Develop Reference

Fixed side menu inside wrapper

So I have a site that is contained in a wrapper that has a max width. This site also has a fixed side menu that is toggled with a button.
My issue is having the fixed side menu to stay inside the page wrapper as fixed elements are relative to the window not the parent element.
Here is an example using position: fixed: https://jsfiddle.net/okavp4p1/
As you can see the menu is coming out from the side of the viewport, not the wrapper (grey area).
I have found away around this using position: absolute: https://jsfiddle.net/5q3hn1fq/
Here you can see the menu is coming out of the wrapper. (correct)
But I had to write some extra jQuery to spoof fixed positioning on scroll.
// Fix menu
$(window).on('load scroll resize', function() {
navigation.find('ul').css('top', $(window).scrollTop());
});
But doing it this way causes glitches/lag on most web browsers. Though the example isn't to bad when scrolling but when implementing this on an actual site with tons more elements/code it becomes very obvious.
Here is what it looks like in use when scrolling down the page:
I have thought of disabling scrolling when the menu is open but I was just wondering if anyone can help?

there is a work-around for this. you need to create a bar at the top with position:fixed. This bar should have height: 1px and no background-color so you can't see it.
then you can add your navigation inside of there, and float:right. when you float right, it will show up, but will be pinned to the invisible fixed bar at the top. also, you have to give the nav a width of 0 so its invisible. then you can transition its width to 100px or whatever you want on button click.
finally, use jQuery to set its height to the height of the window on resizing of the window, and when you show it.
here's the fiddle: https://jsfiddle.net/ahmadabdul3/pptggn6v/1/
since the bar is inside a position:relative bar, it shouldn't jump around as much (or at all)
do NOT add right or left padding to the navigation though, this will break the effect. instead, you can put a container around the nav, and make the nav width: 90% or something so it appears to have some padding.
here's an updated fiddle with how the padding should be: https://jsfiddle.net/ahmadabdul3/pptggn6v/2/

If performance accross all browsers is the issue, you could re-write your function using plain .js instead of jquery.
I couldn't replicate the jittery movement in chrome, but the below should be put less strain on the browser.
$(window).on('load scroll resize', function() {
document.getElementById('nav-list').style.top = window.scrollY + 'px';
});
https://jsfiddle.net/hb4zsL6g/

fullpage.js - add css class to header when scrolling inside a section

I am using fullpage.js
https://github.com/alvarotrigo/fullPage.js/
on a frontpage of a website and it´s working fine so far.
I have 4 Sections.
The first section has more content than the height of the browser window, so there is the need to scroll inside that section.
I have added the scrollbar and it works with the scrollbar and by using the mousewheel.
Now my problem.
I have a sticky header which I want to reduce in height as soon as there is any scrolling down inside this section (and increase in height as soon as I scroll back up to the top).
So I would like to add the css class "sticky" to the "header" when using the scrollbar of the fullpage.js or the mousewheel so that I can format the header with the class "sticky" differently with css.
Unfortunately the "scroll-Events" doesn´t work here, as already mentioned here:
FullPage.JS Scrolling
I tried the following
$(function(){
window.addEventListener("wheel", function() {
$(document).ready(function(){
var scrollclass = $('.slimScrollBar').position();
if(scrollclass.top > 0){
$('header').addClass('sticky');
}
else{
$('header').removeClass('sticky');
}
});
});})
This kind of works, however the sticky class is not added by the first use of the mousewheel (it´s added by the "second turn of the mousewheel") and is not beeing removed when scrolling back to the top, I need to turn the wheel an additional time after scrolling back to the top to have the sticky class removed again.
If I change the if-statement to >= 0 it works on the first turn of the mousewheel but then I don´t get the class removed when scrolling back to the top.
The second issue is, that this only works by using the mousewheel of course, and not by dragging the scrollbar created by fullpage.js
Any ideas or hints how to solve this?
Thanks
John

you could use the "afterLoad" method, as noted in fullPage.JS's documentation:
https://github.com/alvarotrigo/fullPage.js#afterload-anchorlink-index

