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Html, css, and jQuery. Something isnt working in my code

I'm new to jQuery and watching a tutorial for a sticky nav bar and something went wrong and idk what to do!
In my Script file I have it so it runs this code on load [http://pastebin.com/XYWR5tKJ][1] and I have a class in css to use with the nav Placeholder wrap.
Well the margin property doesn't seem to be working, if you run the site and scroll the whole way down the nav bar sticks to the side, its supposed to be centered(the margins job). I have no idea why its not doing it, its probably something stupid but please help!`
HERES THE CODE__
Script.js: http://pastebin.com/XYWR5tKJ
Css: http://pastebin.com/Y51rYJVE
HTML: http://pastebin.com/tTftEJKh
__
THANKS!
[1]: http://pastebin.com/tTftEJKh

Basic set up for a fixed, centered element is:
Containing element that is position fixed.
An element within that has margin:0 auto; and a set width.

I'd say that your left:0 inside fixed is counteracting things mostly.
Since you didn't specify responsive is this good enough for you?
http://jsbin.com/nevuqi/4/
Also probably better, as a tip to share code in something like a JSFiddle, Codepen or JSBin to name a few... good for learning inside of too.

This question reminded me of a JSFIDLE I made a while back to learn the same concept. I've updated it with comments to make it more readable...
It doesn't really answer your question but I thought it would help understand the various components involved when implementing the sticky nav effect in JQuery for anyone who comes across this thread who is unsure.
JavaScript/JQuery code:
(refer to jsfiddle for the accompanying html/css )
//window - the container that holds and renders the document.
//document - the rendered html within the window. the document can be bigger than the window as with this example as scrolling is needed..
//refer to css for more info on the appended classes to nav bar and proceeding element.
$(document).ready(function () {
//add a scroll function to the document that
$(document).on('scroll', function () {
//get the number of pixels that the window is from the top of the document. this is zero at first.
var scrollTop = $(this).scrollTop();
//insert the name of your sticky nav element here in place of .scrollFixed
$('.scrollFixed').each(function () {
//scrollFix variable is initialized as .scrollFixed object with all its attributes.
var scrollFix = $(this);
//gets offset of sticky nav element in pixels
var topDistance = scrollFix.offset().top;
var previousElement = scrollFix.prev();
//this is just for debugging and learning purposes.
$('.fixed_info').html('nav bar is ' + topDistance + ' pixels from top of document');
//if you put topDistance here instead of the number manually, the nav bar will flicker.
//unsure why..
//checks to see whether nav element has been scrolled past the top of window.
if ((298) < scrollTop) {
//make sticky nav a fixed element
scrollFix.addClass("stuck");
//extend the element below for this example so proceeding elements don't visually jump up
//when closing the empty gap.
$(".element_below_fixed_nav_bar").addClass("extend");
//indicates element is fixed!
scrollFix.html("Element now fixed!");
//you will have to manually put the topDistance here as well...
//this checks whether the nav element's original top has passed the top of
//the enclosing window.
//it needs to become scrollable again
} else if (298 >= scrollTop && scrollFix.hasClass('stuck')) {
//make sticky nav a scrollable element
scrollFix.removeClass('stuck');
//make proceeding element shorter to compensate for sticky nav pushing elements below it down.
$(".element_below_fixed_nav_bar").removeClass("extend");
//indicates element is scrollable!
scrollFix.html("Element now moveable!");
}
});
});
});
It's very similar to the logic behind the JavaScript code you linked.
find number of pixels of window from top of document. starts at 0 when document first loads unless otherwise coded. This updates every time you scroll.
find (offset) number of pixels of nav bar element from top of document.
check if nav bar has reached the top of the window by checking its offset to the window. If it is then make it fixed.
check whether the nav bar's original offset has fallen below the top of the window. If it has then make the nav bar scrollable.
It doesn't really answer your question but I thought it would help understand the various components involved when implementing the sticky nav effect in JQuery for anyone who comes across this thread who is unsure.

Trying to turn fluid width div into 100% wide modal

You can see an example of what I've got now here.
I'm trying to get the div that's 'full' to expand from the middle out, pushing the others out of the way in the process. What I've got now will push them to the left edge and then expand them. I know that this is because I've got position:absolute. Any ideas on how I can acheive this effect?

Here is a working example of what I think you are describing: http://codepen.io/anon/pen/pKfAw
I removed display: table from div and set .min, .min p to width 0px with an overflow hidden and removed height 0%.
The issue why it was jumping is because you set all the min to 0 with the full floating left. That automatically pushed it to the left and then expanded out. Now all the divs are animating to 0 while .full is animating to 100%.

Not sure what you mean by "expand from the middle out". Here is a quick fix for your js:
$('div').on('click', function(){
var $this = $(this);
$this.toggleClass('full');
$this.siblings().toggleClass('min');
});
This only adds full class to the div which was clicked.

How to keep div in the center of viewport

I am creating a feedback system for one of my projects. My target device is iPad. Basically what happens is a div called into the page via ajax and it is supposed to overlay the content underneath. I have that part working.
What I want to do is have the div locked to the middle of the view-port. I have tried position:fixed on my element which works, except it will lock into the wrong position. It seems to be centering itself to the initial position of the viewport. If I scroll down to the bottom of a longer page and call my feedback window, it will still be near the top.
Ajax Page (this runs when the page is called)
$(document).ready(function(){
$(".popup").css({
top: "50%",
left: "50%",
marginLeft: -$(".popup").width() / 2,
marginTop: -$(".popup").height() / 2
});
});
If I can find the top of the viewport I think I'd be able to get this working right.
I've looked into: http://www.appelsiini.net/projects/viewport but it doesn't really solve my problem.
Any help, advice or pointers in the right direction would be greatly appreciated! Thanks!

