Horizontal parallax effect to text on scroll - javascript

So I sort of got it working. I believe I am not understanding the javascript correctly.
I took this from another thread, however it isn't behaving quite the way I am trying to achieve. I see the variables are a math equation that bases the movement on the window height.
How can I manipulate the equation so that I can control "Some cool text."'s initial position (if you notice on load it takes the correct position, and then on scroll it gets moved by JS) to stay where I want it?
What controls the speed and intensity of the movement and how can I manipulate that?
I believe I am just not understanding the syntax that controls all these variables, can you point me in the right direction for some reading to understand these specific variables? Thank you. :D
https://jsfiddle.net/codingcrafter/kv9od1ju/22/
/* Custom Horizontal Scrolling Parallax */
.hero-two {
overflow: hidden;
position: relative;
min-height: 500px;
}
h1 {
-webkit-text-stroke-width: 0.1rem;
-webkit-text-stroke-color: black;
color: #fff;
font-family: 'Open Sans', Helvetica, Times New Roman !important;
font-weight: 900;
}
.para-ele {
position: absolute;
width: 100%;
font-size: 5rem;
}
#hero-first {
left: 75%;
top: 15%;
}
#hero-second {
left: -32%;
bottom: 10%;
}
.container {
position: relative;
box-sizing: border-box;
width: 100%;
height: 100%;
}
<div class="container">
<div class="hero-two">
<h1 id="hero-first" class="h1 para-ele">
Some cool text.
</h1>
<h1 id="hero-second" class="h1 para-ele">
Some boring text.
</h1>
</div>
</div>
$(document).ready(function() {
var $horizontal = $('#hero-first');
$(window).scroll(function() {
var s = $(this).scrollTop(),
d = $(document).height(),
c = $(this).height();
scrollPercent = (s / (d - c));
var position = (scrollPercent * ($(document).width() - $horizontal.width()));
$horizontal.css({
'left': position
});
});
});

So you want to move the text from left to right or right to left?
I have done something similar to your issue but I used jQuery to handle the scroll effect.
If you are going to use the code below you will need to wrap the text within a element with the class Introduction
As the page scrolls the element will append the styles dynamically to the element.
<h1 class="introduction">
WE ARE A <br><span class="d">DIGITAL</span><br>PARTNER
</h1>
$(window).scroll(function() {
var wScroll = $(this).scrollTop();
$(".introduction").css({
transform: "translateX(-" + wScroll / 23 + "%)"
})
});
Demo: https://guide-nancy-64871.netlify.com/
When page is scrolled the header text moves to the left.
Read more on css transform: https://css-tricks.com/almanac/properties/t/transform/
Hope this helps!

Related

How do I prevent scroll back up with JavaScript or jQuery?

I have a webpage where there is a full height intro image. Underneath this image is the main body of the site with a regular site header at the top, I'm trying to create an effect where once the user scrolls down to the site header, they cannot scroll back up to view the intro image.
CSS Classes:
Main Intro Image: .cq-fullscreen-intro
Site Header: .nav-down
I had a poke around on StackOverflow but I can't find anything that addresses this circumstance, can anyone point me in the right direction to achieve this using jQuery?
you can use JQuery scrollTop function like this
$(function() {
$(window).scroll(function() {
var scroll = $(window).scrollTop();
// set the height in pixels
if (scroll >= 200) {
// after the scroll is greater than height then you can remove it or hide it
$(".intro-image").hide();
}
});
});
So instead of scrolling, I personally think it would be better to have it be actionable. Forcing the user to manually do the transition (and all in between states) is a bad idea. If the user scrolls half way, and see's something actionable (menu, button, input field) is it usable? If it is, what happens if they submit... very awkward. If it isn't usable, how do they know when it is? How do they know it's because they haven't scrolled all the way. It's very poor user experience.
In the following example, I've created a pseudo-screenport for you to see what's actually going on. The .body container in your real site would be the body element.
Code Pen Example
$(document).ready(function(){
$('.splash-screen').on('click', function(){
$('.splash-screen').addClass("is-hidden");
});
})
html, body{
background: #eee;
margin: 0;
padding: 0;
}
.flex-root {
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
width: 100vw;
}
.web-container {
width: 640px;
height: 480px;
background: #fff;
}
.body {
font-size: 0; // this is only to prevent spacing between img placholders
position: relative;
}
.splash-screen{
position: absolute;
transition: transform 1s ease-in-out;
}
.splash-screen .fa {
position: absolute;
z-index: 1;
font-size: 24px;
color: #fff;
left: 50%;
bottom: 15px;
}
.splash-screen.is-hidden {
transform: translateY(-110%);
transition: transform 1s ease-in-out;
}
<link href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="flex-root">
<div class="web-container">
<div class="body">
<div class="splash-screen">
<img src="https://via.placeholder.com/640x480?text=Splash+Screen"/>
<i class="fa fa-chevron-circle-up"></i>
</div>
<img src="https://via.placeholder.com/640x60/cbcbcb?text=Menu"/>
<img src="https://via.placeholder.com/640x420/dddddd?text=Site Body"/>
<div>
</div>
</div>
While its not direclty preventing you from scrolling up and its not jQuery, I would suggest to remove/hide the element once its out of view.
You could get the current scroll position, relative to the top of the page, and check if its greater than the elements height:
const target = document.getElementById('my-target')
const targetHeight = target.getBoundingClientRect().height
const scrollEventListener = () => {
if (
document.body.scrollTop > targetHeight ||
document.documentElement.scrollTop > targetHeight
) {
target.remove()
window.removeEventListener('scroll', scrollEventListener)
document.documentElement.scrollTop = 0
}
}
window.addEventListener('scroll', scrollEventListener)
Here is a codepen https://codepen.io/bluebrown/full/aboagov

