Develop Reference

Keep div visible in the middle of the window while scrolling down and fade out after reaching a certain point

I am trying to do a simple parallax effect with jQuery and CSS.
I have 2 long divs, one is 2000px and the other is 1000px each one of those divs have a child div with text inside.
I would like to have these child divs to be centered in the middle of the visible window (not the div which is 2000px high, just the visible window) and to stay centered and in the middle while I scroll down, then fade out at a certain point before reaching the next div.
At the moment, I managed to create the html layout and the css, and made the divs to fade out on click using jQuery.
But I am unable to center them in the middle of the window and keep them fixed while I scroll down and fade them out before reaching the next div.
Maybe I can use Waypoint.js to trigger events at certain points in the scroll but how do I keep the div centered and visible to achieve the parallax effect?
DEMO https://jsfiddle.net/fmub10pv/4/
EDIT Are there any plugins (with demo) that can achieve what I want?
EDIT 2 The desired effect is something like this http://davegamache.com/parallax/
HTML
<div class="container" id="firstContainer">
<div class="row">
<div class="col-md-12 text-center">
<div id="firstDiv" class="animate text-center">
<h1>First Div</h1>
</div>
</div>
</div>
</div>
<div class="container" id="secondContainer">
<div class="row">
<div class="col-md-12 text-center">
<div id="secondDiv" class="animate text-center">
<h1>Second Div</h1>
</div>
</div>
</div>
</div>
CSS
body {
background-color: #16191b;
color: white;
}
#firstContainer {
height: 2000px;
margin-top: 80px;
background: darkslategrey;
}
#secondContainer {
height: 1000px;
background: darkslateblue;
}
.animate {
padding: 20px;
background: mediumseagreen;
}
#firstDiv {
opacity: 1;
-webkit-transition: all 0.5s ease-in-out;
-moz-transition: all 0.5s ease-in-out;
-ms-transition: all 0.5s ease-in-out;
-o-transition: all 0.5s ease-in-out;
transition: all 0.5s ease-in-out;
}
#secondDiv {
opacity: 1;
-webkit-transition: all 0.5s ease-in-out;
-moz-transition: all 0.5s ease-in-out;
-ms-transition: all 0.5s ease-in-out;
-o-transition: all 0.5s ease-in-out;
transition: all 0.5s ease-in-out;
}
Javascript
$(document).ready(function() {
var current = $(window).scrollTop();
var winHeight = $(window).height();
var total = winHeight - current;
$('#firstDiv').on('click', function() {
if ($('#firstDiv').css('opacity') == 0) $('#firstDiv').css('opacity', 1);
else $('#firstDiv').css('opacity', 0);
});
$('#secondDiv').on('click', function() {
if ($('#secondDiv').css('opacity') == 0) $('#secondDiv').css('opacity', 1);
else $('#secondDiv').css('opacity', 0);
});
});

The following will check if you've passed a certain waypoint and update the opacity for how much further you scroll thereafter.
Do you mind jQuery?
$(window).scroll(function() {
waypoint = 400
if ($(document).scrollTop() > waypoint) {
alpha = 1 - (($(document).scrollTop() - waypoint) / 260) // 260 is an arbitrary number, the size determines how quickly it will fade out (reach 0)
} else {
alpha = 1
}
$("#fade").css({
"opacity": alpha
});
});
https://jsfiddle.net/mqk9xux6/

This can be achieved by creating a class that makes use of the fixed position, which then gets applied to the target element based on scroll offset. Note that the fixed position is not a block-level element, so you will need to give it a width of 95% as well to match the original design:
CSS:
.fixed {
position: fixed;
width: 95%;
}
jQuery:
$(window).scroll(function() {
if ($(document).scrollTop() > 2000) {
$('#firstDiv').removeClass('fixed');
} else if ($(document).scrollTop() <= 2000) {
$('#firstDiv').addClass('fixed');
}
});
In the above example, I've used an offset of 2000px. This means that the first DIV will stay fixed until it overlaps exactly with the second DIV. Scrolling up the page, the first DIV will stay fixed again. Hopefully this is the sort of effect you're looking for.
I've created a fiddle showcasing this here.
Hope this helps! :)

