Develop Reference

Having the same nav bar become fixed after scrolling past a certain element

I currently have a nav bar within my header that I would like to become fixed after the user scrolls past a certain element. I would also like to achieve the same animation effect as seen at http://pixelmatters.com
When I say 'same' I mean using the same nav bar/header element that I'm using at the top, rather than using a duplicate somewhere else in my document.
I've tried to achieve he result with my own code shown below. I've also included a jsFiddle link of my current setup.
jQuery
var bottomElement = $('.dividerWrap').offset().top + $('.dividerWrap').height();
$(window).on('scoll', function() {
var stop = Math.round($(window).scrollTop());
if (stop > bottomElement) {
$('.header').addClass('isFixed');
} else {
$('.header').removeClass('isFixed');
}
});
https://jsfiddle.net/npfc8wsx/1/

I answered something like that few days ago. please take a look at this code:
$(window).scroll(function () {
var scrollTop = $(window).scrollTop();
var scrollToVid = $('#test').offset().top
console.log(scrollTop); //see window scroll distance //
console.log(scrollToVid); //see scroll to div offest//
if ($(window).scrollTop() >= scrollToVid) {
alert('You reached to the video!');
}
});
jSFiddle
Main Question
now for you some code must change:
$(window).scroll(function () {
var scrollToElem = $('.dividerWrap').offset().top
if ($(window).scrollTop() >= scrollToElem) {
$('.header').addClass('isFixed');
} else {
$('.header').removeClass('isFixed');
}
});

jQuery- changing colour of nav bar at certain point

I currently have this working on each webpage, other than my 'about us' page.
Basically, I have used the variable:
<div class="spacer"></div>
<p id="startchange">
which links to the JQuery to initiate the change in colour / replacing the image with the other one. Currently neither of these attributes are changing, however on other pages they work just fine: as the sticky nav bar becomes smaller using waypoints. I am using these variables pretty early in my code (Just underneath header).
It seems no matter where I place these, they do not seem to execute, and I am not sure why.
jQuery:
<script>
$(document).ready(function(){
var scroll_start = 0;
var startchange = $('#startchange');
var offset = startchange.offset();
$(document).scroll(function() {
scroll_start = $(this).scrollTop();
if(scroll_start > offset.top) {
$('#navbar').css('background-color', '#f0f0f0');
$("#navbar img").attr("src", "images/logo-grey-real.jpg");
} else {
$('#navbar').css('background-color', '#fff');
$("#navbar img").attr("src", "images/logo.jpg");
}
});
});
</script>

I made a JSFiddle :)
HTML :
<div class="navbar"></div>
<p id="test">test</p>
Jquery :
var offset = $('#test').offset().top;
var navbar = $('.navbar');
$(document).scroll(function() {
position = $(this).scrollTop();
if (position < offset)
navbar.css('background-color', 'red');
else
navbar.css('background-color', 'blue');
});

Making nav bar effects using scroll AND click in jQuery

I want a nav to highlight (or something similar) once a user clicks on it AND when a user scrolls to the corresponding section.
However, on my computer when one clicks on any of the nav events after3, only nav event 3 changes. I'm guessing this is because after one clicks on 4 or 5, the scroll bar is already at the bottom of the page, so 4 and 5 never reach the top. The only div at the top is post 3, so my code highlights nav event 3 and ignores the click.
Is there any way I can fix this? Ive tried if statements (only highlight nav event if it's at the top AND the scrollbar isn't at the bottom or the top isn't the last item).
Here is a more accurate fiddle, using a fix below showing what I am talking about. The fix now highlights on scroll, but if you click option 5, it will not highlight.
$('.option').children('a').click(function() {
$('.option').css('background-color', '#CCCCCC;');
$(this).css('background-color', 'red');
var postId = $($(this).attr('href'));
var postLocation = postId.offset().top;
$(window).scrollTop(postLocation);
});
$(window).scroll(function() {
var scrollBar = $(this).scrollTop();
var allPosts = [];
var post = $('.content').offset();
var lastPost = allPosts.legnth-1
var windowHeight = $(window).height();
var bottomScroll = windowHeight-scrollBar;
$(".content").each(function(){
allPosts.push($(this).attr('id'));
});
i = 0;
for(i in allPosts){
var currentPost = "#"+allPosts[i];
var postPosition = $(currentPost).offset().top;
if (scrollBar >= postPosition){
$('.option').css('background-color', '#CCCCCC');
$('#nav'+allPosts[i]).css('background-color', 'red');
};
};
});

