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Adding and removing class at div top?

I am trying to make a class fade in when 'register' class div top enters the window and otherwise have the class fade out
How can I make this work?
$(window).scroll(function() {
var tint = $('.register').offset().top;
if ($(this).scrollTop() > tint) {
$('.tint').fadeIn(1000);
} else {
$('.tint').fadeOut(1000);
}
});
section {
height: 100vh;
width: 100%;
}
.tint {
background-color: #000;
width: 100%;
height: 100vh;
opacity: 0.6;
position: absolute;
top: 0;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<section></section>
<section class="register">
<div class="tint"></div>
<div>Content</div>
</section>

Class example code you posted seems to work correctly, I think you should check css also if there is any problem. But if want any other methods then here are some methods: you can use fadIn() - fadeOut(), or hide() - show() or css visibility or display block and none , or simply can jquery UI animate functionality. Here is animation example to hide div jquery animate
$(window).scroll(function() {
var top_of_element = $("#element").offset().top;
var bottom_of_element = $("#element").offset().top + $("#element").outerHeight();
var bottom_of_screen = $(window).scrollTop() + $(window).innerHeight();
var top_of_screen = $(window).scrollTop();
if ((bottom_of_screen > top_of_element) && (top_of_screen < bottom_of_element)){
// the element is visible, do something
} else {
// the element is not visible, do something else
}
});
$(window).scroll(function() {
var tint = $('.register').offset().top;
if ($(this).scrollTop() > tint) {
$('.register').fadeIn();
// OR
//$(".register").show();
// OR
//$(".register").css('visibility', 'visible');
} else {
$('.register').fadeOut();
// OR
//$(".register").hide();
// OR
//$(".register").css('visibility', 'hidden');
}
});
.tint {
background-color: #000;
width: 100%;
height: 100vh;
opacity: 0.6;
position: absolute;
top: 0;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<section class="register">
<div class="tint"></div>
<div>Content</div>
</section>

The only problem, that you've passed a string to fadeOut, which expects a number.
So, remove the quotes around '1000', and you'll be right:
$(window).scroll(function() {
var tint = $('.register').offset().top;
if ($(this).scrollTop() > tint) {
$('.tint').fadeIn(1000);
} else {
$('.tint').fadeOut(1000);
}
});
section {
height: 100vh;
width: 100%;
}
.tint {
background-color: #000;
width: 100%;
height: 100vh;
opacity: 0.6;
position: absolute;
top: 0;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<section></section>
<section class="register">
<div class="tint"></div>
<div>Content</div>
</section>

Customizing jQuery scrolling effect

I'm working on a website where I have made a simple scrolling effect using jQuery. Basically, I just have the page scroll to a specified section when the user clicks on one of the navigation links. I would like to customize this so that the header (which I'm using as my scrolling target) is not at the very top of the page. I want it more in the middle. Does anybody know how I can easily customize this? Below is my jQuery code.
jQuery Scroll effect
$('a[href*="#"]').on('click', function(e) {
e.preventDefault()
$('html, body').animate(
{
scrollTop: $($(this).attr('href')).offset().top,
},
500,
'linear'
)
});
Thank you!

The key is to calculate the offset, Try this:
$('a[href*="#"]').on('click', function(e) {
e.preventDefault()
var id = $(this).attr('href');
var $element = $(id);
var elementHeight = $element.height();
var winHeight = $(window).height();
var offset;
if(elementHeight >= winHeight) //if element height > window height, just put the element to top place.
{
offset = 0;
}
else // else make it to the middle place of window.
{
offset = Math.round((elementHeight - winHeight) / 2);
}
$('html, body').animate(
{
scrollTop: $element.offset().top + offset,
},
500,
'linear'
)
});
body, html {
padding: 0;
margin: 0;
}
.nav-wrap {
width: 100vw;
position: fixed;
background: rgba(0,0,0,0.5);
padding: 10px;
}
.nav-wrap > a {
color: #ffffff !important;
padding: 10px;
}
section {
display: block;
width: 100vw;
}
#id1 {
background: #ff0000;
height: 50vh;
}
#id2 {
background: #00ff00;
height: 80vh;
}
#id3 {
background: #ffff00;
height: 120vh;
}
#id4 {
background: #0000ff;
height: 30vh;
}
#id5 {
background: #000000;
height: 60vh;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="nav-wrap">
ID1
ID2
ID3
ID4
ID5
</div>
<div class="section-wrap">
<section id="id1"></section>
<section id="id2"></section>
<section id="id3"></section>
<section id="id4"></section>
<section id="id5"></section>
</div>

