Hovering over li element not showing div element

Hovering over li element not showing div element - javascript

Hello I am new to HTML and CSS, and I was trying to display the contents of a div element when I hover over a li element. So basically what I am trying to do is when I hover over one li element (say: ls1), I want to display dv2. However, my code does not display the contents even when I hover over it. Please help!! Thank you.
const list_dv1 = document.querySelectorAll('.dv1 li');
function show_item() {
list_dv1.forEach((item) =>
item.classList.remove('hovered'));
this.classList.add('hovered');
}
list_dv1.forEach((item) =>
item.addEventListener('mouseover', show_item));
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
.main {
position: relative;
background-color: black;
height: 100vh;
width: 100%;
}
.dv1 {
background-color: yellow;
cursor: pointer;
}
.dv1 li:hover {
transform: scale(1.2);
}
ul {
list-style-type: none;
display: flex;
}
li {
margin: 20px;
}
.dv2 {
background-color: greenyellow;
color: black;
}
.dv2 {
display: none;
}
.ls1:hover+.dv2 {
display: block;
}
.dv3 {
background-color: yellowgreen;
color: black;
}
<!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=1.0">
<link rel="stylesheet" href="styles.css">
<title>Practice Hiding Elements</title>
</head>
<body>
<div class="main">
<div class="dv1">
<ul>
<li class="ls1">Hover over me once</li>
<li class="ls2">Hover over me twice</li>
</ul>
</div>
<div class="dv2">You found me!</div>
<div class="dv3">You found me twice!</div>
</div>
</body>
</html>

Related

Why doesn't content hide?

I have a test HTML file in which I toggle the class 'hide' with JavaScript but the content does not hide, I can't understand why, what can be done in order to get the content to toggle between hide/show.
function init() {
let button = document.querySelector('#menubutton');
button.onclick = buttonClicked;
}
function buttonClicked(event) {
let content = document.querySelector('.content');
content.classList.toggle('hide');
}
window.addEventListener('load', init);
.hide {
display: none;
}
.menu {
position: relative;
}
.content {
display: flex;
flex-flow: column wrap;
border: 1px solid gray;
padding: 0.25rem;
position: absolute;
}
.color {
background-color: pink;
border: 1px solid gray;
width: 4rem;
height: 4rem;
}
<!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=1.0">
<title>Document</title>
</head>
<body>
<div class="menu">
<div class="title">
<button id="menubutton">Toggle</button>
</div>
<div class="content">
Uno
Dos
Tres
Cuatro
Cinco
</div>
</div>
<div class="color"></div>
</body>
</html>

When you add the hide class, the element has two classes, and they both specify different display properties. The property from .content is taking precedence.
Make your selector more specific so it will take precedence, use .content.hide.
function init() {
let button = document.querySelector('#menubutton');
button.onclick = buttonClicked;
}
function buttonClicked(event) {
let content = document.querySelector('.content');
content.classList.toggle('hide');
}
window.addEventListener('load', init);
.content.hide {
display: none;
}
.menu {
position: relative;
}
.content {
display: flex;
flex-flow: column wrap;
border: 1px solid gray;
padding: 0.25rem;
position: absolute;
}
.color {
background-color: pink;
border: 1px solid gray;
width: 4rem;
height: 4rem;
}
<!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=1.0">
<title>Document</title>
</head>
<body>
<div class="menu">
<div class="title">
<button id="menubutton">Toggle</button>
</div>
<div class="content">
Uno
Dos
Tres
Cuatro
Cinco
</div>
</div>
<div class="color"></div>
</body>
</html>
Another possibility is to use !important in the .hide CSS to make it override other styles.
function init() {
let button = document.querySelector('#menubutton');
button.onclick = buttonClicked;
}
function buttonClicked(event) {
let content = document.querySelector('.content');
content.classList.toggle('hide');
}
window.addEventListener('load', init);
.hide {
display: none !important;
}
.menu {
position: relative;
}
.content {
display: flex;
flex-flow: column wrap;
border: 1px solid gray;
padding: 0.25rem;
position: absolute;
}
.color {
background-color: pink;
border: 1px solid gray;
width: 4rem;
height: 4rem;
}
<!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=1.0">
<title>Document</title>
</head>
<body>
<div class="menu">
<div class="title">
<button id="menubutton">Toggle</button>
</div>
<div class="content">
Uno
Dos
Tres
Cuatro
Cinco
</div>
</div>
<div class="color"></div>
</body>
</html>

