I have created small menu order application, I have added 5 menu categories is Desserts, salad, thai noodles and more using horizontal scroll bar. if I click salad or any categories move left and right position working fine in chrome. I checking safari browser not working horizontal scroll. what I am missing. could you please check and let me know.
html:
<div class="menu" id="menu">
<div class="topnav sticky" id="stickyMenu"><span data-id="appetizers" id="nav1" class="cat-nav">Appetizers</span><span data-id="desserts" id="nav2" class="cat-nav">Desserts</span><span data-id="pizza--classic-11-inches-" id="nav3" class="cat-nav active">Pizza (Classic 11 inches)</span><span data-id="salad" id="nav4" class="cat-nav">Salad</span><span data-id="thai-noodles" id="nav5" class="cat-nav">Thai Noodles</span></div>
<!-- <div class="row filter">
<input type="text" id="gsearch" class="form-control gsearch" placeholder="Search within this Menu...">
</div> -->
</div>
js code:
$(document).on('click', ".topnav .cat-nav", function(e) {
$(".topnav .cat-nav").removeClass("active");
$(this).addClass("active");
var target = $(this).data("id");
$('html, body').animate({
scrollTop: ($("#"+target).offset().top - 50)
}, 500);
});
$(window).scroll(function() {
//get current sroll position
var scrollPosition = $(window).scrollTop();
//get the position of the containers
var s=["appetizers","desserts","pizza--classic-11-inches-","salad","thai-noodles"];
for (i=0; i<s.length; i++) {
if (scrollPosition >= ($("#"+s[i]).offset().top) - 190) {
$("#nav"+(i+1)).addClass("active");
$("#nav"+(i+1)).siblings().removeClass("active");
// $('.cat-nav').scrollLeft(myScrollPos);
var element = document.querySelector(".active");
element.scrollIntoView({behavior: "smooth" ,inline: "center"});
// $("#nav"+(i+1)).css({behavior: "smooth" ,inline: "center"});
}
}
});
Add overflow: auto to your sticky or topnav class:
.sticky {
overflow: none;
overflow-x: auto;
display: block;
}
This might work.
I have a page with a lot of text that requires some amount of scrolling. I was able to get a button, when clicked, to shoot to the top of the page I am on. But when at the top of the page, I am wanting this button to switch to another link that goes to the homepage.
Bonus Points: How would I change the text to also switch from "top" to "home"? I have not tackled this hurdle because I figured my issue with switching the href would correlate to this obstacle.
JS:
window.onscroll = function() { scrollFunction() };
function scrollFunction() {
document.getElementById("scroll-to-top-button").classList.toggle("show");
window.onclick = function(event) {
if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
window.location = "#top";
} else if(document.body.scrollTop = 0){
window.location.href = "https://homepage.html";
}
}
}
html:
<div class="fas fa-angle-up">top</div>
I have tried using window.scrollY instead of .scrollTop - but I have not touched scrolling elements prior to this. I am a little fuzzy with how to indicate if I have scrolled vs not scrolled. I do not know if my issue is because my if, else elements are not correct - or if it is something else?
Here's a small code snippet example to answer your question,
const anchor = document.querySelector('a')
window.addEventListener('scroll',() => {
if(window.scrollY > 100){
anchor.setAttribute('href', "#above")
anchor.innerText = "go above"
}else{
anchor.setAttribute('href', "#below")
anchor.innerText = "go below"
}
})
html{
scroll-behavior: smooth;
}
header{
background: white;
width: 100%
}
#above{
height:100vh;
width: 100%;
background: blue;
}
#below{
height: 100vh;
width: 100%;
background: green;
}
<header style="position:fixed">
go below
</header>
<section id="above"></section>
<section id="below"></section>
Here I am using setAttribute() to change the href attribute of anchor tag, and innerText to change that same anchor tag's text. I am using scrollY to check amount of window scrolled.
You could change the if(window.scrollY > 'change this value') according to your need
A lot of scroll jquery plugins work like this:
http://manos.malihu.gr/repository/page-scroll-to-id/demo/demo.html
and
http://alvarotrigo.com/fullPage/#firstPage
They scroll between sections.
