I'm not pretty good in java. Still I guess that question is not too easy for pros as well.
As the header says I'm trying to find a solution how to change a background image gradually by scroll with jQuery.
The background should be responsive.
I found a website having a similar thing sojournnetwork.com
Since I'm no pro with java and jquery a jsfiddle example would be nice!
Thanks in advance
I think this is a perfect tutorial for your needs.
http://ianlunn.co.uk/articles/recreate-nikebetterworld-parallax/
This is the result of the tutorial:
http://ianlunn.co.uk/plugins/jquery-parallax/
The background image dont change, just is Fixed.
div.background {
background-image:url(xxx);
background-attachment: fixed;
}
And every "new" image is a container div who scroll like another.
Something like this must work.
I believe this effect is typically called "Parallax". You might find some of the following examples helpful:
http://wagerfield.github.io/parallax/
http://stolksdorf.github.io/Parallaxjs/
You can also search google for the word "Parallax" and find some simple scripts that don't require an external library if that is a requirement. I did find this JSFiddle which might be helpful as well. I believe it uses the following to setup the backgrounds:
background: url(http://www.webdesignermagazine.nl/files/2012/06/golf.jpg) 50% 0 no-repeat fixed;
Just wondering if theirs a more efficient means of doing this?
$(window).resize(function()
{
$('.title').css('font-size',Math.floor($(window).width()*0.2)+'px');
$('.title').css('background-size',Math.floor($(window).width()*0.5)+'px');
$('.title').css('padding',($(window).width()*0.1)+'px 0px '+($(window).width()*0.1)+'px');
}); `
I'm doing this to get my web applicatiion (cordova/phonegap) to resize properly for all devices. I've tried using viewport and had mixed results especially when it came to getting text to scale relative to dpi and screen dimensions.
There are a few ways of doing this.
There are some pre-made libraries such as BootStrap for mobile view.
You can use percentage instead modifying the css through jquery.
For some help a nice tutorial site for css is w3Schools css tutorial page.
Each result has different results.
Now on your example code you are using window.width* 0.5 or window.width / 2 which is half. If you are in the root element with no width settings you could use 50% instead of pixels to easily achieve the effect you are looking for.
However it is most likely not like that. You may have to specify widths of parent elements to achieve this.
have you considered using css #media .
it is more neat , and doesnt require javascript event to be triggered.
more info can be found here
http://www.w3schools.com/css/css_mediatypes.asp
You can use #media queries to serve the purpose.
i am trying to copy the looks of this site:
http://www.vindrejse.net/
If you try to re-size the window downwards, you can see that the image size re-sizes aswell, what exactly is done to achive this?
I've written a jQuery plugin for exact this problem: https://github.com/yckart/jquery.fitpic.js
Here's an example for you: http://yckart.github.com/jquery.fitpic.js
If you just worry about modern browsers, you can do that with CSS3's
background-size: cover;
declaration.
The closest thing to an industry standard for this is the BackStretch plugin:
http://srobbin.com/jquery-plugins/backstretch/
It works on both full page backgrounds and DIV elements. Very simple configuration. Supports transitions.
I'm trying to get a background image to behave like GE's background on their website:
http://www.ge.com/stories/powering-gas-engines.html
I was wondering what CSS or javascript techniques they were using to get that kind of effect.
There is a jQuery plugin that can help you accomplish this, and he's laid out the code in his description to give a good idea of how it all works. What I like about this one is it also maintains aspect ratio.
http://bavotasan.com/2011/full-sizebackground-image-jquery-plugin/
it is an image, rather than a background image, and they use a javascript function called from the onresize event to set the width and/or height of it to the full width of its containing div.
It is possible to create a similar effect by using the css3 background-size property, but this is only supported in the css3 compliant browsers.
css width: 100% for both container and background image and use media queries to control minimum windows size to use elastic width or fix width
My designer believes this cannot be done, however it seems possible to me. (Although I have limited CSS experience). However, he also said the background couldn't be fixed, and stackoverflow has proved his wrong in the past; so I question his knowledge.
JQuery can be used if this cannot be done in pure CSS.
The top half will be a gradient that has full flexible to skew left, right, up, down without much distortion. The bottom half is an image that is ideally made for the 1280 x 1024 resolution (as this is the most popular browser display resolution). Then depending on the requirements needed it will sketch and skew to whatever size it needs. Still allowing all of the image to be seen.
The ration between the top half and bottom half is always 50% 50% independent of browser resolution.
I would also like if both the top and bottom parts are fixed.
In a perfect world (one without IE), id like to do this with css3 gradients and multiple backgrounds in 1 DIV. However, because IE9 isnt out yet, I think the best way to approach it would be 2 divs in a DIV container and using a PNG repeating background for the top div.
It should be noted I am going to use css3pie.com to allow some CSS3 for IE6-8 (but I dont want to rely on it, unless 100% proven)
Is this possible with just CSS? How would you do it?
