Expand Underline On Click Navigation

Code By: Aaron Iker from Codepen

1. Html

[code language=”html”]

<nav>
<ul>
<li class="active"><a href="">First</a></li>
<li><a href="">Second</a></li>
<li><a href="">Third</a></li>
</ul>
</nav>
[/code]

2. CSS/Sass

[code language=”css”]
*
box-sizing: border-box

body
background: #1A1E23
font-family: ‘Lato’, sans-serif
-webkit-font-smoothing: antialiased

nav
position: relative
padding-bottom: 12px
.line
height: 2px
position: absolute
bottom: 0
margin: 10px 0 0 0
background: #FF1847
ul
padding: 0
margin: 0
list-style: none
display: flex
li
margin: 0 40px 0 0
opacity: .4
transition: all 0.4s ease
&:hover
opacity: .7
&.active
opacity: 1
&:last-child
margin-right: 0
a
text-decoration: none
color: #fff
text-transform: uppercase
display: block
font-weight: 600
letter-spacing: .2em
font-size: 14px

//Center
body
display: flex
justify-content: center
align-items: center
min-height: 100vh

[/code]

3. Js

[code language=”js”]
var nav = $(‘nav’);
var line = $(‘<div />’).addClass(‘line’);

line.appendTo(nav);

var active = nav.find(‘.active’);
var pos = 0;
var wid = 0;

if(active.length) {
pos = active.position().left;
wid = active.width();
line.css({
left: pos,
width: wid
});
}

nav.find(‘ul li a’).click(function(e) {
e.preventDefault();
if(!$(this).parent().hasClass(‘active’) && !nav.hasClass(‘animate’)) {

nav.addClass(‘animate’);

var _this = $(this);

nav.find(‘ul li’).removeClass(‘active’);

var position = _this.parent().position();
var width = _this.parent().width();

if(position.left >= pos) {
line.animate({
width: ((position.left – pos) + width)
}, 300, function() {
line.animate({
width: width,
left: position.left
}, 150, function() {
nav.removeClass(‘animate’);
});
_this.parent().addClass(‘active’);
});
} else {
line.animate({
left: position.left,
width: ((pos – position.left) + wid)
}, 300, function() {
line.animate({
width: width
}, 150, function() {
nav.removeClass(‘animate’);
});
_this.parent().addClass(‘active’);
});
}

pos = position.left;
wid = width;
}
});

[/code]

Fluid tab active state

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