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How to keep sticky navbar within defined body width?

My sticky navbar goes from body width (max 1450px) to 100% screen width when scrolling. https://biogenity.com/RC19/index.html
I've defined the body width using CSS:
body {
max-width: 1450px;
}
For the sticky navbar I currently use 100% width, but it doesn't apply within the width of body. I'm not quite sure what to use instead.
.sticky.is-sticky {
position: fixed;
left: 0;
right: 0;
top: 0;
z-index: 1000;
width: 100%;
}
Could this maybe be fixed through the .js?
$(document).ready(function () {
// Custom function which toggles between sticky class (is-sticky)
var stickyToggle = function (sticky, stickyWrapper, scrollElement) {
var stickyHeight = sticky.outerHeight();
var stickyTop = stickyWrapper.offset().top;
if (scrollElement.scrollTop() >= stickyTop) {
stickyWrapper.height(stickyHeight);
sticky.addClass("is-sticky");
}
else {
sticky.removeClass("is-sticky");
stickyWrapper.height('auto');
}
};
// Find all data-toggle="sticky-onscroll" elements
$('[data-toggle="sticky-onscroll"]').each(function () {
var sticky = $(this);
var stickyWrapper = $('<div>').addClass('sticky-wrapper'); // insert hidden element to maintain actual top offset on page
sticky.before(stickyWrapper);
sticky.addClass('sticky');
// Scroll & resize events
$(window).on('scroll.sticky-onscroll resize.sticky-onscroll', function () {
stickyToggle(sticky, stickyWrapper, $(this));
});
// On page load
stickyToggle(sticky, stickyWrapper, $(window));
});
});
Thanks in advance.

By using position:fixed you remove the element from the normal document flow so I don't believe the body styles apply.
From position - CSS: Cascading Style Sheets | MDN
The element is removed from the normal document flow, and no space is
created for the element in the page layout.
So you should set the max-width for it and allow it to be centered by setting left and right to auto:
.sticky.is-sticky {
position: fixed;
max-width: 1450px;
left: auto;
right: auto;
top: 0;
z-index: 1000;
width: 100%;
}

jQuery CSS method update on resize?

After struggling to vertically centre a div inside the body element using the "conventional" methods, I've decided to create a small jQuery function that figures out how far from the top an element needs to be to be "centred".
It works like this:
Get container height,
Get child height,
"top" = "(container.height - child.height) / 2"
Set margin top of child to the value of "top".
For example if the body had a width and height of 1000px and this body had a div.inner child that had a width and height of 400px the margin-top of div.inner would be 300px because (1000-400) / 2 = 300.
Here is a diagram to further explain what I mean:
NOTE: X represents the margin-top of the div.inner (as I didn't have enough space for "Margin Top = ").
To my amazement this actually works!!! Here is the test code:
// set the margin top for ".vertical-centre" elements
$(".vertical-centre").each(function() {
// set the margin-top for the child
$(this).css("margin-top", function() {
// NOTE: margin = (container.height - child.height) / 2
var margin = ($(this).parent().height() - $(this).height()) / 2;
// default the margin to zero if it's a negative number
// round the margin down to the nearest whole number
// specify that the margin-top is in pixels
return Math.floor(Math.max(0, margin)) + "px";
});
});
body {
width: 100px;
height: 100px;
margin: 0;
padding: 0;
border: 1px solid black
}
div.inner {
width: 40px;
height: 40px;
background-color: blue
}
.horizontal-centre {
display: block;
margin-left: auto;
margin-right: auto
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="inner horizontal-centre vertical-centre"></div>
NOTE: I made the example above smaller so you could see it properly.
Unfortunately though, there is now another problem, when I resize the browser the margin-top of the div.inner element stays the same.
I would like for it to be responsive and update it's margin-top property to the appropriate value when the window has been resized otherwise div.inner will go out of view and the page will look a like this:

You could use https://api.jquery.com/resize/
Create a function of your code
function init_center() {..
Try calling the init_center function from the resize event of window
SNIPPET
function init_center() {
// set the margin top for ".vertical-centre" elements
$(".vertical-centre").each(function() {
// set the margin-top for the child
$(this).css("margin-top", function() {
// NOTE: margin = (container.height - child.height) / 2
var margin = ($(this).parent().height() - $(this).height()) / 2;
// default the margin to zero if it's a negative number
// round the margin down to the nearest whole number
// specify that the margin-top is in pixels
return Math.floor(Math.max(0, margin)) + "px";
});
});
}
$( window ).resize(init_center); // Handle resize of window
init_center(); // Doing it first time
body {
width: 400px;
height: 400px;
margin: 0;
padding: 0;
border: 1px solid black
}
div.inner {
width: 200px;
height: 200px;
background-color: blue
}
.horizontal-centre {
display: block;
margin-left: auto;
margin-right: auto
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="inner horizontal-centre vertical-centre"></div>

