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clhenrick/Fullscreen-slides-with-TweenLite,-CSSPlugin-and-ScrollToPlugin.markdown

Forked from anonymous/Fullscreen-slides-with-TweenLite,-CSSPlugin-and-ScrollToPlugin.markdown
Last active August 29, 2015 14:16
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Raw
index.html
<nav>
<ul>
<li><a href="#slide-1">Slide 1</a></li>
<li><a href="#slide-2">Slide 2</a></li>
<li><a href="#slide-3">Slide 3</a></li>
<li><a href="#slide-4">Slide 4</a></li>
</ul>
</nav>
<div class="slides-container">
<div class="slide" id="slide-1">
<div class="centered">
<h1>Fullscreen slides with GSAP</h1>
<p>Let's go to the <span class="go-next">next slide</span>.</p>
</div>
</div>
<div class="slide" id="slide-2">
<div class="centered">
<h1>It is so easy to navigate through slides</h1>
<p>You can go back to <span class="go-prev">previous slide</span> or go to the <span class="go-next">next slide</span>.</p>
</div>
</div>
<div class="slide" id="slide-3">
<div class="centered">
<h1>Use mouse wheel</h1>
<p>No, really. Try to scroll up and down with the mouse wheel to switch between slides.</p>
</div>
</div>
<div class="slide" id="slide-4">
<div class="centered">
<h1>... Or use keyboard arrows</h1>
<p>You go to previous and next slide, using up and down keyboard arrows.</p>
</div>
</div>
</div>
Raw
script.js
//First the variables our app is going to use need to be declared
//References to DOM elements
var $window = $(window);
var $document = $(document);
//Only links that starts with #
var $navButtons = $("nav a").filter("[href^=#]");
var $navGoPrev = $(".go-prev");
var $navGoNext = $(".go-next");
var $slidesContainer = $(".slides-container");
var $slides = $(".slide");
var $currentSlide = $slides.first();
//Animating flag - is our app animating
var isAnimating = false;
//The height of the window
var pageHeight = $window.innerHeight();
//Key codes for up and down arrows on keyboard. We'll be using this to navigate change slides using the keyboard
var keyCodes = {
UP : 38,
DOWN: 40
}
//Going to the first slide
goToSlide($currentSlide);
/*
* Adding event listeners
* */
$window.on("resize", onResize).resize();
$window.on("mousewheel DOMMouseScroll", onMouseWheel);
$document.on("keydown", onKeyDown);
$navButtons.on("click", onNavButtonClick);
$navGoPrev.on("click", goToPrevSlide);
$navGoNext.on("click", goToNextSlide);
/*
* Internal functions
* */
/*
* When a button is clicked - first get the button href, and then slide to the container, if there's such a container
* */
function onNavButtonClick(event)
{
//The clicked button
var $button = $(this);
//The slide the button points to
var $slide = $($button.attr("href"));
//If the slide exists, we go to it
if($slide.length)
{
goToSlide($slide);
event.preventDefault();
}
}
/*
* Getting the pressed key. Only if it's up or down arrow, we go to prev or next slide and prevent default behaviour
* This way, if there's text input, the user is still able to fill it
* */
function onKeyDown(event)
{
var PRESSED_KEY = event.keyCode;
if(PRESSED_KEY == keyCodes.UP)
{
goToPrevSlide();
event.preventDefault();
}
else if(PRESSED_KEY == keyCodes.DOWN)
{
goToNextSlide();
event.preventDefault();
}
}
/*
* When user scrolls with the mouse, we have to change slides
* */
function onMouseWheel(event)
{
//Normalize event wheel delta
var delta = event.originalEvent.wheelDelta / 30 || -event.originalEvent.detail;
//If the user scrolled up, it goes to previous slide, otherwise - to next slide
if(delta < -1)
{
goToNextSlide();
}
else if(delta > 1)
{
goToPrevSlide();
}
event.preventDefault();
}
/*
* If there's a previous slide, slide to it
* */
function goToPrevSlide()
{
if($currentSlide.prev().length)
{
goToSlide($currentSlide.prev());
}
}
/*
* If there's a next slide, slide to it
* */
function goToNextSlide()
{
if($currentSlide.next().length)
{
goToSlide($currentSlide.next());
}
}
/*
* Actual transition between slides
* */
function goToSlide($slide)
{
//If the slides are not changing and there's such a slide
if(!isAnimating && $slide.length)
{
//setting animating flag to true
isAnimating = true;
$currentSlide = $slide;
//Sliding to current slide
TweenLite.to($slidesContainer, 1, {scrollTo: {y: pageHeight * $currentSlide.index() }, onComplete: onSlideChangeEnd, onCompleteScope: this});
//Animating menu items
TweenLite.to($navButtons.filter(".active"), 0.5, {className: "-=active"});
TweenLite.to($navButtons.filter("[href=#" + $currentSlide.attr("id") + "]"), 0.5, {className: "+=active"});
}
}
/*
* Once the sliding is finished, we need to restore "isAnimating" flag.
