Develop Reference

HTML/CSS/Javascript/Center

have the following;
I'm displaying a 5000x5000 px image.
(it is a floor plan)
You can scroll over the image using the horizontal and vertical scroll bars
and the mouse pressed wheel.
at various points I have light points, if you press the button a popup will appear, letting you turn on or of the light or even dim.
to give you guys an idea.
Oke now I want this popup to be centered in the middle of the screen, NOT to the center of the image. Because if the view is top left, the popup would not be visible. visa versa with the lower right.
As the code is generated by an design studio I do not have many options.
An answer would be nice.
regards,
Ger

The following will center a .popup div on the page, regardless of where you scroll or what parents the popup has.
.popup {
position: fixed;
top: calc(50vh - (**INPUT POPUP HEIGHT**/2);
left: calc(50vw - (**INPUT POPUP WIDTH**/2);
}
In case you don't know the exact height or width, there's a less clean version involving setting the popup margin to auto and it's parent to display: flex. Look at flexbox if you're having trouble with this.

Animate div from middle of div to bottom right of screen into a fixed position

What I am trying to figure out is how to animate a div that will start out in the middle of a div that is in the middle of a page. The div originally should not have a position: absolute. Unless it is not possible, I would like it not to start with that because it seems very tough to have any data below it. It's not going to be that big of a box. I am guessing anywhere between the height of 100px and 600px, with a width between 400px and 800px.
I originally found this JsFiddle Example that does a great job and almost exactly what I need. But the div starts with an absolute position and it is already located at the bottom right of the page to be animated.
Once the div is at the bottom right of the page, it needs to be fixed there so that I can scroll up and down the page without it moving. At this point I am not worried about being able to push it back up to the spot in which it came.
A couple things I tried: Lining it up in the position I desired, and then on the click of a button, add a class with the attribute position: absolute and calling the animate function like this:
chatWindow.stop().animate({
bottom: 0
, right: 0
}, 2000);
But my guess is that it originally needs to the the position set as in top: 0; left: 0 and that's why it won't work.
I already have it working without any animation and would love to be able to figure out how to animate this thing. Without animation, it's as simple as toggling a class with it's normal positions attributes with one that has a position: fixed; bottom: 0; right: 0.
Here is a Codepen Example that I created to show really what I need other than right animation part not being there. Any help would be awesome as I've been toying with this for quite some time now.

If you want an animation from left to right, you will have to play with left and top values. But the negative point is that will cause a weird animation because you want to keep a relative position of the box in the beginning.
So when you will do the animation, it will start from the very top left on the window, which is not good.
Like this
To avoid that, you will have to use absolute position in the beginning state. You said in your question you doesn't want it but I think it is required to get the wanted visual effect.
See here the live example with good effect
However, to keep a pretty nice animation, but I know it is not what you want, you can play with right and bottom values. It will make the box appears from the right and bottom corners of the window.
Like this

One possibility, still using absolute positioning, based on what's going on in your codepen example, would be to fake the current positioning by adding the following CSS:
.container {
padding-top: 250px;
}
.center-window {
position: absolute;
right: 50%;
margin-right: -200px; /* i.e. half of its width */
bottom: 100%;
margin-bottom: -250px; /* i.e. its height */
}
Then you could animate the right, bottom, and margin properties accordingly. See https://codepen.io/anon/pen/RaOJYY (though it doesn't currently do anything with the padding). Of course, if your not sure of the dimensions of .center-window, perhaps this solution won't quite work.

Slider from the left side of screen to the right side of content

This is my first post so hello! :)
I have a problem with coding my site!
May I show it on this picture:
I want to make a slider (with captions for each slide) which is aligned to the right edge of content div.wrap. But left side of it must by to the left side of the screen. It must change to the screen resolution (always to the right edge of the content div.wrap Something like this
Right edge of div.wrap must be a limit.
I have no idea how to do this. The slider must be a background fader? Or img fader?
Please help me or show me how to do this on similar example.

Further to #Itay's answer, here is a jsfiddle which might help you with the CSS for this.
http://jsfiddle.net/mmWq6/4/
I've used the example of a slider that is 500px by 200px. This is what I guessed would be a miniature version of the webpage I expect you're creating, if you scale the 'Result' window narrower and then wider again you'll see that I think the design works how you want it to.
This demo basically demonstrates Itay's comments, which were to have a wrapper (#slider-wrapper) which had the CSS position: relative and a div within that with the CSS:
#slider-wrapper-inner {
position: absolute;
right: 0;
}
Then within that are .slides which are relatively positioned and .captions within them that are positioned absolutely, as above (but with an extra line: bottom: 0;), so that they sit in the bottom right.

