Fixed sidebar centered vertically - javascript

A website I am building has a fixed sidebar on the left at the center of the screen. It should always stay at the vertical center of the browser window when the page is scrolled.
How can I achieve this effect? Is there a pure css/html solution?
I thought about updating the sidebars position onscroll, but it is likely to flicker as the css top position gets updated. Is there any other solution? I would really like to do this with css only, but I wouldnt mind if jquery would provide the functionality I am looking for.

You probably need to add position: fixed; to the css to make it so that it does not move.

Here's what you are looking for. Please note that mobile browsers will ignore position:fixed so you will need to use some js to make it work for them as well. Also, make sure that the container's min-height is 200px;
#sidebar
{
height: 200px;
position: fixed; /* Keep in position on scroll */
top: 50%; /* push down 50% of container */
margin-top: -100px; /* bring back up 50% height of this element */
}
#container
{
min-height: 200px;
_height: 200px; /* IE6 always acts as though height is min-height unless overflow: hidden */
}

Related

IOS scrolling issues (elastic scroll and bounce)

I have developed a site that has a fixed footer and header.
The content is also fixed (but that is only because the footer and header can be hidden, but I won't be showing that in my example).
The issue I have is with iPhones and iPads. They are two issues I have had.
Once is it allowing me to drag the header and footer past the confines of the body/html showing whitespace (no idea why they do this) and the other issue is it stopping scrolling as soon as I let go with my finger.
The latter seems to be solvable by doing this:
overflow-x: hidden;
overflow-y: scroll;
-webkit-overflow-scrolling: touch;
Although I have read that this is not a supported CSS attribute, it does seem to do the trick.
The second issue I have tried to solve with JavaScript by making the header and footer non-scrollable, but it doesn't seem to work properly.
The JavaScript is simple enough:
function disableElasticScroll(e) {
e.preventDefault();
};
which I can put on an element like this:
ontouchmove="disableElasticScroll(event)"
This does not have the desired effect.
I have set up a codepen to highlight the issue. If you have an ipad, have a look. First drag the content inside the .content area. That works nicely (thanks the the -webkit solution). If you then try and drag the .header or .footer you will notice that you can't drag it and no scrolling is happening (again this is good and is due to the JavaScript), but if you try to then scroll the .content again, you will notice that it drags the entire page and does the elastic scroll rubbish.
https://codepen.io/r3plica/pen/LzRQaZ
There is a way to do this so that you don't have to fix the scrolling container. Try positioning your header and footer with a fixed position then padding the body of your page by the height of those elements. This way your page will scroll normally without any hacks. It might look something like this:
body {
padding-top: 60px;
padding-bottom: 40px;
}
header.global {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 60px;
}
footer.global {
position: fixed;
bottom: 0;
left: 0;
width: 100%;
height: 40px;
}
html, body {
position: fixed;
}
try setting this css property and see if it works.
It solves the elastic scrolling effect on the body.
Sample page
Output to test on ipad

Positioning div to the right with an undefined width

I'm going to have trouble explaining what I mean but bear with me. First here's my fiddle https://jsfiddle.net/jmajnqej/5/ (updated by Aziz)
#freelancewrapper {
width: 100%;
max-width: 1000px;
height: 440px;
background-color: #9D9D9D;
position: absolute;
}
I'm trying to get freelancewrapper to hug the right side of the screen with no padding. It needs to stay connected to the very right side of the screen no matter what width the window is. To make it more complicated it's parent div contentwrapper has to stay where it is with the same width and margins.
here is a representation of two screen sizes to show what I mean. http://imgur.com/a/IkOwx
Update: I didn't realize it at the time but this is a two part question. Positioning it was easy but getting the right correct width property is not. Here's my question for that Trouble defining width of a responsive div.
All you have to do is add the following CSS properties to your element:
position: absolute;
right:0;
jsFiddle fork
If you want the div to remain attached to the screen when scrolling, you can replace absolute with fixed.
Keep in mind that position: absolute works relative to the first parent tag with a position:relative. by default, that tag would be the body.
Also an important thing to keep in mind is that when an element is absolutely positioned, it will lose its space in the layout and hover over all elements.
I can't tell you the exact value you should need to achieve the desired result. What i would advice for trying to make your styling "responsive" is to start 1. from a mobile first approach(easier to up the screen size then downsizing).
To further answer your question try using relative units. your width for example is 100% this is relative. But instead of pixels try using em.
every ~16 px(not precise) is 1.0 em.
furthermore you can use position: absolute;
good luck further.
Like Paulie_D said you can use position
CSS
.contentwrapper {
width: calc(100% - 190px);
max-width: 1160px;
margin-top: 50px;
margin-left: 40px;
position: absolute;
right:0;
}
DEMO HERE
you can use negative right margin on <div class='contentwrapper'>
.contentwrapper{
margin-right: -48px;
}
https://jsfiddle.net/linkers/jmajnqej/3/

