Develop Reference

Show/hide div or image when scrolling

Is there a way to show an image or a div when scrolling down a web page and hide it when not scrolling and vice versa?
So in the code below the red div would be displayed when not scrolling, and the green div would be displayed only when scrolling.
.square {
position: fixed;
width: 100px;
height: 100px;
}
.green {
background: green;
display: none;
}
.red {
background: red;
}
.container {
width: 100%;
height: 3000px;
}
<div class="container">
<div class="square green"></div>
<div class="square red"></div>
</div>
The end goal is to achieve something like this: https://mailchimp.com/annual-report/ where the character appears to be walking when the user scrolls, and stands still when the user stops. Is this easily achievable?

You just need an eventListener that listen to a scroll event. However this has the issue that it only recoginze when you scroll but not when you stop scrolling. For that you can use this answer that explains how to listen for a "scroll-stop"
To make the code shorter and easier, I removed your display: none from the green box. I added a new class d-none that contains this proeprty now instead. By default it is added to the green box.
With classList.toggle('d-none') I can toggle class within both boxes which makes it easier then to address and then add or remove the class for every box on its own.
var timer = null;
var box = document.querySelectorAll('.square');
window.addEventListener('scroll', function() {
if (timer !== null) {
clearTimeout(timer);
} else {
box.forEach(el => el.classList.toggle('d-none'));
}
timer = setTimeout(function() {
box.forEach(el => el.classList.toggle('d-none'));
}, 150);
}, false);
.d-none {
display: none;
}
.square {
position: fixed;
width: 100px;
height: 100px;
}
.green {
background: green;
/* display: none; */
/* removed */
}
.red {
background: red;
}
.container {
width: 100%;
height: 3000px;
}
<div class="container">
<div class="square green d-none"></div>
<div class="square red"></div>
</div>

You just need a setTimeout function:
(function($) {
$(function() {
$(window).scroll(function() {
$('.square.red').show()
$('.square.green').hide()
clearTimeout($.data(this));
$.data(this, setTimeout(function() {
$('.square.red').hide()
$('.square.green').show()
}, 250));
});
});
})(jQuery);
.square {
position: fixed;
width: 100px;
height: 100px;
}
.green {
background: green;
}
.red {
background: red;
display: none;
}
.container {
width: 100%;
height: 3000px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="container">
<div class="square green"></div>
<div class="square red"></div>
</div>

Using jQuery / JavaScript to float element to right

Fiddle
Hello,
I found sticky sidebar jQuery script, but the fixed element (sidebar) floats to the left once I start scrolling down. I am trying to keep it on the right-hand side the whole time. Also, I am trying to get some spacing around sidebar once it starts scrolling, as now it's just stuck to the very top.
I trust it's a simple fix but JavaScript is like a dark forest to me, I tried to change couple things, tried to look online but can't seem to find the answers or I just don't know how to look for them so I apologise if this has been asked before.
$( document ).ready(function() {
console.log( "document ready!" );
var $sticky = $('.sticky');
var $stickyrStopper = $('.sticky-stopper');
if (!!$sticky.offset()) { // make sure ".sticky" element exists
var generalSidebarHeight = $sticky.innerHeight();
var stickyTop = $sticky.offset().top;
var stickOffset = 0;
var stickyStopperPosition = $stickyrStopper.offset().top;
var stopPoint = stickyStopperPosition - generalSidebarHeight - stickOffset;
var diff = stopPoint + stickOffset;
$(window).scroll(function(){ // scroll event
var windowTop = $(window).scrollTop(); // returns number
if (stopPoint < windowTop) {
$sticky.css({ position: 'absolute', top: diff });
} else if (stickyTop < windowTop+stickOffset) {
$sticky.css({ position: 'fixed', top: stickOffset });
} else {
$sticky.css({position: 'absolute', top: 'initial'});
}
});
}
});
.container {
width: 1000px;
float: left
}
.header {
clear: both;
margin-bottom: 10px;
border: 1px solid #000000;
height: 90px;
}
.sidebar {
float: right;
width: 350px;
border: 1px solid #000000;
}
.content {
float: right;
width: 640px;
border: 1px solid #000000;
height: 800px;
}
.footer {
clear: both;
margin-top: 10px;
border: 1px solid #000000;
height: 820px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<div class="container">
<div class="header">
This is header
</div>
<div class="sidebar sticky">
This is side bar
</div>
<div class="content">
This is main content
</div>
<div class="footer">
<div class="sticky-stopper"></div>
This is my footer
</div>
</div>

