Added this code to my sticky element using position:sticky
var $sticky = $('.grid-container .sticky'),
$stickyTo = $('.grid-container .stickyTo'),
stickyToTop = $stickyTo.offset().top,
stickyToBottom = stickyToTop + $stickyTo.outerHeight();
$(window).on('scroll', function() {
var scroll = $(window).scrollTop(),
stickyTop = $sticky.offset().top,
stickyBottom = $sticky.offset().top + $sticky.outerHeight();
if (stickyBottom >= stickyToBottom) {
if (scroll < stickyTop) {
//$sticky.addClass('fixed').removeClass('abs');
} else {
//$sticky.addClass('abs');
}
} else if (scroll > stickyToTop) {
$sticky.addClass('stuck');
} else if (scroll < stickyToTop) {
$sticky.removeClass('stuck');
}
});
and I have two sticky elements see image attached but when I scroll to the first section it adds a class "stuck" on the second section, how can I make that only on that section jquery is triggered and not affect the second/other section unless scrolled on
Here is My FIDDLE
Because $sticky in your case is a jQuery collection with two elements in it you have to use .each() loop to check each element separately. Then you probably don't need $stickyTo, because you have to check for each 'sticky' element's own .parent(). Something like this:
var $sticky = $('.grid-container .sticky'),
$(window).on('scroll', function() {
var scroll = $(window).scrollTop()
$sticky.each(function(){
const $this = $(this)
const stickyTop = $this.offset().top,
const stickyBottom = stickyTop + $sticky.outerHeight();
const $stickyTo = $this.parent()
const stickyToTop = $stickyTo.offset().top,
const stickyToBottom = stickyToTop + $stickyTo.outerHeight();
if (stickyBottom >= stickyToBottom) {
if (scroll < stickyTop) {
//$sticky.addClass('fixed').removeClass('abs');
} else {
//$sticky.addClass('abs');
}
} else if (scroll > stickyToTop) {
$sticky.addClass('stuck');
} else if (scroll < stickyToTop) {
$sticky.removeClass('stuck');
}
})
});
Please note though, this function is not really optimized. It would be better to use native javascript during the scroll. Or even better check native CSS position: sticky.
I have been trying to make a simple "smoothscroll" function using location.href that triggers on the mousewheel. The main problem is that the EventListener(wheel..) gets a bunch of inputs over the span of ca. 0,9 seconds which keeps triggering the function. "I only want the function to run once".
In the code below I have tried to remove the eventlistener as soon as the function runs, which actually kinda work, the problem is that I want it to be added again, hence the timed function at the bottom. This also kinda work but I dont want to wait a full second to be able to scroll and if I set it to anything lover the function will run multiple times.
I've also tried doing it with conditions "the commented out true or false variables" which works perfectly aslong as you are only scrolling up and down but you cant scroll twice or down twice.
window.addEventListener('wheel', scrolltest, true);
function scrolltest(event) {
window.removeEventListener('wheel', scrolltest, true);
i = event.deltaY;
console.log(i);
if (webstate == 0) {
if (i < 0 && !upexecuted) {
// upexecuted = true;
location.href = "#forside";
// downexecuted = false;
} else if (i > 0 && !downexecuted) {
// downexecuted = true;
location.href = "#underside";
// upexecuted = false;
}
}
setTimeout(function(){ window.addEventListener('wheel', scrolltest, true); }, 1000);
}
I had hoped there was a way to stop the wheel from constantly produce inputs over atleast 0.9 seconds.