Add fade-in class to the first div initially
<div id="firstDiv" class="animate text-center fade-in">
To center the divs
#firstDiv,
#secondDiv {
position: fixed;
top: 20%;
left: 0;
right: 0;
margin : 0 auto;
height : 500px;
width : 500px;
transition: opacity 0.5s ease;
opacity:0;
}
To fade them out on scroll
$(window).scroll(function (){
var scrollPos = $(this).scrollTop();
if(scrollPos >= 2000)
$("#firstDiv").removeClass("fade-in");
if(scrollPos >= 2200)
$("#secondDiv").addClass("fade-in");
}).scroll();

CSS transition of a div does not animate

When I click a div, I want a second div to expand/collapse. That is done using JS, HTML, and CSS. Now I want the CSS transition to animate.
Right now all I get is a jumping expansion and either a scroll (Edge) or a jump after a wait (Chrome, Opera, Firefox).
I've tried to set height to 1px instead of 0px, but that doesn't change anything.
function growDiv(id) {
var ele = document.getElementById(id);
if (ele.style.height == '100%') {
ele.style.height = '0px';
} else {
ele.style.height = '100%';
}
}
.main {
font-weight: 700;
overflow: hidden;
cursor: pointer;
}
.secondary {
-webkit-transition: height .5s ease;
-moz-transition: height .5s ease;
-ms-transition: height .5s ease;
-o-transition: height .5s ease;
transition: height .5s ease;
overflow: hidden;
padding-left: 20px;
height: 0px;
cursor: pointer;
}
<div class="main" onclick="growDiv('expandable')">
Expand
</div>
<div class="secondary" id="expandable" onclick="growDiv('expandable')">
number1,
<br>number2,
<br>number3,
<br>number4.
</div>
Codepen behaves as I know the full site does, so for good measure; here's the codepen: http://codepen.io/anon/pen/ezJQjM

From http://css3.bradshawenterprises.com/animating_height/
Instead of using 100%, just "let it" get the auto value by not restraining it.
NOTE: 100px is just "any number bigger than the actual size"
function growDiv(id) {
var ele = document.getElementById(id);
if (ele.style.maxHeight != '0vh') {
ele.style.maxHeight = '0vh';
} else {
ele.style.maxHeight = "100vh";
}
}
.main {
font-weight: 700;
overflow: hidden;
cursor: pointer;
}
.secondary {
-webkit-transition: all .5s ease;
-moz-transition: all .5s ease;
-ms-transition: all .5s ease;
-o-transition: all .5s ease;
transition: all .5s ease;
overflow: hidden;
padding-left: 20px;
cursor: pointer;
}
<div class="main" onclick="growDiv('expandable')">
Expand
</div>
<div class="secondary" id="expandable" onclick="growDiv('expandable')" style="max-height: 0vh;">
number1,
<br>number2,
<br>number3,
<br>number4.
</div>
EDIT: Changed everything to VH (viewport height) so it will never grow bigger than 100% of the screen height and will adapt to the max height of any screen.
Also switched the "style="max-height: 0vh;" to the element itself instead of the class, so you could be unsetting it with ele.style if needed (otherwise you will need to set a new value to override the class.

Are you willing to use jQuery? It offers some cool animation possibilities, and may accomplish what you are trying to do. This is just a possible alternative to your approach.
Check out my fiddle here:
https://jsfiddle.net/3mo28z1t/11/
<div class="main" id="clicker">
Expand
</div>
<div class="secondary" id="expandable">
number1, <br> number2, <br> number3, <br> number4.
</div>
<script>
$( document ).ready(function() {
$(".secondary").hide();
$(document).ready(
function(){
$("#clicker").click(function () {
$(".secondary").toggle("slow");
});
});
});
</script>

The problem is caused by switching units of measure, so from pixels to percent. I would probable do it a little differently though.
growDiv = function(id) {
document.getElementById(id).classList.toggle('expanded');
}
.main {
font-weight: 700;
overflow: hidden;
cursor: pointer;
}
.secondary {
transition: max-height .5s ease;
overflow: hidden;
padding-left: 20px;
max-height: 0;
cursor: pointer;
}
.secondary.expanded {
height: 100%;
max-height: 100px;
}
<div class="main" onclick="growDiv('expandable')">
Expand
</div>
<div class="secondary" id="expandable" onclick="growDiv('expandable')">
number1,
<br>number2,
<br>number3,
<br>number4.
</div>
You'll notice the JS is a bit simpler, and it relies more on the CSS.

jQuery: Is it possible to use slideUp and append text at the same time?