Two conditions for scroll offset and element

What I trying to do is, show .box-tocart when scroll top bigger than .product-info-main offset top and also if reached to .page-footer should hide but I couldn't mix these conditions together, each condition work separately but not working together with || or &&
var target = $('.product-info-main').offset().top;
$(window).scroll(function() {
var footer = $('.page-footer').offset().top;
var element = $('.box-tocart').offset().top;
if (($(window).scrollTop() >= target) || (element >= footer)) {
$('.box-tocart').show();
} else {
$('.box-tocart').hide();
}
});
body {
height: 2000px;
}
#nothing {
height: 100px;
background: red;
}
.product-info-main {
height: 1000px;
}
.box-tocart {
height: 30px;
background: green;
display: none;
position: fixed;
bottom: 0;
left: 0;
width: 100%;
}
.page-footer {
background: blue;
height: 100px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="nothing"></div>
<div class="product-info-main">
<div class="box-tocart"></div>
</div>
<div class="page-footer"></div>
Goal: show .box-tocart if scroll top bigger than .product-info-main offset top, else hide. Also if reached to .page-footer hide, else show, but I want these two conditions together, but couldn't make it work.
The problem with current snippet is, it not hide .box-tocart after reach .page-footer
Simple explanation: green div should show after red div, else hide and should hide after
reach to blue div else hide.

You need to change the condition to:
var scrollTop = $(window).scrollTop();
var windowHeight = $(window).height();
if ((scrollTop >= target) && (scrollTop + windowHeight <= footer)) {
// ...
}
Updated example:
var target = $('.product-info-main').offset().top;
$(window).scroll(function() {
var footer = $('.page-footer').offset().top;
var element = $('.box-tocart').offset().top;
var scrollTop = $(window).scrollTop();
var windowHeight = $(window).height();
if ((scrollTop >= target) && (scrollTop + windowHeight <= footer)) {
$('.box-tocart').show();
} else {
$('.box-tocart').hide();
}
});
body {
height: 2000px;
}
#nothing {
height: 100px;
background: red;
}
.product-info-main {
height: 1000px;
}
.box-tocart {
height: 30px;
background: green;
display: none;
position: fixed;
bottom: 0;
left: 0;
width: 100%;
}
.page-footer {
background: blue;
height: 100px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="nothing"></div>
<div class="product-info-main">
<div class="box-tocart"></div>
</div>
<div class="page-footer"></div>

You should use $(window).scrollTop() instead of element so your OR condition should be like if (... || $(window).scrollTop() >= footer, that’s because the scroll position is all relative to the window view and not to the cart box
I hope it can help you.

Multiple Window Events - Jquery

I'm trying to write a function that watches the window for a few things:
If the window is greater-than 900px and the window is scrolled passed 100 add a BG color to the nav
If the nav is scrolled passed 100 and the window is resized to less-than 900px change the BG color nav.
I've written two functions that should be doing the trick. My problem is my functions work right up until you scroll passed 100 and resize the screen: they won't apply the second class with the second bg color.
Snippet below. Can anyone provide assistance?
$(document).ready(function() {
$(window).scroll(function() {
var scroll = $(window).scrollTop();
var nav = $('nav');
if( scroll > 100 ) {
nav.addClass('scrolled');
} else {
nav.removeClass('scrolled');
}
});
$(window).resize(function() {
var mq = window.matchMedia('(min-width: 100px) and (max-width: 900px)');
if( mq.matches && $('nav').hasClass('scrolled')) {
$('nav').removeClass('scrolled');
console.log("Working");
$('nav').addClass('scrolledTwo');
} else {
console.log("Not working");
$('nav').removeClass('scrolledTwo');
}
});
});
* {
padding: 0;
margin: 0;
}
nav {
height: 70px;
width: 100%;
border: 1px solid;
transition: all .2s ease;
background-color: transparent;
position: fixed;
top: 0;
left: 0;
z-index: 1000;
}
.nav-fixedWidth {
height: inherit;
width: 1000px;
margin: 0 auto;
border: 1px solid #ccc;
}
main {
width: 100%;
height: 2000px;
border: 1px solid;
background-color: #f1f1f1;
}
.scrolled {
background-color: red;
}
.scrolledTwo {
background-color: blue;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<nav>
<div class="nav-fixedWidth"></div>
</nav>
<main></main>

