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Creating Tabs with Vanilla JavaScript
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| <!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> |
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.
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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It sounds like parentElement isn't defined. What versions of chrome and safari are you using?