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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

if / else in jquery animation not working

I'm trying to use an if statement in jQuery to animate a div and all that's inside of it. I'm using code that's worked in other instances. For some reason the else statement has no effect, is it something about using it with animation?
$(document).ready(function() {
$('.container ').on('click', enlarge);
function enlarge() {
if ($(this).css('font-size') != '100%')
$(this).animate({ 'font-size': '100%' }, 1000);
else
$(this).animate({ 'font-size': '62.5%' }, 1000);
};
});
The if works fine. The container loads on the page at 62.5%, and clicking on it enlarges it to 100%. Now I want to shrink it if someone clicks a second time, thus the else. But nothing happens on the second click.
If I take out the word else, then on click it enlarges to 100%, then shrinks back down again to 62.5%, which makes sense. But so the shrinking code works.
I also tried including the following in place of else, but same result, nothing.
else if
($(this).css('font-size') == '100%')

$(this).css('font-size')
above code returns 'px' value.
if you want to get percentage value use this
$('.container')[0].style.fontSize

why the animation do not work properly in my slider?

I have a jQuery simple slider it has 15 picture each five show in a slide. I have a previous button and next button.
Each next click generate a left movement by 855px with a slider animation.
Each previous click generate a right movement by 855px with a slider animation.
This is my jQuery code :
$(document).ready(function(){
$(".prev_button").click(function(){
$("ul.slider").animate({
left: "+=855"
}, 3000, function(){
$("ul.slider").css('left', '0');
li_no = 0;
$("ul.slider").find("li").each(function(){
li_no = li_no + 1;
});
slide_after_this = li_no - 6;
$('ul.slider li:gt('+slide_after_this+')').prependTo('ul.slider'); // << line changed
});
});
$(".next_button").click(function(){
//alert($("ul.slider").css("right"));
$("ul.slider").animate({
right: "+=855"
}, 3000, function(){
//alert($("ul.slider").css("right"));
$("ul.slider").css('right', '0');
$('ul.slider li:not(:nth-child(n+6))').appendTo('ul.slider');
});
});
});
Now I have two problems :
First one is with the previous button (left arrow) When I click it the animation shows and the elements changed but they do not wrapped with each other (I mean does not show the last elements immidiatly before the first element). I can not find the reason of this.
Second problem is with both right and left arrows it is like following :
If I click just the right arrow the slider working fine it animates and change the elements but If I click the both button in order (I mean right then left or left then right ) the elements change but the animation does not show. but I check if the routine go inside the animate function by some alerts and it is going inside but does not animate on the screen .
This is a link that may help you:
http://jsfiddle.net/mpx83tpv/18/

you are really close try overflow:hidden for .slider_container
div.slider_container
{
height:380px;
width:855px;
margin-left:auto;
margin-right:auto;
overflow:hidden;
}
edit js:
also use below code as you are using both right and left in the end the slider has both of them one of them is always zero.
$(document).ready(function(){
$(".prev_button").click(function(){
$("ul.slider").animate({
left: "+=855"
}, 3000);
});
$(".next_button").click(function(){
//alert($("ul.slider").css("right"));
$("ul.slider").animate({
left: "-=855"
}, 3000);
});
});
if you want a infinite scrolling you need to use right and left in this case replace your $("ul.slider").css('right', '0'); line to $("ul.slider").css('right', ''); do same for left as well, as you need the remove them.
for adding the next visible div implement you logic before the animation as you callbacks do it after the animation.
the tricky part would be the prev button for this after calculation of the div count you also need the set new left without animation and then call left move animation.
hope these make sense.

jquery animate background-position - problem getting the current background position first

I am trying to animate the background of an element from it's current position when the user clicks a button. I am able to do this on the first click but the subsequent clicks fail.
Here's my code...
var testme;
$(document).ready(function(){
$(".navleft").live("click", function() {
testme = parseInt($(this).css("background-position").replace("% 0%", "").replace("px 0%", ""));
$(this).parent().animate({backgroundPosition: (testme + 297) + "px"}, 500);
$(this).parent().find("p").text(testme);
});
});
EDIT:
$(".navleft").live("click", function() {
$(this).parent().animate({backgroundPosition: "+=297"}, 500);
});
As suggested below, this works great unless you're using IE where it resets back to 0 at each click then animates again.
Here's a link to what I mean... http://jsfiddle.net/TdaSV/
Solution (as a result of being pushed in the right direction):
$(".navleft").live("click", function() {
$(this).parent().animate({'background-position-x': '+=297'}, 500);
});

You should first stop the previous animation and then start a new one:
$(this).parent().stop(true, true).animate({backgroundPosition:...
also if you need to add 297 pixels to the current background position, you don't need to read the current position, following shoudl work:
$(this).parent().animate({backgroundPosition: "+=297"}, 500);
see more examples in jquery website.