I used the Sticky-Kit.js plugin. That worked for me. See below, it keeps your sidebar to the right the entire time and has the sticky effect you're after:
$(document).ready(function() {
console.log("document ready!");
$(".sidebar").stick_in_parent();
});
.container {
width: 1000px;
float: left
}
.header {
clear: both;
margin-bottom: 10px;
border: 1px solid #000000;
height: 90px;
}
.sidebar {
float: right;
width: 350px;
border: 1px solid #000000;
}
.content {
float: left;
width: 640px;
border: 1px solid #000000;
height: 800px;
}
.footer {
clear: both;
margin-top: 10px;
border: 1px solid #000000;
height: 820px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdn.rawgit.com/leafo/sticky-kit/v1.1.2/jquery.sticky-kit.js"></script>
<div class="container">
<div class="header">
This is header
</div>
<div class="sidebar sticky">
This is side bar
</div>
<div class="content">
This is main content
</div>
<div class="footer">
<div class="sticky-stopper"></div>
This is my footer
</div>
</div>

You can use JQuery's css() method to apply css on scroll to the element to achieve the desired effect.
Change the JavaScript as follows:
if (stopPoint < windowTop) {
$sticky.css({ position: 'absolute', top: diff, right: '0px' });
} else if (stickyTop < windowTop+stickOffset) {
$sticky.css({ position: 'fixed', top: stickOffset, right: '0px' , margin: '10px 10px 0px 0px'});
} else {
$sticky.css({position: 'absolute', top: 'initial', right: "0px", margin: '0px'});
}
A css property of right:0px is applied to the element on scroll, since it's position becomes aboslute on scroll.
margin: 10px 10px 0px 0px was also applied to the element to provide additional spacing around it when scrolling. This is then sent to margin:0px when the scroll stops.
You will also need to adjust the css of the content css class, if you do not want your side bar sitting on top of the content area.
.content {
width: 550px;
border: 1px solid #000000;
height: 800px;
}
Here is an updated fiddle demonstrating these changes.

Make a div scroll with page only in a certain place?

How can it be made so that a div scrolls with the page but only in a certain area of the page?
I can't work out how to do this with CSS for only part of the page, I think javascript may be the only option.
For e.g. There's three sections of a page, Top, Middle and Bottom.
There's a right floated div which should scroll with the user in the middle section and stop scrolling to be 'left in place' at the top of the middle section as well as the bottom of the middle section.
#Top {
background-color: grey;
width: 100%;
height: 400px;
}
#Middle {
background-color: green;
width: 100%;
height: 800px;
}
#Bottom {
background-color: blue;
width: 100%;
height: 400px;
}
#scrolling-section {
background-color: yellow;
width: 30%;
height: 150px;
float: right;
}
<div id="Top">
</div>
<div id="Middle">
<div id="scrolling-section">
This box should scroll along the green section but 'cut-off' and stop scrolling at the top and bottom of the green section
</div>
</div>
<div id="Bottom">
</div>
JSFiddle: fiddle

