I'm trying to add/remove a class to the sticky header, when this reaches a specific section with a class "dark-section", but i want to do it automaticly if there are 2 or more section with the same class.
jQuery(function ($) {
'use strict';
var Header = $('.header');
function HeaderDarkMode() {
var scrollTop = $(window).scrollTop(),
dark = $('.dark-section');
dark.length && dark.each(function () {
var top = $(this).position().top,
height = $(this).outerHeight(),
bottom = top + height;
scrollTop >= top - 45 && scrollTop < bottom - 45 ? Header.addClass('dark') : Header.removeClass('dark');
});
}
$(window).scroll(function() {
HeaderDarkMode();
});
});
body{
margin: 0;
padding: 0;
}
header{
background: gray;
opacity: .5;
min-height: 90px;
position: sticky;
top: 0;
width: 100%
}
header.dark{
background: red;
}
section{
min-height: 800px;
}
section.dark-section{
background: black;:
}
footer{
min-height: 300px;
backgroud-color: #f1f1f1;
}
<html>
<head>
<title>Dark Header Test</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
</head>
<body>
<header class="header"></header>
<section></section>
<section class="dark-section"></section>
<section></section>
<section class="dark-section"></section>
<section></section>
<section class="dark-section"></section>
<section></section>
<footer></footer>
</body>
</html>
This is my code i'm working on, but it seems that only work with the last selector founded.
Help.
The problem you are facing is that when you cycle over all .dark-sections in your code and add or remove .dark from the header, you always end up with the last iteration's result. If you are over the second dark section, it correctly adds the class, but then it has to calculate if you happen to be over the third dark section, which you are not because you are only over the second one, so it removes the class again. You need to change this calculation so that either it stop on match, or you use flags. Since your code uses jQuery, I will go with the later option:
// use a variable to keep track of state
var isOverAnyDarkSection = false
dark.each(function () {
var top = $(this).position().top,
height = $(this).outerHeight(),
bottom = top + height;
if (scrollTop >= top - 45 && scrollTop < bottom - 45) {
// set the flag to true the header is over any dark section
isOverAnyDarkSection = true
}
});
// finally, only now decide if the class should be added or removed
if (isOverAnyDarkSection) {
Header.addClass('dark')
} else {
Header.removeClass('dark')
}
This way, the class is only added or removed once based on the state.
Code ended like this
Thanks to #Jakub-Kotrs
jQuery(function ($) {
'use strict';
var Header = $('.header');
function HeaderDarkMode() {
var scrollTop = $(window).scrollTop(),
dark = $('.dark-section');
// use a variable to keep track of state
var isOverAnyDarkSection = false
dark.each(function () {
var top = $(this).position().top,
height = $(this).outerHeight(),
bottom = top + height;
if (scrollTop >= top - 45 && scrollTop < bottom - 45) {
// set the flag to true the header is over any dark section
isOverAnyDarkSection = true
}
});
// finally, only now decide if the class should be added or removed
if (isOverAnyDarkSection) {
Header.addClass('dark')
} else {
Header.removeClass('dark')
}
}
$(window).scroll(function() {
HeaderDarkMode();
});
});
body{
margin: 0;
padding: 0;
}
.header{
background: gray;
opacity: .5;
min-height: 90px;
position: sticky;
top: 0;
width: 100%
}
.header.dark{
background: red;
}
section{
min-height: 800px;
}
.dark-section{
background: black;:
}
<html>
<head>
<title>Dark Header Test</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
</head>
<body>
<header class="header"></header>
<section></section>
<section class="dark-section"></section>
<section></section>
<section class="dark-section"></section>
<section></section>
<section class="dark-section"></section>
<section></section>
<footer></footer>
</body>
</html>
Related
I have a search bar which would like to display onto the header on scroll, a great example is like the one on this site: https://www.indiamart.com/
Approach 1 - A simple way to do this would be to detect a scroll & add and remove a class that contains display: none;
You can have an event listener -
window.addEventListener('scroll', function() {
if( window.scrollY !== 0) {
document.getElementById('searchBar').classList.add('scrolled');
} else {
document.getElementById('searchBar').classList.remove('scrolled');
}
});
With the CSS -
.noScroll
{
background: yellow;
position:fixed;
height: 50px; /*Whatever you want*/
width: 100%; /*Whatever you want*/
top:0;
left:0;
display:none;
}
/*Use this class when you want your content to be shown after some scroll*/
.scrolled
{
display: block !important;
}
.parent {
/* something to ensure that the parent container is scrollable */
height: 200vh;
}
And the html would be -
<div class="parent">
<div class ='noScroll' id='searchBar'>Content you want to show on scroll</div>
</div>
Here's a JSFiddle of the same - https://jsfiddle.net/kecnrh3g/
Approach 2 -
Another simple approach would be
<script>
let prevScrollpos = window.pageYOffset;
window.onscroll = function() {
let currentScrollPos = window.pageYOffset;
if (prevScrollpos > currentScrollPos) {
document.getElementById('searchBar').style.top = '-50px';
} else {
document.getElementById('searchBar').style.top = '0';
}
prevScrollpos = currentScrollPos;
}
</script>
with the html -
<div class="parent">
<div id ='searchBar'>Content you want to show on scroll</div>
</div>
and css
#searchBar {
background: yellow;
position: fixed;
top: 0;
left: 0;
height: 50px;
width: 100%;
display: block;
transition: top 0.3s;
}
.parent {
height: 200vh;
}
Here's a JSFiddle of the same - https://jsfiddle.net/0tkedcns/1/
From the same example, the idea is only to show/hide once user scroll the page using inline css display property, you can do the same or at least provide a code sample so we can help you!