Div width expand/shrink on click

For a site I'm making for myself and a friend, I have a div container/wrapper with 2 other divs within it: one occupies the left half and has a black background and the other occupies the right with a white background. Essentially, this lets me get a split colored background. Each div holds half of a logo. Here's the page, temporarily hosted so you guys can see it.
http://djsbydesign.com/tempsite/index.htm
At any rate, I'd like to have links on the left and right hand sides of the page that, on click, cause their respective divs to expand from 50% to 100%. I have a few ideas, but am not sure entirely how to go about doing this (I'm rather new to javascript). The first would be to have the expanding div's z-index set to something higher than the non-expanding one, and then have it expand (somehow), and the other is to have the expanding div expand to 100% while the other shrinks to 0% at an equal rate.
The bottom line is, I have no idea how to go about doing this. I don't mind using mootools or jQuery, for the record.

The following seems to work:
$('#left-bg, #right-bg').click(
function(){
$(this).animate({'width': '100%'},600).siblings().animate({'width':'0'},600);
});
Albeit I'm not sure how you'd plan to bring back the the 'other' div.
JS Fiddle demo.
Edited to add a button (via jQuery) that allows both divs to be reverted to original dimensions:
$('#left-bg, #right-bg').click(
function(){
$(this).animate({'width': '100%'},600).siblings().animate({'width':'0'},600);
$('<button class="show">Show all</button>')
.appendTo('#wrapper');
});
$('.show').live('click',
function(){
$('#left-bg').animate(
{
'width': '50%'
},600);
$('#right-bg').animate(
{
'width': '50%'
},600);
$(this).remove();
});
Updated JS Fiddle.
Edited to address the question left by OP in the comments:
is there a way to have a page redirect after the animation completes?
Yep, just add the line window.location.href = "http://path.to.url.com/";
$('#left-bg, #right-bg').click(
function(){
$(this).animate({'width': '100%'},600).siblings().animate({'width':'0'},600);
$('<button class="show">Show all</button>')
.appendTo('#wrapper');
window.location.href = "http://www.google.com/" // <-- this line redirects.
});
$('.show').live('click',
function(){
$('#left-bg').animate(
{
'width': '50%'
},600);
$('#right-bg').animate(
{
'width': '50%'
},600);
$(this).remove();
});
Updated JS Fiddle.
Edited in response to bug report (in comments):
The one other bug (easy fix) is that any time you click on either of the divs, it creates a new button. So say you clicked on the left half, and it expanded and filled the page, etc., and then you clicked on it again (it being anywhere on the page now). It would attempt to add a second button.
To prevent a second button being added to the div just add an if:
$('#left-bg, #right-bg').click(
function(){
if (!$('.show').length) {
$(this).animate({'width': '100%'},600).siblings().animate({'width':'0'},600);
$('<button class="show">Show all</button>')
.appendTo('#wrapper');
window.location.href = "http://www.google.com/" // <-- this line redirects.
}
});
Which, will only append a button, or indeed animate the divs, so long as the $('.show') selector returns no matches.
However if you're also redirecting to another page by clicking the button it shouldn't be an issue anyway, since none of the jQuery on the original page will exectute/be able to access the page to which the user is redirected (unless it's a page on your own domain, and you've explicitly chosen to add the same button).

If you give absolute positions to your div's such that - 1st is positioned at top left corner and other is positioned at top right corner. And then in click event you can change the position of the other top corner of the div to be expanded.
You can use jquery to do this easily. Check jquery documentation for setting css.

Looks like you've got jQuery included, so use that! It's totes the easiest library to do simple animations with.
Here's an example click function that will slide the right background to be 100% like you said:
$('a#link').click(function(e) {
e.preventDefault();
$('#left-bg').animate({ width : '0%' }, 'slow');
$('#right-bg').animate({ width : '100%' }, 'slow');
});
Obviously to go in the other direction you'd switch the width values in the object passed to the animate functions.
If you're not familiar with the animate function, check the docs, but basically you just pass CSS rules in a key : value object to it, and it'll change the CSS values over time - animating it!
Hope this helps!