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Changing Header/Navbar Elements on Scroll

Currently struggling to add the .is-active class to my header via javascript. If you add "is-active" to the header classes it works well. But I can't seem to work it out in javascript.
I just want the class to be added as soon as you start scrolling, and then removed when returning to the top.
Appreciate all the help!
HTML:
<header class="header">
<div class="header-nav flex container">
<figure class="header-logo">
<a href="#">
<img class="header-logo-light" src="images/logoWhite.png" alt="San Miguel Services Logo">
<img class="header-logo-dark" src="images/logoDark.png" alt="San Miguel Services Logo">
</a>
</figure>
<nav class="header-menu flex">
<div class="header-menu-li">
WELCOME
SERVICES
ABOUT
PORTFOLIO
CONTACT
</div>
</nav>
<div class="header-btn">
<button href="#" class="button header-btn">REQUEST A QUOTE</button>
</div>
</div>
</header>
CSS:
.header {
position: fixed;
z-index: 1;
width: 100vw;
line-height: 18px;
}
.header .header-logo-dark {
opacity: 0;
display: none;
}
.header .header-logo-light {
opacity: 1;
display: block;
}
.header.is-active .header-logo-dark {
opacity: 1;
display: block;
}
.header.is-active .header-logo-light {
opacity: 0;
display: none;
}
.header.is-active .header-menu-li a {
color: $darkBlue;
&::before {
background: linear-gradient(to right, $mediumGreen, $lightGreen);
}
}
.header.is-active .header-btn button {
background: $mediumGreen;
color: $white;
transition: 300ms ease-in-out;
&:hover {
box-shadow: inset 0 0 0 2px $darkBlue;
color: $darkBlue;
background: transparent;
}
}
.header.is-active {
background: $white;
}
.header-nav {
padding: 20px 5.5%;
position: relative;
justify-content: space-between;
margin: auto;
}
.header-logo {
position: relative;
a img {
height: 46px;
}
}
.header-menu {
align-items: center;
}
.header-menu-li {
a {
position: relative;
margin: 0 0.625rem;
font-weight: 500;
font-size: $font-sm;
color: $white;
transition: color 300ms ease-in-out;
&::before {
content: "";
display: block;
position: absolute;
height: 5px;
background: $white;
left: 0;
right: 0;
bottom: -33px;
opacity: 0;
transition: opacity 300ms ease-in-out;
}
&:hover {
opacity: 0.95;
&::before {
opacity: 1;
}
}
}
}
.header-btn {
height: 46px;
font-size: $font-sm;
font-weight: 500;
button {
background: transparent;
border: 1px solid $white;
transition: 200ms ease-in-out;
&:hover {
background: $white;
color: $darkBlue;
}
}
}

Try this code:
window.addEventListener("scroll", function(){
var header = document.querySelector(".header");
header.classList.toggle("is-active", window.scrollY > 0);
})

Try to use more semantic HTML, this will help you in building the site.
<div class="menu">
<ul>
<li>Home</li>
</ul>
</div>
<section id="home">
<div class="wrapper">
</div>
</section>
You can also add some initial CSS settings to help you build your site, like :root, * {}, etc...
If you still don't know what a :root is, look it up, this will make it a lot easier.
I left some example code.
/* GENERAL */
* {
margin: 0;
padding: 0;
box-sizing: border-box;
list-style: none;
text-decoration: none;
}
:root {
font-size: 62.5%; /* 1rem = 10px */
}
html {
scroll-behavior: smooth;
}
html,
body {
width: 100%;
height: 100%;
}
body {
font-family: " ";
font-size: 1.6rem;
text-align: center;
overflow: overlay;
background-color: var(--name-var);
}
.wrapper {
width: min(50rem, 100%);
margin-inline: auto;
padding-inline: 2.4rem;
}
window.addEventListener('scroll', onScroll)
onScroll()
function onScroll() {
showNavOnScroll ();
showBackToTopButtonOnScroll();
activateMenuAtCurrentSection(home);
}
function activateMenuAtCurrentSection(section) {
const targetLine = scrollY + innerHeight / 2
// check if the section has passed the line
// what data will I need?
const sectionTop = section.offsetTop
const sectionHeight = section.offsetHeight
const sectionTopReachOrPassedTargetLine = targetLine >= sectionTop
// check if the base is below the target line
// what data will I need?
const sectionEndAst = sectionTop + sectionHeight
const sectionEndPassedTargetLine = sectionEndAst <= targetLine
console.log('Did the session bottom go over the line?', sectionEndPassedTargetLine)
// section boundaries
const sectionBoundaries =
sectionTopReachOrPassedTargetLine && !sectionEndPassedTargetLine
const sectionId = section.getAttribute('id')
const menuElement = document.querySelector(`.menu a[href*=${sectionId}]`)
menuElement.classList.remove('active')
if (sectionBoundaries) {
menuElement.classList.add('active')
}
}
// This is so that when you scroll down your navigation bar goes out
function showNavOnScroll() {
if (scrollY > 0) {
navigation.classList.add('scroll');
} else {
navigation.classList.remove('scroll');
}
}
// Will make them appear smooth
ScrollReveal({
origin:'top',
distance: '30px',
duration: 700,
}).reveal(`
#home`);

