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Why do my elements flicker before an animation using css

I was creating a 2048 clone from scratch as a project. I have got the game pretty much working only problem is that my animations look janky. I have used css grid to construct my game board and after every move (user input) all the tiles are meant to slide across the board in a direction. That part works fine, it's when they start the slide animation that for whatever reason some of the elements flicker.
I'm not the best with css animations but I have tried to look at every resource I could and I couldn't find any solutions suited to my code. I tried switching the animation timing, delaying the animation etc to no avail. I did use a package animate-css-grid (because animating css grid is hard) which only handles the tiles sliding across the grid and I do not suspect that it is causing the issue.
I have put the code on js fiddle if anyone is interested to try and see the problem https://jsfiddle.net/codedjourney/uv1o48L6/3/ hello
Also if anyone has a better way of animating css grid let me know the package while helpful is a bit odd to work with. Thanks for the help

I managed to get rid of the flickering by commenting out the hidden class in the addTile method
addTile(tile) {
// create the tile
const tileElm = document.createElement("div")
tileElm.classList.add(
"cell",
"tile",
// "hidden",
`cell-${tile.x}-${tile.y}`
)
const valueElm = document.createElement("div")
valueElm.classList.add("tile-container", `value-${tile.value}`)
valueElm.textContent = tile.value
tileElm.appendChild(valueElm)
this.display.appendChild(tileElm)
this.cells[tile.x][tile.y] = new Tile(
tileElm,
tile.x,
tile.y,
tile.value
)
// request frame to allow transition to play
window.requestAnimationFrame(() => {
tileElm.classList.remove("hidden")
})
}

As I saw your code All I see is that it's getting larger while colliding and it's happening because you have added css the one which scales your box while colliding.
Transform: Scale
Try using this css style and you might get your problem solved.

Flexslider breaks jQuery accordion [duplicate]

I have a test page to better explain my problem. I have several items on a list (they're images on the test page); when I click on one of them, a corresponding slideshow, using flexslider, sldes down.
The problem is that, on page load, the slideshow shows all slides at once, at a much smaller size than intended. But then, if I switch the focus from the window (i.e. switch between browser tabs or move to another program and come back), the slideshow is now working and the slides are the proper size. This happens in mobile devices too.
When I check with firebug, there's an element.style rule applying to ul.slides:
transform: translate3d(-89px, 0px, 0px);
Which hides one of the slides. Additionally, there's another rule for the list items inside ul.slides that gives them their initial width, which is not even the same for all sliders so I don't understand where it is coming from.
Can someone take a look and suggest a fix? I've tried overriding the element.style rule but so far unsuccessfully.

I think I've figured it out, in principal at least...
.flexslider{display:none;} seems throw off the re-size function of Flexslider.
You could just remove it, but that makes for some ugly loading.
To avoid said ugly loading I put together a quick, work-around- jsFiddle
$(document).ready(function(){
$(".flexslider").css('display','block').slideUp();
});
There's a still a quick glitch while loading, but hopefully it will at least steer you in the right direction.
Another method I played with a bit was to try and force the re-size function like so-
$(".client").click(function () {
$('.flexslider').resize(); // Problematic but promising
var project = this.id;
var project_id = '#' + project + '-project';
var elem = $(".flexslider:visible").length ? $(".flexslider:visible"): $(".flexslider:first");
elem.slideUp('slow', function () {
$(project_id).slideDown('slow');
});
});
This sort of solved the mini-picture issue, but was spotty at best.

Activate gif when cursor is over

I am building a Star Wars fansite.
My navigation menu will be star wars lightsabers.
I am planning to make (when the cursor is over the lightsaber) for the actual light sword to come out. When the cursor leaves the lightsaber, it goes back down.
I have a gif that does that, but how to make it unactive then active when cursor is hovered over??
If the idea above doesn't sound correct, how would you suggest I do it?

No, you can't control the animation of the images.
You would need two versions of each images, one that is animated (.gif), and one that's not(.gif/.png/.jpg/etc).
On hover you can easily change from one image to another.
Example:
$(function(){
$('img').each(function(e){
var src = $(e).attr('src');
$(e).hover(function(){
$(this).attr('src', src.replace('nonanimated.gif', 'animated.gif'));
}, function(){
$(this).attr('src', src);
});
});
});
Reference link

like Parag Meshram said, but no need to do it with jQuery or JavaScript:
.foo {
background: url(still.png) no-repeat 0 0;
}
.foo:hover {
background-image: url(animation.gif);
}

It might be a overkill, but I think you can control the GIF with WebGL.
Here is some GIF manipulation, it's not what you ask for, but maybe some inspiration for doing something own http://www.clicktorelease.com/code/gif/

Your best bet is to actually split the handle and the sword into two different graphics to then animate the sword in with Javascript (as background property). This way you wouldn't have the restrictions of the GIF file format but still a lot smaller files. You'll need to create a div the same size as the sword and set it as background, then set the background-position-x to -100% and animate it back in on hover, you can use jQuery for that:
$('.sword').on('hover', function(event){
$(this).animate({
'background-position-x': '0%',
}, 100, 'linear');
});
$('.sword').off('hover', function(event){
$(this).animate({
'background-position-x': '-100%',
}, 100, 'linear');
});
(I wrote this off the top of my head, check the jQuery docs if this doesn't work)