Wrap you code in a function
function align() {
$(".vertical-centre").each(function() {
// set the margin-top for the child
$(this).css("margin-top", function() {
// NOTE: margin = (container.height - child.height) / 2
var margin = ($(this).parent().height() - $(this).height()) / 2;
// default the margin to zero if it's a negative number
// round the margin down to the nearest whole number
// specify that the margin-top is in pixels
return Math.floor(Math.max(0, margin)) + "px";
});
});
}
And run it on window resize as well
align(); // first run
$(window).on('resize', align); // when window resize

How to get the height and width of window in bootstrap

In bootstrap I have a fixed top nav bar and fixed bottom nav bar. I want to show a large image in the background between the space of those two nav bars and I also want to cover the width of the window. How can I dynamically get the height between the navbars and the width of the window? The window size may change depending on device.So I need it dynamic

Requires jquery:
var viewport = {
width : $(window).width(),
height : $(window).height()
};
//can access dimensions like this:
//viewport.height
Though you won't always get perfect results, different devices behave differently and this gives the viewport dimensions, not the screen dimensions.
Alternatively you could check the width of a data-role="page" element to find the device-width (since it's set to 100% of the device-width):
var deviceWidth = 0;
$(window).bind('resize', function () {
deviceWidth = $('[data-role="page"]').first().width();
}).trigger('resize');​​​

$(window).resize(function() {
var top_nav_height = $("#id_of_top_nav").height();
var bottom_nav_height = $("#id_of_bottom_nav").height();
var window_height = $(window).height();
var height_of_open_space = window_height - (top_nav_height+bottom_nav_height);
$("#id_of_img").css({
height:height_of_open_space+'px';
});
});
this will be fine with if 0px padding and margin, if not also get that values and subtract from height_of_open_space before applying to img height

It is a bit hard to tell without seeing any of your markup, but it should be feasable with pure css. I set up a very basic example to demonstrate:
http://codepen.io/anon/pen/XbGJJO
HTML:
<div class='top'>
top navbar
</div>
<div class='content'>
<p> some content </p>
</div>
<div class='bottom'>
bottom navbar
</div>
CSS:
.top, .bottom {
height: 40px;
background: red;
position: fixed;
width: 100%;
}
.top {
top: 0;
}
.bottom {
bottom: 0;
}
.content {
margin: 40px 0;
min-height: calc(100vh - 80px);
background: green; /* background goes here */
}
The trick lies in the following line:
min-height: calc(100vh - 80px);
This tells your content to at least take up 100% of the vertical height, minus the height of the top and bottom bar. Let me know if you want me to explain further.

Create circle that is proportionately sized to window

I am attempting to create a circle with a height of 10% the browser window. If I also make the width 10%, and you scale the browser, you get a misshapen or squished circle. I want to try to create the width of the circle with jquery to change in proportion with the height. so if 10% converts to 200px height, the width would be changed to 200px. I have tried a few solutions, but keep getting a width of 0px in return.

assuming you are using jQuery and your circle is an HTML element you could do this:
var $window = $(window),
$el = $('#someElement');
$window.on('resize', function () {
var size = $window.height() * 0.1;
$el.width(size).height(size);
});

Get the width and the height of the window and then simply check which one of them is the smallest. Get 10% of that value and use this as the circle's radius.

Little experiment using a transparent square image which is the direct child of <body>:
http://jsfiddle.net/2S3xU/3/
<html><body><img src="transparent-square.gif">
img {
border-radius: 99999px;
position: absolute;
top: 0; left: 0;
height: 100%; /* width will follow height to keep image undistorted*/
max-width: 100%;
max-height: 10%;
}​
/* Opera fix*/
body, html {
width: 100%;
height: 100%;
}

why my container is not coming in center

i want to open a div in center of my screen ( horizontally and vertically).
var documnetWidth = $(document).width(),
documentHeight = $(document).height(),
widgetFormHeight = widgetForm.height(),
widgetFormWidth = widgetForm.width();
widgetForm.css({
top: documentHeight / 2 - widgetFormHeight / 2,
left: documnetWidth / 2 - widgetFormWidth / 2
});
my widget is coming horizontally center but vertically it takes some offset.

you can do this
define a size for the DIV and position Fixed, like this:
div {
position: fixed;
top: 50%;
left: 50%;
width: 200px;
height: 100px;
margin: -100px 0 0 -50px;
z-index: 99;
}
Or if you don't want to place it absolutly positioned, you can give it a width, and set it to:
div { margin: 0 auto; }

Try this:
documentHeight = $(window).height(),
instead of:
documentHeight = $(document).height(),
The way you had it you were getting the height of the document which could be more or less than the browser height.
And then to allow for how far the document is currently scrolled:
top: documentHeight/2-widgetFormHeight/2 + $(document).scrollTop(),
Demo: http://jsfiddle.net/vULHL/

Absolutely centered DIV without width or height:
http://jsfiddle.net/dFkXq/1/
And acts like a fixed element.