KP Joy KP Joy - 1 year ago 119
Javascript Question

TABS in HTML: Select first TAB by default

I am trying TABBING in HTML. I am using a tutorial from W3SCHOOLS (

Following is the source code. It works fine but the problem I am facing is to select first tab by default which is missing in this tutorial. I want that first tab should be automatically selected when the page loads and the content of that should be displayed automatically.

<!DOCTYPE html>
body {font-family: "Lato", sans-serif;} {
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
border: 1px solid #ccc;
background-color: #f1f1f1;

/* Float the list items side by side */ li {float: left;}

/* Style the links inside the list items */ li a {
display: inline-block;
color: black;
text-align: center;
padding: 14px 16px;
text-decoration: none;
transition: 0.3s;
font-size: 17px;

/* Change background color of links on hover */ li a:hover {
background-color: #ddd;

/* Create an active/current tablink class */ li a:focus, .active {
background-color: #ccc;

/* Style the tab content */
.tabcontent {
display: none;
padding: 6px 12px;
-webkit-animation: fadeEffect 1s;
animation: fadeEffect 1s;

@-webkit-keyframes fadeEffect {
from {opacity: 0;}
to {opacity: 1;}

@keyframes fadeEffect {
from {opacity: 0;}
to {opacity: 1;}

<h3>Fade in Tabs</h3>

<ul class="tab">
<li><a href="#" class="tablinks" onclick="openCity(event, 'London')">London</a></li>
<li><a href="#" class="tablinks" onclick="openCity(event, 'Paris')">Paris</a></li>
<li><a href="#" class="tablinks" onclick="openCity(event, 'Tokyo')">Tokyo</a></li>

<div id="London" class="tabcontent">
<p>London is the capital city of England.</p>

<div id="Paris" class="tabcontent">
<p>Paris is the capital of France.</p>

<div id="Tokyo" class="tabcontent">
<p>Tokyo is the capital of Japan.</p>

function openCity(evt, cityName) {
var i, tabcontent, tablinks;
tabcontent = document.getElementsByClassName("tabcontent");
for (i = 0; i < tabcontent.length; i++) {
tabcontent[i].style.display = "none";
tablinks = document.getElementsByClassName("tablinks");
for (i = 0; i < tablinks.length; i++) {
tablinks[i].className = tablinks[i].className.replace(" active", "");
document.getElementById(cityName).style.display = "block";
evt.currentTarget.className += " active";


What change should I make in Javascript to select first tab by default. I tried following line inside for loop but did not work:

tablinks[0].className += " active";

Answer Source

In the anchor tag of first li add class=active and in the following div add display block div id=London class=tabcontent style=display:block

Here is a working JSfiddle

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