So here you have solution using jquery:
Listen to the scroll event and calculate how much the scrolling-section goes outside the Middle section while scrolling up / down.
Added position: relative to the scrolling-section.
Adjust the position of the scrolling-section accordingly.
$(document).scroll(function() {
var wrapper = $('#Middle');
var box = $('#scrolling-section');
var offsetTop = - wrapper.offset().top + $(window).scrollTop();
var offsetBottom = wrapper.offset().top - $(window).scrollTop() + wrapper.outerHeight() - box.outerHeight();
if (offsetBottom > 0 && offsetTop < 0) {
box.css({
'top': 0
});
} else if (offsetBottom > 0 && offsetTop > 0) {
box.css({
'top': offsetTop + 'px'
});
} else {
box.offset({
'top': $(window).scrollTop() + offsetBottom
});
}
});
#Top {
background-color: grey;
width: 100%;
height: 400px;
}
#Middle {
background-color: green;
width: 100%;
height: 800px;
}
#Bottom {
background-color: blue;
width: 100%;
height: 400px;
}
#scrolling-section {
position: relative;
background-color: yellow;
width: 30%;
height: 150px;
float: right;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="Top">
</div>
<div id="Middle">
<div id="scrolling-section">
This box should scroll along the green section but 'cut-off' and stop scrolling at the top and bottom of the green section
</div>
</div>
<div id="Bottom">
</div>
Let me know your feedback on this. Thanks!

Some Javascript is needed in order to read the point where you want to change the state of the div you wish to address. You can do this with the getBoundingClientRect() method. I have worked out a fiddle that will show you.
What happens is that you read the position of #Middle. I have added an input field that shows you the value. The change will be when the position hits zero. You then change the CSS properties of the #scrolling-section.
You will see some added readings of the element to ensure that it can be positioned in place and will keep its original width;
var scrollposition = document.getElementById("Middle");
var scrollsection = document.getElementById("scrolling-section");
var scrollsection_offsetLeft = scrollsection.offsetLeft;
var scrollsection_width = scrollsection.offsetWidth;
var valy = document.getElementById("posy");
window.addEventListener("scroll", function(event) {
valy.value = scrollposition.getBoundingClientRect().y || scrollposition.getBoundingClientRect().top;
if (valy.value <= 0) {
scrollsection.style.position = "fixed";
scrollsection.style.top = "0px";
scrollsection.style.left = scrollsection_offsetLeft + "px";
scrollsection.style.width = scrollsection_width + "px";
} else {
scrollsection.style.position = "static";
scrollsection.style.top = "auto";
scrollsection.style.left = "auto";
}
}, false)
#posy {
position: fixed;
top: 0;
}
#Top {
background-color: grey;
width: 100%;
height: 400px;
}
#Middle {
background-color: green;
width: 100%;
height: 800px;
}
#Bottom {
background-color: blue;
width: 100%;
height: 400px;
}
#scrolling-section {
background-color: yellow;
width: 30%;
height: 150px;
float: right;
}
<input type="text" id="posy" />
<div id="Top">
</div>
<div id="Middle">
<div id="scrolling-section">
This box should scroll along the green section but 'cut-off' and stop scrolling at the top and bottom of the green section
</div>
</div>
<div id="Bottom">
</div>

I'm on my mobile but if you add
#scrolling-section {
position: fixed;
background-color: yellow;
width: 30%;
height: 150px;
right: 8px;
}
This will scroll with the page but really there will need to be an event listener that will trigger when #scrolling-section appears on the screen possibly adding the attribute position:fixed; then another event listener when the #bottom appears calculates the size of #middle set margin-top & position:absolute; hope this helps point in the right direction.

Hide container div below menu bar div using jquery and css

I have a fixed header and menu bar and there is a container div when i scroll down the container div does not hide itself below the menu bar as shown in image below is the jquery code i am using. Please help to solve my issue.
var header= $('.header');
var start_div = $(header).offset().top;
var menu_div = $('.menu');
var menu = $(menu_div ).offset().top;
$.event.add(window, "scroll", function() {
var p = $(window).scrollTop();
$(header).css('position',((p)>start_div ) ? 'fixed' : 'static');
$(header).css('top',((p)>start_div ) ? '0px' : '');
$(header).css('width','840px');
$(header).css('min-height','108px');
});
$.event.add(window, "scroll", function() {
var p = $(window).scrollTop()+100;
$(menu_div).css('position',((p)>menu) ? 'fixed' : 'static');
$(menu_div).css('top',((p)>menu) ? '110px' : '');
$(menu_div).css('width','575px');
$(menu_div).css('height','57px');
});

