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Slide up a "fixed height div" that splits a web page horizontally?

I need a box that slides up from the bottom of my page. I will use the box to show important information to new users. So for example, immediately after signup, the box will slide up with a welcome message.
I've made this jsfiddle that to some extend exemplifies the desired behaviour. It's just a div that gets slided up from the bottom:
$('.foot').addClass('slide-up', 500, 'easeOutBounce');
However, the code is only to exemplify, because the implementation is insufficient for the following reasons:
The bottom box has a pre-determined 500px height, because it's initially hidden 500px below the browser. Instead, I need just the box height to fit its content. The content will vary, and will even be changed through javascript once loaded.
The bottom box emerges on top of other elements. Instead, I want to split the screen in 2. A bottom half that has as much height as the box content needs. And a top half that behaves just like a regular web page, i.e. if there is too much content the user can just scroll down. To exemplify the described effect you can check this jsfiddle (the code has no relevance though)
How could achieve the described behaviour?

After experimenting with several methods, I ended up with a solution that combines some ideas given in freedomm-n's comments (modify the size of the main div) and in Nikhil's answer (use a flex container). You can see the result in this jsfiddle.
For the following markup:
<div id="divContainer">
<div id="divTop">
Main content
</div>
<div id="divFooter">
Footer content
</div>
</div>
And these styles:
html, body, form
{
margin: 0;
padding: 0;
overflow: hidden;
height: 100%;
}
#divContainer
{
width: 100%;
height: 100%;
}
#divTop
{
overflow-y: auto;
padding: 8px;
height: calc(100vh - 16px); /* Accounts for padding and border (if any) */
}
#divFooter
{
padding: 12px;
text-align: center;
border: 1px solid black;
border-top-left-radius: 25px;
border-top-right-radius: 25px;
}
.containerEnd
{
display: flex;
flex-direction: column;
}
.topEnd
{
height: auto;
flex-grow: 1;
}
This Javascript code is used to animate the div elements:
function slideUpFooter() {
var currentHeight = $('#divTop').height();
var footerHeight = $('#divFooter').outerHeight(true);
$('#divTop').animate(
{ height: currentHeight - footerHeight },
2000,
'easeOutBounce',
function () {
$('#divContainer').addClass('containerEnd');
$('#divTop').addClass('topEnd');
});
};
The function called at the end of the animation sets the flexbox parameters, to ensure that the footer sticks to the bottom of the page.

I have updated your Fiddle. Look below for details.
You don't need to use position: fixed for the .foot section, you could use position: relative instead. Since I noticed you were using flex, I took the liberty to fix this using the same.
Changes made
Firstly I suggest adding a div container, giving a class name say - container.
Make the container display: flex & change the default direction to flex-direction: column.
Now since you want the main-content to be scroll-able depending on its contents, you need to first set a height to this section with height: 200px; and then make it scroll-able using overflow-y: auto;
Let me know if you have any doubts.

How to use anchor tag to scroll within div, without autoscrolling entire page?

I would like to use anchor tags to scroll within a div on the webpage. However, when I click on the anchor tag, the entire page jumps to the anchor tag within the div.
The content within the div should scroll, without the body of the webpage autoscrolling.
I've been googling and trying to figure this out for weeks & have not yet found an acceptable solution. It seems to be a really commonly asked question, too.
I know very little about javascript, but from what I gather there seem to be two possible ways of accomplishing this:
1. To make the body of the page scrollable only by mousewheel/manually and not with anchor tags. This would apply to the body only and not other elements.
-or-
2. To scroll to the anchor tag within the div, and cancel the process before it affects the body.
A bonus would be if it did not add the anchor tag to the url.
Here are some additional links to similar questions, may have some ideas you could work with:
seems promising, could not get it to work
Scrolling within a div without moving page
uses event.preventDetfault() or event.returnValue = false
may work for body after anchor link scroll to right
http://js-unit-testing.com/2013/08/08/preventing-anchor-clicking-from-scrolling-to-the-top/
other ideas for similar problems
How to prevent page scrolling when scrolling a DIV element?
How to go to anchor tag in scrollable div without having the whole browser jump down?
How can I differentiate a manual scroll (via mousewheel/scrollbar) from a Javascript/jQuery scroll?
other approaches to similar question
HTML anchor link with no scroll or jump
Here is a sample HTML and CSS with the relevant elements. You may resize the browser window so that there is a scrollbar for the main page to see the undesirable autoscroll effect:
<html>
<body>
<div id="main">
<div id="mainwide">
<div id="left">
2
</div>
<div id="right">
<a id="link" name="2">2</a>
</div>
</div>
</div>
</body>
</html>
Here is the CSS
html {
background-color: LightGreen;
}
#main {
border: 1px solid black;
margin-top: 200px;
width: 500px;
height: 300px;
overflow: hidden;
}
#mainwide {
width: 1000px;
height: 300px;
}
#left {
background-color: MediumSpringGreen;
width: 500px;
height: 300px;
float: left;
display: inline;
}
#right {
background-color: MediumSeaGreen;
width: 500px;
height: 300px;
float: left;
display: inline;
}
a#link {
float: right;
margin: 0;
padding: 0;
}
Maybe you can gain some points for definitively answering this commonly asked question?