When you do toggle, the classes are being toggled this way:
"content"
and
"content hide"
Now, both content and hide set display property. When there's such conflict, the rule that is defined later (either within <style> or in a further stylesheet) takes precedence.
You could see #Barmar's answer which shows !important and .content.hide to force higher precedence.
Or you could just define .hide after .content which gives it higher precedence.
function init() {
let button = document.querySelector('#menubutton');
button.onclick = buttonClicked;
}
function buttonClicked(event) {
let content = document.querySelector('.content');
content.classList.toggle('hide');
}
window.addEventListener('load', init);
.menu {
position: relative;
}
.content {
display: flex;
flex-flow: column wrap;
border: 1px solid gray;
padding: 0.25rem;
position: absolute;
}
.hide {
display: none;
}
.color {
background-color: pink;
border: 1px solid gray;
width: 4rem;
height: 4rem;
}
<!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=1.0">
<title>Document</title>
</head>
<body>
<div class="menu">
<div class="title">
<button id="menubutton">Toggle</button>
</div>
<div class="content">
Uno
Dos
Tres
Cuatro
Cinco
</div>
</div>
<div class="color"></div>
</body>
</html>

clip-path bounces at the top due to offset in Javascript?

I have created a hover effect like whenever you hover on the box you will see a circle (actually it is a div with position: absolute whose clip-path position is controlled by Javascript offset) and when this circle reaches the second paragraph element it jumps to the top.
So I wanna know why it's happening and how to make the circle move consistently throughout the box without giving a jerk or moving to the top.
Here is my code
let container = document.querySelector(".container")
let secondDiv = document.querySelector(".test")
secondDiv.addEventListener("mousemove",function(e){
secondDiv.style.setProperty("--x",e.offsetX + "px")
secondDiv.style.setProperty("--y",e.offsetY + "px")
//console.log(e.offsetX)
})
*{
margin: 0;
padding: 0;
box-sizing: border-box;
font-family: sans-serif;
}
.container{
width:70%;
margin: 0 auto;
border:2px solid red;
height:150px;
position:relative;
background: #9F86C0;
color:white;
margin-top: 10%;
}
.container p{
font-size:2.3em;
}
.container .content{
position: absolute;
top:0;
left:0;
width: 100%;
height:150px;
padding:1em;
}
.container .content:nth-child(2){
background: #E0B1CB;
color:white;
clip-path:circle(50px at var(--x) var(--y))
}
<!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=1.0">
<title>Document</title>
</head>
<body>
<div class="container">
<div class="content check">
<p>Hello People hover me</p>
<p>What's going on?</p>
</div>
<div class="content test">
<p>Hello People hover me</p>
<p>What's going on?</p>
</div>
</div>
</body>
</html>

Since there are two paragraphs in place, the mouse movement triggers to choose the paragraph over the parent. You can choose to turn off the trigger using pointer-events: none on the paragraph elements.
let container = document.querySelector(".container")
let secondDiv = document.querySelector(".test")
container.addEventListener("mousemove", function(e) {
secondDiv.style.setProperty("--x", e.offsetX + "px")
secondDiv.style.setProperty("--y", e.offsetY + "px")
//console.log(e.offsetX)
})
* {
margin: 0;
padding: 0;
box-sizing: border-box;
font-family: sans-serif;
}
.container {
width: 70%;
margin: 0 auto;
border: 2px solid red;
height: 150px;
position: relative;
background: #9F86C0;
color: white;
margin-top: 10%;
}
.container p {
font-size: 2.3em;
pointer-events: none; /* Added */
}
.container .content {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 150px;
padding: 1em;
}
.container .content:nth-child(2) {
background: #E0B1CB;
color: white;
clip-path: circle(50px at var(--x) var(--y))
}
<!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=1.0">
<title>Document</title>
</head>
<body>
<div class="container">
<div class="content check">
<p>Hello People hover me</p>
<p>What's going on?</p>
</div>
<div class="content test">
<p>Hello People hover me</p>
<p>What's going on?</p>
</div>
</div>
</body>
</html>

Cannot adjust the height of container accordingly to the content [duplicate]