Unless I'm missing something you don't need jQuery or even JS to do that.
Check the snippet (codePen here)
html,
body {
width: 100%;
height: 100%;
background-color: white;
}
.header-wrapper {
top: 0;
right: 0;
left: 0;
position: fixed;
height: 160px;
background-color: white;
}
.header {
background-color: cyan;
height: 100px;
width: 100%;
}
.menu {
width: 100%;
height: 50px;
background-color: green;
margin-top: 10px;
}
.content {
color: #fff;
background-color: black;
margin-top: 170px; /* same as height of header + nav + margins + 10px for coolness*/
}
<body>
<div class="header-wrapper">
<div class="header">Blue Header</div>
<div class="menu">Green Menu</div>
</div>
<div class="content">
My content<br>
<br><br><br><br><br><br><br><br><br><br><br><br><br><br>
blabla
<br><br><br><br><br><br><br><br><br><br><br><br><br><br>
blabla
<br><br><br><br><br><br><br><br><br><br><br><br><br><br>
</div>
</body>

Use the css z-index property.
.header, .menu {
z-index: 2
}
.container {
z-index: 1
}
http://www.w3schools.com/cssref/pr_pos_z-index.asp

Change the way of sliding div's and their event caller

HTML part:
<div id="container">
<div id="box1" class="box">Div #1</div>
<div id="box2" class="box">Div #2</div>
<div id="box3" class="box">Div #3</div>
<div id="box4" class="box">Div #4</div>
<div id="box5" class="box">Div #5</div>
<div id="box6" class="box">Div #6</div>
<div> <button class="Animate">left Animation</button></div>
<div> <button class="Animate2">right Animation</button></div>
</div>
​
Javascript part:
$('.box').click(function() {
$(this).animate({
left: '-50%'
}, 500, function() {
$(this).css('left', '150%');
$(this).appendTo('#container');
});
$(this).next().animate({
left: '50%'
}, 500);
});​
CSS part:
body {
padding: 0px;
}
#container {
position: absolute;
margin: 0px;
padding: 0px;
width: 100%;
height: 100%;
overflow: hidden;
}
.box {
position: absolute;
width: 50%;
height: 300px;
line-height: 300px;
font-size: 50px;
text-align: center;
border: 2px solid black;
left: 150%;
top: 100px;
margin-left: -25%;
}
#box1 {
background-color: green;
left: 50%;
}
#box2 {
background-color: yellow;
}
#box3 {
background-color: red;
}
#box4 {
background-color: orange;
}
#box5 {
background-color: blue;
}
#box6 {
background-color: grey;
}​
When the above code is complied and "div's in the pages are clicked" they move towards their left. I want the divs to move to their left when left animation button is clicked in sequence 1-2-3-4-5-1 and move to their right when right animation button is clicked in sequence 1-5-4-3-2-1. I have already posted a similar question on this forum but I accepted the answers by mistake even though they were not exactly what I was looking for. My mistake I was not clear enough in my question. I am sorry if am asking for a big code here. All the help is appreciated. This is the link to http://jsfiddle.net/ykbgT/4151/
This is the desired functionality: http://basic-slider.com/ not so good looking though!!

Take a look at this http://jsfiddle.net/tppiotrowski/VLzN4/1/
I used your existing CSS and HTML and only modified the Javascript. I think your question implied that you did not want the original functionality of clicking on the div, but instead wanted to use the two buttons. Please comment if you want me to re-add in the clicking on the div functionality of advancing the slides.
$(function() {
function createSlider(el_left, el_right, items) {
var index = 0;
el_left.click(function() {
var $this = items.eq(index);
$this.animate({
left: '-50%'
}, 500);
index = (index + 1) % items.length;
var $next = items.eq(index);
$next.css('left', '150%');
$next.animate({
left: '50%'
}, 500);
});
el_right.click(function() {
var $this = items.eq(index);
$this.animate({
left: '150%'
}, 500);
index = (index - 1) % items.length;
var $next = items.eq(index);
$next.css('left', '-50%');
$next.animate({
left: '50%'
}, 500);
});
}
createSlider($('.Animate'), $('.Animate2'), $('.box'));​
});
This function takes three jquery objects as arguments. The first is the button you wish to advance to the left. The second is the button you wish to advance to the right. The third is the items you wish to slide.