Setting an individual div opacity to 1 while parent opacity is set to .7 in React

I have a nav component as shown below with four props that are all booleans used to control UI styling
const Nav = ({ isNav, isVisibleTwo, isVisibleThree, isVisibleFour }) => {
return (
<nav className={isNav ? 'bubbs bubbs-enter' : 'bubbs'}>
<GiHamburgerMenu />
<a href="#projects-title">
<div className={isVisibleFour ? 'bubble bubble-active' : 'bubble'}>
<p>{`//`} P</p>
</div>
</a>
<a href="#resume-title">
<div className={isVisibleTwo ? 'bubble bubble-active' : 'bubble'}>
<p>{`//`} R</p>
</div>
</a>
<a href="#contact-me">
<div className={isVisibleThree ? 'bubble bubble-active' : 'bubble'}>
<p>{`//`} C</p>
</div>
</a>
</nav>
)
}
isNav controls whether the nav is visible or not by toggling classes that control opacity.
bubbs-enter sets opacity: 0.7
the problem I'm having is if the bubble-active class is applied I want the opacity of the bubble to be set to 1. Which is not working currently because the nav opacity is set to .7
is there a valid work around for this?
CSS
nav {
width: 6rem;
position: sticky;
top: 0;
align-self: flex-end;
z-index: 5;
height: 100vh;
display: flex;
flex-direction: column;
align-items: center;
padding: 3.2rem;
/* padding-top: 3rem; */
}
.bubbs {
opacity: 0;
transition: opacity 400ms ease-in;
}
.bubbs > svg {
color: white;
font-size: 1.8rem;
margin-bottom: .5rem;
}
.bubbs-enter {
opacity: .7;
}
.bubbs-enter:hover{
opacity: 1;
border-left: 1px solid rgba(82, 82, 82, 0.246)
}
.bubble {
aspect-ratio: 1;
border: 1px solid rgba(74, 74, 74, 0.216);
width: 3.6rem;
border-radius: 50%;
display: grid;
place-items: center;
margin: .5rem 0;
backdrop-filter: blur(2px);
cursor: pointer;
background-color: rgba(28, 28, 28, 0.349);
transition: all ease 350ms;
}
.bubble:hover {
transform: scale(1.06);
}
.bubble p {
color: rgb(240, 240, 240);
margin: 0;
font-size: 1.3rem;
text-transform: capitalize;
transition: all ease 550ms;
}
.bubble-active {
background-color: rgb(255, 255, 255);
transform: scale(1.06);
}
.bubble-active > p {
color: red;
}

What you're trying to achieve is a bit complex to achieve with CSS. You may want to take a look at setting the opacity of each child element than setting the opacity of the parent.
Take a look at the answers in this thread

CSS Navbar Transition is Smooth on Scroll Down but no Transition at all on Scroll Back Up

