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How to move elements on scroll-down with scrolling down the page?

Please look at this website. as you see in some sections, when you scroll down the page, the actual page is not going down, only the elements and images start moving for taking some effect. I did my best to implement such thing but I failed how do I can implement such thing (specially taking the effect)?

A very nice site, and a very good example of Parallax Scrolling.
Achieving a site just like that is going to take a long time, but you can start by looking at some parallax sites here, to get an idea of the source code and look through some demo's.

How can I scroll multiple DIVs in a slide-bar using jQuery?

I am a beginner at jQuery and I have been trying to place more than one div in one slide bar. Basically, I am working on auction site and I want a DIV which displays more than one item in same div with “Next” and “Previous” button arrows.
For example:
When you visit an auction site, one slide-bar should appear containing more than one item (multiple DIVs). The slide-bar should have a text that appears, saying “newly arrived item or recommended for you etc.”
Here's a screenshot of what I mean:
Is there any way to achieve this using jQuery? I have just recently started working with jQuery and I am stuck. Any help is much appreciated.

Assuming that “building your own” isn't an option for you, you could take a look at jQuery plugins like Smooth DIV Scroll, or any alike plugin that scrolls content horizontally left or right.
Generally, one of the nice places to find a multitude of jQuery plugins would be (for example) the jquery-plugins.net website. There you'll find usable plugins for what you're trying to do. Just one of many available there that also does what you're looking for: Any List Scroller – jQuery Plugin To Scroll Lists.
As said, there's more than a dozen alike plugins scattered all over the internet. All you need to do is to deciding which one fits your individual site best. In case of doubt, fire up your favorite search engine and look for “jquery div scroller”.

Automatic scrolling text right to left in a div

Hey I want to make text scroll from right to left in a div i have. I want this to happen automatically and at a constant flow.
Now when i first started with HTML the tag was used to do this, I've looked around a few websites and it seems that this tag still seems to be going. My question is really if this is the best way of achieving this affect or is there a better way of doing it? for example, javascript,Jquery and/or css Maybe even something in HTML5?
This shows what i am looking - http://www.gftuk.com/
Notice the scrolling stops when the user hovers over the text.
Thanks for the time.

<marquee>hello world</marquee>

Personally, I think the best way to achieve this would be to use jquery. There are a few plugins out there which do the job nicely.

If you want to automatic with "scroll" text ( structure of DOM is not complex) .
<marquee>This text will scroll from right to left</marquee>
But you will see with "marquee" the scroll is not smooth.
So you can use simplyScroll plugin
http://logicbox.net/jquery/simplyscroll/
( I see it in this code of your link : http://www.gftuk.com/. in next time, please open dev tools or firebugs and see source code of any pages when you want to have the same effects )
Hope it helps you

How to achieve custom jQuery page scroll api as in this example?

I recently came across one of Google's projects "What do you love" and saw a nice feature there.
If you visit http://www.wdyl.com/#monkeys
On your left you will see a small box that allows you to scroll the page "Quiet Cool" I thought when I saw it ))) I looked over the internet to find jQuery plugins or Tutorials on how to do similar thing (jQuery/javascript is not my strong side), but I couldn't find any.
So could anyone please explain how to make similar "Api/Feature" and provide code snippets if possible, that would really help. Ohh an jQuery solution is preferable.

As is so frequently the case, your best bet is to open your browser's Developer Tools and look at what's actually going on there! In this case, it looks like a static background (the grey boxes) with a blue frame on top of it, somehow made draggable, that calls one of the window scrolling functions after doing a bit of proportions arithmetic to determine how far to scroll.

Here is a simple demo I put together to show you how to animate the scroll of a page: http://jsfiddle.net/jasper/3cnKn/1/
In my example, the basic idea is to bind to a click event for some links and animate the scrollTop of the html element:
$('#nav').find('a').on('click', function (event) {
event.preventDefault();
$('html').animate({scrollTop : $(this).attr('data-scrollTop')}, 500);
});

horizontal scroll - like github

Is there a javascript library which lets me do the horizontal scrolls effect kind like github does when you click on a file/folder.
Preferrably jQuery plugin.
thanks

Looking at the source for github, it seems they use jQuery.animate to slide the content to the left.
$("#id").animate({
marginLeft: "-1200px"
});
Example on jsfiddle

For a more in-depth answer, GitHub actually wrote about how they've assembled their directory structure on their blog.
But yes they're using jQuery for the actual effects themselves. They mention using slideTo() in that post, but in the end it's really just an $.animate() effect.

maybe you want to look into jQuery.ScrollTo, a jQuery plugin really usefull for this kind of effects.
You could have like github a div with a overflow:hidden containing your slides or pages and above the same kind of links than in the jQuery.ScrollTo example page.