"note: don't know if it can help in some way but when the browser is not clicked (the active window) the wheel will registre only one value a nice 100 for down and -100 for up"
What you're trying to do is called "debouncing" or "throttling". (Those aren't exactly the same thing, but you can look up the difference in case it's going to matter to you.) Functions for this are built into libraries like lodash, but if using a library like that is too non-vanilla for what you have in mind, you can always define your own debounce function: https://www.geeksforgeeks.org/debouncing-in-javascript/
You might also want to look into requestanimationframe.
a different approach
okey after fiddeling with this for just about 2 days i got fustrated and started over. no matter what i did the browsers integrated "glide-scroll" was messing up the event trigger. anyway i decided to animate the scrolling myself and honestly it works better than i had imagined: here is my code if anyone want to do this:
var body = document.getElementsByTagName("BODY")[0];
var p1 = document.getElementById('page1');
var p2 = document.getElementById('page2');
var p3 = document.getElementById('page3');
var p4 = document.getElementById('page4');
var p5 = document.getElementById('page5');
var whatpage = 1;
var snap = 50;
var i = 0;
// this part is really just to read what "page" you are on if you update the site. if you add more pages you should remember to add it here too.
window.onload = setcurrentpage;
function setcurrentpage() {
if (window.pageYOffset == p1.offsetTop) {
whatpage = 1;
} else if (window.pageYOffset == p2.offsetTop) {
whatpage = 2;
} else if (window.pageYOffset == p3.offsetTop) {
whatpage = 3;
} else if (window.pageYOffset == p4.offsetTop) {
whatpage = 4;
} else if (window.pageYOffset == p5.offsetTop) {
whatpage = 5;
}
}
// this code is designet to automaticly work with any "id" you have aslong as you give it a variable called p"number" fx p10 as seen above.
function smoothscroll() {
var whatpagenext = whatpage+1;
var whatpageprev = whatpage-1;
var currentpage = window['p'+whatpage];
var nextpage = window['p'+whatpagenext];
var prevpage = window['p'+whatpageprev];
console.log(currentpage);
if (window.pageYOffset > currentpage.offsetTop + snap && window.pageYOffset < nextpage.offsetTop - snap){
body.style.overflowY = "hidden";
i++
window.scrollTo(0, window.pageYOffset+i);
if (window.pageYOffset <= nextpage.offsetTop + snap && window.pageYOffset >= nextpage.offsetTop - snap) {
i=0;
window.scrollTo(0, nextpage.offsetTop);
whatpage += 1;
body.style.overflowY = "initial";
}
} else if (window.pageYOffset < currentpage.offsetTop - snap && window.pageYOffset > prevpage.offsetTop + snap){
body.style.overflowY = "hidden";
i--
window.scrollTo(0, window.pageYOffset+i);
if (window.pageYOffset >= prevpage.offsetTop - snap && window.pageYOffset <= prevpage.offsetTop + snap) {
i=0;
window.scrollTo(0, prevpage.offsetTop);
whatpage -= 1;
body.style.overflowY = "initial";
}
}
}
to remove the scrollbar completely just add this to your stylesheet:
::-webkit-scrollbar {
width: 0px;
background: transparent;
}
I have a webpage that when scrolled down, the text freezes when it reaches the last paragraph of text but the images keep on scrolling. I've got the implementation working but there is a lot of jank when scrolling with a mouse wheel, not so much if I click and drag the scroll bar.
Are there any optimizations I can make to this code to make work as intended or is there a different way to accomplish the same task?
window.addEventListener('scroll', function (e) {
window.requestAnimationFrame(keepTextStationary);
//keepTextStationary(); // Less janky, but still horrible
});
function keepTextStationary() {
var textRect = writtenContent.getBoundingClientRect();
var imageRec = images.getBoundingClientRect();
if (textRect.bottom < window.innerHeight && document.documentElement.scrollTop > 0) {
writtenContent.style.position = 'relative';
writtenContent.style.bottom = (225 - document.documentElement.scrollTop) + 'px';
if (imagesTop === undefined) {
imagesTop = imageRec.y;
}
} else {
writtenContent.style.bottom = (225 - document.documentElement.scrollTop) + 'px';
}
if (imageRec.y >= imagesTop) {
writtenContent.style.position = '';
}
}
Here is the site so you can see the problem.
