I am attempting to create a navigation bar that slides up and off the screen when a user scrolls down, and then scrolls back down when a user stops scrolling / scrolls up. Below is a snippet of my script and a jsfiddle:
$(document).ready(function() {
var position = $(window).scrollTop();
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll > position) {
$('.nav').addClass('active');
} else {
$('.nav').removeClass('active');
}
position = scroll;
});
});
https://jsfiddle.net/z2uc89sL/
Coupled with my CSS this works fine in all the browsers I have tested it in except for Safari (I'm running version 9.0.2 on a Mac). The problem that is occurring is that when you hit the top of page and there is no further room to scroll up, the nav gets hidden again by re sliding up (as though the user was actually scrolling down again rather than butting up to the top of the page). The opposite is happening at the bottom of the page too.
If you look at the fiddle in Safari you will see the issue I am talking about. If you look at the fiddle in any other browser you'll see what I'm trying to achieve.
This is because of bouncing effect in safari.
You can disable it with some extensions like iNoBounce.
Or simply compare current position like this.
if (scroll > position && position > 0) {
$('.nav').addClass('active');
} else if (position < $(window).height()){
$('.nav').removeClass('active');
}
Below i tried to provide you two different answers, First solution is related to your .nav class while Second is simulation of same functionality as a function. So, it could be reused.
var el = $(".nav");
$(window).scroll(function() {
el.addClass('active');
clearTimeout($.data(this, "scrollCheck"));
$.data(this, "scrollCheck", setTimeout(function() {
el.removeClass('active');
}, 250));
});
/*
* As a Function
*/
function scrollFunc(el) {
var el = el;
$(window).scroll(function() {
el.addClass('active');
clearTimeout($.data(this, "scrollCheck"));
$.data(this, "scrollCheck", setTimeout(function() {
el.removeClass('active');
}, 250));
});
}
scrollFunc($('nav'));
To see the results online, Please have a look at my fiddle https://jsfiddle.net/yeoman/g19nejfu/1/ i forked your question and update it with working answer.
I would love to explain about what's going on but actually this question is somehow answered already. So, for that purpose, i will share some useful links. One should check them out to understand it.
jQuery scroll() detect when user stops scrolling
http://gabrieleromanato.name/jquery-check-if-users-stop-scrolling/
Hope that my answer will you. Thanks, Cheers!
Related
I'm trying to achieve a sliding scroll (like fullPage.js) by myself. I don't want to create a plugin either use a plugin. I only want to scroll/slide to a section when user trigger scroll (up and down!).
I've searched all over the internet and I do not know how to prevent the user from scrolling to replace standard scroll behavior by my animated scroll (desktop and mobile). I want to implement this animation inside a Bootstrap carousel item.
Summarizing, I have a carousel with several items, and each item will have a caption (outside the viewport). When the user scrolls down, then I will show the caption (like third slide here), and when the user scrolls up, I will scroll up and hide the caption.
Here is the CodePen with the carousel example running: link
This is what I get so far (I've got part of the code from StackOverflow)...
$(function(){
var _top = $(window).scrollTop();
var _direction;
$(window).scroll(function(){
var _cur_top = $(window).scrollTop();
if(_top < _cur_top)
{
_direction = 'down';
window.scrollTo(0, document.body.scrollHeight);
} else {
_direction = 'up';
window.scrollTo(0, 0);
}
_top = _cur_top;
console.log(_direction);
});
});
I get a very (very!) slow animation... It is not smooth at all.
I've tried this too:
$(document.body).on('DOMMouseScroll mousewheel', function (event) {
event.preventDefault();
if (event.originalEvent.wheelDelta > 0 || event.originalEvent.detail < 0) {
// Scroll up
$("html, body").animate({scrollTop: 0}, 400);
}
else {
// Scroll down
}
});
But, that code does not work and I get this error: [Intervention] Unable to preventDefault inside passive event listener due to the target being treated as passive.
I will be very thankful if you can help me, please!
Edited:
Someone helped me at "StackOverflow en español". Here is the solution!! Many thanks to #matahombres ;)
I have a site where I have each section as 100vh so it fills the height of the screen perfectly. The next step I wanted to implement was disabling the regular scrolling, and on scroll force the screen to jump smoothly to the top of the next 100vh section. Here is the example of this animation / feature:
https://www.quay.com.au/
I was having a hard time finding any answers for this as most things just deal with smooth scrolling when clicking on anchors, not actually forcing div relocation when the user scrolls up / down.
I just wanted to know what code I would need do this...
