Can the content remain centered while the screen size changes? - javascript

First, here's is my rough example: http://demindu.com/sandbox/simple.html
What I'm trying to do:
Create a content div: let's say 400px tall and 700px wide, like the example. The content box has a margin of 50px in each direction. The content div should always be centered both vertically and horizontally, regardless of screen resolution. The black background should extend from the centered content area all the way to the right side of the screen, but not to the left.
The only way I can think of possibly doing this is something using window.innerWidth & window.innerHeight in JavaScript, but I don't know enough to know if this is even possible.
The amount of blank space above and below the middle section would need to be:
window.innerHeight - height of the div (in this example: 500px [400px box with two 50px margins]) / 2
The blank space to the left of the black bar would need to be:
window.innerWidth - width of the div (in this example: 800px [700px box with two 50px margins]) / 2
My question to you is: Is this possible in JavaScript? Is this possible somehow with pure CSS?

You can do this entirely in CSS with 4-point absolute positioning. You will need two elements:
The first item spans from the right of the screen to the center where the content is positioned. This element uses absolute positioning for the top, left, and right coordinates of the element (we can leave bottom unspecified as it's taken care of by the height.)
The second item is nested in the former. This item has a fixed width to ensure the content itself remains in the specified width you've chosen. We can also set the height and padding on this object and the parent will inherit it's height. Don't use margins to simulate padding - it can cause cross browser issues when you're just trying to do some positioning tricks as we are here.
So your HTML code would look something like this:
<div id="my_centered_design">
<div id="my_centered_design_content">
<p>This is just some example text.</p>
</div>
</div>
And you're CSS would look like this:
div#my_centered_design {
background: #000;
margin-left: -400px;
margin-top: -250px;
left: 50%;
position: absolute;
right: 0;
top: 50%;
}
div#my_centered_design_content {
background: #333;
height: 400px;
/* I think you actually want padding for
the effect you're trying to accomplish */
padding: 50px;
width: 700px;
}
Essentially this is the same trick as the Joe2Tutorial except we are applying additional positioning rules to adhere the centered element to the right side of the screen.

I think this pure css solution would suit you best: http://www.joe2torials.com/view_tutorial.php?view=37

A very quick google resulted in this piece of code.
this code does not align a div in the middle. what you actually for your own website is that you put the following div css
.main {
width: 140px;background-color: #252525; float: left;margin-top: 25px; }
inside a table that is aligned to be centered. so, basically you're using the table's centering feature to center your left floated div simply as a content. you're not doing anything through div or css for that matter. the piece of css code you offered doesn't not anything about centering a div in the middle.

Related

How to center align a Card with left aligned text?

Newbie question here.
I'm trying to have a card with a width that doesn't span the entire window. I have a cardStyle I've defined below.
cardStyle:{
width: '95vw'
align? : 'center?'
textAlign? : 'default or left or something'
}
I want my card to be centered but the text to have the usual left alignment. I can't seem to figure this out. If I drop it in a div, I get everything centered.
Thanks for your help!
There are many ways to do this, but the simplest is to have your "card" be a block level element (an element that renders on its own line). It's width needs to be less than 100% and its left and right margins should be set to auto. The auto applied to both the left and right margins tells the browser to split whatever space is left over equally between the two, thus the element gets "pushed" to the center of the viewport.
The alignment of the contents of the block element is separate from the position of the element itself. left is the default text-align value and it is an inherited value.
.card {
width: 50vw;
margin:auto;
border:1px solid black;
background:#e0e0e0;
}
<div class="card">I am the card</div>

Is it possible to have an auto-height div footer with scrollable content area above?

I am trying to create a container that has two sections - the top section will be a scrolling div that takes up 100% of the vertical height of it's container, minus the height of a sticky footer. The sticky footer cannot have a hardcoded height (because it will work in two modes with two different heights) which is where I'm troubled. I would prefer not to use js, only css if possible.
HTML
<div class="container">
<div class="scrollArea">
a<br/>b<br/>c<br/>d<br/>
a<br/>b<br/>c<br/>d<br/>
a<br/>b<br/>c<br/>d<br/>
a<br/>b<br/>c<br/>d<br/>
</div>
<div class="footer">
<!-- the contents of the footer will determine the height needed -->
</div>
</div>
CSS
.container {
position: relative;
height: 100%;
width: 100%;
}
.scrollArea {
position: absolute;
top: 0px;
bottom [height of sticky footer]; left: 0px;
right: 0px;
overflow-x: hidden;
overflow-y: scroll;
}
.footer {
position: absolute;
bottom: 0px;
height: [height of sticky footer];
left: 0px;
right: 0px;
}
You don't want to be using position: absolute; on everything.. This will make it very difficult to style things because a absolute element technically has no height (from the perspective of other elements). You are further confusing things by using the "stretch technique" of using bottom, left, top and right all 0.
Your question is also a bit confusing in terms of how the height will be set.. Is it to be set through javascript? Through media queries? If it is either of those cases, you could easily set the height of the scroll area through the same method, allowing them to change in tandem.
If, for some reason you have to only set the height for this one element, you can let css table display properties do the work of calculating the new height for the scroll area, by setting the container as display: table;, and adding another wrapper around the scrollarea. Setting that wrapper and the footer to display: table-row; will get them laid out.
Check this out to see what I mean:
http://jsfiddle.net/6gprU/3/
Your code sample suggests that the height will be set, somehow.. though if this is not the case, and you absolutely cannot set the height (which would be the case if the content that went into the footer was dynamic and unpredictable in size) then you are making this increasingly difficult. In this case, it would depend on if the overall container height needs to stay a certain size. If it does, like I assume it would, then you may need to rethink your layout, as you have too many variables to be able to do it with pure css.
As a final addition to that, there is another option that would make this really easy. CSS has a feature called calc():
https://developer.mozilla.org/en-US/docs/Web/CSS/calc
This feature allows you to perform calculations in css, much like you would in javascript, and would allow you to set the height of anything in relation to anything, dynamically. However, I put this last, as browser support is a bit limited. It will not work in IE 8 or below.
Check this site to see where it will work, and then make the decision as to wether this is a valid option for you or not.
http://caniuse.com/calc