https://bowerbankninow.azurewebsites.net/exhibitions/oscar-perry-the-pheasant
You are causing layout trashing every time you call getBoundingClientRect. Try debouncing your scroll events:
var lastScrollY = 0;
var ticking = false;
function keepTextStationary() {
var textRect = writtenContent.getBoundingClientRect();
var imageRec = images.getBoundingClientRect();
if (textRect.bottom < window.innerHeight && lastScrollY > 0) {
writtenContent.style.position = 'relative';
writtenContent.style.bottom = (225 - lastScrollY) + 'px';
if (imagesTop === undefined) {
imagesTop = imageRec.y;
}
} else {
writtenContent.style.bottom = (225 - lastScrollY) + 'px';
}
if (imageRec.y >= imagesTop) {
writtenContent.style.position = '';
}
ticking = false;
}
function onScroll() {
lastScrollY = document.documentElement.scrollTop;
requestTick();
}
function requestTick() {
if (!ticking) {
requestAnimationFrame(keepTextStationary);
ticking = true;
}
}
window.addEventListener('scroll', onScroll );
See this article for in-depth explanation: https://www.html5rocks.com/en/tutorials/speed/animations/
You dont.
Relocations / styling in javascript take place after the CSS has been loaded. Bad practise. What you can do, is make it animated to make it look less horrible.
Why is pure CSS not an option ?
With my current code I can only have one or the other, which is either my sticky navigation or a back to top button that appears at a 100px from the top of the document. Is there any way I can use both?
This is my current code
window.onscroll = function() {navFunction()};
var navbar = document.getElementById("navbar");
var sticky = navbar.offsetTop;
function navFunction() {
if (window.pageYOffset >= sticky) {
navbar.classList.add("sticky")
} else {
navbar.classList.remove("sticky");
}
and
window.onscroll = function() {scrollFunction()};
function scrollFunction() {
if (document.body.scrollTop > 100 || document.documentElement.scrollTop > 100) {
document.getElementById("myBtn").style.display = "block";
} else {
document.getElementById("myBtn").style.display = "none";
}
}
function topFunction() {
document.body.scrollTop = 0; // For Safari
document.documentElement.scrollTop = 0; // For Chrome, Firefox, IE and Opera
}
sorry if this is a silly question. I am still new to this :)
Thanks in advance!
You can call both functions inside window.onscroll anonymous function:
window.onscroll = function() {
navFunction();
scrollFunction();
};
Alternatively, you can use the standard addEventListener method to register both functions:
window.addEventListener("scroll", navFunction);
window.addEventListener("scroll", scrollFunction);
Notice that in this way we don't use the parentheses with the two functions because we're not executing them. We're just telling the event listener the name of the function that it will execute when the event occurs.
One thing you can do is just reorganize your code to call both functions.
// Define the functions and the variables you need first here
// function topFunction() {...} etc
// call both functions inside the scroll event here.
window.onscroll = function() {
scrollFunction();
navFunction()
};
The other way to run multiple functions on an event is by using addEventListener()
window.addEventListener("scroll",scrollFunction,false);
window.addEventListener("scroll",navFunction,false);
You can keep appending as many functions as you want, though you risk making your web page slower.
window.onscroll = function() {onscroll_function()};
var navbar = document.getElementById("navbar");
var sticky = navbar.offsetTop;
function onscroll_function() {
navFunction();
scrollFunction();
//...what ever else you want to trigger
}
function navFunction() {
if (window.pageYOffset >= sticky) {
navbar.classList.add("sticky")
} else {
navbar.classList.remove("sticky");
}
}
function scrollFunction() {
if (document.body.scrollTop > 100 || document.documentElement.scrollTop > 100) {
document.getElementById("myBtn").style.display = "block";
} else {
document.getElementById("myBtn").style.display = "none";
}
}
function topFunction() {
document.body.scrollTop = 0; // For Safari
document.documentElement.scrollTop = 0; // For Chrome, Firefox, IE and Opera
}
I have a div, with a scroll bar, When it reaches the end, my page starts scrolling. Is there anyway I can stop this behavior ?
