Develop Reference

How to avoid content jump by add fixed?

I created a sticky header on scroll. The only problem is that when I scroll down for 1000px, the class sticky is added to the header and after that, there is a little jump of the content at the same moment when the class sticky is added to the header. I think this becomes, because header doesn't exists anymore on that place in the markup visually.
I tried to add a specific height to the header. Also wrap a div around container, so the sub-header stays on that place, but with no success.
How should I fix this?
Live code: http://codepen.io/anon/pen/qbaQvL?editors=110

When the sticky activates you also need to set the margin-top of the about element equal to the height of the sticky.
It would be something like this:
if (windowPos >= content) {
$('#sub-header').addClass('sticky');
$('#about').addClass('sticky-active');
} else {
$('#sub-header').removeClass();
$('#about').removeClass();
}
#about.sticky-active {
margin-top: 96px;
}
I made a working version codepen too. You can see it here.

Just add padding to body, when creating sticky header:
JS:
if (windowPos >= content) {
$('#sub-header').addClass('sticky');
$('body').addClass('sticked');
} else {
$('#sub-header').removeClass();
$('body').removeClass('sticked');
}
CSS:
body.sticked {
padding-top: 96px;
}

You could just give the header an absolute positioning during the scrolling:
...
#sub-header {
position: absolute;
width: 100%;
}
#sub-header, #sub-header.sticky {
background: #FFF;
border-bottom: 1px solid #f0f0f0;
z-index: 2000;
}
...
... and add a padding to your sections:
section {
padding-top: 96px;
}
http://codepen.io/anon/pen/PZGxMZ

Show a hidden div when the user scrolls down the page

I have a navbar that sticks to the top of the page when you scroll past it.
When this navbar is fixed to the top of the page, I would like a logo to appear.
The logo is inside the div #navlogo.
I currently have #navlogo set to display: none. I am thinking that when you scroll past 100px its display will need be set to display block or something similar.
I have tried a few things but i'm not very good at java and had no luck.
You can check out the JSFIDDLE here
This is the script I'm using to set my navbar to fixed
$(window).scroll(function() {
var nav = $('#custom-bootstrap-menu');
var body = $('body');
var top = 100;
if ($(window).scrollTop() >= top) {
nav.addClass('navbar-fixed-top');
body.addClass('padding-fifty');
} else {
nav.removeClass('navbar-fixed-top');
body.removeClass('padding-fifty');
}
});
and a little css
#logo {
height: 100px;
}
.padding-fifty {
padding-top: 50px;
}
#navlogo {
display: none;
}
As you can see it sets the nav to fixed, and compensates the page offset by adding 50px. I need something here that will set #navlogo to visible. Can anyone offer some assistance?
Thanks so much for your help!

You can set the css display property in your Javascript:
var logo = $('div#navlogo');
logo.css('display', 'block');
For example: https://jsfiddle.net/gx25ospo/3/

Try adding this style to your CSS at last:
.navbar-fixed-top #navlogo {
display:block;
}

Try this https://jsfiddle.net/gx25ospo/4/
.navbar-brand {
display: none;
}
.visible {
display: block;
}
JS
if ($(window).scrollTop() >= top) {
nav.addClass('navbar-fixed-top');
body.addClass('padding-fifty');
$('.navbar-brand').addClass('visible');
} else {
nav.removeClass('navbar-fixed-top');
body.removeClass('padding-fifty');
$('.navbar-brand').removeClass('visible');
}

Hide portion of element offscreen and push & reveal on click

I'm building a responsive page that, when viewed on mobile, includes some popular behaviors.
I have an element that includes text and a link. The text portion needs to cover 100% of the width of the viewport and when clicked/tapped the link should push the text content left and reveal the link.
Fiddle: http://jsfiddle.net/Flignats/0n0fwm20/
HTML:
<div id="container">
<div id="block-one">
I'm a bunch of informational text.
</div>
<div id="block-two">
I'm a link!
</div>
</div>
CSS:
#container {
width: 100%;
height: 100px;
}
#block-one {
float: left;
width: 75%;
height: 100px;
background-color: #626366;
}
#block-two {
float: left;
width: 25%;
height: 100px;
background-color: #969696;
}
#block-two a {
color: blue;
}
How can I have block-one span the full width of the screen, block-two hidden off the screen, and, on click, animate (the margin?) block-two into view with block-one pushed to the left?
My apologies if I missed a clear example on site, most other questions were more complex.
I'd prefer not to build a jquery mobile page, though the push and reveal panels would accomplish this action. I'm also using Angular if nganimate is preferred over javascript.

