Develop Reference

jQuery scroll function only works once

I am trying to add a class to the header if the user scrolls past the div #home - and remove the class when you scroll back to the top.
The issue is, when you scroll past the div it adds the class but when you keep scrolling and then scroll back up, the class does not get removed. The event is only firing once...
I created this jsFiddle here - https://jsfiddle.net/breezy/9evksr7y/
It works in my jsFiddle file but not on my actual web page, I've also tried this...
$(window).on( 'scroll', function() {
var header = $('#header'),
target = $("#home").offset().top;
var interval = setInterval(function() {
if ($(window).scrollTop() > 400) {
// alert("made it!");
header.addClass('fixed');
clearInterval(interval);
} else {
header.removeClass('fixed');
}
}, 250);
});
But it still does not work. Any idea what I am doing wrong?
Thanks
Edit: The issue was that one of my other functions in the same document was conflicting w/ this scroll function.

So I made some minor tweaks to the code. Not sure what the issue was but this seemed to work for me on my webpage.
$(window).on('scroll', function() {
var header = $('#header'),
target = $("#home").offset().top;
if ($(window).scrollTop() > target) {
header.addClass('fixed');
} else {
header.removeClass('fixed');
}
});

Back to top button not triggering properly

I have a back to top button that appears when you scroll a little bit .It's working fine but when scrolling if I get to the footer i want the button to go above the footer.
I used the jquery animate method to change the bottom css rule of the button when I get to the bottom of the page.But that effect doesn't happen instantly on my website because i have more javascript and i think it needs to go through all the code before it runs the effect and It's just not working properly.
Where is the problem ? .Here is what I have done : JSFIDDLE
var offset = 250;
var duration = 500;
$(window).scroll(function () {
if ($(this).scrollTop() > offset) {
$('.back-to-top').fadeIn(duration);
} else {
$('.back-to-top').fadeOut(duration);
}
});
$('.back-to-top').on('click', function () {
event.preventDefault();
$('html,body').animate({ scrollTop: 0 }, duration);
return false;
});
$(window).scroll(function () {
if ($(window).scrollTop() + $(window).height() == $(document).height()) {
$('.back-to-top').animate({ 'bottom': '400px' });
} else $('.back-to-top').animate({ 'bottom': '10%' });
});

It seems like adding a class that changes the position of the div, and toggling it when the condition is true solved the problem .

give element class when scrolling

I would like to give an element a .class when user scrolls a page. And then take it away (.class) when user stops scrolling.
Simply speaking, I want to give font awesome icon class fa-spin only when page is being scrolled, and when scrolling stops, icon stops spinning.
Would be nice to know how to just generally apply css animation when scrolling.
Thanks

You can use https://github.com/ssorallen/jquery-scrollstop
var $el = $('.element');
$(window).on("scrollstart", function() {
$el.addClass('scrolling')
})
$(window).on("scrollstop", function() {
$el.removeClass('scrolling')
})

You can use addClass and removeClass on scroll event as follow.
This will add class when scrolling and remove it after delay of 100 milliseconds.
$(window).scroll(function() {
$('div').addClass('myClass');
setTimeout(function() {
$('div').removeClass('myClass');
}, 100);
});
DEMO

You can use like this:
$(window).scroll(function() {
$('div').addClass('blue');//add class on scroll
clearTimeout($.data(this, 'scrollTimer'));
$.data(this, 'scrollTimer', setTimeout(function() {
$('div').removeClass('blue');//remove class on scrolling stops
}, 250));
});
demo

To add e.g. fadeIn animation on scroll you can do as following:
$(window).scroll(function () {
$('#second').delay(1000).fadeIn('slow');
(delay is optional)
Check example: jsfiddle.net

Scrolling up and down by a set amount of pixels using jQuery scrollTop

I have a list of links in a div with overflow. What I want to happen is that the user can navigate in this menu of links with an up and down button. I want the div to scroll up or down by the height of 1 link element every time the user clicks the corresponding button. I tried out some code but I can't seem to figure out how to make it scroll the right amount in both directions. Can anyone help me out?
All the links have the same class.
Edit:
I have already managed to scroll up and down. Now I just need to scroll in little steps of the height of 1 link.
$(function() {
var ele = $('#scroller');
var speed = 10, scroll = 5, scrolling;
$('.scroller-btn-up').click(function() {
// Scroll the element up
scrolling = window.setInterval(function() {
ele.scrollTop( ele.scrollTop() - scroll );
}, speed);
});
$('.scroller-btn-down').click(function() {
// Scroll the element down
scrolling = window.setInterval(function() {
ele.scrollTop( ele.scrollTop() + scroll );
}, speed);
});
$('.scroller-btn-up, .scroller-btn-down').bind({
click: function(e) {
// Prevent the default click action
e.preventDefault();
},
mouseleave: function() {
if (scrolling) {
window.clearInterval(scrolling);
scrolling = false;
}
}
});
});

That should be easy enough using your current code, all you have to do is get rid of the interval to stop it from scrolling repeatedly. Then you won't need the mouseleave function either, you can set the scroll variable to the same value of the height of a link tag e.g. 20 for a 20px high link tag:
$(function() {
var ele = $('#scroller');
var scroll = 20;
$('.scroller-btn-up').click(function() {
// Scroll the element up
ele.scrollTop(ele.scrollTop() - scroll);
});
$('.scroller-btn-down').click(function() {
// Scroll the element down
ele.scrollTop(ele.scrollTop() + scroll);
});
$('.scroller-btn-up, .scroller-btn-down').bind({
click: function(e) {
// Prevent the default click action
e.preventDefault();
}
});
});

Fade in/out div scrollTop

I have a floating menu that i want to fade in when you start to scroll down the page, then fade out when you are back at the top of the page. I have got it working without the fade, but im not sure how to add the fades. Any help appreciated. Thanks.
$(document).scroll(function() {
$('#floatingnav').toggle($(this).scrollTop()>250)
});
css
#floatingnav {
position:fixed;
display:none;
}

You can use fadeToggle with some duration as an argument(just incase you want) instead of plane toggle.That will do your job.
$(document).scroll(function() {
$('#floatingnav').fadeToggle($(this).scrollTop()>250)
});

You can try this to test if div has reached top
$(window).scroll(function () {
var d = $('div'); // this is your fixed div
if (d.offset().top > 250) {
d.fadeIn();
} else {
d.stop().fadeOut();
}
});
TEST FIDDLE

$(window).bind("scroll", function() {
if ($(this).scrollTop() > 250) {
$("#floatingnav").fadeIn();
} else {
$("#floatingnav").stop().fadeOut();
}
});