Center an Image Vertically in a Fixed Position Div

There are tons of questions on SO regarding vertical alignment, but I haven't discovered a clear answer to my problem.
I created a fiddle to show exactly what I'm trying to do.
HTML:
<div id="fade"></div>
<div id="fullscreen">
<img src="http://jira.seraphdevelopment.com/jmajewski/clean/uploads/pictures/n8jvxzd2476480d0.jpg" />
</div>
CSS:
#fade {
/* Cover the entire viewport. */
position: fixed;
top: 0px;
right: 0px;
bottom: 0px;
left: 0px;
/* Transparent Background */
background-color: #000;
opacity: 0.50;
}
#fullscreen {
/* Cover the entire viewport. */
position: fixed;
top: 0px;
right: 0px;
bottom: 0px;
left: 0px;
}
#fullscreen img {
/* Adding the display: block allowed me to center
the image horizontally with the margin: auto. */
display: block;
margin: auto;
/* Limit the size of the image. */
max-width: 80%;
max-height: 80%;
/* This didn't work for me. */
vertical-align: middle;
/* This didn't do anything, either. */
line-height: 100%;
}
I am trying to make a lightbox of sorts, such that the user will click on an image on the page, causing that same image to load up in fullscreen mode. The first div, fade, will be used to cover the entire page with a semi-transparent black background, essentially giving the effect of the page fading away, while also making things modal.
I wanted to be able to nest the image inside the fade div, but I ran into a problem. Setting the opacity on the outer div (to create the fade effect) caused my nested image to inherit the opacity value. Thus, I added a separate div that was identical to the first one, except without the background, and nested the image inside of that.
For the record, I did manage to figure out a workaround to the opacity issue, but I haven't yet implemented it. Credit to Blowski, a SO user who posted this answer to a question regarding opacity:
I do not want to inherit the child opacity from the parent in CSS
The long story short, I have tried quite a few things now in trying to get this image to be centered vertically, but to no avail.
Keep in mind, this solution needs to work with any image!
I am certainly capable of adding a line of code to the $(window).resize() function to center the image manually, but I would like to avoid doing so, if possible. I'm very curious to learn a way around this, as I seem to run into these types of issues more often that I'd like.
Bonus: Why is vertical alignment so difficult for a browser to perform?
Here is one way centering an image in a fixed/absolute positioned div using CSS.
#fullscreen {
/* Cover the entire viewport. */
position: fixed;
top: 0px;
right: 0px;
bottom: 0px;
left: 0px;
}
#fullscreen img {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
margin: auto;
/* Limit the size of the image. */
max-width: 80%;
max-height: 80%;
}
The trick is to use position: absolute for the img and set all the offsets to 0, and then margin: auto will center the image.
The max-width and max-height values will work as expected.
The reason this works is that the image has intrinsic dimensions, so the CSS engine has specific values to do the necessary math to center the images both vertically and horizontally.
See demo at: http://jsfiddle.net/audetwebdesign/KG99S/
Comments
Note that this technique works independently of the overlay.
Also, this works regardless of the aspect ratio of the image.
Reference
This technique follows from the CSS2 specification regarding how the horizontal and vertical margins are determined for absolutely positioned inline, replaced elements.
http://www.w3.org/TR/CSS2/visudet.html#abs-replaced-width
and
http://www.w3.org/TR/CSS2/visudet.html#abs-replaced-height

How do I expand selector width from center (or other efficient alternatives)?

I've got a navigational bar (#nav_bar), which has the following CSS properties:
#nav_bar {
background: url(../images/navbar.png) repeat-x;
width: 100%; height: 50px;
margin-bottom: 20px;
}
It takes the width of #wrap which is 1024px wide and has margin: auto;, however I would like to expand it so that it will fit all screen sizes 100%. I attempted to set width: 500%; just to see what it would do, then I realized that it expands from the left -> right, rather than both ways from the center.
So, what I'm asking is;
Is it possible to have an element expand from the center, then
perhaps I could set the max-width property or use javascript to
find out the visitors screen resolution then assign the width from
there; without major inefficiencies, i.e. extended load times/cross-browser compatibility issues?
Just for reference, a link to the particular page I'm talking about
Any answers will be greatly appreciated ;)!
Simply move your #nav_bar out of the #wrap.
Alternatively you can make your #nav_bar have position: absolute; left: 0px; width: 100%; in CSS, that will work too.
Why don't you use CSS3 Media Queries, to find out about screen size of your clients.
If your #nav-bar is a block-level element, like a div, a ul or a p element, then it by default would take the whole width of its container. Thus you don't need to set width: 100%; there. Also, you can use text-align: center; to center align the content.
In your case, you can use absolute positioning with overflow: visible attribute, and set the width of the menu. Also, you may simply extract your #nav-bar out of the wrap, to let it take the whole space.
use margin: auto
you can see an example here: http://jsfiddle.net/s995c/4/

How to make a DIV always float on the screen in top right corner?

How do I make a DIV always float on the screen's top right corner, so that even when I scroll the page down, the DIV still shows up in the same fixed location? Thanks.
Use position: fixed, and anchor it to the top and right sides of the page:
#fixed-div {
position: fixed;
top: 1em;
right: 1em;
}
IE6 does not support position: fixed, however. If you need this functionality in IE6, this purely-CSS solution seems to do the trick. You'll need a wrapper <div> to contain some of the styles for it to work, as seen in the stylesheet.
Use position:fixed, as previously stated, IE6 doesn't recognize position:fixed, but with some css magic you can get IE6 to behave:
html, body {
height: 100%;
overflow:auto;
}
body #fixedElement {
position:fixed !important;
position: absolute; /*ie6 */
bottom: 0;
}
The !important flag makes it so you don't have to use a conditional comment for IE. This will have #fixedElement use position:fixed in all browsers but IE, and in IE, position:absolute will take effect with bottom:0. This will simulate position:fixed for IE6

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