This question already has answers here:
What is a clearfix?
(10 answers)
What methods of ‘clearfix’ can I use?
(29 answers)
Closed 1 year ago.
I have this CSS project I am working on and now I am in the phase where I will start to embelish it with some effects and nice colors. However I just realized that there is a small issue with it: the beige container won't adjust its height as the blue cells move around. Could anyone help please? Here it is my code:
HTML
<!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=1.0">
<script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script>
<script src="OEPanel.js"></script>
<link rel="stylesheet" href="./OEPanel.css">
<title>Document</title>
</head>
<body>
<div id="oepanelcontainer" class="OEContainer">
<div id="oepanel" class="OEItems">
<div id="oecell1" class="OECell"></div>
<div id="oecell2" class="OECell"></div>
<div id="oecell3" class="OECell"></div>
<div id="oecell4" class="OECell"></div>
</div>
</body>
</html>
CSS
.OEContainer {
background-color: beige;
min-height: 10em;
vertical-align: middle;
padding: 10px;
max-width:1130px;
margin:auto;
text-align:center;
justify-content:space-between;
}
.OEItems {
min-height: 10em;
vertical-align: middle;
padding: 0px;
max-width:1130px;
margin:auto;
text-align:center;
justify-content:space-between;
}
.OECell {
background-color: lightblue;
min-height: 10em;
vertical-align: middle;
padding: 0px;
width:250px;
text-align:center;
float: left;
margin: 5px;
}
#media (max-width: 500px) {
.OEContainer {
flex-direction: column;
align-items: center;
}
}
JS
// config
var __OECELLS = 4; // the total of oecells in HTML (oecell1, oecell2...)
var __CELLWIDTH = 250; // the width of cells in pixels
var __MAXSCREENWIDTH = 1130; // the maximum width of screen in pixels
var __MAXCELLS = parseInt(__MAXSCREENWIDTH/__CELLWIDTH);
var __ADJUSTMENT = (__CELLWIDTH-30)/2;
var __CELLSPERROW;
$(function() {
RedefinePanel();
});
$(window).resize(function() {
RedefinePanel();
});
function RedefinePanel() {
var viewportWidth = $(window).width();
let __CELLSPERROW = parseInt((viewportWidth-__ADJUSTMENT)/__CELLWIDTH);
document.getElementById("oepanel").style.width = ((__CELLSPERROW)*__CELLWIDTH+(__CELLSPERROW*17)) + "px";
Thanks!

You need a clearfix for the container of your floated items.
.OEContainer {
background-color: beige;
min-height: 10em;
vertical-align: middle;
padding: 10px;
max-width:1130px;
margin:auto;
text-align:center;
justify-content:space-between;
}
.OEItems {
min-height: 10em;
vertical-align: middle;
padding: 0px;
max-width:1130px;
margin:auto;
text-align:center;
justify-content:space-between;
}
.clearfix::after { /* clearfix class to expand the element back to its normal height */
content: '';
display: block;
clear: both;
}
.OECell {
background-color: lightblue;
min-height: 10em;
vertical-align: middle;
padding: 0px;
width:250px;
text-align:center;
float: left;
margin: 5px;
}
#media (max-width: 500px) {
.OEContainer {
flex-direction: column;
align-items: center;
}
}
<!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=1.0">
<script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script>
<script src="OEPanel.js"></script>
<link rel="stylesheet" href="./OEPanel.css">
<title>Document</title>
</head>
<body>
<div id="oepanelcontainer" class="OEContainer">
<div id="oepanel" class="OEItems clearfix"> <!-- clearfix class added here -->
<div id="oecell1" class="OECell"></div>
<div id="oecell2" class="OECell"></div>
<div id="oecell3" class="OECell"></div>
<div id="oecell4" class="OECell"></div>
</div>
</body>
</html>
When you use floats for all of the children of an element - it will collapse 0 height ( minus padding and margins etc ) unless you force it to expand to the size of it's children with a clearfix. Essentially it's a bug/quirk in browsers that's been persistent for a while.
Although this answers your questions I would advise against using floats wherever possible and use flexbox instead. Overall a lot less messy than floats in my opinion.

how to bring the Content of the dropdown menu button on top of the page displayed within my main.html using frameset tag