You can inactivate the scrolling of the whole page by doing something like this:
<div onmouseover="document.body.style.overflow='hidden';" onmouseout="document.body.style.overflow='auto';"></div>
Found the solution.
http://jsbin.com/itajok
This is what I needed.
And this is the code.
http://jsbin.com/itajok/edit#javascript,html
Uses a jQuery Plug-in.
Update due to deprecation notice
From jquery-mousewheel:
The old behavior of adding three arguments (delta, deltaX, and deltaY)
to the event handler is now deprecated and will be removed in later
releases.
Then, event.deltaY must now be used:
var toolbox = $('#toolbox'),
height = toolbox.height(),
scrollHeight = toolbox.get(0).scrollHeight;
toolbox.off("mousewheel").on("mousewheel", function (event) {
var blockScrolling = this.scrollTop === scrollHeight - height && event.deltaY < 0 || this.scrollTop === 0 && event.deltaY > 0;
return !blockScrolling;
});
Demo
The selected solution is a work of art. Thought it was worthy of a plugin....
$.fn.scrollGuard = function() {
return this
.on( 'wheel', function ( e ) {
var event = e.originalEvent;
var d = event.wheelDelta || -event.detail;
this.scrollTop += ( d < 0 ? 1 : -1 ) * 30;
e.preventDefault();
});
};
This has been an ongoing inconvenience for me and this solution is so clean compared to other hacks I've seen. Curious to know how more about how it works and how widely supported it would be, but cheers to Jeevan and whoever originally came up with this. BTW - stackoverflow answer editor needs this!
UPDATE
I believe this is better in that it doesn't try to manipulate the DOM at all, only prevents bubbling conditionally...
$.fn.scrollGuard2 = function() {
return this
.on( 'wheel', function ( e ) {
var $this = $(this);
if (e.originalEvent.deltaY < 0) {
/* scrolling up */
return ($this.scrollTop() > 0);
} else {
/* scrolling down */
return ($this.scrollTop() + $this.innerHeight() < $this[0].scrollHeight);
}
})
;
};
Works great in chrome and much simpler than other solutions... let me know how it fares elsewhere...
FIDDLE
You could use a mouseover event on the div to disable the body scrollbar and then a mouseout event to activate it again?
E.g. The HTML
<div onmouseover="disableBodyScroll();" onmouseout="enableBodyScroll();">
content
</div>
And then the javascript like so:
var body = document.getElementsByTagName('body')[0];
function disableBodyScroll() {
body.style.overflowY = 'hidden';
}
function enableBodyScroll() {
body.style.overflowY = 'auto';
}
As answered here, most modern browsers now support the overscroll-behavior: none; CSS property, that prevents scroll chaining. And that's it, just one line!
Here's a cross-browser way to do this on the Y axis, it works on desktop and mobile. Tested on OSX and iOS.
var scrollArea = this.querySelector(".scroll-area");
scrollArea.addEventListener("wheel", function() {
var scrollTop = this.scrollTop;
var maxScroll = this.scrollHeight - this.offsetHeight;
var deltaY = event.deltaY;
if ( (scrollTop >= maxScroll && deltaY > 0) || (scrollTop === 0 && deltaY < 0) ) {
event.preventDefault();
}
}, {passive:false});
scrollArea.addEventListener("touchstart", function(event) {
this.previousClientY = event.touches[0].clientY;
}, {passive:false});
scrollArea.addEventListener("touchmove", function(event) {
var scrollTop = this.scrollTop;
var maxScroll = this.scrollHeight - this.offsetHeight;
var currentClientY = event.touches[0].clientY;
var deltaY = this.previousClientY - currentClientY;
if ( (scrollTop >= maxScroll && deltaY > 0) || (scrollTop === 0 && deltaY < 0) ) {
event.preventDefault();
}
this.previousClientY = currentClientY;
}, {passive:false});
I wrote resolving for this issue
var div;
div = document.getElementsByClassName('selector')[0];
div.addEventListener('mousewheel', function(e) {
if (div.clientHeight + div.scrollTop + e.deltaY >= div.scrollHeight) {
e.preventDefault();
div.scrollTop = div.scrollHeight;
} else if (div.scrollTop + e.deltaY <= 0) {
e.preventDefault();
div.scrollTop = 0;
}
}, false);
If I understand your question correctly, then you want to prevent scrolling of the main content when the mouse is over a div (let's say a sidebar). For that, the sidebar may not be a child of the scrolling container of the main content (which was the browser window), to prevent the scroll event from bubbling up to its parent.