Custom scroll UX

I'm currently working on a project where the desired user experience involves a very customized interaction with scroll events.
Problem to solve:
The page has X sections, each of them with a height equal to the viewport hight height: 100vh;. When a user scrolls down on the viewport, the current visible section stays where it is and a scroll indicator animates based on a threshold of distance scrolled (30px, for example). Once the user has scrolled the threshold, the next section comes up from the bottom of the screen and covers up the current section (which still doesn't move).
Initial Approach:
Set each section to an absolute position and adjust them with by changing CSS classes based on the scrollwheel event. Body overflow:hidden and transform property to manipulate the sections. I am running in to issues, though.
The scrollwheel event seems to be documented as very unstable solution to implement.
The .wheelDelta aspect of the event fires asynchronously and is difficult to capture a gesture with. (On chrome, it just spits out a multiple of 3 a bunch of times rather than a distance of the gesture in px). This makes it difficult to set a threshold and animate the elements that are responsive to that threshold.
I basically want to be able to track the number of pixels a scrollwheel-like event is covering and apply that number to the position of a certain scroll-hint element until the scroll threshold is met. Once it is met, a function fires to change the classes and update some information on the page. If the threshold is not met, the scroll hint element goes back to it's default position.
My attached approach doesn't feel very conducive to accomplishing this, so I'm looking for either 1) a different and more stable approach or 2) revisions / criticisms on what I'm doing wrong with this approach to make it stable.
(function scrollerTest($){
$('body').on ('mousewheel', function (e) {
var delta = e.originalEvent.wheelDelta,
currentScreenID = $('section.active').data('self').section_id,
currentScreen = $('section.part-' + currentScreenID),
nextScreenID = currentScreenID + 1,
nextScreen = $('section.part-' + nextScreenID);;
if (delta < 0) { // User is Scrolling Down
currentScreen.removeClass('active').addClass('top');
nextScreen.removeClass('bottom').addClass('active')
} else if (delta > 0) { // User is Scrolling Up
}
});
}(jQuery));
body {
overflow: hidden;
padding: 0;
margin: 0;
}
section {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100vh;
z-index: 999;
background-color: #CA5D44;
transition: 0.8s all ease-in-out;
}
section.part-1 {
position: relative;
z-index: 9;
}
section.part-2 {
background-color: #222629;
}
section.active {
transform: translateY(0);
}
section.top {
transform: translateY(-10%);
}
section.bottom {
transform: translateY(100%);
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<body>
<section class="part-1 home active" data-self='{ "section_id" : 1, "section_title" : "Home", "menu_main_clr" : "#fff" , "menu_second_clr" : "#CA5D44", "logo_clr" : "white" }'>
</section>
<section class="part-2 about bottom" data-self='{ "section_id" : 1, "section_title" : "About", "menu_main_clr" : "#CA5D44" , "menu_second_clr" : "#fff", "logo_clr" : "white" }'>
</section>
<section class="part-3 contact bottom" data-self='{ "section_id" : 1, "section_title" : "Contact", "menu_main_clr" : "#fff" , "menu_second_clr" : "#CA5D44", "logo_clr" : "white" }'>
</section>
</body>
Edit Note:
The snippet seems to have some issue with firing the event and changing classes after the first instance - not sure why. On my local example it fires them all at once..
**Edite Note 2: **
Listed code is just a copy of the closest behaviour I could achieve. The whole threshold functionality seems pretty unattainable with this method, unfortunately, as the wheel event doesn't behave like a scroll event.
the whole scroll topic is rather complex especially when you think about touch scroll events, too.
There are some libraries out there - see this list for example: http://ninodezign.com/30-jquery-plugins-for-scrolling-effects-with-css-animation/
I used https://projects.lukehaas.me/scrollify/ before and it might allow you to do what you intend (using the before callback eventually) but I can't tell without trying myself. Also regard that scrollify is relatively big (8kb minified) in comparison to other libraries.
You can approach this using by ensuring each content-filled section is followed by a blank transparent gap (in the example below, also 100vh in height) and then using javascript to apply position:fixed to each content-filled section when it hits the top of the viewport.
Example:
var screens = document.getElementsByClassName('screen');
function checkPosition() {
for (var i = 0; i < (screens.length - 1); i++) {
var topPosition = screens[i].getBoundingClientRect().top;
if (topPosition < 1) {
screens[i].style.top = '0';
screens[i].style.position = 'fixed';
}
}
}
window.addEventListener('scroll',checkPosition,false);
.screen {
position: absolute;
display: block;
left: 0;
width: 100%;
height: 100vh;
}
.red {
position: fixed;
top: 0;
background-color: rgb(255,0,0);
}
.orange {
top: 200vh;
background-color: rgb(255,140,0);
}
.yellow {
top: 400vh;
background-color: rgb(255,255,0);
}
.green {
top: 600vh;
background-color: rgb(0,191,0);
}
.blue {
top: 800vh;
background-color: rgb(0,0,127);
}
p {
font-size: 20vh;
line-height: 20vh;
text-align: center;
color: rgba(255,255,255,0.4);
}
<div class="red screen">
<p>Screen One</p>
</div>
<div class="orange screen">
<p>Screen Two</p>
</div>
<div class="yellow screen">
<p>Screen Three</p>
</div>
<div class="green screen">
<p>Screen Four</p>
</div>
<div class="blue screen">
<p>Screen Five</p>
</div>