I had a similar situation and found a pretty simple solution. I'm pretty new to JQuery, so I'm not sure if this is in line with best practices, but it works.
I've used a static image (.png for transparency, in my case) and switched out the src attribute to point to the animated .gif on mouseenter and back to the .png on mouseleave. For your lightsaber to go from hilt alone to powering up I would do it a bit differently than usual. Try taking a frame from the .gif in Photoshop and making it into a static image using "save for web and devices". I recommend .png. In your HTML markup use this static image of the hilt for your src of the image, also be sure to give it an ID, such as saber for this example.
Now onto the jquery script. I link it in a separate file. For one saber it should look something like this:
$(document).ready(function()
{
$("#saber").mouseenter(
function()
{
$(this).attr("src", "img/stillframehilt.png");
},
function()
{
$(this).attr("src", "img/saberpowerup.gif");
});
$("#saber").mouseleave(
function()
{
$(this).attr("src", "img/saberpowerup.gif");
},
function()
{
$(this).attr("src", "img/stillframehilt.png");
});
});
Notice the on mouseleave I had it switch src to "img/saberpowerdown.gif". I think that rather than have the saber revert back instantaneously to the hilt in its dormant state (which any Star Wars geek[myself included] would wince at) it would look better to have a .gif that is essentially the reverse of the saber turning on. This can be achieved by reversing the order of the animation frames(ensure that visible layers are correct). For good measure I would make sure when to have it not loop either .gif's as well as add a few extra frames of the hilt alone when the power down is finished to ensure it remains off.
Also, it might be beneficial to add a .click to the saber to change the src to the power down, or even a different animation, but that is just extra flair. For each additional lightsaber use the same code, just changing the id to reference each in a logical way such as by color.
Again, I can't claim this to be in line with best practices as far as jquery goes (I'm but a padawan) but this method worked when I needed to activate a .gif on mouseenter and back on .mouseleave . May The Force be with you.

How can I achieve this background scroll effect?

I really like the way each background section overlaps each other which scrolling down. I have seen it done a lot:
here is the link : http://www.soleilnoir.net/believein/
Any ideas how to achieve the similar effect?
Thanks

This effect is called parallax.
Here are some links related to this effect:
a great demo from Nike http://www.nike.com/jumpman23/aj2012/
a collection of parallax http://webdesignledger.com/inspiration/21-examples-of-parallax-scrolling-in-web-design (make sure to see each example, some are really great ! ex: http://benthebodyguard.com/index.php http://www.siebennull.com/ http://janploch.de/)
Mercedez Class A web site http://a-class.mercedes-benz.com/com/en/index.html#!/?s=live (not really parallax but still great)
a tutorial on how to make an image slider using parallax effect http://tympanus.net/codrops/2011/01/03/parallax-slider/
another tutorial with different effects http://tympanus.net/codrops/2012/03/15/parallax-content-slider-with-css3-and-jquery/
a library to do parallax https://github.com/cameronmcefee/plax
another library https://github.com/markdalgleish/stellar.js
You may also like this:
http://johnpolacek.github.com/scrollorama/
http://joelb.me/scrollpath/

You could achieve that through a combination of watching the scroll offset position and then animating different elements based on that scroll position. You would set an event listener and at certain positions fire functions to animate an element onto the page.
If using jQuery, something like this:
$(document).on("scroll", checkScrollPosition);
function checkScrollPosition() {
var scrollPos = $(window).scrollTop();
switch (scrollPos) {
case (500):
doSomething();
break;
case (1000):
doSomethingElse();
break;
}
}
function() doSomething {
// use animate to animate element(s) at 500
}
function() doSomethingElse {
// use animate to animate element(s) at 1000
}
I'm sure that could be optimized better than that, but that should be enough to get started.

jQueryui animation with inital undefined height

See the following fiddle:
[edit: updated fiddle => http://jsfiddle.net/NYZf8/5/ ]
http://jsfiddle.net/NYZf8/1/ (view in different screen sizes, so that ideally the image fits inside the %-width layouted div)
The image should start the animation from the position where it correctly appears after the animation is done.
I don't understand why the first call to setMargin() sets a negative margin even though the logged height for container div and img are the very same ones, that after the jqueryui show() call set the image where I would want it (from the start on). My guess is that somehow the image height is 0/undefined after all, even though it logs fine :?
js:
console.log('img: ' + $('img').height());
console.log('div: ' + $('div').height());
$('img').show('blind', 1500, setMargin);
function setMargin() {
var marginTop =
( $('img').closest('div').height() - $('img').height() ) / 2;
console.log('marginTop: ' + marginTop);
$('img').css('marginTop', marginTop + 'px');
}
setMargin();

Interesting problem...after playing around with your code for a while (latest update), I saw that the blind animation was not actually firing in my browser (I'm testing on Chrome, and maybe it was firing but I wasn't seeing it as the image was never hidden in the first place), so I tried moving it inside the binded load function:
$('img').bind('load', function() {
...
$(this).show('blind', 500);
});
Now that it was animating, it seemed to 'snap' or 'jump' after the animation was complete, and also seemed to appear with an incorrect margin. This smacks of jQuery not being able to correctly calculate the dimensions of something that hadn't been displayed on the screen yet. On top of that, blind seems to need more explicit dimensions to operate correctly. So therein lies the problem: how to calculate elements' rendered dimensions before they've actually appeared on the screen?
One way to do this is to fade in the element whose dimensions you're trying to calculate very slightly - not enough to see yet - do some calculations, then hide it again and prep it for the appearance animation. You can achieve this with jQuery using the fadeTo function:
$('img').bind('load', function() {
$(this).fadeTo(0, 0.01, function() {
// do calculations...
}
}
You would need to work out dimensions, apply them with the css() function, blind the image in and then reset the image styles back to their original states, all thanks to a blind animation that needs these dimensions explicitly. I would also recommend using classes in the css to help you manage things a little better. Here's a detailed working example: jsfiddle working example
Not the most elegant way of doing things, but it's a start. There are a lot more easier ways to achieve seemingly better results, and I guess I just want to know why you're looking to do image blinds and explicit alignment this way? It's just a lot more challenging achieving it with the code you used...anyways, hope this helps! :)