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html scroll to flickers page

Why when a user clicks a link in the list does it cause the browser to flicker? This seems to be very apparent when a user clicks the same 'link' twice. Is there a way for me to remove this from happening?
It also appears to happen if you click a link that scrolls upwards instead of down. To test this click the list item 'Test' and then click 'Why'
https://jsfiddle.net/JokerMartini/9vne9423/
Here is the main JS bits which are doing all the work...
JS
function scroll_to_element(element) {
$('html, body').animate({scrollTop: $(element).offset().top}, 500);
}
$(window).ready(function() {
$(".nav-title").click(function() {
var target = $(this);
// get data-filter text
var title = target.data('title').toLowerCase();
// collect section titles
sections = $( ".section-title" );
// loop through and scroll to valid section
for (i = 0; i < sections.length; i++) {
var section = $(sections[i]);
var section_title = section.data('title').toLowerCase();
if (section_title === title) {
scroll_to_element(section)
// console.log(target);
}
}
});
});

You should prevent the default behavior of the anchor tag before invoking your custom functionality:
$(".nav-title").click(function(e) {
e.preventDefault();
});
Updated Fiddle

put href="javascript:void(0);" instead of href="#" attribute in your "What is", "Why" and "Test1" links
jsfiddle

Pure js add and remove (toggle) class after scrolling x amount?

I don't want to use jQuery for this.
It's really simple, I just want to add a class after scrolling past a certain amount of pixels (lets say 10px) and remove it if we ever go back to the top 10 pixels.
My best attempt was:
var scrollpos = window.pageYOffset;
var header = document.getElementById("header");
function add_class_on_scroll() {
header.classList.add("fade-in");
}
function remove_class_on_scroll() {
header.classList.remove("fade-in");
}
window.addEventListener('scroll', function(){
if(scrollpos > 10){
add_class_on_scroll();
}
else {
remove_class_on_scroll();
}
console.log(scrollpos);
});
But console shows a number that continues to grow regardless of scrolling up or down. And the class fade-in never gets added, though console shows we past 10.

You forgot to change the offset value in the scroll handler.
//use window.scrollY
var scrollpos = window.scrollY;
var header = document.getElementById("header");
function add_class_on_scroll() {
header.classList.add("fade-in");
}
function remove_class_on_scroll() {
header.classList.remove("fade-in");
}
window.addEventListener('scroll', function(){
//Here you forgot to update the value
scrollpos = window.scrollY;
if(scrollpos > 10){
add_class_on_scroll();
}
else {
remove_class_on_scroll();
}
console.log(scrollpos);
});
Now you code works properly
Explanation
There is no documentation for that, like you asked for. This is just an issue in the logic workflow.
When you say that scrollpos = window.scrollY your page is at an top-offset of 0, so your variable stores that value.
When the page scrolls, your scroll listener will fires. When yout listener checks for the scrollpos value, the value is still 0, of course.
But if, at every scroll handler, you update the scrollpos value, now you can have a dynamic value.
Another option is you to create a getter, like
var scrollpos = function(){return window.scrollY};
This way you can dynamically check what that method will return for you at every offset.
if(scrollpos() > 10)
See? Hope that helped. (:

One simple way to achieve what you want (one line of code inside the scroll event):
window.addEventListener('scroll', function(e) {
document.getElementById('header').classList[e.pageY > 10 ? 'add' : 'remove']('fade-in');
});
#header {
height: 600px;
}
.fade-in {
background-color: orange;
}
<div id='header'></div>

just use the method toggle in classList
header.classList.toggle('fade-in')

Updating the class name of Div based on top position

Actually i am trying to achieve smooth scrolling in Jquery, and whatever code i have written seems to be working fine, but i also want to implement a feature where my Nav Class Changes to active when user scroll down/up based on the position. Below link to code will give you more idea on what i am talking about. problem i am facing is even though i click on the next nav sub element active class is set to previous element. i have user window.scroll of query infact this part is actually got it from net. i really dint understand the code that is why its hard fa me debug and fix it, so if anyone is able to fix it, it would be really good if you explain me what this code is actually doing and what is the problem with current implementation.
http://codepen.io/anon/pen/GqJmK
JS
$(document).ready(function(){
var lastId,
header = $("#header"),
topMenu = $("#nav"),
topMenuHeight = topMenu.outerHeight()+header.outerHeight()+25,
menuItems = topMenu.find("a"),
//menuItems = topMenu.find("a:not([href^='http://'],[href^='/'])"),
scrollItems = menuItems.map(function(){
var item = $($(this).attr("href"));
if (item.length) { return item; }
});
menuItems.on('click',function (e) {
e.preventDefault();
_this = this;
var target = _this.hash,
$target = $(target);
//menuItems.parent().removeClass("active");
//$(_this).parent().addClass("active");
$('html, body').stop().animate({
'scrollTop': ($target.offset().top) - topMenuHeight + 1
}, 900, 'swing', function () {
window.location.hash = target;
});
});
$(window).scroll(function(){
var fromTop = $(this).scrollTop()+topMenuHeight;
var cur = scrollItems.map(function(){
if (($(this).offset().top +20)< fromTop){
return this;
}
});
cur = cur[cur.length-1];
var id = cur && cur.length ? cur[0].id : "";
if (lastId !== id) {
lastId = id;
menuItems
.parent().removeClass("active")
.end().filter("[href=#"+id+"]").parent().addClass("active");
}
});
/*$( window ).resize(function() {
alert($( window ).width());
alert($( document ).width());
}); */
});