* You can also do other things in this function, such as changing page title
* */
function onSlideChangeEnd()
{
isAnimating = false;
}
/*
* When user resize it's browser we need to know the new height, so we can properly align the current slide
* */
function onResize(event)
{
//This will give us the new height of the window
var newPageHeight = $window.innerHeight();
/*
* If the new height is different from the old height ( the browser is resized vertically ), the slides are resized
* */
if(pageHeight !== newPageHeight)
{
pageHeight = newPageHeight;
//This can be done via CSS only, but fails into some old browsers, so I prefer to set height via JS
TweenLite.set([$slidesContainer, $slides], {height: pageHeight + "px"});
//The current slide should be always on the top
TweenLite.set($slidesContainer, {scrollTo: {y: pageHeight * $currentSlide.index() }});
}
}
Raw
style.css
body, div, p {
margin: 0;
padding: 0;
}
body {
font-family: "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif;
font-weight: 300;
letter-spacing: 0.0625em;
}
a {
text-decoration: none;
}
nav {
position: fixed;
top: 0;
left: 0;
width: 100%;
z-index: 100;
}
nav ul {
list-style: none;
text-align: center;
margin-top: 30px;
}
nav ul li {
display: inline-block;
margin-right: 20px;
}
nav ul li:last-child {
margin-right: 0;
}
#back-to-tutorial {
margin-left: 100px;
}
nav a {
position: relative;
top: 0;
padding: 10px 20px;
font-weight: normal;
font-size: 20px;
text-align: center;
border-radius: 4px;
background-color: #FFFFFF;
color: #83C78E;
-webkit-box-shadow: none;
-moz-box-shadow: none;
box-shadow: none;
}
nav a.active {
top: -4px;
background-color: #69C773;
color: #FFFFFF;
-webkit-box-shadow: 0 4px 0 0 #51a65f;
-moz-box-shadow: 0 4px 0 0 #51a65f;
box-shadow: 0 4px 0 0 #51a65f;
}
.slides-container {
position: absolute;
left: 0;
top: 0;
width: 100%;
height: 100%;
overflow: hidden;
z-index: 10;
}
.slide {
position: relative;
width: 100%;
height: 100%;
overflow: hidden;
}
.slide .centered {
width: 60%;
margin: 200px auto 0;
}
.slide .centered h1 {
text-align: center;
}
.slide .centered p {
text-align: center;
margin-top: 20px;
font-size: 20px;
}
#slide-1 {
background-color: #FFFFFF;
}
#slide-2 {
background-color: #45959b;
}
#slide-3 {
background-color: #778899;
}
#slide-4 {
color: #FFFFFF;
background-color: #291F37;
}
.go-prev, .go-next {
cursor: pointer;
font-weight: bold;
text-decoration: underline;
}
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