Thanks, been using stack overflow for a while but first post, let me know if there is anything I can do to make this more clear.
disclaimer: this solution needs some testing and probably a bit of improvements, but works for me
if you don't want to use a plugin and prefer a vanilla JavaScript solution I hacked together a small example how this can be achieved with JS features in the following codepen:
https://codepen.io/lehnerchristian/pen/QYPBbX
but the main part is:
function(e) {
console.log(e);
const delta = e.deltaY;
// check which direction we should scroll
if (delta > 0 && currentlyVisible.nextElementSibling) {
// scroll downwards
currentlyVisible = currentlyVisible.nextElementSibling;
} else if (delta < 0 && currentlyVisible.previousElementSibling) {
// scroll upwards
currentlyVisible = currentlyVisible.previousElementSibling;
} else {
return false;
}
// perform scroll
currentlyVisible.scrollIntoView({ behavior: 'smooth' });
e.preventDefault();
e.stopPropagation();
}
what it does is that it listens for the wheel event and then calls the callback, which intercepts the scroll event. inside the callback the direction is determined and then Element.scrollIntoView() is called to let the browser do the actual scrolling
check https://caniuse.com/#search=scrollintoview for browser support, if you're going for this solution
I am using Jquery to create an effect that will change things as the user scrolls
$(function() {
var headerPosition = $(".home-header");
$(window)
.scroll(function() {
var scroll = $(window)
.scrollTop();
if (scroll >= 200) {
headerPosition.addClass("home-header-color");
} else if (scroll <= 600) {
headerPosition.removeClass("home-header-color");
}
});
});
This is what i'm using a simple add remove class function that gets triggered on a certain scroll amount.
What I want to do is to make it as a user scrolls once no matter how fast.
This is what I came up with but dose not work well scrolling up.
Codepen
I want it to only appear when you reach the top of the screen when scrolling up. Not on just one scroll up.
I tried combining the two but it didn't work out well.
I have a form that is sticky on every page, and I need it to stop being sticky when it reaches the top of the footer. I have this working properly, but I need it to become sticky again when scrolling back up the page. Anything glaringly wrong?
$(window).scroll(function(){
var footerTopPos = $('#footer-wrapper').offset().top;
var navBottomPos = $('#footer-form-wrapper').offset().top;
if(navBottomPos >= footerTopPos) {
$('#footer-form-wrapper').addClass('sticky');
} else {
$('#footer-form-wrapper').removeClass('sticky');
}
});
To clarify, the first part works perfectly. The css changes from "fixed" to "absolute" and the form stays in place. The problem is, I want it to revert back to "fixed" when you start scrolling back up the page (my else statement). This part does nothing at all.
Here is a rough jsfiddle to show the issue http://jsfiddle.net/L693f5bg/14/
--Edit--
To keep what you have started with the same and not use any other plugins you have to make sure you are declaring the variable outside the scroll function so that it doesn't get changed every time you scroll and change its position.
$(function () {
var footerTopPos = $('#footer-form-wrapper').offset().top;
$(window).scroll(function () {
var windowTopPos = $(window).scrollTop();
if (windowTopPos >= footerTopPos) {
$('#footer-form-wrapper').css('position', 'absolute');
$('#footer-form-wrapper').css('top', '0');
} else {
$('#footer-form-wrapper').css('position', 'fixed');
$('#footer-form-wrapper').css('bottom', '0');
$('#footer-form-wrapper').css('top', 'auto');
}
});
});
Updated your JSFiddle
Personally I recommend using Waypoints.js and the sticky elements plugin. It does everything and it's super clean and easy to implement. include the jquery.waypoints.js and the sticky plugin then initialize using:
var sticky = new Waypoint.Sticky({
element: $('#footer-wrapper')[0],
offset: '90%',
stuckClass: 'unstuck'
});
I updated the JSFiddle using the Waypoints.js plugin
Im fairly new to JS... please be gentle.
Can anyone suggest a way to pull off a delayed autoscroll effect on a block of text?
It's important to mention that my ultimate goal is to use this on a popup modal window, on iOS devices. And because iOS browsers do not display the scrollbar until user interaction, I am resorting to the auto-scroll.
In effect: I would like the page to load, wait a couple of seconds, then have begin to slowly scroll down. The scroll is intended to be a hint to the user that there is more content available, therefore if there is any way to stop or temporarily pause the auto-scroll on user interaction- that would be optimal.
I have searched for my answers a couple of hours now, but between not being able to initialize the found code to my design (again, I'm fairly green), and not being able to find a solution that achieves everything I need - I am turning to brighter minds.
I have set up a fiddle with my HTML and CSS: http://jsfiddle.net/zfMsQ/
Any help is greatly appreciated!
ps: This is my very first post on StackOverflow :)
My code:
Extensive. Linked above.
Here you go: http://jsfiddle.net/zfMsQ/3/
var roll = true;
var max = 0;
var text = $("#content");
function scroll() {
text.scrollTop(text.scrollTop() + 1)
var top = text.scrollTop()
if (top > max) {
max = top
if (roll) {
setTimeout(scroll, 50)
}
}
}
text.on("mouseenter mouseover mousedown", function(){
roll = false;
})
setTimeout(scroll, 2000)