If not possible with just CSS, is there a way I can get JavaScript/JQuery to aid?
I am thinking a base of 1280 x 1024 isn't the best idea because it seems to have an odd radio.
Edit 1
Oh yeah, I have a WIP too:
http://meyers.ipalaces.org/extra/
It looks good in 1280 x 1024...now its just getting the whole resizing of the top DIV to be 50% so the image is 50%.
I'd still like ALL of the water to be seen, because I like the look of the rocks at the bottom. However, I am open to alternative ideas that don't accomplish what I want 100%, but come close.
Edit 2
How about using the top gradient as the true CSS2 background and then just putting a <img> at the bottom of it to resize? Perhaps that will allow for CSS2 ability. I am reference some work-around techniques here: A list apart
Edit 3
I am still looking for results that work on IE6 and also don't cause Internet explorer to lag. I am setting a bounty of 50 to help attract more attention.
I have successfully came up with 2 ways to do this:
Method 1
Click here to view demo
Using CSS3 background-size I was able to set 2 div elements to on top of each other with min-height: 50% and then using background-size: 100% 50% they successfully accomplish what I am looking for.
This method was just a proof of concept, as IE6-8 does not support background-size, I didn't pursue tweaking this method perfectly. As it stands, it currently messes up when you scroll despite have background-attachment: fixed;. I ditched this CSS3 method in order to look for better methods using CSS tricks...
Method 2
Click here to view demo
Following the examples I found from A List Apart (Article | Example1 | Example2). I used Technique #2 from Example 1, and I was able to emulate what I wanted to do using just CSS2. (I am not 100% sure how or why this works, but it does)
Because I am also going to use CSS3PIE to give IE6-8 CSS3 the ability to do linear gradients, border-radius, and box-shadow; I opted to use a linear gradient instead of an image for the top background.
Problems
CSS2 Method from Technique #2, Example 1 does not work with IE6 Correctly
Creates excessive lag in all current Internet Explorers
It can be done with CSS only. No PIEs necessary. Just an IE6 bug and some filter magic.
Demo:
http://www.bundyo.org/test/FPB.html
Do this using raphaeljs. Create a background DIV that becomes a canvas, draw a rect to 50% of the page height (if using jquery then use $(window).resize() to monitor for a window resize and $(window).height() to get the 50% into pixels).
You can fill in the raphealjs rect with specifing it's fill value to something like fill: "90-#000000-#ffffff"
As for the image:
Place the image using raphealjs' image OR just embed it using HTML and update it's height-scale using jquery as mentioned above.
I've done something like this just recently using about 10 lines of code.
Also: Change your water.png, it's about 275kb, where as the next largest file on your page (the css) is like 1.5kb.
If you want to keep the horizon of the water at 50% on your screen, I would suggest a simpler method;
Create an image (probably about 1280 wide) in Photoshop of water on bottom and gradient on top. Fade the top gradient into a solid light blue(#68b for example). Fade the left, right and bottom of the image into the same solid color(#68b).
Set the background of your page as follows;
html {
background: #68b url(waterimage.png) center center no-repeat;
}
In your case, you'll probably want to apply the background to #wdth-100 instead of html, but it all depends on which element you want to put your background on.
All done. Let me know if that works for you.
I don't have a link to your top image, so i used the same image for top and bottom.
You should probably use a CSS solution for normal browsers and the JS for IE.
<script type='text/javascript'>
$(document).ready(function() {
wh=$(window).height();
ww=$(window).width();
if(wh%2) {
h1=Math.round(wh/2);
h2=Math.round(wh/2)-1;
} else {
h1=h2=wh/2;
}
img1=$("<IMG/>",{'src':'http://meyers.ipalaces.org/images/bottom-bg.jpg','id':'img1'} )
.css({'width':ww,'height':h1,'top':'0','left':'0','position':'absolute','z-index':'-100'});
img2=$("<IMG/>",{'src':'http://meyers.ipalaces.org/images/bottom-bg.jpg','id':'img2'} )
.css({'width':ww,'height':h2,'top':h1,'left':'0','position':'absolute','z-index':'-100'});
$(document.body).append(img1);
$(document.body).append(img2);
});
$(window).resize(function() {
wh=$(window).height();
ww=$(window).width();
if(wh%2) {
h1=Math.round(wh/2);
h2=Math.round(wh/2)-1;
} else {
h1=h2=wh/2;
}
$('#img1').css({'width':ww,'height':h1,'top':'0','left':'0'});
$('#img2').css({'width':ww,'height':h2,'top':h1,'left':'0'});
});
</script>
The pragmatic answer would seem to be to do it using multiple divs with their own background, all of which would be positioned absolutely and behind everything else using z-index.
I know that's not the clean markup solution with a single div with some magic CSS, but this is a tricky problem in pure CSS in any browser, and almost certainly impossible if you need to support IE6.
An even more pragmatic answer would be to say "I'll support IE6 as far as I can, but if it can't support my lovely background effect then that's just tough luck for anyone still using it".