Scroll a page with 100% height fixed div which always on top and shouldn't cover the footer

http://jsfiddle.net/9fCfE/1/
.fixed {
width: inherit;
height: 95%;
overflow-x: hidden;
overflow-y: auto;
position: fixed;
}
footer {
width: 100%;
}
Fixed div must be always on top and shouldn't cover the footer when I scroll.
100% height or from top to footer.
How can I do it?
The simplest answer is to drop the z-index of the fixed region so that when it would otherwise cover the footer, it instead moves behind it. You'll need to make sure the footer is position: relative;.
Fiddle example
If, instead, you want the two to never intersect, you're in for a harder challenge.
The best way to do it would to be giving your fixed element a fixed height, giving your footer a fixed height, and making sure that the fixed element height + the footer height <= the screen height.
Fiddle example
Those are really your only options - you essentially have to design around it. To the best of my knowledge, there is no way to dynamically shrink the fixed element when it intersects with other elements on the page (ignoring the rest of the elements on the page is the purpose of position: fixed, after all).
I've cobbled together a quick and dirty implementation of what you asked using jQuery, offset(), scrollTop() and height()
Here's the jsfiddle example.
Is this what you wanted? If so - why? :)
I don't see any visual difference between this method, and the one where the fixed element goes under the footer.

Bottom div with horizontally sliding content

I need an div that will be always at the bottom of the page, margin 172px at the left, and 383px at the right.
This div will have some images and text and left and right buttons. When you hover the mouse at the right button, for example, the content that was "invisible", after reaching the div's width limit, will start appearing from the right, sliding the content for the left.
I tried using position:fixed; bottom:0px, but I couldn't margin the div, and the width of it doesn't change when the screen size changes...
For example, this would be exactly what I want (the black div at the bottom):
If you know any jquery plugin that does what I want or if you know how to do something like this, please help me!
If you're using position: fixed, margin can not be applied. You can specify the left and right attributes though.
position: fixed;
right: 383px;
bottom: 0;
left: 172px;
I know it's not exactly what you're asking for, but you can then set the white-space and overflow attributes on that div to make it so that it will show a horizontal scrollbar.
white-space: nowrap;
overflow: auto;
The user would use the scrollbar on the bottom to move the content of the div. Here's an example: http://jsfiddle.net/rustyjeans/5nv84/
To use jQuery set overflow: hidden and add some functions that adjust the scrollLeft of the div, then add some controls that call those functions when they're hovered. Here's an example: http://jsfiddle.net/rustyjeans/FtSGn/
This shouldn't be too hard to do. You want a containing div that has the dimensions of the viewer. Then, have a div inside that one, with position absolute and dimensions that extend beyond the viewer in width. When the arrows are hovered over use jquery to change the "left" css property of the inner div. Did that help?
EDIT:
The outer div should have "position: relative;" to insure that the inner div is positioned relative to its margins.

Set responsive div height to equal its sibling

I have two divs whose widths are controlled by percentages. I want the right div to be exactly as tall as the left div, which expands and shrinks based on the width of the image it contains and the width of the browser window.
Is there a way to accomplish this without javascript?
http://jsfiddle.net/5JU2t/
The simplest way to achieve this is to make the .right div absolutely positioned and setting top and bottom to 0.
Just remember to position the parent (.main) div relatively and remove all of the floats:
.right {
bottom:0;
position: absolute;
right:0;
top: 0;
}
.main {
position: relative;
}
Working example: http://jsfiddle.net/5JU2t/1/
Note
The reason the right column is a little longer in the example is due to the white space added under an image. Should you only be using an image in this column then you can add float: left to the image to resolve this:
Working example: http://jsfiddle.net/5JU2t/2/
I'd try wrapping it in a third div and give your two divs either height:auto or height: 100%.
Set the parent (.main) to display as table
and set the children (.right, .left) to display as table cell.
I would say funk all the extra css and use a table layout

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