Develop Reference

Jquery Hide header at first and show it on scroll up

Here’s a demo page.
https://codyhouse.co/demo/full-screen-pop-out-navigation/index.html
How to hide the header when the screen is on the top of the page, and it will only show on scroll up

hi try following...
$(window).scroll(function() {
var _hideVal = 50; //You can change this value...
if ($(window).scrollTop() > _hideVal)
{
$('.header-holder').fadeIn();
}
else
{
$('.header-holder').fadeOut();
}
});

How to prevent a link outside a function from triggering it on scroll

This seems like an easy fix, but can't seem to figure it out. I have a table that spawns a fixed header whenever you scroll on it. It's working well, however, an unconnected link near the top of this page, via jquery, scrolls the cursor to the bottom of the page til it hits an anchor. As a result, it quickly moves over the table, spawning the fixed menu, then after reaching the anchor, the fixed menu awkwardly sits there for a second or two, then disappears.
I'm trying to prevent that by disabling the function on click of the link. I've tried e.preventDefault (), but no joy. Here's the fiddle and code (so looking to prevent the fixed "Header / Description" row when you click the link).
Fiddle
// top edge of table
var element_menu_hdr = $(".row-1").offset().top;
var element_menu_end_check = $(".row-12").offset().top;
$(window).on("scroll", function fixmenu() {
var y_scroll_pos = window.pageYOffset;
var scroll_menu_hdr = element_menu_hdr;
var scroll_menu_end_check = element_menu_end_check;
if(y_scroll_pos >= scroll_menu_hdr) {
if($('.affix').length === 0){
$('.row-1.odd').wrap('<table class="tablemain affix view"></table>');
}
} else if (y_scroll_pos < scroll_menu_hdr) {
$('.tablemain.affix.view').contents().unwrap();
} else {
}
});
// bottom edge of table
var element_menu_end = $(".row-12").offset().top;
$(window).on("scroll", function fixmenubtm() {
var y_scroll_pos2 = window.pageYOffset;
var scroll_menu_end = element_menu_end;
if(y_scroll_pos2 > scroll_menu_end) {
$('.tablemain.affix.view tbody').contents().unwrap();
} else {
}
var myVar = y_scroll_pos2;
console.log(myVar, "y_scroll_pos2");
var myVar2 = element_menu_end;
console.log(myVar2, "element_menu_end");
});
jQuery(document).ready(function($) {
$(".scroll").click(function(event){
event.preventDefault();
$('html,body').animate({scrollTop:$(this.hash).offset().top}, 500);
});
});

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');
}
});

Change image through add/remove class in Javascript. What about at initial page scroll =0?

I'm currently trying to change my header logo when the user scrolls past the dark background to a lighter background. I got the add/remove class working, but right when the user loads the page the image doesn't show because it executes when the scroll is greater than 0 pixels scroll. How do I show the initial conditions from page load without the user having scrolled already?
$(function() {
var header = $(".logo");
var about = $(".angle").offset().top;;
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll >= about) {
header.removeClass('lightLogo').addClass('darkLogo');
} else {
header.removeClass('darkLogo').addClass('lightLogo');
}
});
});

The simplest might be to just add the class initially, like so:
$(function() {
var header = $(".logo").addClass('lightLogo');
var about = $(".angle").offset().top;;
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll >= about) {
header.removeClass('lightLogo').addClass('darkLogo');
} else {
header.removeClass('darkLogo').addClass('lightLogo');
}
});
});
Now the header will start out with .lightLogo at page load.

Div stops at the top when scrolling

I am trying to make a div change class to fixed when it reach the top of the page.
I have this JavaScript code.
<script type="text/javascript">
$(function () {
var top = 200;
var y = $(this).scrollTop();
if (y >= top) {
// if so, add the fixed class
$('#kolonne-v').addClass('fixed');
} else {
// otherwise remove it
$('#kolonne-v').removeClass('fixed');
}
});
</script>
What am i doing wrong?

Demo jsFiddle
JS
$(function () {
var top = 200;
//this should be the offset of the top of your div
//which can be found by doing the following line
//var top = $("#kolonne-v").offset().top;
$(window).on('scroll', function () {
if (top <= $(window).scrollTop()) {
// if so, add the fixed class
$('#kolonne-v').addClass('fixed');
} else {
// otherwise remove it
$('#kolonne-v').removeClass('fixed');
}
})
});
Description
This uses the jquery .on('scroll', handler) method, documentation here. The basic principal is that on document.ready you set the scroll point when your div becomes fixed to the top. Then you setup an .on('scroll', handler) event that triggers whenever the window is scrolled in. If the user scrolls to your point you add the fixed CSS class.