Develop Reference

Javascript Accordian

I have a simple accordion working, except for one thing. I would like to be able to re-click the same accordion item again, and be able to set height to '0'.
Currently, the open accordion item closes when I click a different accordion item, which is exactly what I want to do — but I also want the ability to re-click the open accordion item and have that one close, when clicked. See working example below:
https://codepen.io/celli/pen/BaNLJWb
// set heights to 0
gsap.set('.content', {
height: 0
});
// click function
$('.accordianItem').click(function() {
if ($('.accordianItem').hasClass('on')) {
gsap.to($('.content'), {
duration: .25,
height: 0
});
$('.accordianItem').removeClass('on');
}
gsap.to($(this).children('.content'), {
duration: .25,
height: "auto"
});
$(this).addClass('on');
});
What code can I add to add this extra functionality?

I have modified your code by adding another if that checks if the element clicked has 'on' class already. It should now work as you intended it to (hide when the user clicks on the already opened header).
// set heights to 0
gsap.set('.content', {height:0});
// click function
$('.accordianItem').click(function() {
if($(this).hasClass("on")){
gsap.to($('.content'), {duration:.25, height:0});
$('.accordianItem').removeClass('on');
}
else{
if ($('.accordianItem').hasClass('on')) {
gsap.to($('.content'), {duration:.25, height:0});
$('.accordianItem').removeClass('on');
}
gsap.to($(this).children('.content'), {duration:.25, height:"auto"});
$(this).addClass('on');
}
});

You can do this much more simply than how you're currently doing it:
// Create the animation that you need
const tl = gsap.timeline({paused: true});
tl.to('.content', {duration: 0.25, height:0});
// Set the timeline to its end state
tl.progress(1);
// Toggle the timeline's direction
$('.accordianItem').click(function() {
tl.reversed() ? tl.play() : tl.reverse();
});
Demo
I highly recommend checking out the GreenSock forums. They're super useful and you can get quick help from people who are experts in GSAP and web animation :)

How can I remove a class *after* a GSAP timeline animation finishes?

I've created a simple GSAP timeline animation to slide a fullscreen div over the entire viewport.
Because the page that it's going to be sliding in over has scrollable content on it, I've set the visibility to hidden, and pushed it off of the page. When I click the selected nav link, the class of "active" is added and the animation fires.
For some reason, when I reverse it, it removes the class immediately, even if I add something like this:
$(closeAbout).on('click', "#close", function () {
timeline.reversed() ? timeline.play() : timeline.reverse();
$("#teambio").removeClass('active');
});
I've included all of the timeline code below, in case that's helpful to anyone:
var closeAbout = $('#close');
var openAbout = $('#about');
var main = $('main');
var timeline = new TimelineMax({
paused: true,
reversed: true
});
timeline
.to( "main", 0.3, {
opacity: 0,
}, 0)
.to(".about", 1, {
y: "0%",
ease: Power4.easeInOut
})
.to(".blurb", 1, {
y: "0%",
opacity: 1,
ease: Power4.easeInOut,
delay: 0.5
}, 0)
.to("#close", 0.5, {
opacity: 1,
ease: Power4.easeInOut,
delay: 0.8,
}, 0);
$(openAbout).on('click', "#about", function () {
$("#teambio").addClass('active');
timeline.reversed() ? timeline.play() : timeline.reverse();
});
$(closeAbout).on('click', "#close", function () {
timeline.reversed() ? timeline.play() : timeline.reverse();
$("#teambio").removeClass('active');
});
All I want is for the class to be removed AFTER the timeline finishes, and for some reason nothing that I've tried is working.
Also, I know that I could probably structure and name all of this better than it appears here, but I'm both new to GSAP and also just trying to get this to work.
Any help and patience would be greatly appreciated.