Here is pure css solution: http://jsfiddle.net/3wcfggmf/
I've used trick with label and checkbox:checked to recognize if element is clicked or not.
input:checked + #block-one {
width: 75%;
}
If I didn't understand you correctly please let me know and I'll modify this PURE css solution for you :)

I forked your fiddle here with a working example: http://jsfiddle.net/90gm224q/
Added CSS to yours:
#container * { transition: width .4s; }
#container.clicked #block-one { width:25%; }
#container.clicked #block-two { width:75%; }
The JS:
var container = document.getElementById('container'),
link = document.getElementById('block-two').getElementsByTagName('a')[0];
link.onclick = function() {
container.className = 'clicked';
return false;
}
Assuming I understood your question correctly, you can play with the CSS values for width to achieve your desired effect.

You could accomplish this via CSS transistions and a JavaScript class toggle.
Demo - http://jsfiddle.net/Leh5t9t6/
In my demo, clicking #block-one toggles a class which fires the CSS transision. I included a pure JavaScript and jQuery version in the demo (you mentioned you'd prefer not use jQuery).
I also edited the styles slightly to accommodate the off-screen link.
Pure Javascript
var element = document.getElementById('block-one');
element.addEventListener('click', function () {
this.classList.toggle('reveal');
}, false);
jQuery
$('#block-one').on('click', function(){
$(this).toggleClass('reveal');
});

How to make a partially hidden div?

I want to make a half shown div in a page, like a footer. When I click it I want it to slide up. The div will contain information on it.
I achieved this somehow, but my problem is that the div does not get really hidden it just changes the position.
You can find the demo here: http://jsfiddle.net/8ZFMJ/394/
var clicked=false;
$(".two").on('click', function(){
if(clicked)
{
clicked=false;
$(".two").css({"bottom": -430});
}
else
{
clicked=true;
$(".two").css({"bottom": "-200px"});
}
});

I had a similar problem a while ago, in fact I think it was my first stackoverflow question. Unfortunately it got poorly received.
Anyway, the problem is currently that you are just changing the position of the div - that's what .bottom does. I think what you want to do is change the height, see this JSFiddle in which I managed to switch the div between states (no animation yet).
It makes simple use of css's overflow-y: hidden; to hide the div's contents when it is small, and all the JS does is toggle between heights:
if(clicked)
{
$(".two").css("height", 10);
}
else
{
$(".two").css("height", 250);
}
clicked = !clicked;
clicked = !clicked just flips the boolean state of the variable.
Now, to add the animation, we can use jQuery's .animate and produce this beautiful Fiddle
Basically, all we had to do in between is use animate instead of css. Simple, really.
TL;DR
final JSFiddle

.two must be absolute positioned inside .container that must be relative positioned. Then you just change the bottom with a negative value and that will hide the footer.
CSS:
html, body { height: 100%; }
.container {
position: relative;
height: 100%;
overflow: hidden;
}
.two {
position: absolute;
background-color: yellow;
width: 100%;
height:250px;
bottom: -200px;
transition: bottom 1s;
}
jQuery:
var clicked=false;
$(".two").on('click', function(){
if(clicked)
{
clicked=false;
$(".two").css({"bottom": "-200px"});
}
else
{
clicked=true;
$(".two").css({"bottom": 0});
}
});
http://jsfiddle.net/8ZFMJ/398/