'Skips' when using Bootstrap's Affix

I'm attempting to use Bootstraps Affix function in a sticky subnav.
<div class="container" data-spy="affix" data-offset-top="417" id="subnav">
I've dialed the offset so that there's no "skip" or "jump" when the subnav snaps into place. The problem I'm having is that the content below the subnav is jumping up the page, under the nav/subnav, because the subnav is changing from relative to fixed and it loses it's computed height.
Is there a way to counteract this? My initial though its to add/remove a class to the next div that adds in the correct padding or margin.
Here's a jsfiddle to help illustrate the problem. Pay attention to the H2 as you scroll.

I've taken a look at this.
When the 2nd scrolling nav-bar is .affixed, it takes on a position:fixed, and the subsequent div readjusts up into the space where it was, causing the flicker.
I tried listening to affixed.bs.affix without luck, but that's the route I'd check out. See http://getbootstrap.com/javascript/#affix-events.
It should generally be something like:
$("#subnav").on("affixed.bs.affix", function() {
// Adjust the next div here. Add a top margin
});

Adding undetermined white space above a bootstrap 3 affix/scrollspy

If you check out this link, you will see that as you scroll down, the navigation has both affix and scrollspy functionality (From bootstrap 3)
http://codepen.io/datanity/pen/thnua
However, if you add white space at the top, the affix/scrollspy occurs in the wrong location. For example, this is with 800px of white space ontop.
http://codepen.io/datanity/pen/haKzg
Now of course here, you can adjust the affix/scrollspy code so that way it works with the 800px height ontop but, my problem is that I have no idea what space I will have on top. Sometimes it will be 2000px other times only 300px. Also, there is no way for me to know the id/class of the divs that appear ontop. Sometimes it will be 10 divs, sometimes 0, and they will always have different id/classes.
Is there a way that the affix and scrollspy can be triggered relative to the container it is in, and not a fixed px location from the top of the body?
Thanks for any help!
Tim

adding this to the top of the js fixed the issue. With this method, it does not matter how much white space or how many divs you have ontop. Your bootstrap scrollspy and affix will always be in the correct place!
$('#mynav').affix({
offset: {
top: $('#mynav').offset().top
, bottom: function () {
return (this.bottom = $('.bs-footer').outerHeight(true))
}
}
});

Add an ID to the section element (located at the top of the HTML page). I'm assuming this is the element that you're concerned about changing heights.
<section id="top-section" style="height:800px;">
</section>
Then add these lines to your JS file:
var $h = $("#top-section").height() + 280;
$("#mynav").attr("data-offset-top", $h);
This queries the rendered height of the section element, and then fixes your sidebar response height accordingly.
If you will also have an unknown amount of sections, then you should wrap the code that creates the sections in a div element. For instance, if you're using PHP to build the section area of your webpage, you should do something like this:
<div id="section-wrapper">
<?php echo "Whatever code you have here" ?>
</div>

HTML/CSS/JAVASCRIPT : How to move an element and not show scrollbars

i'm trying to slide a div element from outside the page to within the page. However as soon as the element is shown outside the page, horizontal scrollbars appear!
How can I achieve this without the scrollbars appearing?
Any help appreciated very muchly, thanks :)

Briefly, using overflow-x:
function moveStuff() {
$('body').css('overflow-x', 'hidden');
$('#iteminmotion').show().animate(..., function() {
$('body').css('overflow-x', 'auto');
});
}

move the element off the page to the left, moving it off to the right increases the width of the page

You could temporarily turn off side scrolling by applying this css to the body:
body {overflow-x:hidden;}
http://jsfiddle.net/pxfunc/YYUZJ/

Do you really need to construct the element off page, or just make it look like it slides onto the screen? Ive done similar things in the past to emulate a graphic that slides across a page, but instead of starting outside the view area I've created it as far to the side as possible and then animated the slide to the middle. The user experience at that point can be a graphic that slides onto a page from outside the view area.