My main.html displays the menu.htm and welcome.htm using frameset. Drop down menu buttons "Admin..." and "Scheduler..." suppose to show dropdown content on mouse hover. Since welcome.htm is on top of menu.htm therefore content of the dropdown button doesn't show up.
However, All menu button work as expected when open the menu.htm as standalone page(see attached pic)menu.htm But drop-down buttons content does not show up when open in main.html using frame tags.
main.html
<html>
<head>
<title>Main Menu</title>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252"></meta>
<meta http-equiv="cache-control" content="max-age=0" />
</head>
<frameset rows = "25,*" >
<frame frameborder="0" marginheight="0" marginwidth="0" scrolling="no" id="menu_frame1"
name="menu_frame" src="menu.htm" />
<frame frameborder="0" marginheight="0" marginwidth="0" scrolling="auto"
id="content_frame1" name="content_frame" src="welcome.htm" />
</frameset>
</html>
Here is menu.htm
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252"></meta>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<title>Main Menu</title>
<style type="text/css">
body
{
background-color: #333;
border: 0px;
margin: 0px;
padding: 0px;
FONT-SIZE: 15px;
FONT-FAMILY: sans-serif;
}
.topnav
{
overflow: hidden;
background-color: green;
}
.topnav a
{
float: left;
color: #fec10d;
font-size: 15px;
text-align: center;
text-decoration: none;
font-weight: none;
padding-left: 10px;
padding-right: 10px;
}
.topnav a:hover
{
background-color: #ddd;
text-decoration: underline;
color: black;
}
.topnav a.active
{
margin-top: 5px;
}
.topnav-right
{
float: right;
}
.dropdown
{
float: left;
overflow: hidden;
}
.dropdown .dropbtn
{
font-size: 15px;
border: none;
outline: none;
color: #fec10d;
padding: 5px 7px;
background-color: inherit;
font-family: inherit;
margin: 0;
}
.topnav a:hover, .dropdown:hover .dropbtn
{
background-color: #fec10d;
color: white;
}
.dropdown-content
{
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 90px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
}
.dropdown-content a
{
float: none;
background-color: #582c83;
color: white;
padding: 5px 7px;
text-decoration: none;
display: block;
text-align: left;
}
.dropdown-content a:hover
{
background-color: #fec10d;
}
.dropdown:hover .dropdown-content
{
display: block;
}
</style>
<script type="text/javascript">
function open_in_content(url)
{
parent.document.getElementById("content_frame").src = url;
}
function open_in_new(url)
{
window.open(url);
}
</script>
</head>
<body>
<div class="topnav">
<a class="active" href="/mainmenu" target="_top">Home</a>
<a class="active" href="/acctlist" target="content_frame">Accounts</a>
<a class="active" href="/reports/main" target="content_frame">Customers</a>
<div class="dropdown">
<button class="dropbtn">Admin...<i class="fa fa-caret-down"></i></button>
<div class="dropdown-content">
Add Account
Files
Add Rule
Account Update
Ref Upload
Check stats
</div>
</div>
<div class="dropdown">
<button class="dropbtn">Scheduler...<i class="fa fa-caret-down"></i></button>
<div class="dropdown-content">
New Job
Remove Job
Add checkpoint
</div>
</div>
<a class="active" href="help/index.htm" target="content_frame">Help</a>
</div>
</body>
</html>
Here is welcome.htm
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=windows-1252">
<TITLE>
Main Menu Welcome Page
</TITLE>
</HEAD>
<BODY>
Use the links at the top of the menu to navigate.
</BODY>
</HTML>

first of all Why not use html5?
You should use iframe instead of frame
https://www.w3schools.com/tags/tryit.asp?filename=tryhtml_iframe
after, you add id to iframe and you add display option or you add "position:absolute;z-index" these iframes with css.
after, then was mouseover in iframe you change z-index option with javascript

I help you but first
Can you review jquery.load()
https://api.jquery.com/load/
I think it might be easier for you.
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
</head>
<body>
<div id="divMenu"></div>
</body>
</html>
<script>
$(document).ready(function(){
$("#divMenu").load("./menu.html");//.txt or html or url
});
</script>

try this
Even if the scroll page, the menu will remain at the top.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title></title>
<style>
body{background-color:#333}
*{margin:0;padding:0;border:0}
.menuBar{width:100%;height:50px;position:fixed;left:0;top:0;z-index:999;background-color:#111;}
.content{float: left;width:100%;margin-top:50px;height:100vh;}
</style>
</head>
<body>
<iframe class="menuBar" src="./menu.html" ></iframe>
<iframe class="content" src="./welcome.html" ></iframe>
</body>
</html>

try this
I made the "manubar "background transparent and when mouseover and manubar the height will automatically 300px
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title></title>
<style>
body{background-color:#333}
*{margin:0;padding:0;border:0}
.menuBar{width:100%;height:50px;position:fixed;left:0;top:0;z-index:999;background-color:transparent;}
.content{float: left;width:100%;margin-top:50px;height:100vh;}
</style>
</head>
<body>
<iframe class="menuBar" src=".menu.html" ></iframe>
<iframe class="content" src="./welcome.html" ></iframe>
</body>
</html>
<script>
var menuBar = document.querySelector(".menuBar")
menuBar.onmouseover = function(){
menuBar.style.height="300px"
}
menuBar.onmouseout = function(){
menuBar.style.height="50px"
}
</script>