HTML
<div class="search-bar">
<div class="sticky-search">
Sticky Search: <input type="text" value="search" />
</div>
</div>
CSS
.sticky-search {
display:none;
position:fixed;
top:0px;
left:0px;
right:0px;
background:blue;
padding:10px;
}
JS
var searchHeight = $(".search-bar").outerHeight();
var offset = $(".search-bar").offset().top;
var totalHeight = searchHeight + offset;
console.log(totalHeight);
$(window).scroll(function(){
if($(document).scrollTop() >= totalHeight) {
$('.sticky-search').show();
} else {
$('.sticky-search').hide();
}
});
I've got a header that I want to disappear (move above the top of the browser screen) when the user scrolls down, then when the user scrolls back up I want the header to reappear (move back down) and also to gain a solid white background behind it.
All of this is working fine, but then I want the white background to be removed if the user scrolls back up to the very top of the page again (so it's just the header visible but with no white background).
I've cobbled together the code for this, and it's pretty much working - but, for some reason, in certain circumstances, the white background isn't being removed?!
It seems to be if you've scrolled back up enough to make the header reappear with the white background, but not all the way top the top, and then scroll the rest of the way then the white background doesn't disappear for some reason.
Sorry, I've probably not explained that very well, but here's my code. If someone is able to replicate the bug I'm getting and offer an explanation I'd be very grateful!
Thanks
// Hide Header on on scroll down
var didScroll;
var lastScrollTop = 0;
var delta = 30;
var navbarHeight = $('header').outerHeight();
$(window).scroll(function(event){
didScroll = true;
});
setInterval(function() {
if (didScroll) {
hasScrolled();
didScroll = false;
}
}, 30);
function hasScrolled() {
var st = $(this).scrollTop();
// Make sure they scroll more than delta
if(Math.abs(lastScrollTop - st) <= delta)
return;
// If they scrolled down and are past the navbar, add class .nav-up.
// This is necessary so you never see what is "behind" the navbar.
if (st > lastScrollTop && st > navbarHeight){
// Scroll Down
$('header').removeClass('header-down').addClass('header-up').removeClass('header-solid');
} else {
// Scroll Up
if(st + $(window).height() < $(document).height()) {
$('header').removeClass('header-up').addClass('header-down').addClass('header-solid');
}
}
lastScrollTop = st;
};
$(function () {
$(window).scroll(function () {
var top_offset = $(window).scrollTop();
if (top_offset == 0) {
$('header').removeClass('header-solid');
}
})
});
body {
margin: 0;
background: url('https://images.unsplash.com/3/doctype-hi-res.jpg?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=2246&q=80');
background-size: cover;
}
.wrapper {
width: 100%;
height: 3000px;
}
header {
display: flex;
width: 100%;
padding: 20px 50px;
position: fixed;
box-sizing: border-box;
transition: 300ms all ease-in-out;
margin-top: 0px;
}
.header-logo {
width: 200px;
}
.header-nav {
flex-grow: 1;
text-align: center;
}
.header-socials {
width: 200px;
text-align: right;
}
.header-up {
margin-top: -60px;
}
.header-down {
margin-top: 0px;
}
.header-solid {
background-color: #FFFFFF;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="wrapper">
<header class="header-down">
<div class="header-logo">
<img src="#" class="img-header-logo"/>
</div>
<div class="header-nav">
One Two Three Four Five
</div>
<div class="header-socials">
Social Links
</div>
</header>
</div>
I am using this for my header that changes in a one page scroll up and down page. I noticed that it's not responsive so i am asking you if you maybe know a way to make that responsive. Like changing the 0-690 into a percentage so that it will work on mobile and also on a tv screen.