Questions:
Are there also plugins or solution that scroll between .html pages:
up (when reached the top it scrolls to the previous page) and
down (when reached the bottom it scrolls to the next page)
Example but not working like I want:
http://vostrel.cz/so/9652944/page.html
It uses these codes:
(function($){
var jump=function(e)
{
if (e){
e.preventDefault();
var target = $(this).attr("href");
}else{
var target = location.hash;
}
$('html,body').animate(
{
scrollTop: $(target).offset().top
},1000,function()
{
location.hash = target;
});
}
$('html, body').hide()
$(document).ready(function()
{
$('a[href^=#]').bind("click", jump);
if (location.hash){
setTimeout(function(){
$('html, body').scrollTop(0).show()
jump()
}, 0);
}else{
$('html, body').show()
}
});
})(jQuery)
See it working here:
http://vostrel.cz/so/9652944/page.html
But it misses (A) when reached the top scroll on page 1 and (B) when reached the bottom scroll on page 2 and (C) when scrolling up scroll upwards, when scrolling down scroll downwards. The example always scrolls in the same direction and that's also a problem.
The above codes are just an example. Maybe someone has much better codes. Main intention is to make my idea clear. Hope this illustrates what I want to achieve. Thanks in advance for any help.
In horizontal scroll (swipe) direction (or it could be changed in vertical direction if you like) it could be done this way:
HTML:
<div data-role="page" id="city" class="demo-page" data-dom-cache="true" data-theme="a" data-prev="prevCity" data-next="nextCity" data-url="city">
<!-- "city", "prevCity" and "nextCity" are used as placeholders and contain the name of the applicable city in our demo files. -->
<div data-role="header" data-position="fixed" data-fullscreen="true" data-id="hdr" data-tap-toggle="false">
<h1>City</h1>
Back
</div><!-- /header -->
<div data-role="content">
<div id="trivia-city" class="trivia ui-content" data-role="popup" data-position-to="window" data-tolerance="50,30,30,30" data-theme="d">
Close
<p>Here some text.</p>
</div><!-- /popup -->
</div><!-- /content -->
<div data-role="footer" data-position="fixed" data-fullscreen="true" data-id="ftr" data-tap-toggle="false">
<div data-role="controlgroup" class="control ui-btn-left" data-type="horizontal" data-mini="true">
Previous
Next
</div>
Trivia
</div><!-- /footer -->
JS:
$( document ).on( "pageinit", "[data-role='page'].demo-page", function() {
var page = "#" + $( this ).attr( "id" ),
// Get the filename of the next page that we stored in the data-next attribute
next = $( this ).jqmData( "next" ),
// Get the filename of the previous page that we stored in the data-prev attribute
prev = $( this ).jqmData( "prev" );
// Check if we did set the data-next attribute
if ( next ) {
// Prefetch the next page
$.mobile.loadPage( next + ".html" );
// Navigate to next page on swipe left
$( document ).on( "swipeleft", page, function() {
$.mobile.changePage( next + ".html", { transition: "slide" });
});
// Navigate to next page when the "next" button is clicked
$( ".control .next", page ).on( "click", function() {
$.mobile.changePage( next + ".html", { transition: "slide" } );
});
}
// Disable the "next" button if there is no next page
else {
$( ".control .next", page ).addClass( "ui-disabled" );
}
// The same for the previous page (we set data-dom-cache="true" so there is no need to prefetch)
if ( prev ) {
$( document ).on( "swiperight", page, function() {
$.mobile.changePage( prev + ".html", { transition: "slide", reverse: true } );
});
$( ".control .prev", page ).on( "click", function() {
$.mobile.changePage( prev + ".html", { transition: "slide", reverse: true } );
});
}
else {
$( ".control .prev", page ).addClass( "ui-disabled" );
}
});
CSS:
/* Set the background image sources */
#newyork { background-image: url(../../_assets/img/newyork.jpg); }
#buenosaires { background-image: url(../../_assets/img/buenosaires.jpg); }
#paris { background-image: url(../../_assets/img/paris.jpg); }
#capetown { background-image: url(../../_assets/img/capetown.jpg); }
#seoul { background-image: url(../../_assets/img/seoul.jpg); }
#sydney { background-image: url(../../_assets/img/sydney.jpg); }
/* Background settings */
.demo-page {
background-size: cover;
background-position: center center;
background-repeat: no-repeat;
}
/* Transparent footer */
.demo-page .ui-footer {
background: none;
border: none;
bottom: 0;
}
/* The footer won't have a height because there are only two absolute positioned elements in it.
