Make the background of the navigation bar to change when scrolling [closed] - javascript

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I have a navigation bar on a website that i am making. I want to change the colour of the bar after the page scrolls about 500 pixels. How would i code that using javascript?


You can do this by adding a scroll-eventlistener (using jQuery) which checks if the scrollposition is reached and then do some action.
window.addEventListener('scroll', function(e) {
if(window.scrollY>500)
{
//change color
}
})

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how does youtube and other sites like fb make this preloader which shows outlines and grey boxes on the areas where the posts will appear after page fully loads. This link takes you to the screenshot for reference

Take a look at
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and here

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Is it possible to have a stay on the page regardless of where the users goes to within the website?
Example: https://youtu.be/T3f-MPPH4Co

content can be done by positioning within a specific item.
https://en.m.wikipedia.org/wiki/Single-page_application

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how to partition an image in a website ? like this web site (each image is able to change her colors) : http://www.zolpan-intensement-couleurs.fr/fr/simulateur/decorateur_virtuel/index.aspx , what is the language that can we use ?

This isn't an image, it's a flash animation. Color-changing and other animations are also possible with pure CSS or with Javascript.

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I suppose there are 5 circles in my div or canvas. I hope they are moving randomly on the screen. When they hit each other or the borders they are bounced away. How to achieve this effect? Are there any sample code or snippet? Cheers!

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Is there any way I can make with a jQuery plugin or some javascript a hidden responsive bootstrap section that appear with an animation, like this one:
http://kjarninn.is/ (click BLAÐAHILLA in the navbar)

$(function() {
$('#slidePanel').hide();
$('#panelShow').click(function() {
$('#slidePanel').slideDown();
});
$('#panelHide').click(function() {
$('#slidePanel').slideUp();
});
});
http://jsfiddle.net/isherwood/pRNe8/
Notice that jQuery is loaded in this fiddle, and that I've used some absolute positioning to prevent the panel from pushing the page content down.

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