Slide Background with AnythingSlider

I need to slide a background when clicking the "next" arrow, and the "previous" arrow - right now the background is in the #container element - However, that doesnt work - I've tried putting the background on the ul#slider element - But that doesnt work either...
What i need is that the background will be slider as much as the liinside the slider...
Any suggestions on how to do that ?
You can see the project here: http://www.i-creative.dk/Slider/
thx

I've built something like what you're asking for, and it's a total pain.
The problem is, you're talking about having a different background image, the size of the page, for EVERY slide.
2 options are:
1: Have one BIG background image, with all the background aligned horizontally, and animate the css background-position when you change a div, to keep things matching. This ahs the advanatage that only one image needs to be downloaded, but it will be big.
Problems are: you see all the other images if you jump multiple steps at once;
it requires that you use a fixed width;
it's a pain if you want to change the background for just one slide;
Preload the background for the next slide on a div which is a sibling of container but has a higher z-index. Use jquery to slide this over the existing background, from the appropriate side.
The good thing about this method is that you can use css to make the background image always take up the full-width of the screen, or use a bigger imager and have it centred. See here: http://cksk.com for an example.
Long story short, you won't get this working with an off-the-shelf solution, you'll need to get your hands dirty.
Also, you'll need to spend a hell of a lot of time on optimisation.

Try this css...
#slider {
width: 472px; /* divided the width of the background image by 4 (# of panels) */
height: 570px;
list-style: none;
/* start background after the initial cloned panel: 472px to match panel width */
background: transparent url(../images/background.png) 472px 0 repeat-x;
}
/* This makes sure the last cloned panel background matches the first panel */
ul#slider li.clone {
background: transparent url(../images/background.png) 0 0 repeat-x !important;
}
/* Make the background visible */
div.anythingSlider .anythingWindow {
overflow: visible !important;
}
The only problem is that the width of the UL is limited, so when you get to the last panel, the background ends, but reappears once you hit the right arrow.

Dynamic Background Scrolling

Here's a link to what I'll be referring to.
I'm having some trouble getting the background image to work the way I'd like it to.
I want the background to auto resize based on the width of the window, which it is already doing correctly. If you make your window smaller you'll see the background shrink with it.
Here's the issue. If you make your window wide (short) then the background will resize and go too high so you can't see the top of the background anymore (since the background is bottom positioned).
I want the background to be top position when you are at the top of the page, and as you scroll down it will slowly move to be bottom positioned. Sort of like the effect of an Android phone's background when you move left and right. Of course, keep in mind that I still want the background to auto-resize when you make the window smaller.
html {
background-color: #70d4e3;
height: 100%;
}
body {
height: 100%;
}
.background {
margin-top: 45px;
width: 100%;
position: fixed;
bottom: 0;
left: 0;
z-index: -9999;
}
.banner {
margin: 0px auto;
width: 991px;
margin-bottom: -9px;
}
.content {
background: url("http://i.imgur.com/daRJl.png") no-repeat scroll center center transparent;
height: 889px;
margin: 0 auto;
width: 869px;
}
.innerContent {
padding: 30px;
}
<img src="http://i.imgur.com/6d5Cm.jpg" alt="" class="background" />
<div class="banner">
<img src="http://i.imgur.com/JptsZ.jpg" alt="" />
</div>
<div class="content">
<div class="innerContent">
testing
</div>
</div>
Maybe some javascript or jquery would be needed to achieve this.

Well, this was fun, thanks!
I hope you don't mind me taking the liberty to use percentages to make my life a little bit easier and possibly the script slightly more robust since I can reliably use floats with percentages.
What I did is make the layout, html and css comply with the rules you need for the bg to be animated properly, they stayed largely the same from what you had.
Then it was just a question of figuring out the calculations needed with the right properties to figure out the percentage you were from the top, the *20 is actually the amount of space 'left' to fill by the background image in percentages (as the background height is 80%).
They I moved the calculations to a function so I could call that on scroll and on window resize, making sure it's initiated on any event that modifies the window somehow...
Didn't do extensive testing but it worked in Chrome and I'm tired :p
I believe this is what you are looking for:
http://jsfiddle.net/sg3s/RSqrw/15/ See edit 2
If you wanted this the other way arround just make the page background start at the top and modify that:
http://jsfiddle.net/sg3s/RSqrw/14/ See edit 2
Edit:
As a bonus, and since I had never actually written jquery script as a 'plugin', I decided to convert this into one. What I came up with should be easy to implement and use!
http://jsfiddle.net/sg3s/RSqrw/52/ See Edit 3
Functionality successfully tested in Chrome, Firefox 3.6, IE9 + compatibility mode
Edit 2:
Reading the question again checking if I did it right I noticed I didn't quite do what you want, so I updated the link in the first edit which gives you a plugin in which you can have several options for the scrolling background. It retains my 'old' interpetation while also doing what you want... Read comments in code for some extra descriptions.
Edit 3:
As I went to work today I was bothered with the fact that my plugin 'try' was a little bloated. And as you mentioned in the comment it didn't quite fit the requirements.
So I rewrote it to only do what you want and not much more, tested in Chrome Firefox, IE9 +compat etc etc.. This script is a lot cleaner.
http://jsfiddle.net/sg3s/vZxHW/
You can chose to make the background stick to the top or bottom if the height fits in the window. Nothing else, but that is already more than enough to do some pretty cool stuff :p