So we position the buttons from the bottom. */
.control.ui-btn-left, .trivia-btn.ui-btn-right {
top: auto;
bottom: 7px;
margin: 0;
}
/* Custom styling for the trivia source */
small {
font-size: .75em;
color: #666;
}
/* Prevent text selection while swiping with mouse */
.demo-page .ui-header, .ui-title, .control .ui-btn, .trivia-btn {
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
-o-user-select: none;
user-select: none;
}
DEMO:
http://demos.jquerymobile.com/1.3.2/examples/swipe/newyork.html
DOCUMENTATION:
http://demos.jquerymobile.com/1.3.2/examples/swipe/swipe-page.html
I currently have a number of div tags that can be seen below that are each the height of the viewport.
<!-- .current represents the div the user is currently viewing -->
<div class="full-height current" id="id1">
<div class="container">
</div>
</div>
<div class="full-height" id="id2">
<div class="container">
</div>
</div>
<div class="full-height" id="id3">
<div class="container">
</div>
</div>
<div class="full-height" id="id4">
<div class="container">
</div>
</div>
<div class="full-height" id="id5">
<div class="container">
</div>
</div>
I am attempting to implement a feature where upon a user scrolling, the window will scroll to the next div tag, always having only one div in view at a time. The way I implemented it works great, except for the fact that the animation triggers the scroll event again, resulting in an endless loop of the page scrolling once the user scrolls at all. I attempted to fix this by having a variable that will stop the event from triggering if the animation is in progress, but it does not seem to work. I am aware that I didn't do it for the scroll up, but I just wanted to see if it worked for the down first.
$(window).scroll(function(event) {
var scrollTop = $(this).scrollTop();
// If user scrolls down
if ((scrollTop > lastScrollTop) && $(".current").next("div").length > 0) {
if (animating == false) {
console.log("down");
$(".current").next("div").addClass("current");
$(".current").first().removeClass("current");
animating = true;
$("html, body").animate({
scrollTop: $(".current").offset().top
}, 1000, function() {animating = false});
}
// If user scrolls up
} else {
if ($(".current").prev("div").length > 0) {
console.log("up");
$(".current").prev("div").addClass("current");
$(".current").last().removeClass("current");
$("html, body").animate({
scrollTop: $(".current").offset().top
}, 1000);
}
}
lastScrollTop = scrollTop;
});
CSS included just in case. The 100vh - 111px is due to a fixed navbar at the top that is 111px high
/* Makes the element take up the entire height of the screen */
.full-height{
height: -o-calc(100vh - 111px); /* opera */
height: -webkit-calc(100vh - 111px); /* google, safari */
height: -moz-calc(100vh - 111px); /* firefox */
}
#id1 {
background-color: red;
}
#id2 {
background-color: blue;
}
#id3 {
background-color: yellow;
}
#id4 {
background-color: green;
}
#id5 {
background-color: purple;
}
If anyone could give me any ideas for fixing my problem, that would be great.
You'll want to stop the event and preventDefault. Here is some code from a current landing page:
$(document).ready(function () {
$('a.page-scroll').on('click', function(event) {
var link = $(this);
$('html, body').stop().animate({
scrollTop: $(link.attr('href')).offset().top - 50
}, 500);
event.preventDefault();
});
$('body').scrollspy({
target: '.navbar-fixed-top',
offset: 80
});
});
It uses bootstrap scrollspy so just ignore that. But notice that it stops any scroll animation that could be running and then also calls event.preventDefault() to stop the scroll event from bubbling and thus becoming recursive.