This possibly requires some markup changes in the following manner:
<div id="wrapper">
<div id="content">
</div>
</div>
<div id="sidebar">
</div>
See it's working in this sample fiddle and compare that with this sample fiddle which has a slightly different mouse leave behavior of the sidebar.
See also scroll only one particular div with browser's main scrollbar.
this disables the scrolling on the window if you enter the selector element.
works like charms.
elements = $(".selector");
elements.on('mouseenter', function() {
window.currentScrollTop = $(window).scrollTop();
window.currentScrollLeft = $(window).scrollTop();
$(window).on("scroll.prevent", function() {
$(window).scrollTop(window.currentScrollTop);
$(window).scrollLeft(window.currentScrollLeft);
});
});
elements.on('mouseleave', function() {
$(window).off("scroll.prevent");
});
You can inactivate the scrolling of the whole page by doing something like this but display the scrollbar!
<div onmouseover="document.body.style.overflow='hidden'; document.body.style.position='fixed';" onmouseout="document.body.style.overflow='auto'; document.body.style.position='relative';"></div>
$this.find('.scrollingDiv').on('mousewheel DOMMouseScroll', function (e) {
var delta = -e.originalEvent.wheelDelta || e.originalEvent.detail;
var scrollTop = this.scrollTop;
if((delta < 0 && scrollTop === 0) || (delta > 0 && this.scrollHeight - this.clientHeight - scrollTop === 0)) {
e.preventDefault();
}
});
Based on ceed's answer, here is a version that allows nesting scroll guarded elements. Only the element the mouse is over will scroll, and it scrolls quite smoothly. This version is also re-entrant. It can be used multiple times on the same element and will correctly remove and reinstall the handlers.
jQuery.fn.scrollGuard = function() {
this
.addClass('scroll-guarding')
.off('.scrollGuard').on('mouseenter.scrollGuard', function() {
var $g = $(this).parent().closest('.scroll-guarding');
$g = $g.length ? $g : $(window);
$g[0].myCst = $g.scrollTop();
$g[0].myCsl = $g.scrollLeft();
$g.off("scroll.prevent").on("scroll.prevent", function() {
$g.scrollTop($g[0].myCst);
$g.scrollLeft($g[0].myCsl);
});
})
.on('mouseleave.scrollGuard', function() {
var $g = $(this).parent().closest('.scroll-guarding');
$g = $g.length ? $g : $(window);
$g.off("scroll.prevent");
});
};
One easy way to use is to add a class, such as scroll-guard, to all the elements in the page that you allow scrolling on. Then use $('.scroll-guard').scrollGuard() to guard them.
If you apply an overflow: hidden style it should go away
edit: actually I read your question wrong, that will only hide the scroll bar but I don't think that's what you are looking for.
I couldn't get any of the answers to work in Chrome and Firefox, so I came up with this amalgamation:
$someElement.on('mousewheel DOMMouseScroll', scrollProtection);
function scrollProtection(event) {
var $this = $(this);
event = event.originalEvent;
var direction = (event.wheelDelta * -1) || (event.detail);
if (direction < 0) {
if ($this.scrollTop() <= 0) {
return false;
}
} else {
if ($this.scrollTop() + $this.innerHeight() >= $this[0].scrollHeight) {
return false;
}
}
}