You can use the scrollTop function from Jquery to position the scrollable div exactly how you want it.
$( "#viv_button" ).click(function() {
var container = document.getElementById('col2');
var scrollTo = document.getElementById('viv');
container.scrollTop = scrollTo.offsetTop;
});
Here is a fiddle of it working
I used anchor tags to locate it, but you can use anything with an ID.

I found this occurred because there was a parent of the element within which you have your href='#id_of_element'.
To fix this....
// javascript
document.body.position = 'absolute';
// or css
.body {
position: absolute;
}
You could use fixed, or relative. But this stops the body ( main page ) from scrolling on selection of href somewhere within a child element.

Setting the margin of an img in Javascript

The code below adjusts the margin of an img, so it's centered in an div with width of 600px. It works in general, but sometimes it doesn't and a second call is required.
Edit: Forgot to mention: This function is triggered by another, who is setting the source of the image to another, therefore changing the image.
Any help?
function adjustMargin(imageId) {
var image = document.getElementById(imageId);
image.setAttribute("style", "margin: 0 " + (300 - image.clientWidth / 2).toString() + "px");
}
The not-so-well working example can be seen here.

use css:
#imgId {
margin: 0 auto;
display: block;
// you are subtracting 300px and dividing by 2
// so assume your image is 300px wide
width: 300px;
}
The img tag is an inline element and as margin: 0 auto will only work on block elements you have to include display: block on the img css.
An alternative to center inline elements is:
#imgId {
text-align: center;
}
Demo of both methods here

First - correct way for setting styles is:
image.style.margin = "margin: 0 " + (300 - image.clientWidth / 2).toString() + "px";
(well, maybe there is no difference, but .style propery is supposed to be used for changing style of elements with JS)
Second - are you sure image is already loaded when that code is executed? If no - image.clientWidth might be not available yet. You may need to use onload event to run that code when image is loaded for sure.
Third - as stated in Bruno's answer, margin:0 auto; will automatically place your image centered inside a div, so no JS required at all.
EDIT:
But with 3rd approach you have a problem because image is not a block element. In order to make it work do something like this:
<div style="
width: 600px;
"><img src="Bilder/re-tabouret/lukas_baumgartner_re_tabouret_1#b.jpg" alt="mainArticleImg" class="projektMainImg" id="01:00" style=""></div>
wrap image into div with specified width and update css like this:
img.projektMainImg {
margin: 0 auto;
max-width: 600px;
max-height: 400px;
display: block;
}
(see display:block added)
Or simply wrap image with a div with specified width and add text-align:center to its style (no display block and margins needed):
<div style="
width: 600px;
text-align: center;
"><img src="Bilder/re-tabouret/lukas_baumgartner_re_tabouret_1#b.jpg" alt="mainArticleImg" class="projektMainImg" id="01:00" style=""></div>
Wraper div is required in order to center image in left 600px area. Otherwise it will be centered relatively to <div class="projektImages">

Overflow scroll on y axis with fixed height

I have an apparently easy problem which is:
<div class="container">
<div class="a"></div>
<div class="b"></div>
<div class="c"></div>
</div>​
I have 3 divs inside a container: A and B have fixed heights. C must have an extendable height, it extends along with the container height. If the content inside C are too big, I'd like C to scroll but to keep A and B in the same place.
Code in: http://jsfiddle.net/V2c9G/
I'm not able to do it.
I tried:
<div class="container">
<div class="a"></div>
<div class="b"></div>
<div class="xxx" style="overflow-y:scroll">
<div class="c"></div>
</div>
</div>​
without success. The container div it's supposed to resize along the browser.
A complex example would be http://www.sencha.com/examples/#overview (I'm talking about the layout, make the browser smaller and you will see scrolls apperaring hile the headers keeps fixed) but it's not a solution since it uses JS to recalculate the heights.
Any idea?