EDIT:
O.k. so I've a better look and the basic problem re: infinite scrolling is the code doesn't check if the scrollTop is already at 'where it needs to be'. You need an additional check to short circuit the scroll:
if (animating == false) {
if ($(this).scrollTop() == lastScrollTop) return;
if (($(this).scrollTop() > lastScrollTop) && $(".current").next("div")) {
console.log("down");
$(".current").next("div").addClass("current");
$(".current").first().removeClass("current");
animating = true;
$("html, body").stop().animate({
scrollTop: $(".current").offset().top
}, 1000,
function () { lastScrollTop = $(this).scrollTop(); animating = false; });
// If user scrolls up
} else {
if ($(".current").prev("div").length > 0) {
console.log("up");
$(".current").prev("div").addClass("current");
$(".current").last().removeClass("current");
$("html, body").stop().animate({
scrollTop: $(".current").offset().top
}, 1000, function () { lastScrollTop = $(this).scrollTop(); animating = false; });
}
}
}
Otherwise as it stands it will always either scroll up or down and never settle. That said with that "working" it's a terrible user experience. It will jump about since your scroll to code will fight the user on current scrollTop if they keep scrolling. i.e. your code will make it jump back to a previous position.
Try defining scroll event handler as named function ; defining lastScrollTop outside of scroll handler ; substituting .one() for .on() to allow animation to complete before re-attaching scroll event ; use .promise() which should be called at most once to avoid .animate() complete callback being called twice with selector "html, body" ; substituting single if to check for next or previous element .length and .animate() call for multiple if..else conditions and statements, animation function calls ; re-attach scroll event at .then() following animation completion .promise()
var lastScrollTop = 0;
function scroller(event) {
var scrollTop = $(this).scrollTop();
var direction = scrollTop > lastScrollTop ? "next" : "prev";
var el = $(".current")[direction](".full-height");
console.log(direction === "next" ? "down" : "up");
if (el.is("*")) {
$("html, body").animate({
scrollTop: el.offset().top
}, 1000).promise().then(function() {
console.log(this)
lastScrollTop = $(window).scrollTop();
$(".current")
.removeClass("current")[direction]("div")
.addClass("current")
setTimeout(function() {
$(window).one("scroll", scroller)
})
});
} else {
lastScrollTop = scrollTop;
$(window).one("scroll", scroller)
}
}
$(window).one("scroll", scroller);
/* Makes the element take up the entire height of the screen */
.full-height {
height: -o-calc(100vh - 111px);
/* opera */
height: -webkit-calc(100vh - 111px);
/* google, safari */
height: -moz-calc(100vh - 111px);
/* firefox */
}
#id1 {
background-color: red;
}
#id2 {
background-color: blue;
}
#id3 {
background-color: yellow;
}
#id4 {
background-color: green;
}
#id5 {
background-color: purple;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<!-- .current represents the div the user is currently viewing -->
<div class="full-height current" id="id1">
<div class="container">
</div>
</div>
<div class="full-height" id="id2">
<div class="container">
</div>
</div>
<div class="full-height" id="id3">
<div class="container">
</div>
</div>
<div class="full-height" id="id4">
<div class="container">
</div>
</div>
<div class="full-height" id="id5">
<div class="container">
</div>
</div>
If you define height 100vh ,scroll event wont trigger
I have a scrolled div and I want to have an event when I click on it, it will force this div to scroll to view an element inside.
I wrote its JavasSript like this:
document.getElementById(chr).scrollIntoView(true);
but this scrolls all the page while scrolling the div itself.
How to fix that?
I want to say it like this:
MyContainerDiv.getElementById(chr).scrollIntoView(true);
You need to get the top offset of the element you'd like to scroll into view, relative to its parent (the scrolling div container):
var myElement = document.getElementById('element_within_div');
var topPos = myElement.offsetTop;
The variable topPos is now set to the distance between the top of the scrolling div and the element you wish to have visible (in pixels).
Now we tell the div to scroll to that position using scrollTop:
document.getElementById('scrolling_div').scrollTop = topPos;
If you're using the prototype JS framework, you'd do the same thing like this:
var posArray = $('element_within_div').positionedOffset();
$('scrolling_div').scrollTop = posArray[1];
Again, this will scroll the div so that the element you wish to see is exactly at the top (or if that's not possible, scrolled as far down as it can so it's visible).
