Develop Reference

jQuery Div Scrolling Function: Issue in IE

I'm currently developing a website that that has a fixed banner div that is centered, and I'm using the jQuery below to ensure that it scrolls correctly even though it is a fixed positioned div.
jQuery:
$(window).scroll(function() {
$('#top-content').css('left', -$(this).scrollLeft() + "px");
});
However, I have come across an issue within IE(version 9). The issue is that when the user scrolls the website (creating a minus left margin on the "top-content" div, to give the effect of scrolling) and then if they maximize the webpage, the left margin is still present causing the div to not be centered.
I have attempted to remedy this with the jQuery below, but as of yet no luck
$(window).resize(function() {
if ($("#top-content").width() < $(window).width()) {
$('#top-content').css('left:0px');
}
});
Any ideas?

You better do
$('#top-content').css('left', '0px');
In your resize event.

How to make Bootstrap header that changes size on scroll down?

I've seen a few different threads seemingly about this but none of the answers in them have a working solution for me.
Here's what I want:
Big transparent header with a big logo on the top.
Small colored header with a small logo when user has scrolled past the topmost area.
I'm using navbar-fixed-top and and Bootstrap's scrollspy to add and remove certain classes from the header.
Here's why it hasn't worked so far:
$(window).scrollTop() doesn't return anything meaningful at all.
It seems wrong to change at a certain amount of pixels from the top anyway, since it can vary between screen resolutions.
Initiating a change based on what activate.bs.scrollspy captures works rather well except it shows the wrong header when I load the page for the first time.
It seems impossible to place a <div id="whatever"> at a certain spot and have the header change when scrollspy finds it. I've tried making the div 1px in dimension and placed at the absolute top of the page, but the scrollspy still identifies it from way off.
Here's my jQuery code at the moment, which is very imprecise AND shows the wrong header at the first load of the page (remember, you're not always at the top of the page when loading (reloading) the page!).
$(document).ready(function() {
$('body').scrollspy({ target: '.navbar-inverse' });
$('#main-header').on('activate.bs.scrollspy', function () {
var currentItem = $('.nav li.active > a').text();
var header = $('.navbar');
var logosmall = $('.small-brand');
var logobig = $('.big-brand');
if (currentItem == 'top' && header.hasClass('navbar-small')) {
header.removeClass('navbar-small');
header.addClass('navbar-big');
logosmall.css('display', 'none');
logobig.css('display', 'inline-block');
}
else if (currentItem != 'top' && header.hasClass('navbar-big')) {
header.removeClass('navbar-big');
header.addClass('navbar-small');
logobig.css('display', 'none');
logosmall.css('display', 'inline-block');
}
});
});

Wrap your code into window scroll event as mentioned below then only $(window).scrollTop() will work as you expecting.
$(window).scroll(function () {});

Here is a great example of your problem, it is a bit tricky to shrink your navbar but not impossible. You have to take into account a lot of things. I found this a while ago: http://www.bootply.com/109943
It is really strange that $(window).scrollTop() does not return anything by the way. What browser are you on? And your problem with reloading the browser:
$(window).load(function{
//logic to check how far scrolled
})

Overflow Breaking ScrollTop / Not Registering Scroll

I have some CSS-driven parallax scrolling on my site, and I would also like to have a fixed top navigation bar appear when the user begins to scroll down the page. Currently, the nav bar only appears after you have scrolled PAST the end of the window (and disappears again when the window has "rubber banded" back into position). I'm using Chrome v38 on a Macbook. It looks like the overflow-x in my CSS is causing the scroll not to register/fire, but that's necessary for the parallax effect. Any help would be appreciated. Thanks.
CodePen example: http://codepen.io/anon/pen/jEPqYL (doesn't work exactly like in a browser, but that is my current code.)
My JS is:
(function($) {
$(document).ready(function() {
$(window).scroll(function() {
if ($(this).scrollTop() > 0) {
$('#header').fadeIn(500);
} else {
$('#header').fadeOut(500);
}
});
});
})(jQuery);

scroll top on mobiles dont work smooth

I have made a function wich runs on the computer very well. But on mobiles the position refreshes only when the scrolling stops. Its a known problem and i found answers but I didnt get it in my function working. Maybe one of you can help me.
my function:
$(window).scroll(function () {
if ($(window).scrollTop() >600) {
$('#logo').css('position', "fixed");
$('#logo').css('top', 0);
}
else if($(window).scrollTop() < 600) {
$('#logo').css('position', "relative");
$('#logo').css('top', 600)
}
});
and in the internet i found this which i should replace in my function:
$('body').on({
'touchmove': function(e) {
console.log($(this).scrollTop()); // Replace this with your code.
}
});
or this:
$('body').bind('touchmove', function(e) {
console.log($(this).scrollTop()); // Replace this with your code.
});
It would be nice if someone could rewrite my function so that it works smoothly on mobiles.
I explain shortly what this function do. When you load my page there is a blackscreen with a headline in the middle of the screen. Nothing else. when you scroll down the title should move up normaly until he reaches the top. when it reaches the top it gets the "position: fixed" attribute. when you scroll up it gets the "position: relative" attribute again. Nothing else should happen. But on mobiles the text scrolls up until the scrolling stops (most of the time you scroll the text out of the screen) and pop up on the fixed position. But when it is fixed everything is ok and it stands there.

jQuery scrolling DIV is jumpy and positioned incorrectly

Not too long ago I asked about setting up a DIV which scrolls with the rest of the page. Post can be found here.
I've set this up, using the following code:
JS..
jQuery(function ($) {
var el = $('#sidebar'),
pos = el.position().top;
alert(pos);
$(window).scroll(function() {
el.toggleClass('fixed', $(this).scrollTop() >= pos);
});
});
CSS..
/* profile sidebar */
#sidebar>div{ width: 300px; margin-top: 10px; }
#sidebar.fixed>div{position:fixed;top:0}
A copy of the page can be found here. The alert was just some debugging.
The problem is, when you scroll a small amount, #sidebar suddenly appears at the very top of the page. In addition, sometimes as you scroll further down, the sidebar appears - and sometimes it doesn't.
Any idea what might be causing such seemingly random functionality?

I'm still trying to figure out why it works in the first place in the jsfiddle example, but anyway, I know how to fix it:
$(window).scroll(function() {
if($(this).scrollTop() >= pos){
el.addClass('fixed');
}else{
el.removeClass('fixed');
}
});
I tested this by unbinding the event you had and replacing it with this code. It seemed to work fine.
The reason I can't understand why it works in the example: toggleClass should be constantly adding and removing "fixed" if you have scrolled enough, because the conditional is true (true here means whether to toggle). The constant adding and removing of the fixed class causes the jumpy behavior.
You can watch this on your page: open up some dev tools (firegubg or Chrome) and watch what happens to your sidebar element.
[UPDATE]
Actually, I misread the docs. True means the class should be added (I don't think the docs are very clear though). Thus... the only way I could explain this is if #dunc was running jQuery v1.2 and the switch was getting ignored completely...