keep the background image fixed position and centered

In my project, I need to show a small image in center of the visible part of the container, with respect to the window i.e .loader. Even when the user scrolls the page, the image should be visible in center of .loader.
I successfully implemented this but now I am facing a edgecase which is when user scrolls the page "up to the header" or "down to the footer", the small image is hiding. demo.
This is actually normal behaviour but in these edgecases, I want the image to stick to top/bottom end of the .loader container.
What I want:
Keep the small image always at center of .loader container. (I already implemented this)
when scrolled to any end of .loader container, the image should stick to that end instead of hiding behind the container.
Fiddle
A solution using just css is preferred. I am looking for browser support in IE9+, chrome and firefox.
.header {
height: 600px;
width: 650px;
background-color: grey;
}
.left-side {
height: 300px;
width: 150px;
float: left;
background-color: red;
}
.loader {
background-image: url('http://i.imgur.com/U2njI.jpg');
margin-left: 150px;
height: 1500px;
width: 500px;
background-position: 345px center;
background-repeat: no-repeat;
background-attachment: fixed;
background-color: cornflowerblue;
}
.footer {
height: 600px;
width: 650px;
background-color: silver;
}
<div class="header"></div>
<div class="left-side"></div>
<div class="loader"></div>
<div class="footer"></div>
Here is a working solution with javascript, I hope its behaviour is how you expect it to be. I'm unfortunately not able to test it on IE9 right now but it should work (DEMO):
document.addEventListener('DOMContentLoaded',function() {
var loader = document.querySelector('.loader'),
loaderRect = loader.getBoundingClientRect(),
loaderTop = loaderRect.top + document.body.scrollTop,
loaderBottom = loaderTop + loader.offsetHeight,
initialBgPos = loader.style.backgroundPosition,
imageHeight = 141;
function onScroll() {
var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
if(loaderTop >= (scrollTop + (window.innerHeight - imageHeight)/2)) {
loader.style.backgroundPosition='345px ' + (loaderTop - scrollTop) + 'px';
} else if(loaderBottom <= (scrollTop + (window.innerHeight + imageHeight)/2)) {
loader.style.backgroundPosition='345px ' + (loaderBottom - scrollTop - imageHeight) + 'px';
} else {
loader.style.backgroundPosition = initialBgPos;
}
}
window.addEventListener('scroll', onScroll);
onScroll();
});
To achieve what I think you want. We have to set the position of the .loader div to fixed, then it'll always stay where it's placed, regardless of whether the user scrolls the page, the div will scroll too. In here's how to set the position of loader to fixed in CSS (you may also have to get the position of your fixed div):
.loader{
position: fixed;
left: 100px;
top: 300px;
}
Here's your upadted JSFiddle: http://jsfiddle.net/Ezhb4/4/

