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How to replace margin-left animation with transform in Jquery animate() to fix laggy multislider

I'll preface this by saying my initial problem is difficult to reproduce.
Brief explanation of my problem following, question is at the bottom.
So I am using the Jquery multislider for a project.
Here is a link to it: Multislider
Now my issue is that the animation of the moving elements seems to lag... Sometimes.
It jumps instead of moving smoothly.
The way the element works is by applying the animate() method to the first item and applies an inline margin-left property to the first .item
With some research I have found that CSS animations often cause problems when margins are used for the animation(among some other properties like top/bottom/left/right, as well as height/width) and that using transform is preferable.
So far so good.
This is the snippet in the javascript that creates the animation:
function singleLeft(){
isItAnimating(function(){
reTargetSlides();
$imgFirst.animate(
{
marginLeft: -animateDistance /* This is the part that causes me problems */
}, {
duration: animateDuration,
easing: "swing",
complete: function(){
$imgFirst.detach().removeAttr('style').appendTo($msContent);
doneAnimating();
}
}
);
});
}
function singleRight(){
isItAnimating(function(){
reTargetSlides();
$imgLast.css('margin-left',-animateDistance).prependTo($msContent);
$imgLast.animate(
{
marginLeft: 0
}, {
duration: animateDuration,
easing: "swing",
complete: function(){
$imgLast.removeAttr("style");
doneAnimating();
}
}
);
});
}
Now if I understand it correctly, I have to replace the marginLeft: -animateDistance portion with a transformX property, is that correct?
But I am failing to make it work.
So my question is, how can I replace the marginLeft: -animateDistance portion with transform: translateX() and add the animateDistance variable between the parentheses?
I have tried something like transform: "translateX(-$(animateDistance))", but that just disables the animation entirely.
Am I missing something?
I'm open for other suggestions to solve the issue of the laggy animation as well, this just is the conclusion I came to.

You can use animate with $(this) and .css() if you use step()
let test = "100";
$('div h2').animate({ pxNumber: test }, {
step: function(pxNumber) {
$(this).css('transform','translateX(-' + pxNumber + 'px )');
},
duration:'slow',
easing: "swing",
complete: function(){
console.log('Animation done');
// doneAnimating();
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div><h2>Move it</h2></div>

How to set specific duration for properties

I've tried to research the docs for a feature I feel like is missing, or I'm simply missing something.
In this example, I'm animating the opacity and top properties with a duration of 1 second.
$elements
.velocity({opacity: 1, top: 0}, {duration: 1000})
Simple enough, but I want to tweak the animation a little. I'd like the opacity to have a duration of 2 seconds... But I can't seem to find an elegant way to achieve this.
I could always just repeat it like so:
$elements
.velocity({top: 0}, {duration: 1000})
$elements
.velocity({opacity: 1}, {duration: 2000})
... I'd like to avoid that spaghetti if possible.

That was almost too easy!
I was not connecting that http://julian.com/research/velocity/#queue was just the thing I was missing :)
Example:
$elements
.velocity({top: 0}, {duration: 1250})
.velocity({opacity: 1}, {duration: 3000, queue: false})
.velocity({opacity: 0}, {duration: 1000, delay: 2000})

jQuery animate left over time

I'm trying to make a div slide to the right by increasing the position left I want it to slowly go from the left hand side to the right and then loop back to the start. At the moment I'm just trying to animate the position so it doesn't jump instantly-
$('#pig').css('left', 200).animate(300);

The syntax is
$('#pig').animate({left: 200}, 300);
jQuery.animate documentation
To add animations in a queue you can either just chain them
$('#pig').animate({left: 200}, 300).animate({left: 0}, 300);
FIDDLE
or use the callback argument, or use jQuery's queue to set up as many animations as you'd like in a queue
$('#pig').queue(function() {
$(this).animate({left: 200}, 300);
$(this).animate({left: 0}, 300);
}).dequeue();
FIDDLE
or to make it recursive, you can use a combination of both
(function ani() {
$('#pig').queue(function() {
$(this).animate({left: 200}, 300);
$(this).animate({left: 0}, 300, ani);
}).dequeue();
}());
FIDDLE

Adeneo's answer is correct, but you also asked to loop back to the start. Assuming you want the div to go back to its original position, you need to chain another animation like this:
$('#pig').animate({left: 200}, 300, function() {
$('#pig').animate({left: 0}, 300);
});

setTimeout(function () {
$('#pig')
.css('left', 200)
.animate(300)
}, 1000)

