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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();
}

jQuery hover animation queue

Having some trouble fully understanding how animations in jQuery are queued and initialized. Trying to get more comfortable with the concept by writing some button effects.
I want to turn the code from the pen below into a smooth animation (as you can see if you hover over the button multiple times you run into some issues) that executes each animation on hover in ONLY when there is not another animation going on, and then execute hover out animations ONLY when the hover in animation finishes.
Here is my code: http://jsbin.com/larukayi/1/edit
Thanks in advance for any help!

I think below changes give you the expected result:
button1.css("cursor", "pointer").hover(
function(){
slideup.stop(true).animate({
"bottom":"0px"
}, 150, 'linear');
slideup.delay(100).animate({
"left":"50px"
},150,'linear');
slideright.delay(550).animate({
"left":"0px"
}, 100, 'swing');
},
function(){
slideright.stop(true).animate({
"left":"-50px"
},150,'linear');
slideup.delay(100).animate({
"left":"0px"
}, 150, 'linear');
slideup.delay(100).animate({
"bottom":"-100px"
},150,'linear');
});

Image jQuery Sliding not working

I'm trying to make an image slidein on page load but it doesn't seem to work at all. The delay has no problem but the sliding effect doesn't do anything. Any help would be greatly appreciated.
$(function() {
$(".bgslide").one('load', function () {
$(this).delay(1000).show("slide", { direction: "left" }, 'linear', 2000);
}).each(function() {
if(this.complete) jQuery(this).load();
});
});
Here is a link to a jsfiddle as well: http://jsfiddle.net/cDYvh/

The slide effect comes with jQuery UI which you didn't include: http://jsfiddle.net/cDYvh/1/

You could also use $.animate() to avoid including jQuery UI. For example, you could accomplish your example with something like this:
$(this).animate({ left: 2000px });
Note: You'll probably need to apply position:absolute to the elements. Other items can be animated as well, including color, opacity, etc.
Animate Example

jQuery - Fading animation on hover

I have a little jQuery animation which fades in a link when hovering an :
$(function() {
$('.delete').hide();
$('#photos img').hover(function() {
$(this).parents('li').children('.delete').fadeIn('fast');
}, function() {
$(this).parents('li').children('.delete').fadeOut('fast');
});
});
But if I quickly move my mouse in and out of the image, the new animation is always added to the queue and when I stop I can see the link pulsating for a while. I tried using .stop(true), but then sometimes the fade in effect doesn't work at all (or just up to some opacity value less than 1). What can I do?
Thanks, Eric

The best way is to use hoverIntent plugin. This deals with the issues above. It also adds a slight delay to the animation so if a user happens to quickly move the mouse over all the links you do not get an ugly animation flow of all the links.

One way to prevent such problems occuring is to use stop() in conjunction with fadeTo(), as in the snippet below:
$(function() {
$('.delete').fadeTo(0, 0);
$('#photos img').hover(function() {
$(this).parents('li').children('.delete').stop().fadeTo('fast', 1);
}, function() {
$(this).parents('li').children('.delete').stop().fadeTo('fast', 0);
});
});
Hope this solves your issue!