Float a div at the bottom right corner, but not inside footer

I'm trying to implement a "go to top" button that floats at the bottom right corner of a page. I can do this with the following code, but I don't want this button to enter the footer of my page. How can I stop it from entering the footer and stay at the top of it when user scrolls the page down to the bottom of the page?
CSS
#to-top {
position: fixed;
bottom: 10px;
right: 10px;
width: 100px;
padding: 5px;
border: 1px solid #ccc;
background: #f7f7f7;
color: #333;
text-align: center;
cursor: pointer;
display: none;
}
JavaScript
$(window).scroll(function() {
if($(this).scrollTop() != 0) {
$('#to-top').fadeIn();
} else {
$('#to-top').fadeOut();
}
});
$('#to-top').click(function() {
$('body,html').animate({scrollTop:0},"fast");
});
HTML
<div id="to-top">Back to Top</div>
EDIT
Here is a drawing of how it should look like. The black vertical rectangle is a scroll bar. The "back to top" button should never enter the footer region.
Here is a jsfiddle.
The solution turned out to be more complicated than I thought. Here is my solution.
It uses this function to check if footer is visible on the screen. If it is, it positions the button with position: absolute within a div. Otherwise, it uses position: fixed.
function isVisible(elment) {
var vpH = $(window).height(), // Viewport Height
st = $(window).scrollTop(), // Scroll Top
y = $(elment).offset().top;
return y <= (vpH + st);
}
$(window).scroll(function() {
if($(this).scrollTop() == 0) {
$('#to-top').fadeOut();
} else if (isVisible($('footer'))) {
$('#to-top').css('position','absolute');
} else {
$('#to-top').css('position','fixed');
$('#to-top').fadeIn();
}
});
jsfiddle
Increase the value of bottom: 10px; than the height of footer.
I saw your screenshot now,just add some padding-bottom to it.
Solution
$(document).ready(function(){
$(window).scroll(function(){
btnBottom = $(".btt").offset().top + $(".btt").outerHeight();
ftrTop = $(".footer").offset().top;
if (btnBottom > ftrTop)
$(".btt").css("bottom", btnBottom - ftrTop + $(".btt").outerHeight());
});
});
Fiddle: http://jsfiddle.net/praveenscience/BhvMg/
You forgot to give the z-index, that prevents it from being on top!
z-index: 999;
Or if it is overlapping with the footer of your page, you can increase the co-ordinates.
bottom: 50px;
Your question is still not clear, "stop it from entering the footer". Does it overlap?

Positioning absolute div inside relative parent - webkit browsers

My HTML basically looks like this:
<div id="#container">
<div id="left_col">
left stuff
</div>
<div id="middle_col">
middle stuff
</div>
<div id="right_col">
<div id="anchor"></div>
<div id="floater>
The problem div
</div>
</div>
</div>
The container div is pushed 82px to the left, because I don't want the rightmost column to be used as part of the centering (there is a header navigation bar above that is the size of left_col and middle_col):
#container {
width: 1124px;
margin-left: auto;
margin-right: auto;
text-align: left;
color: #656f79;
position: relative;
left: 82px;
}
#left_col {
float:left;
width: 410px;
background-color: #fff;
padding-bottom: 10px;
}
#middle_col {
width: 545px;
float: left;
}
#right_col {
float: left;
width: 154px;
margin-left: 5px;
position:relative;
}
#floater {
width: 154px;
}
I'm using the following javascript to keep the #floater div in position as you scroll down the page:
var a = function() {
var b = $(window).scrollTop();
var d = $("#anchor").offset().top;
var c = $("#floater");
if (b > d) {
c.css({position:"fixed",top:"10px"});
} else {
c.css({position:"absolute",top:""});
}
};
$(window).scroll(a);
a();
The problem I'm having is that in WebKit based browsers, once jQuery makes the floater div's positioning fixed so it will stay 10px from the top, that "left: 82px" from #container goes out the window, causing #floater to jump 82px to the left. This doesn't happen in FF or IE. Does anybody know a solution to this?
Update: Solved
I've solved this problem by not using fixed positioning, but instead using absolute positioning. I changed the javascript to set the top CSS property of div#floater to be based on the value $(window).scrollTop() if div#anchor's top offset is greater than $(window).scrollTop(). Pretty simple.
So the a() function now looks like this:
var a = function() {
var b = $(window).scrollTop();
var d = $("#anchor").offset().top;
var c = $("#floater");
if (b > d) {
var t = b-200; //200px is the height of the header, I subtract to make it float near the top
c.css({top:t+"px"});
} else {
c.css({top:""});
}
};

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