With something like this:
timeline.reversed() ? timeline.play() : timeline.reverse();
$("#teambio").removeClass('active');
The .play() or .reverse() function will run and start animating. Once that function returns, the next line will run, removing the class. You wouldn't want the next line to wait for the animation to complete because then all of your JavaScript would be waiting for the animation to complete!
What you should do instead is make use of GSAP's onComplete callback:
var timeline = new TimelineMax({
paused: true,
reversed: true,
onComplete: function() {
$("#teambio").removeClass('active');
}
});
GSAP will fire that function every time the tween completes.
By the way, we recommend that you upgrade to GSAP 3 doing so is easy! The new formatting is quite nice once you're used to it.

Swipe element down and up to delete/remove element using hammer.js and jQuery?

I'm trying to swipe an element up/down to delete it.
I am using hammer.js and jQuery.
So far I can delete the element using swipe left/right which works fine.
But I need to achieve the exact same thing using swipe up/down.
I have created this working example here:
https://codepen.io/anon/pen/YJPPyB
click on the button and an element will appear and then Swipe left/right to delete it.
With the code above, I tried the followings but it doesn't work as expected:
$toast.animate({ top: event.deltaX, opacity: opacityPercent }, { duration: 50, queue: false, specialEasing: 'easeOutQuad' });
and
$toast
.removeClass('panning')
.animate({ bottom: 0, opacity: 1 }, {
duration: 300,
specialEasing: 'easeOutExpo',
queue: false
});
Can someone please advice on this issue?
Thanks in advance.
EDIT:
When I change this:
hammerHandler.on('pan', function (event) {
To this:
hammerHandler.on('pandow', function (event) {
I can move the element when I pandown but I dont know why it is very wonky!
This is how I swipe down now but it somtimes freezes the whole page and I dont undertand why!
hammerHandler.on('pandown', function (event) {
// Change toast state
$toast.addClass('panning');
var opacityPercent = 1 - Math.abs(event.deltaX / activationDistance);
if (opacityPercent < 0)
opacityPercent = 0;
$toast.animate({ marginBottom: event.deltaX, opacity: opacityPercent }, { duration: 50, queue: false, specialEasing: 'easeOutQuad' });
});

JQuery collapsing/expanding need to calculate height

I think I'm nearly there, I just need to calculate the height of the hidden children height and apply it to the div.
I probably need to write a function that dynamically changes based of the height of the children.
On the demo, click on the Expand/collapse image.
CLICK EXPAND
var currentHeight = $('.Tile.is-expanded .Tile-flyout').outerHeight();
TweenMax.fromTo(".Tile.is-expanded .Tile-flyout", 0.8, { height:0, autoAlpha:0, ease: Linear.easeNone }, { height:currentHeight, autoAlpha:1,});
TweenMax.fromTo(".Tile.is-expanded .Tile-flyout > *", 0.8, {height:0, ease: Linear.easeNone }, {height:"auto"});
CLICK COLLAPSE
var currentHeightOpen = $('.Tile .Tile-flyout').outerHeight();
TweenMax.fromTo(".Tile .Tile-flyout", 0.8, { height:currentHeightOpen, autoAlpha:1, ease: Linear.easeNone }, {height:0, autoAlpha:0,});
TweenMax.fromTo(".Tile .Tile-flyout > *", 0.8, { height:"auto", ease: Linear.easeNone }, {height:0,});
DEMO here, you need to fork it

Here is a Code pen with how to do what I explain in my comments on your main post:
https://codepen.io/anon/pen/mqLREK?editors=0010
function(code){ //Ignore this, I apparently need code to link codepen
//code code
}
You will notice, that in the expand, I grab a list of all the child elements you will be expanding and making visible, I then loop through, and for every 3 I add the cell block height to the running height of the items (because we have 3 per line).
Note, if there can be more or less than 3 per line, you may have to do something to determine this and adjust the loop increment accordingly