Working with JQuery animate and "this" selector

I'm working on what I thought would be a simple chunk of code, trying to dynamically (using 'this') animate div blocks to scale (zoom) to the size of the parent container (section tag) on click.
My HTML:
<section>
<div id="project"></div><div id="project"></div><div id="project"></div>
<div id="project"></div><div id="project"></div><div id="project"></div>
</section>
My JavaScript:
$("#project").click(function() {
$(this).animate({
opacity: 0.75,
width: 100%,
height: 100%
}, 5000, function() {
});
});
Both Jquery and Jquery UI are linked correctly from Google Libraries (so says my console), my console also tells me that there is a syntax error with an unexpected ",", however I am taking this syntax straight from JqueryUI.com. Any help is appreciated!
Additionally, I want to be able to dynamically select all other divs except the currently clicked div and remove them from the DOM (using display:none), just so it looks cleaner, but I don't know how to go about 'selecting' them in my code...
Thanks all! :)

you are missing quotes around 100% so your code will be correct like this
$("#project").click(function() {
$(this).animate({
opacity: 0.75,
width: "100%",
height: "100%"
}, 5000, function() {
});
and please use unique IDs
Edit:
for using classes you can use something like that
$(".project").click(function() {
$(".project").css({'display':'none'});
$(this).css({'display':'block'});
$(this).animate({
opacity: 0.75,
width: "100%",
height: "100%"
}, 5000, function() {
});

I want to be able to dynamically select all other divs except the currently clicked div and remove them from the DOM (using display:none), just so it looks cleaner, but I don't know how to go about 'selecting' them in my code...
var $project = $(".project");
$project.click(function() {
var thisDiv = this;
$project.each(function(index, elem) {
if (elem!==thisDiv) $(elem).css('display', 'none');
});
$(thisDiv).animate({
opacity: 0.75,
width: "100%",
height: "100%"
}, 5000, function() {});
});

fadeOut() and slideUp() at the same time?

I have found jQuery: FadeOut then SlideUp and it's good, but it's not the one.
How can I fadeOut() and slideUp() at the same time? I tried two separate setTimeout() calls with the same delay but the slideUp() happened as soon as the page loaded.
Has anyone done this?

You can do something like this, this is a full toggle version:
$("#mySelector").animate({ height: 'toggle', opacity: 'toggle' }, 'slow');
For strictly a fadeout:
$("#mySelector").animate({ height: 0, opacity: 0 }, 'slow');

Directly animating height results in a jerky motion on some web pages. However, combining a CSS transition with jQuery's slideUp() makes for a smooth disappearing act.
const slideFade = (elem) => {
const fade = { opacity: 0, transition: 'opacity 400ms' };
elem.css(fade).slideUp();
};
slideFade($('#mySelector'));
Fiddle with the code:
https://jsfiddle.net/00Lodcqf/435
In some situations, a very quick 100 millisecond pause to allow more fading creates a slightly smoother experience:
elem.css(fade).delay(100).slideUp();
This is the solution I used in the dna.js project where you can view the code (github.com/dnajs/dna.js) for the dna.ui.slideFade() function to see additional support for toggling and callbacks.

The accepted answer by "Nick Craver" is definitely the way to go. The only thing I'd add is that his answer doesn't actually "hide" it, meaning the DOM still sees it as a viable element to display.
This can be a problem if you have margin's or padding's on the 'slid' element... they will still show. So I just added a callback to the animate() function to actually hide it after animation is complete:
$("#mySelector").animate({
height: 0,
opacity: 0,
margin: 0,
padding: 0
}, 'slow', function(){
$(this).hide();
});

It's possible to do this with the slideUp and fadeOut methods themselves like so:
$('#mydiv').slideUp(300, function(){
console.log('Done!');
}).fadeOut({
duration: 300,
queue: false
});

I had a similar problem and fixed it like this.
$('#mydiv').animate({
height: 0,
}, {
duration: 1000,
complete: function(){$('#mydiv').css('display', 'none');}
});
$('#mydiv').animate({
opacity: 0,
}, {
duration: 1000,
queue: false
});
the queue property tells it whether to queue the animation or just play it right away

Throwing one more refinement in there based on #CodeKoalas. It accounts for vertical margin and padding but not horizontal.
$('.selector').animate({
opacity: 0,
height: 0,
marginTop: 0,
marginBottom: 0,
paddingTop: 0,
paddingBottom: 0
}, 'slow', function() {
$(this).hide();
});