I am currently working on a website with a navigation bar at the top of the screen that is initially transparent when you first visit the site, but turns into a white bar with black text the moment you start scrolling down. It also shrinks a little. It has a really nice and smooth transition as it changes it's color and shrinks, but when you scroll back to the top of the page, there is no more smooth transition but rather an instant ugly transition. Actually the changing of the color back to transparent seems okay but the resize of the bar lacks the transition. I uploaded a GIF so you can see exactly what's the problem.
There is a second problem I would like to ask for. As you can see in the GIF, there is an underline animation on text hover, however, I cannot get it to work on the white navbar. I want that underline to become black, just like the text and shrink with the rest of the navbar.
Here is the GIF:
https://media.giphy.com/media/5jYbvzN9OzaVm3IRE6/giphy.gif
Also the CSS:
/* -=-=-=-=-= FONT IMPLEMENTATION =-=-=-=-=- */
#import url('https://fonts.googleapis.com/css?family=Quicksand:300|Roboto:100');
/* -=-=-=-= END FONT IMPLEMENTATION =-=-=-=- */
html, body {
margin: 0;
padding: 0;
width: 100%;
}
body {
font-family: "Roboto",sans-serif;
font-weight: lighter;
}
header.index {
width: 100%;
height: 100vh;
background: url(../res/images/back.png) no-repeat 50% 50%;
background-size: cover;
}
header.page1 {
width: 100%;
height: 100vh;
background: url(../res/images/test.jpg) no-repeat 50% 50%;
background-size: cover;
}
.content {
width: 94%;
margin: 4em auto;
font-size: 20px;
}
.logoimg {
position: fixed;
display: inline-block;
float: left;
width: 235px;
height:54px;
margin: 37px 80px;
transition: 0.5s ease-in-out;
}
nav {
position: fixed;
width: 100%;
line-height: 60px;
transition: 0.5s ease-in-out;
}
nav ul {
line-height: 100px;
list-style: none;
background: rgba(0, 0, 0, 0);
overflow: hidden;
color: #fff;
padding: 0;
text-align: right;
margin: 0;
padding-right: 50px;
transition: 0.5s ease-in-out;
}
nav ul li {
display: inline-block;
padding: 16px 20px;
transition: 0.5s ease-in-out;
}
nav ul li a {
text-decoration: none;
color: #fff;
font-size: 24px;
transition: 0.5s ease-in-out;
}
nav ul li a.current{
font-weight: 600;
}
nav.scrolled{
background: #fff;
min-height: 20px;
line-height: 40px;
transition: 0.5s ease-in-out;
}
nav.scrolled ul li a{
text-decoration: none;
color: #000;
font-size: 20px;
line-height: 40px;
transition: 0.5s ease-in-out;
}
nav.scrolled img{
width: 180px;
height: 41px;
margin: 27px 80px;
transition: 0.5s ease-in-out;
}
/* -=-=-=-=-= MENU ITEM HOVER ANIMATION =-=-=-=-=- */
.menu a {
transition: color 0.1s, background-color 0.1s;
}
.menu a {
position: relative;
display: block;
transition: color 0.1s,background-color 0.1s,padding 0.2s ease-in;
color: #fff;
}
.menu a::before {
content: '';
display: block;
position: absolute;
bottom: 24px;
left: 0;
height: 2px;
width: 100%;
background-color: #fff;
transform-origin: right top;
transform: scale(0, 1);
transition: color 0.1s,transform 0.2s ease-out;
}
.menu a:active::before {
background-color: #fff;
}
.menu a:hover::before, a:focus::before {
transform-origin: left top;
transform: scale(1, 1);
}
.menu.scrolled {
color: #000;
background-color:
}
/* -=-=-=-=-= END MENU ITEM HOVER ANIMATION =-=-=-=-=- */
And the JS:
$(window).on("scroll", function() {
if($(window).scrollTop()) {
$('nav').addClass('scrolled');
}
else {
$('nav').removeClass('scrolled');
}
})
$(function () {
$(window).scroll(function () {
if ($(this).scrollTop()> 2) {
$('.logo img').attr('src', 'res/logos/main.png');
}
if ($(this).scrollTop() < 2) {
$('.logo img').attr('src', 'res/logos/main_light.png');
}
});
});
And the important HTML:
<header class="index">
<nav class="navbar">
<div class="logo">
<a href="#">
<img class="logoimg" src="res/logos/main_light.png">
</a>
</div>
<div class="menu">
<ul>
<li><a class="current" href="index.html">Home</a></li>
<li>Company</li>
<li>Services</li>
<li>Portfolio</li>
<li>Blog</li>
<li>Contact</li>
</ul>
</div>
</nav>
</header>
Note that .scrolled is the one that changes the navbar once you scrolled. May your road lead you to warm sands!

You're setting the transition for the a elements twice. First as .menu a and then as nav ul li a. The nav bar animates when scrolling up, but the transition lasts 0.1s, as declared for the selector .menu a.
You can either change .menu a to .menu nav ul li a or redesign your classes.
For the underline animation, just add the nav.scrolled selector to the classes you already have, for instance: nav.scrolled .menu a::before and change the background color. You will probably also need to re position the ::before element.