Edit 3:
This is my recommended solution, which uses CSS from the Edit 2 below as a fallback, but uses JavaScript to resize your divs appropriately onload and when your window size changes. The CSS solution provides a decent starting point if the client has JavaScript disabled, and the JavaScript is such that it really shouldn't affect the performance of the page, so I see no reason not to use JavaScript to perfect what you want to see. A working fiddle can be seen here. Also, here is the appropriate JavaScript code:
var resizeDiv = function(){
document.getElementById('c').style.height = getWindowHeight() - 64 + 'px';
};
//Framework code
var getWindowHeight = function(){
if (window.innerHeight) {
return window.innerHeight;
}
if (document.body && document.body.offsetHeight) {
return document.body.offsetHeight;
}
if (document.compatMode=='CSS1Compat' &&
document.documentElement &&
document.documentElement.offsetHeight ) {
return document.documentElement.offsetHeight;
}
return 740;//provide a default height as a fallback
};
//resize on pageload
window.onresize = resizeDiv;
setTimeout(resizeDiv);
I think you need to adjust the absolute height on your third div to take up the rest of the space (either absolutely or with percentages), set overflow to hidden on the parent div, and let the content in the third inner div determine whether to show the scrollbar or not. Here's an updated fiddle using the absolute height method.
Edit:
From your "Imagine the container is the browser" comment (which to me means the scrollbar should be on the container), all you'd really have to do is set the overflow to 'scroll' and height in the third div to 'auto'. Here's an updated fiddle for that.
Edit #2:
According to your comment on this question, it sounds like you need to go with the percentage method. The most straightforward would be to make the height of a, b, and c a percentage (I had to tweak the margins to get it to fit for all zooms). Unfortunately with this method, the top components will not be fixed, and it sounds like you may be displaying static content there that would look funky. Thus, another option is to pick a minimum supported size for your browser window and adjust the percentage of the third element so that it just fits. Here's a fiddle for that. However, the downside there is that you'll have more empty space at the bottom of the page the bigger the height of the window, and you'll have 2 scrollbars below a certain height. To really do this properly with the fixed sized divs at the top, you'll need to add an event listener to the window.resize method and resize your third div when that happens appropriately based on the new size of the window.
Note: It is times like this where I wish the W3C would approve percentages plus pixels for their height, width, and other sizing properties!

I think you might be searching for something like this: http://jsfiddle.net/QsLFt/.
However, I'm not sure how to get rid of the divs hiding the scrollbar, the easiest solution would probably be to set it a fixed width?

You need to apply overflow-y:scroll in .container
See this,
http://jsfiddle.net/v4ZtN/
Edit (after comments):
Css:
.container{
background-color: red;
width: 90%;
margin: 0 auto;
height:220px;
}
.a{
background-color: yellow;
height: 30px;
margin: 2px;
}
.b{
background-color: blue;
height: 30px;
margin: 2px;
}
.c{
background-color: green;
overflow-y: scroll;
height:inherit;
}
Html:
<div class="container">
<div class="a"></div>
<div class="b"></div>
<div class="c"><img src="http://www.boingboing.net/images/_documents_anemone_images_anemone850-1.jpg" alt=""/></div>
</div>
Edit:2 (after comments)
Change .c style with this.
.c{
background-color: green;
overflow-y: scroll;
height:100%;
}
Check this fiddle:
http://jsfiddle.net/XM4gH/6/

div only show scroll when you put some data in it, here is the result;
jsfiddle

Based on what's currently up on your jsFiddle, I think you can simply add this to the style declarations for your .container class:
overflow:hidden;
You'll have to actually add content to the .c div to see any scrolling however.

did this anser is match to your request ? enter link description here
.container{
background-color: red;
width: 90%;
margin: 0 auto;
height: 315px;
}
.a{
background-color: yellow;
height: 30px;
margin: 2px;
width: 90%;
}
.b{
background-color: blue;
height: 30px;
margin: 2px;
width: 90%;
}
.c{
background-color: green;
height: 250px;
margin: 2px;
width: 90%;
overflow-y: scroll;
}
​

It's hard to tell exactly what you are trying to do based on the question, but if this is the desired result, these are the problems I discovered in your code:
You needed to hide overflow on the red box, so the green box does not extend beyond the container
In the green box, if there is enough data to extend, you want a scroll bar. This was working, but the height you had set specifically (250px) was enough to extend out of the container. You want a specific height here, the number is whatever is remaining in the container. I got 132px. Then with the overflow scroll applied, anything that extends beyond this height will be scrollable.

CSS make images the same height as the containing element

This is the markup
img.shadow | div#content |div.shadow
I need to find a way to reliably keep the shadow images the same height as the content area. Problem is the content area can resize (like tabs that have different height, or parts of it that only appear in certain conditions). I was able to set the height of the shadow using javascript on page load, but then as soon as the height of the #content changes... not sure this makes sense, but...
Maybe this explains the problem better
http://jsfiddle.net/uLUnf/28/
The question is
how can I make the images (the grey boxes) resize along with the content (light grey box)?

http://jsfiddle.net/uLUnf/29/
You did it urself? :P

You could put the resize call inside the function that adds the content as well, like this:
jQuery('document').ready(function($){
$('#click_me').click(function(){
var id = $(this).attr('href');
$(id).show();
$('.shadow').height($('#content').outerHeight());
});
$('.shadow').height($('#content').outerHeight());
})()
Or it seems like you could get rid of the shadow images and the call to resize it entirely, and just add a border to the content in the CSS:
#content{
float: left;
display: block;
background: #eee;
width: 200px;
border-right: 7px solid #666;
border-left: 7px solid #666;
}