When a user mouses over a picture, I want to slideUp a description, so that new text will appear. When the user mouses out, the description will slideDown.
This is what I've tried so far:
$pic1.hover(function () {
var text1 = $("<div>Price1:$100</div>").hide();
text1.appendTo($('.this')).slideUp("slow");
},function () {
$(this).slideDown();
}
);
Unfortunately, this doesn't work. I googled around, but couldn't find anything. Is it possible to use slideUp and slideDown to show and hide the text?

A better approach would be to use CSS transitions. They're lightweight and easy to do. You can read the specification on transitions here. Here is a quick guide on the matter.
fiddle
HTML
<div class="imageDiv">
<img src="http://placekitten.com/g/200/300" />
<div class="imageDescription">
What a lovely kitty kat!
</div>
</div>
CSS
.imageDiv {
display: block;
float: left;
overflow: hidden;
position: relative;
width: 200px;
}
.imageDescription {
-webkit-transition: top 0.5s ease;
-moz-transition: top 0.5s ease;
-ms-transition: top 0.5s ease;
-o-transition: top 0.5s ease;
transition: top 0.5s ease;
background: rgba(0, 0, 0, 0.4);
color: #f7f7f7;
left: 0;
position: absolute;
text-align: center;
text-decoration: none;
top: 100%;
width: 100%;
}
.imageDiv:hover .imageDescription {
display: block;
top: 93%;
}
There a few key things that make this work. First, a CSS transition is used. Transitions are written in the following form:
transition: [property] [duration] [timing-function] [delay];
As can be seen in the example above, I used a transition that targeted the top attribute. I gave it a 0.5s duration and an ease effect. However, this alone wouldn't produce the effect, as the description would just sit below the image and move up on hover. We don't want to see the description until the user hovers over the image!
To address this, you need to add overflow: hidden; to the parent div.imageDiv. This hides the image description, until the transition, when it will be slide up, causing it to no longer overflow.

http://jsfiddle.net/qvbgb/3/
HTML
<div class="imgcontainer">
<div class="image">
<img src="link.jpg" />
</div>
<div class="text">
<h3>Product name</h3>
<p>Description</p>
</div>
</div>
Jquery
$(document).ready(function(){
$('.text').hide();
$('.container').hover(
function () {
$(this).find('.image').slideUp();
$(this).find('.text').slideDown();
},function () {
$(this).find('.text').slideUp();
$(this).find('.image').slideDown();
}
);
})
CSS
.container{
min-width : 150px;
min-height : 150px;
width : 150px;
height : 150px;
cursor : pointer;
display : block;
}
.image img{
width : 150px;
height : 150px;
}

slideUp() will only hide an element, and slideDown() will only show an element. If you want to show an element with slideUp effect or hide with slideDown effect, you have to explicitly call it:
$(text1).show("slide", { direction: "up" }, 1000);
$(text1).hide("slide", { direction: "down" }, 1000);

Hide a div on hover outside of div

<div id='container'>
<div id="animate"></div>
</div>
I have a small div inside a big div with id container . i want to hide div with id animate if someone hovers the out side of small div . it should remain open when mouse is over the small div .

This should do it
$('#small').hover(function () {
$('#animate').show();
}, function () {
$('#animate').hide();
});

Try:
CSS:
#container{width:100px;height:100px;background:#F00;}
#animate{width:50px;height:50px;background:#0F0;}
Script:
$(function(){
$('#container').mouseenter(function(){
$('#animate').fadeTo(1000,0)
.mouseenter(function(){$(this).fadeTo(1000,1)});
}); // use 750 in place of 1000 to animate it fast
});
Docs http://api.jquery.com/mouseenter/
HTML:
<div id='container'>
<div id="animate"> </div>
</div>
Fiddle: http://jsfiddle.net/aZmfz/4/