Make sidebar fadein on scroll point

Been researching some way to make my side navigation bar fadein on a specific area of my website. Just not sure how to go about it. I found some jquery that is around the problem. But being new to the stuff im not sure how to implement it into my specific code.
The example given is
if ($(window).scrollTop() >= "number of pixels") {
if ($('"button plus number"').css('display') === 'none') {
$('"button plus number"').fadeIn('slow');
$('"button plus number"').prev().fadeOut();
$('"button plus number"').next().fadeOut();
}
}
So basically with my code I am wanting is to get .cbp-fbscroller to fade in or at least appear at about 900px. Also once i get an understanding of how it works I could then use the code to make other things fade in on scroll points as well.
Here is a basic fiddle so you guys can get the idea http://jsfiddle.net/vLf18Lbk/
HTML area for fadein:
<div class="main">
<div id="cbp-fbscroller" class="cbp-fbscroller">
<nav>
Section 1
Section 2
Section 3
Section 4
Section 5
</nav>
<section id="fbsection1"></section>
<section id="fbsection2"></section>
<section id="fbsection3"></section>
<section id="fbsection4"></section>
<section id="fbsection5"></section>
</div>
</div>
CSS needing to fade in:
/* The nav is fixed on the right side and we center it by translating it 50%
(we don't know it's height so we can't use the negative margin trick) */
.cbp-fbscroller > nav {
position: fixed;
z-index: 9999;
right: 100px;
top: 50%;
width: 26px;
-webkit-transform: translateY(-50%);
-moz-transform: translateY(-50%);
-ms-transform: translateY(-50%);
transform: translateY(-50%);
}

your jQuery code is correct.
when you scroll to bottom more than 250px fade in "go to top", in other wise fade out "go to top"
you can check line 41 of javascript
$(document).ready(function () {
$(document).on("scroll", onScroll);
//smoothscroll
$('a[href^="#"]').on('click', function (e) {
e.preventDefault();
$(document).off("scroll");
$('a').each(function () {
$(this).removeClass('active');
})
$(this).addClass('active');
var target = this.hash,
menu = target;
$target = $(target);
$('html, body').stop().animate({
'scrollTop': $target.offset().top+2
}, 500, 'swing', function () {
window.location.hash = target;
$(document).on("scroll", onScroll);
});
});
});
function onScroll(event){
var scrollPos = $(document).scrollTop();
$('#menu-center a').each(function () {
var currLink = $(this);
var refElement = $(currLink.attr("href"));
if (refElement.position().top <= scrollPos && refElement.position().top + refElement.height() > scrollPos) {
$('#menu-center ul li a').removeClass("active");
currLink.addClass("active");
}
else{
currLink.removeClass("active");
}
});
}
///// edit go to top
$(window).scroll(function() {
if ($(this).scrollTop() > (250)) {
$("#top").fadeIn('fast');
} else{
$("#top").fadeOut('fast');
};
});
$("a[href='gototop']").click(function() {
$("html, body").animate({ scrollTop: 0 }, "slow");
return false;
});
body, html {
margin: 0;
padding: 0;
height: 100%;
width: 100%;
}
.menu {
width: 100%;
height: 75px;
background-color: rgba(0, 0, 0, 1);
position: fixed;
background-color:rgba(4, 180, 49, 0.6);
-webkit-transition: all 0.3s ease;
-moz-transition: all 0.3s ease;
-o-transition: all 0.3s ease;
transition: all 0.3s ease;
}
.light-menu {
width: 100%;
height: 75px;
background-color: rgba(255, 255, 255, 1);
position: fixed;
background-color:rgba(4, 180, 49, 0.6);
-webkit-transition: all 0.3s ease;
-moz-transition: all 0.3s ease;
-o-transition: all 0.3s ease;
transition: all 0.3s ease;
}
#menu-center {
width: 980px;
height: 75px;
margin: 0 auto;
}
#menu-center ul {
margin: 15px 0 0 0;
}
#menu-center ul li {
list-style: none;
margin: 0 30px 0 0;
display: inline;
}
.active {
font-family:'Droid Sans', serif;
font-size: 14px;
color: #fff;
text-decoration: none;
line-height: 50px;
}
a {
font-family:'Droid Sans', serif;
font-size: 14px;
color: black;
text-decoration: none;
line-height: 50px;
}
#home {
background-color: grey;
height: 100%;
width: 100%;
overflow: hidden;
background-image: url(images/home-bg2.png);
}
#portfolio {
background-image: url(images/portfolio-bg.png);
height: 100%;
width: 100%;
}
#about {
background-color: blue;
height: 100%;
width: 100%;
}
#contact {
background-color: red;
height: 100%;
width: 100%;
}
#top{
position: fixed;
bottom: 5px;
right: 5px;
background-color: #ffff00;
cursor: pointer;
display: none;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<div class="m1 menu">
<div id="menu-center">
<ul>
<li><a class="active" href="#home">Home</a>
</li>
<li>Portfolio
</li>
<li>About
</li>
<li>Contact
</li>
</ul>
</div>
</div>
<div id="home"></div>
<div id="portfolio"></div>
<div id="about"></div>
<div id="contact"></div>
go to top
In the same way you can select each tag fade or appearance.

