-bottom feature.
There is a related answer here Bootstrap 3: How to affix after 100% height but it does not address the case of using the data-offset-bottom parameter with the affix.
I discovered the bug in my code after going through a comprehensive tutorial of the Bootstrap affix plugin http://www.sitepoint.com/understanding-bootstraps-affix-scrollspy-plugins/ .