HTML:
<div id='container'>
<div id="animate">HI!</div>
</div>
CSS:
#container{
width: 100px;
height: 200px;
background-color: black;
}
#animate{
height: 50px;
width: 100px;
background-color: white;
opacity: 0;
}
jQuery:
$("#animate").hover(
function(){
$(this).stop().animate({
opacity: 1
}, 1000);
},
function(){
$(this).stop().animate({
opacity: 0
}, 1000);
}
);
EXAMPLE
You may not want to do a strict show/hide, because the element will have no height/width to hover over when it's hidden. Instead, you may prefer to set the opacity to 0 (to hide) or 1 (to show) and let the animate function transition between the two. You'll also notice that I used the .stop() function. This is because if you hover back and forth over the element it will continue to call the queued up animations. Calling stop first will prevent this.

You can achieve the same effect with pure CSS:
#animate {
-webkit-transition: opacity 0.2s;
-moz-transition: opacity 0.2s;
transition: opacity 0.2s;
}
#container:hover #animate {
opacity: 0;
}
#container #animate:hover {
opacity: 1;
}
Demo: http://jsfiddle.net/gXz2A/

How to create sliding DIV on click?

I am looking to create a slide out DIV, like the one here when you press "Contact". Does anybody know of anything similar to this?

Making use jQuery's slideToggle() method could help you do this.
Example
HTML:
<div id="contact">
Contact me!
</div>
Contact
CSS:
#contact
{
display: none;
background: grey;
color: #FFF;
padding: 10px;
}
JavaScript:
$(function()
{
$("a#toggle").click(function()
{
$("#contact").slideToggle();
return false;
});
});

If you don't want to use jQuery and you can stick to modern browsers you can try:
Demo: http://jsfiddle.net/ThinkingStiff/EVyE8/
HTML:
<div id="slide">click me</div>
CSS:
#slide {
height: 50px;
transition: height 500ms ease;
-moz-transition: height 500ms ease;
-ms-transition: height 500ms ease;
-o-transition: height 500ms ease;
-webkit-transition: height 500ms ease;
}
Script:
document.getElementById( 'slide' ).addEventListener( 'click', function() {
this.style.height == '50px' || this.style.height == ''
? this.style.height = '150px'
: this.style.height = '50px';
}, false );

yet another sample, but without jquery, and with a class add/remove approach :)
Demo: http://jsfiddle.net/1wbh8pqj/
The main idea is that you have two classes, one of them applies to the slider, and the another, says how the slider should show when it is expanded.
.slider {
height: 0px;
overflow: hidden;
transition: height 0.5s ease;
-moz-transition: height 0.5s ease;
-ms-transition: height 0.5s ease;
-o-transition: height 0.5s ease;
-webkit-transition: height 0.5s ease;
}
.slided {
height: 100px;
}
so, you have to set the 'slided' class to the slider when it has to be expanded, and remove it when the slider has to be shrinked, and using the super-mega-uber-awesome css transition, the height will smoothly change :)
var expander = document.getElementById("expander");
expander.addEventListener("click", function () {
var slider = document.getElementsByClassName("slider")[0];
if (slider.classList.contains("slided")) {
slider.classList.remove("slided");
} else {
slider.classList.add("slided");
}
});
ohbtw, the html:
<div class="slider">i am teh slidah!! :D</div>
<div class="content">and i am the content XD</div>
<div id="expander">click me to expand/hide the slidah! :O</div>

Another sample
Sample
http://jsfiddle.net/9cdYR/
HTML
<div id="slide">
Slide content<br />
Slide content<br />
Slide content<br />
</div>
<div id="content">
Content<br />
Content<br />
Content<br />
</div>
<button id="slide_button">Slide it</button>
CSS
#content {
background-color: #c0c0c0;
border: 1px solid blue;
}
#slide {
border: 1px solid red;
background-color: #000;
color: #fff;
overflow: hidden;
}
JS
$('#slide_button').click(function() {
$('#slide').animate({
height: 'toggle'
}, 1500, function() {
});
});

With jQuery, you make the div and add display:none with css. Then, something like:
$('.button').click(function(e){
e.preventDefault();
$('#mydiv').slideToggle();
});

The almighty jQuery comes to a rescue, once again.
If you don't want to use jquery, just set a timer and increase the height.