Basic Web Development adding selected Nav Bar

Currently doing a Web Dev assignment, wanted to have my navbar a different color for the set page so that it does not change when clicked but the page loads. Not sure how to change this, hopefully there is someone to help me out, looking for a quick answer because it is for a assingment.
Thanks in advance!
* {
box-sizing: border-box;
}
body {
margin: 0;
}
/* Style the header */
.header {
background-color: #6699cc;
padding: 20px;
color: #e6e6e6;
text-align: center;
}
/* Style the top navigation bar */
.topnav {
overflow: hidden;
color: #993333;
}
/* When the nav bar is selected */
.topnav
{
color: white;
background-color: chartreuse;
}
.nav-item > a:hover {
color: aqua;
}
/* Style the topnav links */
.topnav a {
float: left;
display: block;
color: #f2f2f2;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
/* Change color on hover */
.topnav a:hover {
background-color: #ddd;
color: black;
}
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" rel="stylesheet">
<link href="styles.css" rel="stylesheet">
<title>Page 1</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="style1.css">
<style></style>
</head>
<body>
<div class="header">
<h1>Page 1</h1>
</div>
<div class="topnav">
Home
Page 1
Page 2
Page 3
Link
</div>
</style>
</head>
<body>
<p>Select what background you'd like to use here!</p>
<button id="aqua">Dark Cyan</button>
<button id="green">Green</button>
<button id="slate_gray">Slate Gray</button>
<button id="reset">Reset</button>
<script>
document.querySelector('#aqua').onclick = function() {
document.querySelector('body').style.backgroundColor = '#008B8B';
}
document.querySelector('#green').onclick = function() {
document.querySelector('body').style.backgroundColor = '#99ff99';
}
document.querySelector('#slate_gray').onclick = function() {
document.querySelector('body').style.backgroundColor = '#708090';
}
document.querySelector('#reset').onclick = function() {
document.querySelector('body').style.backgroundColor = '#F8F8FF';
}
</script>
The CSS code:

A quick fix would be to create a .current class. Then apply the current class to the link of the page that you are on.. Something like
* {
box-sizing: border-box;
}
body {
margin: 0;
}
/* Style the header */
.header {
background-color: #6699cc;
padding: 20px;
color: #e6e6e6;
text-align: center;
}
/* Style the top navigation bar */
.topnav {
overflow: hidden;
color: #993333;
}
.topnav .current {
background:gray;
color: black;
}
/* When the nav bar is selected */
.topnav
{
color: white;
background-color: chartreuse;
}
.nav-item > a:hover {
color: aqua;
}
/* Style the topnav links */
.topnav a {
float: left;
display: block;
color: #f2f2f2;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
/* Change color on hover */
.topnav a:hover {
background-color: #ddd;
color: black;
}
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" rel="stylesheet">
<link href="styles.css" rel="stylesheet">
<title>Page 1</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="style1.css">
<style></style>
</head>
<body>
<div class="header">
<h1>Page 1</h1>
</div>
<div class="topnav">
Home
Page 1
Page 2
Page 3
Link
</div>
</style>
</head>
<body>
<p>Select what background you'd like to use here!</p>
<button id="aqua">Dark Cyan</button>
<button id="green">Green</button>
<button id="slate_gray">Slate Gray</button>
<button id="reset">Reset</button>
<script>
document.querySelector('#aqua').onclick = function() {
document.querySelector('body').style.backgroundColor = '#008B8B';
}
document.querySelector('#green').onclick = function() {
document.querySelector('body').style.backgroundColor = '#99ff99';
}
document.querySelector('#slate_gray').onclick = function() {
document.querySelector('body').style.backgroundColor = '#708090';
}
document.querySelector('#reset').onclick = function() {
document.querySelector('body').style.backgroundColor = '#F8F8FF';
}
</script>
The CSS code:
HTML - HOME PAGE (index.html)
<div class="topnav">
Home
Page 2
Page 3
Link
</div>
Then on the next page you add the class to the next link. So for page 2 it will look like this
HTML - PAGE 2 (page2.html)
<div class="topnav">
Home
Page 2
Page 3
Link
</div>
Removed the current class from home link and added it to the second link. And on each page you add the class to the link of the page you are on.

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