HTML
<div class="header header-1" data-visible-range="0-690">Portfolio</div>
<div class="header header-2" data-visible-range="691-2100">Services</div>
<div class="header header-3" data-visible-range="2101-">Contact</div>
CSS
.header-1 {
background-color:dimgray;
display: block;
}
.header-2 {
background-color:dimgray;
}
.header-3 {
background-color:dimgray;
}
.header {
position: fixed;
top: 0;
left: 0;
height:8vmax;
width: 100%;
display: none;
visibility:hidden;
transition: visibility .4s, opacity .4s ease-in-out;opacity:0;
font-size:4vmax;padding:1.58vmax;color:white;
}
What if, instead of basing it off pixels, you just checked to see if an element hit the top of the page, and then changed the header?
We'll call these elements "triggers." See my code below for an example of how they work.
let updateHeader = () => {
let scrollTop = $(window).scrollTop(),
triggerTitle = "Hi";
$('.trigger').each((i, el) => {
let topPos = $(el).offset().top,
distance = topPos - scrollTop;
if (distance < 0)
triggerTitle = $(el).data('title');
});
$('header h2').text(triggerTitle);
}
$(window).scroll(updateHeader);
$(window).on('touchmove', updateHeader);
body {
margin: 0;
}
#container {
height: 1000px;
}
header {
width: 100%;
position: fixed;
top: 0;
background-color: red;
}
p {
margin: 200px 10px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="container">
<header><h2>Hi</h2></header>
<p class="trigger" data-title="section1">
trigger1
</p>
<p class="trigger" data-title="section2">
trigger2
</p>
<p class="trigger" data-title="section3">
trigger3
</p>
</div>
As you scroll down the page, each trigger hits the top of the page, and the text in the header will change to the the value of the latest trigger's data-title. You could position these triggers appropriately above each of your website's sections, so that, no matter what size the screen, the header should update at the right time. Here's a codepen.
EDIT
Try this JS instead for maximum compatibility (no es6 involved).
function updateHeader() {
var scrollTop = $(window).scrollTop(),
triggerTitle = "Hi";
$('.trigger').each(function(i, el) {
var topPos = $(el).offset().top,
distance = topPos - scrollTop;
if (distance < 0)
triggerTitle = $(el).data('title');
});
$('header h2').text(triggerTitle);
}
$(window).scroll(updateHeader);
$(window).on('touchmove', updateHeader);
I'm new and learning to code a website!
I'm trying to do this hover header that when the user scroll down, it will remain on the screen and when the user reaches Sub-Header 1, it will hover it too and changes if the user reaches Sub-Header 2(Sub-Header 1 will then disappear)
This is what I'm working on http://goo.gl/KqAM2R
Thanks in advance!
http://i.imgur.com/flT3oJ1.jpg
You need to use JavaScript to achieve this effect. SSCCE:
NewFile.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript" src="http://code.jquery.com/jquery-2.1.4.min.js"></script>
<script src="NewFile.js"></script>
<link rel="stylesheet" type="text/css" href="NewFile.css"></head>
<body>
<header class="fixed-top">Europe</header>
<div class="much-text">doge</div>
<header class="whatever1 doge">Heatwave</header>
<div class="much-text">doge</div>
<header class="whatever2 doge">2k15</header>
<div class="much-text">doge</div>
</body>
</html>
NewFile.js:
function isElementInViewport (el, topOrBottom) {
//special bonus for those using jQuery
if (typeof jQuery === "function" && el instanceof jQuery) {
el = el[0];
}
var rect = el.getBoundingClientRect();
if(topOrBottom == "top"){
return rect.top >= 0;
}else{
return rect.bottom <= $(window).height();
}
}
function onVisibilityChange () {
var headers = document.getElementsByClassName("doge");
var headerAbove = null;
for(i = 0; i<headers.length; i++){
$( headers[i]).css("position","");
$( headers[i]).css("top","");
if(!isElementInViewport(headers[i], "top")){
headerAbove = headers[i];
}
}
if(headerAbove != null){
$( headerAbove).css("position","fixed");
$( headerAbove).css("top","30px");
}
}
$(window).on('DOMContentLoaded load resize scroll', onVisibilityChange);
And NewFile.css
#CHARSET "UTF-8";
.fixed-top{
width:100%;
position:fixed;
top:0px;
background-color: red;
}
.whatever1{
width:100%;
background-color: green;
}
.whatever2{
width:100%;
background-color: blue;
}
.much-text{
height: 2000px;
}
.doge {
}
Thanks to authors of answers in How to tell if a DOM element is visible in the current viewport? for an inspiration. Also, I am aware that this code doesn't meet all good practices writing in js & css but OP clearly can find the idea from this one. Notice that you may need to sort headers (from the top header to the bottom header) in your own way before iterating on them in function onVisibilityChange
Try this...