readmore button or show/hide for php

I want to show only e.g. 200 words from post with show/hide button to show whole post and hide post to 200 words.
Text is on variable I don't know how to do this.
I tried with javascript but I can't hide content of post.
here's the:
<div id="test">content</div>
<script>
var str = "<?=$row[3]?>";
var test = str.substr(0, 700);
document.getElementById('test').innerHTML = test;
</script>
<p id="demo"></p>
<script>
function myFunction() {
var str = "<?=$row[3]?>";
var test = str.substr(700);
document.getElementById("demo").innerHTML = test;
}
</script>
<button onclick="myFunction()">Click me</button>

You can do that in simple css
Don't need any other
hide your overflow text
modify code in css according to your need
/* css only show/hide
*/
html { background: white }
* {
margin: 0;
padding: 0;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
-ms-box-sizing: border-box;
box-sizing: border-box;
}
figure {
margin: 0 0 1.3rem 0;
-webkit-transition: .125s linear;
-moz-transition: .125s linear;
-ms-transition: .125s linear;
-o-transition: .125s linear;
transition: .125s linear;
}
figure img {
max-width: 100%;
height: auto;
}
body {
max-width: 480px;
width: 90%;
margin: 3em auto;
font-size: 75%;
line-height: 1.3rem;
font-family: sans-serif;
position: relative;
*zoom: 1;
}
body:before, body:after {
content: "";
display: table;
}
body:after { clear: both }
p { margin-bottom: 1.3rem }
article {
margin-bottom: 3rem;
position: relative;
*zoom: 1;
}
article:before, article:after {
content: "";
display: table;
}
article:after { clear: both }
article figure {
float: left;
width: 32.5%;
}
article section:first-of-type {
float: right;
width: 62.5%;
}
article section:last-of-type {
display: none;
visibility: hidden;
}
section {
-webkit-transition: .125s linear;
-moz-transition: .125s linear;
-ms-transition: .125s linear;
-o-transition: .125s linear;
transition: .125s linear;
}
input[type=checkbox] {
border: 0;
clip: rect(0 0 0 0);
height: 1px;
width: 1px;
margin: -1px;
overflow: hidden;
padding: 0;
position: absolute;
}
[for="read_more"] {
position: absolute;
bottom: -3rem;
left: 0;
width: 100%;
text-align: center;
padding: .65rem;
box-shadow: inset 1px 1px rgba(0, 0, 0, 0.1), inset -1px -1px rgba(0, 0, 0, 0.1);
}
[for="read_more"]:hover {
background: rgba(0,0,0,.5);
color: rgb(255,255,255);
}
[for="read_more"] span:last-of-type {
display: none;
visibility: hidden;
}
input[type=checkbox]:checked ~ section {
display: block;
visibility: visible;
width: 100%;
}
input[type=checkbox]:checked ~ figure { width: 100% }
input[type=checkbox]:checked ~ [for="read_more"] span:first-of-type {
display: none;
visibility: hidden;
}
input[type=checkbox]:checked ~ [for="read_more"] span:last-of-type {
display: block;
visibility: visible;
}
<article>
<input type="checkbox" id="read_more" role="button">
<label for="read_more" onclick=""><span>Read More</span><span>Hide This Shit!</span></label>
<figure>
<img src="http://www.surprisegiftz.com/images/media/ceramicphototiles.jpg" alt="Example text" />
</figure>
<section>
<p>The function of a paragraph is to mark a pause, setting the paragraph apart from what precedes it. If a paragraph is preceded by a title or subhead, the indent is superfluous and can therefore be omitted</p>
</section>
<section>
<p>The function of a paragraph is to mark a pause, setting the paragraph apart from what precedes it. If a paragraph is preceded by a title or subhead, the indent is superfluous and can therefore be omitted</p>
<p>The function of a paragraph is to mark a pause, setting the paragraph apart from what precedes it. If a paragraph is preceded by a title or subhead, the indent is superfluous and can therefore be omitted</p>
</section>
</article>

You dont need to add two seperate elements for short and full content. Just make a hyperlink which will call a script to show hide full and short content.
use below html
<div id="test">content</div>
<div >
<a href="#" id="showmore" onClick="return showMore(this);" >more</a>
</div>
and below script for it
var str = "<?=$row[3]?>";
var test = str.substr(0, 200);
document.getElementById('test').innerHTML = test;
function showMore(obj){
if(obj.text == 'more'){
document.getElementById('test').innerHTML = str;
obj.text = "less";
}else{
document.getElementById('test').innerHTML = test;
obj.text = "more";
}
}
hope it will help