Switch div from fixed to absolute at bottom of browser

Im trying to add a footer at the bottom of this content that doesn't overlay the content but moves it up.
The only way I can see it working would be something like, when browser is at the bottom remove 'fixed' class on the left red '#work'.
js fiddle DEMO
Updated js fiddle DEMO
HTML
<div id="header-block">
Header-block, this sits here in the background
</div>
<div id="content">
<div id="work">
This content should be fixed when at the top
</div>
<div id="description">
This content should scroll -
</div>
</div><!-- end content -->
<div id="footer">
This should appear at the bottom
</div>
CSS
body {
margin: 0px;
padding: 0px;
}
#header-block {
background: green;
width: 100%;
position: fixed;
z-index: 1;
height: 300px;
top: 0;
}
#content {
margin-top: 300px;
width: 100%;
position: relative;
z-index: 2;
}
#work {
background: red;
width: 50%;
height: 100vh;
float: left;
position: absolute;
}
#description {
background: blue;
width: 50%;
height: 1200px;
float: right;
font-size: 30px;
}
#footer {
background: black;
width: 100%;
height: 100px;
position: absolute;
z-index: 3;
bottom: 0;
}

If I understand your question correct, this should do the trick (although it depends very much on JavaScript unfortunately).
// Fix work column on scroll
contentStart = $("#content").offset().top ;
contentSize = $("#content").height() ;
window.onscroll = function(){
if( window.XMLHttpRequest ) {
var position=window.pageYOffset;
// calculate the position of the footer and the actual seen window
var docViewTop = $(window).scrollTop();
var docViewBottom = docViewTop + $(window).height();
var elemTop = $("#footer").offset().top;
if ( position > 300 && !(docViewBottom >= elemTop)) {
$('#work').css({'position':'fixed', 'top':'0', 'height':'100vh'});
} else {
// if the footer is visible on the screen
if(docViewBottom >= elemTop) {
$('#work').css({ 'top': 0 - (docViewBottom - elemTop) }); // scroll the #main div relative to the footer
} else {
$('#work').css({'position':'relative', 'top': 'auto'}) ;
}
}
}
}
For further informations about the calculations, perhaps this question on stackoverflow is useful.
Edit: Andrew Haining posted his answer in between of my answer, perhaps give his link a try and maybe it's a better (more proper) solution. Unfortunately I haven't actualised this page when I was testing your code in JSFiddle and I didn't see his answer.
If you want to use my script, make sure you can test it with different resolutions. It works just fine for my resolution in JSFiddle, I didn't test any other.

I'm not 100% sure what you want, but if you remove the position: absolute and the bottom: 0 from the footer, and put a div with class='clearboth' above the footer, it seems to do what you need.
CSS
.clearboth {
clear: both;
}
This is a drawing of what I see on your fiddle;
Do you want the red and the blue to always be touching the black?
I don't see the red overlying the black

You should use jQuery to add a class containing the position:fixed value when the scroll position of the page is less than the inline position of the #work div. Once it scrolls past the position, remove the class and have the element fall back in line.
You can achieve this using the following jQuery methods.. .scrollTop() .offset().top() and $(window).height().
This tutorial will give you an understanding of what you need to do to achieve the necessary results, you will just have to change the calculation slightly using $(window).height(), $('#footer').height() and a few other changes to get what you desire.

Based on the question you asked i think this is what you mean. The red div should be fixed when it gets to the top but be absolute when it is below the top for scrolling and the black footer should be below the red while scrolling, check this code i have done for you. just add this jquery script and run it.
<script type="text/javascript" src="js/jquery.js"></script>
<script>
$(document).ready(function() {
$(window).scroll(function () {
console.log($(window).scrollTop());
if ($(window).scrollTop() >= 322) {
$('#footer').css("z-index","1");
$('#work').css(
{
"background": "red",
"width": '50%',
'height': '100vh',
'float': 'left',
'position': 'fixed',
'top': '0'
});
}
if ($(window).scrollTop() <= 322)
{
$('#work').css(
{
"background": "red",
"width": "50%",
"height": "100vh",
"float": "left",
"position": "absolute"
});
};
});
});
</script>

If not exactly a parallax, this is somewhat close to how parallax works, containers moving at different speeds, and some containers sitting fixed or scrolling when they attain a particular top/bottom offset in the viewport.
There's plugin that can do it. Skrollr
You can use Skrollr along with skrollrcss, and it'll make sure how the containers take position on screen based on scrolltop of the window and the container specifically.