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Animation not being made jquery (backgroundColor)

I'm having a problem where I'm making a function in JavaScript (JQuery):
$('.login').click( function() {
$('#login-container').animate({
left: 0
}, 300, "swing", function(){
$('#login-container').animate({
backgroundColor: 'rgba(0,0,0,0.4)'
}, 2000, "swing");
});
});
Whereas "login" is a button and login-container is a big div which contains a form which people can use to login.
I'm trying to make the giant container that slides over the page only turn its background color to lower the website's exposure but it's working and as far as I know, the code is correct.
The first animation happens but the second one (referring to the backgroundColor) doesn't even start at all.
Thanks in advance
EDIT:
I've simplified my code to see if it was a problem of my syntax or JS simply not applying this animation:
$('.login').click( function() {
$('#login-container').animate({
backgroundColor: 'rgba(0,0,0,0.4)'
}, 2000, "swing");
});
And the element does not have its background-color applied, for some reason.

I don't actually get what you're trying to say here, but if you want to toggle that animation you can use $.toggle() of jquery after the user clicks.
If you want to animate this stuff, look at this documentation provided by jQuery
jQuery Animation

Velocity.js - Buggy looping animation?

I have been testing a theory design for an animated mouse to indicate that the user of a website can scroll downwards. It's not complicated, and I've come up with a design which should be re-usable...
However for some reason if I try to clone the element and append it, it no longer get animated visually? However if I $.click() with jQuery, it fixes after one iteration.
Perhaps this is just a browser render issue? Please let me know if you cannot replicate the problem! Cheers
jsfiddle: https://jsfiddle.net/xw39e0bs/4/

Turns out that velocity calculates the start point based on current CSS values. So if you clone a moving element mid-motion, that will become the new start point. Therefore, one way to fix this is to provide forcefeeding.
Working example:
function mouse(){
$(".mouse .ball").velocity({
top: ["45%","25%"] //[TARGET_VAL,START_VAL]
},{
duration: 800,
easing: "swing",
}).velocity("reverse",{
delay: 2000,
complete: function(){
mouse();
}
});
}
mouse();
$("#clone").click(function(){
$(".mouse").last().clone().appendTo("#mice");
});
https://jsfiddle.net/xw39e0bs/5/

In this version we're reassigning the selector to bring in the cloned items. All of the clones then animate as expected.
complete: function(){
sel = $(".mouse .ball");
mouse();
}

Using jquery.effects.slide, how to combine direction, speed, and completed function?

I found jquery.effects.slide works according to what I need. But I am having trouble figuring out how to combine all possible arguments with a completed function.
For example, this basically does what I want, slide a div from left to right:
$("#companyinfo").show('slide', function(){
//do stuff here as a condition of the completed slide effect.
});
But when I introduce a speed of 500, it doesn't seem to recognize the additional argument:
$("#companyinfo").show('slide', 500, function(){});
And what if I want to change the direction?
$("#companyinfo").show('right', 'slide', 500, function(){});
The additional argument "right" breaks the slide effect.
So, I need to use show with: direction, speed, and completed function.

$("#companyinfo").show("slide", {direction: 'right'}, 500, function() {
//callbacks
});

Vanilla jQuery doesn't have slide effects, but jQuery UI does.

Duration of jQuery events not equal

I have two lines of code firing on the click of a div. They do what I want them to, but it seems that the timing of them is out of sync. These are the two lines.
$('#tourPage').show("slide", { direction: "right" }, 500);
$('#navigationRight').animate({marginLeft: '-1240px'}, 500);
I have the duration of both of them set to 500, but they don't move together. There seems to be some sort of separation or something between them. I haven't had this trouble before. I used this and it works just fine.
$('#aboutPage').animate({width: 'hide'}, 500);
$("#navigationLeft").animate({marginLeft: '0px'}, 500);
Those two elements do move together when clicked.
Any ideas why time is different in the first case?
Thanks

jump sections before starting scrolltop animation

I am attempting to use skrollr and jquery to create a sidescrolling choose-your-own adventure type thing. With my microscopic skills in javascript (trying to improve it) I have managed to work things out except for one thing.
I am animating scrolltop to make the sections play, however, I want to be able to jump sections before playing. since skrollr "plays" everything sequentially, then scolltop naturally wants to "play" everything in between where you are and the "target". I would like to know how to tell scrolltop to check where it is, compare this to the target, and if sections are in between to skip them before it starts the scroll animation.
I guess this is mainly a jquery question. To give you an idea, im using simple jquery like:
$('#chapter4a').on('click', function() {
$('html, body').animate({ scrollTop: 2750 }, 5000);
});
what if I am at 0, want it to animate to 200 over 500ms, then skip to 2000 and animate to 2700 over another 1000ms. What would that logic look like?
Thanks in advance.

jQuery allows you to have different easing in the animations. Maybe worth to take a look at it, it might have what you need and then you don't need to code so much.
But, to answer you question, this should work:
$('#chapter4a').on('click', function() {
$('html, body').animate({ scrollTop: 200}, 500,function() {
$('#chapter4a').scrollTop(2000);
$('html, body').animate({ scrollTop: 2700}, 1000);
});
});