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Jiert/JavaScript-Tabs.js

Last active November 29, 2023 11:40
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Creating Tabs with Vanilla JavaScript
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JavaScript-Tabs.js
<!DOCTYPE html>
<html lang="en">
<head>
<title>Tabs</title>
<style>
.nav .active a { color: red; }
.tab-pane { display: none; }
.tab-pane.active { display: block; }
</style>
</head>
<body>
<div>
<!-- Tabs -->
<ul id="nav-tab" class="nav">
<li class="active"><a href="#home">Home</a></li>
<li><a href="#profile">Profile</a></li>
<li><a href="#messages">Messages</a></li>
<li><a href="#settings">Settings</a></li>
</ul>
<!-- Tab panes -->
<div class="tab-content">
<div class="tab-pane active" id="home">Home Panel</div>
<div class="tab-pane" id="profile">Profile Panel</div>
<div class="tab-pane" id="messages">Messages Panel</div>
<div class="tab-pane" id="settings">Settings Panel</div>
</div>
</div>
<footer>
<script type="text/javascript">
(function(){
function onTabClick(event){
var actives = document.querySelectorAll('.active');
// deactivate existing active tab and panel
for (var i=0; i < actives.length; i++){
actives[i].className = actives[i].className.replace('active', '');
}
// activate new tab and panel
event.target.parentElement.className += ' active';
document.getElementById(event.target.href.split('#')[1]).className += ' active';
}
var el = document.getElementById('nav-tab');
el.addEventListener('click', onTabClick, false);
})();
</script>
</footer>
</body>
</html>
@JonathanMontane
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JonathanMontane commented Jul 4, 2016 •
edited
Loading

a small warning:

40: actives[i].className = actives[i].className.replace('active', '');

will replace some-other-class-that-contains-active-keyword into some-other-class-that-contains--keyword, and will only remove the first occurence of the classname in the whole className string. A preferred solution might be to use the regex /(^|\s)active($|\s)/g

A more generic clearClass could be:

function clearClass(selector, className) {
    var selection = document.querySelector(selector);
    var re = new RegExp("(^|\\s)" + className + "($|\\s)", "g");
    for (var i = selection.length - 1; i >= 0 ; i--) {
        selection[i].className = selection[i].className.replace(re, ' ');
    }
}

Note that this clearClass function will fail if there are two instances of the className right next to each other.

@Zara603
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Zara603 commented May 8, 2020

There's few problems with this implementation, it's listening to any click on nav-tab so if user clicks on ul or li there's no href and event.target.href is undefined so you cant .split on it. Also instead of using split you could simply use getAttribute("href")

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