I think you've overdone your scroll() handler, to keep it simple you just needs to check if the scrollbar/scrollTop reaches the '.contents' offset top value but should not be greater than its offset().top plus its height().
$(window).scroll(function () {
var scrollBar = $(this).scrollTop();
$(".content").each(function (index) {
var elTop = $(this).offset().top;
var elHeight = $(this).height();
if (scrollBar >= elTop - 5 && scrollBar < elTop + elHeight) {
/* $(this) '.content' is the active on the vewport,
get its index to target the corresponding navigation '.option',
like this - $('.Nav li').eq(index)
*/
}
});
});
And you actually don't need to set $(window).scrollTop(postLocation); because of the default <a> tag anchoring on click, you can omit that one and it will work fine. However if you are looking to animate you need first to prevent this default behavior:
$('.option').children('a').click(function (e) {
e.preventDefault();
var postId = $($(this).attr('href'));
var postLocation = postId.offset().top;
$('html, body').animate({scrollTop:postLocation},'slow');
});
See the demo.

What you are trying to implement from scratch, although commendable, has already been done by the nice folks at Bootstrap. It is called a Scrollspy and all you need to do to implement it is include Bootstrap js and css (you also need jquery but you already have that) and make some minor changes to your html.
Scrollspy implementation steps.
And here is a demonstration. Notice only one line of js. :D
$('body').scrollspy({ target: '.navbar-example' });

Stop scrolling page, scroll div

I'm creating this landing page: http://tag4share.com/landing/#
Where is located the two galaxy s3 (one white with "Organizador" label on it and a black with "Participante" label), I want to stop scrolling the page and automatically start scrolling the content inside the mobile (an iFrame, div, anything).
Is it possible?
Basically I want to "focus" the scrolling inside a div (and make it work even if the cursor isn't hovering it). Or animate while scrolling without scrolling the body.
Example: http://www.google.com/nexus/5/
On the "Everything you need to capture the moments that matter." part.
My attempt:
var lastScroll;
var currentScroll = $(window).scrollTop();
$(window).scroll(function() {
lastScroll = currentScroll;
currentScroll = $(window).scrollTop();
if($(window).scrollTop() >= 2024 && $(window).scrollTop() < 2500)
{
var difference = currentScroll - lastScroll;
$(".main").css({"margin-top":"-="+currentScroll});
}
});
I've tried to move the main div along with scrolling. It works but it looks really strange (keeps shaking).
Thanks!

I've just tidied up your code a tad, fixed indentation etc.
As for actually scrolling your div when you hit the position, use animate to actually mimic the scrolling effect, once you know you have reached the bottom, you can put another if statement within the scroll function to stop resetting the scroll position.
var lastScroll;
var scrollPosition = $(window).scrollTop();
var reachedBottom = false;
var phonePositionTop = $('#phoneContainerID').position().top;
var phonePositionBottom = phonePositionTop + $('#phoneContainerID').height();
$(window).scroll(function() {
if(scrollPosition >= phonePositionTop && scrollPosition < phonePositionBottom && reachedBottom == false){
var difference = currentScroll - lastScroll;
// Keep resetting scroll to the phoneContainerTop position
$(".main").css({"margin-top": phonePositionTop});
var scrollLimit = -100;
if ($('#phoneContainerID').position().top < scrollLimit) {
//Once the scroll limit is less than -100 (scrolled up 100 pixels)
// Disable our 'pause' effect, and continue
reachedBottom = true;
}
}
});
I haven't tested this, however I was just giving you an idea of where to go from here.
I hope I have helped a little!

Jquery when the user hits bottom of the page

I've been working on a scroll to top function for my website, and that part of it works fine. My problem is however that I have a fixed div that is overlapping my footer when it hits the bottom of the page.
Here is the function that I have working.
$(document).scroll(function (e) {
if (document.body.scrollTop >= 800) {
$('#beamUp').show(1000);
} else {
$('#beamUp').hide(1000);
return false;
}
});
Is there somehow I could detect when I hit that part of the page and stop the div from moving past that.Help is much appreciated!
jsFiddle: http://jsfiddle.net/zazvorniki/RTDpw/

Just get the height of the page, minus the height of the div in question, as well as the footer... make sure the top is never greater than that value... you'll also need an onresize event handler re-evaluate that value.
looking at your jsfiddle... here are my edits
In your scroll listener, I am checking for the position of the page, and adjusting the bottom position of the floater appropriately. I also set the initial display:none, so you don't need to call .hide() in your initial script. In addition, resizing the window has the effect of scrolling for your use, so I changed the listener for both events.
$(document).on('scroll resize', function (e) {
var viewHeight = $(window).height();
var viewTop = $(window).scrollTop();
var footerTop = $("footer").offset().top;
var baseline = (viewHeight + viewTop) - footerTop;
var bu = $("#beamUp").css({bottom: (baseline < 0 ? 0 : baseline) + 'px'});
if (viewTop >= 50) {
bu.show(1000);
} else {
bu.hide(1000);
}
});