You would have to find the position of the element in the DIV you want to scroll to, and set the scrollTop property.
divElem.scrollTop = 0;
Update:
Sample code to move up or down
function move_up() {
document.getElementById('divElem').scrollTop += 10;
}
function move_down() {
document.getElementById('divElem').scrollTop -= 10;
}
Method 1 - Smooth scrolling to an element inside an element
var box = document.querySelector('.box'),
targetElm = document.querySelector('.boxChild'); // <-- Scroll to here within ".box"
document.querySelector('button').addEventListener('click', function(){
scrollToElm( box, targetElm , 600 );
});
/////////////
function scrollToElm(container, elm, duration){
var pos = getRelativePos(elm);
scrollTo( container, pos.top , 2); // duration in seconds
}
function getRelativePos(elm){
var pPos = elm.parentNode.getBoundingClientRect(), // parent pos
cPos = elm.getBoundingClientRect(), // target pos
pos = {};
pos.top = cPos.top - pPos.top + elm.parentNode.scrollTop,
pos.right = cPos.right - pPos.right,
pos.bottom = cPos.bottom - pPos.bottom,
pos.left = cPos.left - pPos.left;
return pos;
}
function scrollTo(element, to, duration, onDone) {
var start = element.scrollTop,
change = to - start,
startTime = performance.now(),
val, now, elapsed, t;
function animateScroll(){
now = performance.now();
elapsed = (now - startTime)/1000;
t = (elapsed/duration);
element.scrollTop = start + change * easeInOutQuad(t);
if( t < 1 )
window.requestAnimationFrame(animateScroll);
else
onDone && onDone();
};
animateScroll();
}
function easeInOutQuad(t){ return t<.5 ? 2*t*t : -1+(4-2*t)*t };
.box{ width:80%; border:2px dashed; height:180px; overflow:auto; }
.boxChild{
margin:600px 0 300px;
width: 40px;
height:40px;
background:green;
}
<button>Scroll to element</button>
<div class='box'>
<div class='boxChild'></div>
</div>
Method 2 - Using Element.scrollIntoView:
Note that browser support isn't great for this one
var targetElm = document.querySelector('.boxChild'), // reference to scroll target
button = document.querySelector('button'); // button that triggers the scroll
// bind "click" event to a button
button.addEventListener('click', function(){
targetElm.scrollIntoView()
})
.box {
width: 80%;
border: 2px dashed;
height: 180px;
overflow: auto;
scroll-behavior: smooth; /* <-- for smooth scroll */
}
.boxChild {
margin: 600px 0 300px;
width: 40px;
height: 40px;
background: green;
}
<button>Scroll to element</button>
<div class='box'>
<div class='boxChild'></div>
</div>
Method 3 - Using CSS scroll-behavior:
.box {
width: 80%;
border: 2px dashed;
height: 180px;
overflow-y: scroll;
scroll-behavior: smooth; /* <--- */
}
#boxChild {
margin: 600px 0 300px;
width: 40px;
height: 40px;
background: green;
}
<a href='#boxChild'>Scroll to element</a>
<div class='box'>
<div id='boxChild'></div>
</div>
Native JS, Cross Browser, Smooth Scroll (Update 2020)
Setting ScrollTop does give the desired result but the scroll is very abrupt. Using jquery to have smooth scroll was not an option. So here's a native way to get the job done that supports all major browsers. Reference - caniuse
// get the "Div" inside which you wish to scroll (i.e. the container element)
const El = document.getElementById('xyz');
// Lets say you wish to scroll by 100px,
El.scrollTo({top: 100, behavior: 'smooth'});
// If you wish to scroll until the end of the container
El.scrollTo({top: El.scrollHeight, behavior: 'smooth'});
That's it!