Cross-dissolve transition for scrolled elements

I am creating a long single page website and using ScrollMagicJS v1.3.0 to trigger events and to make some elements sticky. I would like to create a variety of other transition effects as one scrolls down the page.
Here's a jsfiddle that replicates the horizontal scrolling of my site.
scrollControl = new ScrollMagic({
vertical: false,
});
var myScrollScene = new ScrollScene({
triggerHook: 0,
offset: 0,
triggerElement: '#shot-0-1',
duration: '100vw',
pushFollowers: true
})
.setPin('#shot-0-1')
.addTo(scrollControl);
For instance, I want to create fade-to-black, flare-to-white, and cross-dissolve transitions between pages.
I understand some of the basic principles of HTML5 transitions, how to make one image dissolve into another, but I haven't been able to figure out a clever way to do it using the ScrollMagic scrolling.
Things I've considered: The next page slides under the current page and then transitions from 1.0 to 0 opacity using ScrollMagic triggers?
But how to do it in a way non-hacky and consistent with ScrollMagic's framework?

This has been asked and answered in the ScrollMagic's issues section:
https://github.com/janpaepke/ScrollMagic/issues/269
here's a copy:
A common misconception is that you need to do everything with the ScrollMagic pin functionality.
If the content isn't moving within the scroll flow anyway (it stays in position and is faded out or moved to side or sth. like that) you can have it as "fixed" right from the beginning.
That saves a lot of work and confusion.
The only reason to use ScrollMagic's pinning functionality is when an element should sometimes scroll naturally with the DOM and sometimes it shouldn't.
So if you have elements that are in place and should just be replaced by others, have them fixed the whole time.
Like this: https://jsfiddle.net/janpaepke/6kyd6ss0/1/
If it is indeed a case were you should use ScrollMagic's pinning method, then do the animation inside of a wrapper, that you pin.
Like this: https://jsfiddle.net/janpaepke/6kyd6ss0/3/
　

Here's the solution I settled on.
scrollControl = new ScrollMagic({
vertical: false,
});
vw = $(window).width();
console.log("width:" + vw + "px");
// pin frame 2
var myScrollScene = new ScrollScene({
triggerHook: 0,
triggerElement: '#shot-2',
// This pin is considerably longer than average
offset: 0,
// duration = stickyLength + disolve_duration
duration: 1.5 * vw + 'px'
})
.setPin('#content-2', {
pushFollowers: false
})
.addTo(scrollControl)
.addIndicators({
zindex: 100,
suffix: 'pin2'
});
// move frame 3 up early and pin it
var myScrollScene = new ScrollScene({
triggerHook: 0,
triggerElement: '#shot-2',
offset: 0,
// duartion = 1.5, but why?
duration: 1.5 * vw + 'px'
// the faux pin doesn't actually expand the container the way SM does
// so the results are a little strange
})
.on("start end", function (e) {
$('#content-3').css({left: 0, position:'fixed'});
})
.on("enter leave", function (e) {
$('#content-3').css({left: 0, position:'relative'});
})
.addTo(scrollControl)
.addIndicators({
zindex: 100,
suffix: 'pin3faux'
});
var dissolve = TweenMax.to('#content-2', 1, {
autoAlpha: 0
});
// dissolve frame 2 to frame 3
var myScrollScene = new ScrollScene({
triggerHook: 0,
// Note that though we are fading frame 2, we are
// using the arrival of frame 3 the trigger
triggerElement: '#shot-2',
// The sets the rapidity of the dissolve
// offset = stickyLength
offset: 0.33 * vw + 'px',
// The sets the rapidity of the dissolve
duration: 1 * vw + 'px'
})
.setTween(dissolve)
.addTo(scrollControl)
.addIndicators({
zindex: 100,
suffix: 'dissolve'
});
I used a pushFollowers: false on a pin and z-index to slide the next frame (also pinned) behind the first. Then a Tween to dissolve into the second frame. The result is a nice cinematic dissolve feature with adjustable duration.
Hope it is useful to others.
https://jsfiddle.net/wmodes/b4gdxeLn/