An exact solution: Fiddle: http://jsfiddle.net/srGHE/2/show/
View source
Thanks for the challenge. See below for the solution, which is complying with all requirements, including recommended yet optional (with steps on how to remove these) features. I only show the changed parts of your page, with an explanation after each section (CSS, HTML and JavaScript):
CSS (changes):
html,body{
margin: 0;
height: 100%;
padding: 0;
}
body{
background-color: #70d4e3;
}
#background { /*Previously: .background*/
/*Removed: margin-top: 45px;
No other changes*/
}
#banner /*Previously: .banner; no other changes */
#content /*Previously: .content; no other changes */
#innerContent /*Previously: .innerContent; no other changes */
Explanation of CSS revisions:
margin-top:45px at the background is unnecessary, since you're absolutely positioning the element.
All of the elements which are unlikely to appear more than once should be selected via the id (#) selector. This selector is more specific than the class selector.
HTML (changes):
All of the class attributes have been replaced by id. No other changes have been made. Don't forget to include the JQuery framework, because I've implemented your wishes using JQuery.
JavaScript (new):
Note: I have added a feature which you didn't request, but seems logical. The code will automatically reserve sufficient margin at the left side of the window in order to always display the background. Remove anything between the marked comments if you don't want this feature.
$(document).ready(function(){
//"Static" variables
var background = $("#background");
var marginTop = parseFloat(background.css("margin-top")) || 0;
var bannerWidth = $("#banner").width(); /*Part of auto left-margin */
var extraContWidth = (bannerWidth - $("#content").width())/2; /*Same as above*/
function fixBG(){
var bodyWidth = $("body").width();
var body_bg_width_ratio = bodyWidth/1920;
var bgHeight = body_bg_width_ratio * 926; //Calcs the visible height of BG
var height = $(document).height();
var docHeight = $(window).height();
var difHeight = bgHeight - docHeight;
var scrollDif = $(document).scrollTop() / (height - docHeight) || 0;
/*Start of automatic left-margin*/
var arrowWidth = body_bg_width_ratio * 115; //Arrow width
if(bodyWidth - bannerWidth > arrowWidth*2){
$("body > div").css("margin-left", "auto");
} else {
$("body > #banner").css("margin-left", arrowWidth+"px");
$("body > #content").css("margin-left", (arrowWidth+extraContWidth)+"px");
}
/*End of automatic left-margin*/
if(difHeight > 0){
background.css({top:(-scrollDif*difHeight-marginTop)+"px", bottom:""});
} else {
background.css({top:"", bottom:"0"});
}
}
$(window).resize(fixBG);
$(window).scroll(fixBG);
fixBG();
});
Explanation of the JavaScript code
The size of the background is determined by calculating the ratio of the background and document width. The width property is used, because it's the most reliable method for the calculation.
Then, the height of the viewport, document body and background is calculated. If applicable, the scrolling offset is also calculated, to prepare the movement of the background, if necessary.
Optionally, the code determines whether it's necessary to adjust the left margin (to keep the background visible at a narrow window).
Finally, if the background arrow has a greater height than the document's body, the background is moved accordingly, taking the scrolling position into account. The arrow starts at the top of the document, and will move up as the user scrolls (so that the bottom side of the arrow will be the bottom of the page when the user has fully scrolled down). If it's unnecessary to move the background, because it already suits well, the background will be positioned at the bottom of the page.
When the page has finished loading, this functionality is added to the Resize and scroll events, so that the background is always at the right location.
If you've got any other questions, feel free to ask them.

well, I'm not sure if I understand you and why do you want to do that, but you can try adding 2 backgrounds (see http://www.css3.info/preview/multiple-backgrounds/ ), one with the top bg and another with the bottom bg but I think that if the page is not too long it will cause issues, so the other answer with pure CSS is as follows: first add 3 horizontal divs with 100% width. Top div will have your top bg and its height, middle div will be transparent and auto height and bottom div will have your bottom bg and its height. All divs will have a 0 z-index. Then create a higher z-index div to act as a container and you'll be set. If I understand your question right, that's the close I can think of to achieve that. This being said, I'm pretty sure you can do this with JQuery with way better results

Using jQuery I was able to give you what I think you're asking for:
$(window).scroll(function() {
var h = Math.max($(document).height(), $(window).height());
var bottom = h - $(".background").height() - $(window).height();
$(".background").css("top", (($(window).scrollTop() / h) * bottom) + "px");
});
EDIT: Forgot to account for the way scrollTop reports position.

Or maybe:
.background {
margin-top: 45px;
max-width: 100%;
position: fixed;
bottom: 0;
left: 0;
z-index: -9999;
max-height: 100%;
}

I reccomend using jQuery Background Parallax
http://www.stevefenton.co.uk/Content/Jquery-Background-Parallax/
The function is as simple as
$("body").backgroundparallax();
Ask if you don't get it to work.

#abney; as i understand your question may that's you want http://jsfiddle.net/sandeep/RSqrw/60/
you need only css for this:
#background {
position: fixed;
width: 100%;
height:100%;
top: 0;
left:0;
z-index: -1;
}

The solution to your issue is a nice little lightweight plugin by Scott Robin. You can get more info, download it, and make your life easier for all of your projects by visiting his project page here.