HTML
<div id="page" class="page">
<div class="container">
<div class="contentheadercontainer">
<div class="fsh"><div class="firstheader">Sub header 1</div></div>
<div class="fsh"><div class="secondheader" id='secondheader'><p style='margin-left: 15px;'>Sub header 2</p></div></div>
</div>
</div>
</div>
</div>
CSS
body{
padding: 0px; margin: 0px;
}
.container{
height: 1000px;
}
.fsh{
position: absolute; width: 100%;
}
.firstheader{
height: 30px;width: 100%; position:fixed; background: #B14345; padding: 15px; color: #fff;
}
.secondheader{
border-top: 1px solid #bbb; padding: 5px 0px 5px 0px; margin-top: 300px; width: 100%; background: #B14345;color: #fff;
}
Javascript
document.addEventListener("scroll", function(){
scrollDetect();
});
function scrollDetect(){
var html = document.documentElement;
var top = (window.pageYOffset || html.scrollTop) - (html.clientTop || 0);
if(top > 235){
document.getElementById('secondheader').style.position = 'fixed';
document.getElementById('secondheader').style.marginTop = '60px';
document.getElementById('secondheader').style.width='100%';
}else{
document.getElementById('secondheader').style.position = 'inherit';
document.getElementById('secondheader').style.marginTop = '300px';
}
}
Check out this JSFiddle
I have 2 divs (one is fixed, the other one is relative)
I was implementing a scrolling behavior inside the fixed one ... scrolling along with the page. What i want to do more is when the div inside fixed one is scrolled to the bottom this should stop scrolling, only the page should continue scroll.
I do not know if i was very clear so that's why i create a fiddle.
<style>
body {
background-color:#dddddd;
margin: 0;
}
#mainDiv{
top: 120px;
max-width: 1024px;
margin:0px auto;
background-color:#fff;
}
#leftDiv{
width: 30%;
float: left;
background-color: #DBEAED;
height: 300px;
top: 1em;
z-index: 999;
position: fixed;
overflow: hidden;
}
#rightDiv{
width: 68%;
padding-left: 2%;
float: right;
background-color: #FBE9DD;
}
#filters{
display: inline-block;
}
</style>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script>
$(document).ready(function () {
window.onscroll = scrollFunction;
function scrollFunction() {
var doc = document.documentElement, body = document.body;
var top = (doc && doc.scrollTop || body && body.scrollTop || 0);;
$('#filters').css("margin-top", -top);
}
});
</script>
<div id="mainDiv">
<div id="leftDiv">
<div id="filters">
<p>XX 1</p><p>XX 2</p><p>XX 3</p><p>XX 4</p><p>XX 5</p><p>XX 6</p><p>XX 7</p><p>XX 8</p><p>XX 9</p><p>XX 10</p><p>XX 11</p><p>XX 12</p>
</div>
</div>
<div id="rightDiv">
Here is PLP page
<p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p>
<p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p>
<p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p>
</div>
</div>
Any help is more than welcome. Thanks !!!
ps. X12 should stick to the end of blue area.
If I undersand correctly, make it so that top has a maximum value of $('#filters').height()-$('#leftDiv').height(), which is as far as you want filters to scroll. Further, to make it be able to change directions gracefully, rather than set the margin of #filters equal to scroll top, we have to instead increment and decrement the value as we scroll
$(document).ready(function () {
window.onscroll = scrollFunction;
var filterMargin = 0;
maxTop = $('#filters').height() - $('#leftDiv').height();
lastTop = 0;
function scrollFunction() {
var doc = document.documentElement, body = document.body;
var top = (doc && doc.scrollTop || body && body.scrollTop || 0);
filterMargin = -parseInt($('#filters').css("margin-top"));
var diff = top - lastTop;
filterMargin += diff;
//make sure the margin value stops when the scrolling stops,
//otherwise the scrolling physically stops but the value keeps growing
filterMargin = filterMargin < 0 ? 0 : filterMargin;
filterMargin = filterMargin > maxTop ? maxTop : filterMargin;
console.log(top, maxTop, filterMargin, top - lastTop);
$('#filters').css("margin-top", -filterMargin + 'px');
lastTop = top;
}
});
Fiddle:
http://jsfiddle.net/nfp6fhg6/5/