And here's a working snippet for the doubtful -
document.getElementById('btn').addEventListener('click', e => {
e.preventDefault();
// smooth scroll
document.getElementById('container').scrollTo({top: 175, behavior: 'smooth'});
});
/* just some styling for you to ignore */
.scrollContainer {
overflow-y: auto;
max-height: 100px;
position: relative;
border: 1px solid red;
width: 120px;
}
body {
padding: 10px;
}
.box {
margin: 5px;
background-color: yellow;
height: 25px;
display: flex;
align-items: center;
justify-content: center;
}
#goose {
background-color: lime;
}
<!-- Dummy html to be ignored -->
<div id="container" class="scrollContainer">
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div id="goose" class="box">goose</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
</div>
<button id="btn">goose</button>
Update: As you can perceive in the comments, it seems that Element.scrollTo() is not supported in IE11. So if you don't care about IE11 (you really shouldn't, Microsoft is retiring IE11 in June 2022), feel free to use this in all your projects. Note that support exists for Edge! So you're not really leaving your Edge/Windows users behind ;)
Reference
To scroll an element into view of a div, only if needed, you can use this scrollIfNeeded function:
function scrollIfNeeded(element, container) {
if (element.offsetTop < container.scrollTop) {
container.scrollTop = element.offsetTop;
} else {
const offsetBottom = element.offsetTop + element.offsetHeight;
const scrollBottom = container.scrollTop + container.offsetHeight;
if (offsetBottom > scrollBottom) {
container.scrollTop = offsetBottom - container.offsetHeight;
}
}
}
document.getElementById('btn').addEventListener('click', ev => {
ev.preventDefault();
scrollIfNeeded(document.getElementById('goose'), document.getElementById('container'));
});
.scrollContainer {
overflow-y: auto;
max-height: 100px;
position: relative;
border: 1px solid red;
width: 120px;
}
body {
padding: 10px;
}
.box {
margin: 5px;
background-color: yellow;
height: 25px;
display: flex;
align-items: center;
justify-content: center;
}
#goose {
background-color: lime;
}
<div id="container" class="scrollContainer">
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div id="goose" class="box">goose</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
<div class="box">duck</div>
</div>
<button id="btn">scroll to goose</button>
Code should be:
var divElem = document.getElementById('scrolling_div');
var chElem = document.getElementById('element_within_div');
var topPos = divElem.offsetTop;
divElem.scrollTop = topPos - chElem.offsetTop;
You want to scroll the difference between child top position and div's top position.
Get access to child elements using:
var divElem = document.getElementById('scrolling_div');
var numChildren = divElem.childNodes.length;
and so on....
If you are using jQuery, you could scroll with an animation using the following:
$(MyContainerDiv).animate({scrollTop: $(MyContainerDiv).scrollTop() + ($('element_within_div').offset().top - $(MyContainerDiv).offset().top)});
The animation is optional: you could also take the scrollTop value calculated above and put it directly in the container's scrollTop property.
We can resolve this problem without using JQuery and other libs.
I wrote following code for this purpose:
You have similar structure ->
<div class="parent">
<div class="child-one">
</div>
<div class="child-two">
</div>
</div>
JS:
scrollToElement() {
var parentElement = document.querySelector('.parent');
var childElement = document.querySelector('.child-two');
parentElement.scrollTop = childElement.offsetTop - parentElement.offsetTop;
}
We can easily rewrite this method for passing parent and child as an arguments
Another example of using jQuery and animate.
var container = $('#container');
var element = $('#element');
container.animate({
scrollTop: container.scrollTop = container.scrollTop() + element.offset().top - container.offset().top
}, {
duration: 1000,
specialEasing: {
width: 'linear',
height: 'easeOutBounce'
},
complete: function (e) {
console.log("animation completed");
}
});
None of other answer fixed my issue.
I played around with scrollIntoView arguments and managed to found a solution. Setting inline to start and block to nearest prevents parent element (or entire page) to scroll:
document.getElementById(chr).scrollIntoView({
behavior: 'smooth',
block: 'nearest',
inline: 'start'
});
There are two facts :
1) Component scrollIntoView is not supported by safari.