You might be best off using some sort of a plugin to achieve this effect. Something like http://lirancohen.github.io/stickUp/ or http://www.outyear.co.uk/smint/demo/ would do the trick

Just update your scroll check function & make your position check little more flexible i.e let it consider that you entered a section little before it enters it. Make this change on line 35 in your code -
if (($(this).offset().top - 50)< fromTop)
WORKING DEMO - http://codepen.io/nitishdhar/pen/LEAzI
You can also improve your UI by implementing this - http://css-tricks.com/hash-tag-links-padding/

Scrolling to Div IDs with Jquery

Due to css properties my scrolling to div tags has too much margin-top. So I see jquery as the best solution to get this fixed.
I'm not sure why this isn't working, I'm very new to Js and Jquery. Any help us greatly appreciated.
Here is a quick look at Js. I found that when your div ids are in containers to change the ('html, body') to ('container)
Here is my jsfiddle
jQuery(document).ready(function($){
var prevScrollTop = 0;
var $scrollDiv = jQuery('div#container');
var $currentDiv = $scrollDiv.children('div:first-child');
var $sectionid = 1;
var $numsections = 5;
$scrollDiv.scroll(function(eventObj)
{
var curScrollTop = $scrollDiv.scrollTop();
if (prevScrollTop < curScrollTop)
{
// Scrolling down:
if ($sectionid+1 > $numsections) {
console.log("End Panel Reached");
}
else {
$currentDiv = $currentDiv.next().scrollTo();
console.log("down");
console.log($currentDiv);
$sectionid=$sectionid+1;
console.log($currentDiv.attr('id'));
var divid =$currentDiv.attr('id');
jQuery('#container').animate({scrollTop:jQuery('#'+divid).position().top}, 'slow');
}
}
else if (prevScrollTop > curScrollTop)
{
// Scrolling up:
if ($sectionid-1 == 0) {
console.log("Top Panel Reached");
}
else {
$currentDiv = $currentDiv.prev().scrollTo();
console.log("up");
console.log($currentDiv);
$sectionid=$sectionid-1;
var divid =$currentDiv.attr('id');
jQuery('html, body').animate({scrollTop:jQuery('#'+divid).position().top}, 'slow');
}
}
prevScrollTop = curScrollTop;
});
});

I'm not entirely sure what you want but scrolling to a <div> with jQuery is simpler than your code.
For example this code replaces the automatic jumping behaviour of anchors with smoother scrolling:
$(document).ready(function(e){
$('.side-nav').on('click', 'a', function (e) {
var $this = $(this);
var top = $($this.attr('href')).offset().top;
$('html, body').stop().animate({
scrollTop: top
}, 'slow');
e.preventDefault();
});
});
You can of course adjust the top variable by adding or removing from it like:
var top = $($this.attr('href')).offset().top - 10;
I have also made a fiddle from it (on top of your HTML): http://jsfiddle.net/Qn5hG/8/
If this doesn't help you or your question is something different, please clarify it!
EDIT:
Problems with your fiddle:
jQuery is not referenced
You don't need jQuery(document).ready() if the jQuery framework is selected with "onLoad". Remove the first and last line of your JavaScript.
There is no div#container in your HTML so it's no reason to check where it is scrolled. And the scroll event will never fire on it.
Your HTML is invalid. There are a lot of unclosed elements and random tags at the end. Make sure it's valid.
It's very hard to figure out what your fiddle is supposed to do.

Jscrollpane and internal anchor links

I am using Jscrollpane and everything works great, except when I try to use it with an internal anchor.
It should work like the example on the official page.
But in my example it really destroys my site. The whole content is floating upwards and I can't figure it out myself.
Here is my page: http://kunden.kunstrasen.at/htmltriest/index.php?site=dieanreise&user_lang=de
and if the inner anchor is clicked: http://kunden.kunstrasen.at/htmltriest/index.php?site=dieanreise&user_lang=de#westautobahn
Anybody a clou whats going on here?
Thanks for your help.

jspane does not work with old style anchors
e.g.
<a name="anchor"></a>
instead you have to write
<a id="anchor"></a>
additionaly you have to enable
hijackInternalLinks: true;
in jScrollPane settings Object.
The hijackInternalLinks also captures links from outside the scrollpane, if you only need internal links you can add this code, like hijackInternalLinks it binds the click funktion on the a elements and calls the scrollToElement with the target:
\$(document).ready(function() {
panes = \$(".scroll");
//hijackInternalLinks: true;
panes.jScrollPane({
});
panes.each(function(i,obj){
var pane = \$(obj);
var api = pane.data('jsp');
var links = pane.find("a");
links.bind('click', function() {
var uriParts = this.href.split('#');
if (uriParts.length == 2) {
var target = '#' + uriParts[1];
try{
api.scrollToElement(target, true);
}catch(e){
alert(e);
}
return false;
}
});
});
});
but note you will always have to use the id attribute on a tags.
If you are using tinymce you can repair the code with this function
function myCustomCleanup(type, value) {
switch (type) {
case "get_from_editor_dom":
var as = value.getElementsByTagName("a");
for(var i=0; i< as.length;i++){
if (as[i].hasAttribute('name')){
var name = as[i].getAttribute('name');
as[i].setAttribute('id',name);
}
}
break;
}
return value;
}