Fixed positioning is applied relative to the top-left corner of the window, regardless of how far down you're scrolled (which I assume is what you want).
So:
.popup {
position:fixed;
top:20px;
left:40px;
right:40px;
}
Will, first of all, put your popup 20px from the address bar (meaning, even if you scrolled to the bottom).
Next, setting both left AND right will "stretch" the fixed element to start and end 40px (or whatever you give it) from both sides of the window. That's a convenient way of centering this popup div.
If your popup needs to be a fixed size – not stretched based on the width of the window – you could set both the left and right (to zero probably) and then inside this div, have another div with margin:0 auto, which will center that inner div within the fixed outer div.
P.S.
Just as you can set both left and right, you can also set both top and bottom, which will have corresponding results. However, if you need a fixed height, you won't be able to vertically center it using the margin:auto trick.

Don't know if it's the case, but If $(".popup") it's initially hidden by display:none, then it's width and height will be zero on page load.

div container following scroll of screen

I'd like to set up a "backward-compatible" scrolling sidebar on one of my pages.
I have a page containing information about a species of fish which can be extraordinarily long and images to accompany it.
The images are in the right-hand pane at the moment and I'd like them to follow the user as they scroll to the bottom of the page.
I've used the following code with some success:
jQuery().ready(function($) {
var $scrollingDiv = $("#sidebar");
$(window).scroll(function(){
$scrollingDiv
.stop()
.animate({"marginTop": ($(window).scrollTop() + 30) + "px"}, "slow" );
});
});
But it jumps too far when scrolling down.
(original position)
(scrolled a single mousewheel click)
When you start scrolling down the page, the sidebar appears around half-way down and as such you can only see two of the images.
Once a user scrolls past X point (say 400px), I would like the sidebar to start moving with the page. However, it also needs to go back to its original position when the user reaches the top of the page once more.
Is there a fix that can be applied to this code, or a better way of approaching this?
---------------------------------------------------------------------------------
EDIT: position:fixed Problem
When I try to apply position:fixed as per Josh and David's suggestions (either bit of JS code), this happens:
Here is Firebug's read-out of the CSS styles attached to this element:

You can use a plugin for this, but it’s such a simple task that you might as well do it on your own.
Consider this simple markup:
<div id="content">Content</div>
<div id="sidebar"><div>Sidebar</div></div>
And this would be all the javascript you need:
var el = $('#sidebar'),
pos = el.position().top;
$(window).scroll(function() {
el.toggleClass('fixed', $(this).scrollTop() >= pos);
});
Now, it will add a class to the #sidebar div as soon as the user scroll further than the sidebar is positioned, so all you need now is som CSS. I’m applying the fixed positioning to a child element to avoid layout problems:
#sidebar.fixed > div{position:fixed;}
I put up a really simple demo here: http://jsfiddle.net/QZyH3/

You should try the jQuery code found in this tutorial, which replicates Apple's shopping cart sidebar. It has a working demo and a very small code footprint.

why not use css position: fixed; property? of course if you don't mind the div being not smooth but straightly following your scrollTop. I've found it not working only in IE6-- by today, so using fixed position is a good solution I think, otherwise you just get with window.scrollTop of DOM and assign it to your element's absolute position top

jquery animate from center to far left or far right (off screen based on doc width)

I have a fixed width element that I want to essentially shoot off the screen either to the left or to the right, I want it to be seen visually though hence the use of animate. However its not working out as planned with my current attempts.
What it currently seems to be doing is jumping to the opposite side of the screen then panning across in the direction I want. However what I want it to do is from where it sits go across the screen
$('.element').animate({'marginLeft':($(document).width())+'px'},1000, function(){$('#dashboardWidgetContainer').hide().html('')});
that is what I am attempting to use to achieve my desired goal
a sample of the layout would be
<div id="container">
<div class="element"></div>
</div>

set it a fixed position first
go:
$el = $('.element');
$el.css({
position: 'fixed',
top: $el.offset().top,
left: $el.offset().left
}).animate({left:'100%'}, 1000);

Are you trying to achieve something like this:
http://jsfiddle.net/t2FxV/

If it is jumping across the screen it probably has to do with margin changing from auto to 0, like in this example: http://jsfiddle.net/Paulpro/t2FxV/1/.
Make sure you set the marginLeft to the current position before animating:
$('#element').css('marginLeft', $('#element').position().left).animate({'marginLeft':($(document).width())+'px'},1000, function(){$('#container').hide().html('')});
http://jsfiddle.net/Paulpro/pakCP/
Your script works fine as jdavies pointed out (post deleted?), you might need to change the dashboardWidgetContainer to a selector for an element that exists. One thing you should note is that if you don't plan on reinserting the element into the page you should replace .hide().html('') with .remove() as it's much cleaner to remove the element from the DOM altogether than leave it sitting out there with display: none; and no contents.
$('#element').css('marginLeft', $('#element').position().left).animate({'marginLeft':($(document).width())+'px'},1000, function(){$('#container').remove()});