Your code is working fine it is even applying the second class with the second bg color if you will resize slowly your window. The only issue is this if( mq.matches && $('nav').hasClass('scrolled')) condition. As you have mentioned $('nav').hasClass('scrolled') so first time when you will resize it will be true and then
$('nav').removeClass('scrolled');
console.log("Working");
$('nav').addClass('scrolledTwo');
this will apply scrolledTwo class to nav. After that when you will further resize it will never pass this if( mq.matches && $('nav').hasClass('scrolled')) condition, until you don't resize the screen width to less than 100px or greater than 900px and scroll, and will always goto else and you will always see the red color. Try removing it
$(document).ready(function() {
$(window).scroll(function() {
var scroll = $(window).scrollTop();
var nav = $('nav');
if( scroll > 100 ) {
nav.addClass('scrolled');
} else {
nav.removeClass('scrolled');
}
});
$(window).resize(function() {
var mq = window.matchMedia('(min-width: 100px) and (max-width: 900px)');
if( mq.matches ) {
$('nav').removeClass('scrolled');
console.log("Working");
$('nav').addClass('scrolledTwo');
} else {
console.log("Not working");
$('nav').removeClass('scrolledTwo');
}
});
});
* {
padding: 0;
margin: 0;
}
nav {
height: 70px;
width: 100%;
border: 1px solid;
transition: all .2s ease;
background-color: transparent;
position: fixed;
top: 0;
left: 0;
z-index: 1000;
}
.nav-fixedWidth {
height: inherit;
width: 1000px;
margin: 0 auto;
border: 1px solid #ccc;
}
main {
width: 100%;
height: 2000px;
border: 1px solid;
background-color: #f1f1f1;
}
.scrolled {
background-color: red;
}
.scrolledTwo {
background-color: blue;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<nav>
<div class="nav-fixedWidth"></div>
</nav>
<main></main>
Another issue in your code is if I scroll and resize the screen width between 100 to 900 and then again resize it to out of this window then there is no class assigned to your div and that is due to no class added in else of resize function. Changing that to this will do that trick also :)
else {
console.log("Not working");
$('nav').removeClass('scrolledTwo');
var scroll = $(window).scrollTop();
if( scroll > 100 ) {
$('nav').addClass('scrolled');
}
}

show different header on scroll then hide it when scrolled to the top javascript/JQuery

This is driving me insane because i had it working and now it's not, i have 2 headers and when the page loads i want one to be hidden which is easy enough then as soon as the user scrolls i want the other header to show over it and then when they scroll back to the top the original header shows.
i think there is an issue with the window.pageyoffset because what ever i put inside this if statement it doesn't execute..
<script>
var secondHeader = $('.headerN').hide();
function testScroll(){
if(window.pageYOffset>50){
secondHeader.fadeIn();
}
else if(window.pageYOffset == 0){
secondHeader.fadeOut();
}
}
window.onscroll=testScroll;

This is what you need:
$("#header-scroll").hide();
$(window).scroll(function() {
if ($(this).scrollTop() > 10) {
$('#header-scroll').slideDown(500);
$('#header-full').slideUp(500);
} else {
$('#header-scroll').slideUp(500);
$('#header-full').slideDown(500);
}
});
.header {
border: 2px #3a3a3a solid;
width: 97%;
position: fixed;
text-align:center;
color: #3a3a3a;
top: 0px;
}
#header-full {
height: 100px;
background-color: #FFF056;
font-size:72px;
}
#header-scroll {
height: 50px;
background-color: #CBE32D;
font-size:28px;
}
#content {
height: 600px;
width: 97%;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="header-full" class="header">
Full Header
</div>
<div id="header-scroll" class="header">
Scroll Header
</div>
<div id="content"></div>

Try using below code.
$(window).scroll(function () {
if ($(this).scrollTop() > 50) {
$('.headerN').fadeIn();
} else {
$('.headerN').fadeOut();
}
});