My challenge was to write a piece of
jQuery which:
- Takes note of the page path.
- Compares it with the Bootstrap navigation.
- Makes the navigation element 'active' to remind the users where they are in relation to the site.
First the HTML. Notice, that I have not set any navigation item as active. The plugin will do this. The plugin call is in
red.
<!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">
<title>Activate Navigation Entry</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/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>
<body>
<nav class="navbar navbar-default" role="navigation">
<div class="container">
<!-- 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><a href="index.php">Home</a></li>
<li><a href="about.php">About</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.php">Action</a></li>
<li><a href="anotheraction.php">Another action</a></li>
</ul>
</li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container -->
</nav>
<div class="row">
<div class="container">
<div class="col-md-12">
<h1>Home</h1>
</div>
</div>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/js/bootstrap.min.js"></script>
<script src="activatenav.plugin.js"></script>
<script>
(function()
{
$(document).activatenav(
{
toplevel:'ul.nav.navbar-nav > li > a',
dropdown:'ul.nav.navbar-nav > li.dropdown > ul.dropdown-menu > li > a'
});
})();
</script>
</body>
</html>
Next the jQuery plugin named 'activatenav.plugin.js'.
First calculate the end of the path. If there is no name, it must be the home page, so set that as active.
I also check if the current page is from the drop down menu. If so, set both the drop down heading and the corresponding navigation item as 'active'.
(function($)
{
$.fn.extend(
{
activatenav:function(options)
{
var pname = window.location.pathname;
var pArr = pname.split('/');
var defaults =
{
toplevel:'',
dropdown:''
};
options = $.extend(defaults, options);
if(options.toplevel)
{
handled = $(this).handleTopLevel(options.toplevel, pArr[pArr.length-1]);
if(handled == false)
{
$(this).handleDropdown(options.dropdown, pArr[pArr.length-1]);
}
}
}
});
$.fn.handleTopLevel = function(str, pth)
{
var hd = false;
if(!pth)
{
$(str).first().parent().addClass('active');
}
else
{
$(str).each(function()
{
if($(this).attr('href') == pth)
{
$(this).parent().addClass('active');
hd = true;
}
});
}
return hd;
};
$.fn.handleDropdown = function(str, pth)
{
$(str).each(function()
{
if($(this).attr('href') == pth)
{
$(this).parent().addClass('active');
$(this).closest('li.dropdown').addClass('active');
}
});
};
})(jQuery);