2) JS framework jQuery can do the job like this:
parent = 'some parent div has css position==="fixed"' || 'html, body';
$(parent).animate({scrollTop: $(child).offset().top}, duration)
Here's a simple pure JavaScript solution that works for a target Number (value for scrollTop), target DOM element, or some special String cases:
/**
* target - target to scroll to (DOM element, scrollTop Number, 'top', or 'bottom'
* containerEl - DOM element for the container with scrollbars
*/
var scrollToTarget = function(target, containerEl) {
// Moved up here for readability:
var isElement = target && target.nodeType === 1,
isNumber = Object.prototype.toString.call(target) === '[object Number]';
if (isElement) {
containerEl.scrollTop = target.offsetTop;
} else if (isNumber) {
containerEl.scrollTop = target;
} else if (target === 'bottom') {
containerEl.scrollTop = containerEl.scrollHeight - containerEl.offsetHeight;
} else if (target === 'top') {
containerEl.scrollTop = 0;
}
};
And here are some examples of usage:
// Scroll to the top
var scrollableDiv = document.getElementById('scrollable_div');
scrollToTarget('top', scrollableDiv);
or
// Scroll to 200px from the top
var scrollableDiv = document.getElementById('scrollable_div');
scrollToTarget(200, scrollableDiv);
or
// Scroll to targetElement
var scrollableDiv = document.getElementById('scrollable_div');
var targetElement= document.getElementById('target_element');
scrollToTarget(targetElement, scrollableDiv);
given you have a div element you need to scroll inside, try this piece of code
document.querySelector('div').scroll(x,y)
this works with me inside a div with a scroll, this should work with you in case you pointed the mouse over this element and then tried to scroll down or up. If it manually works, it should work too
User Animated Scrolling
Here's an example of how to programmatically scroll a <div> horizontally, without JQuery. To scroll vertically, you would replace JavaScript's writes to scrollLeft with scrollTop, instead.
JSFiddle
https://jsfiddle.net/fNPvf/38536/
HTML
<!-- Left Button. -->
<div style="float:left;">
<!-- (1) Whilst it's pressed, increment the scroll. When we release, clear the timer to stop recursive scroll calls. -->
<input type="button" value="«" style="height: 100px;" onmousedown="scroll('scroller',3, 10);" onmouseup="clearTimeout(TIMER_SCROLL);"/>
</div>
<!-- Contents to scroll. -->
<div id="scroller" style="float: left; width: 100px; height: 100px; overflow: hidden;">
<!-- <3 -->
<img src="https://cdn.sstatic.net/Sites/stackoverflow/company/img/logos/so/so-logo.png?v=9c558ec15d8a" alt="image large" style="height: 100px" />
</div>
<!-- Right Button. -->
<div style="float:left;">
<!-- As (1). (Use a negative value of 'd' to decrease the scroll.) -->
<input type="button" value="»" style="height: 100px;" onmousedown="scroll('scroller',-3, 10);" onmouseup="clearTimeout(TIMER_SCROLL);"/>
</div>
JavaScript
// Declare the Shared Timer.
var TIMER_SCROLL;
/**
Scroll function.
#param id Unique id of element to scroll.
#param d Amount of pixels to scroll per sleep.
#param del Size of the sleep (ms).*/
function scroll(id, d, del){
// Scroll the element.
document.getElementById(id).scrollLeft += d;
// Perform a delay before recursing this function again.
TIMER_SCROLL = setTimeout("scroll('"+id+"',"+d+", "+del+");", del);
}
Credit to Dux.
Auto Animated Scrolling
In addition, here are functions for scrolling a <div> fully to the left and right. The only thing we change here is we make a check to see if the full extension of the scroll has been utilised before making a recursive call to scroll again.
JSFiddle
https://jsfiddle.net/0nLc2fhh/1/
HTML
<!-- Left Button. -->
<div style="float:left;">
<!-- (1) Whilst it's pressed, increment the scroll. When we release, clear the timer to stop recursive scroll calls. -->
<input type="button" value="«" style="height: 100px;" onclick="scrollFullyLeft('scroller',3, 10);"/>
</div>
<!-- Contents to scroll. -->
<div id="scroller" style="float: left; width: 100px; height: 100px; overflow: hidden;">
<!-- <3 -->
<img src="https://cdn.sstatic.net/Sites/stackoverflow/company/img/logos/so/so-logo.png?v=9c558ec15d8a" alt="image large" style="height: 100px" />
</div>
<!-- Right Button. -->
<div style="float:left;">
<!-- As (1). (Use a negative value of 'd' to decrease the scroll.) -->
<input type="button" value="»" style="height: 100px;" onclick="scrollFullyRight('scroller',3, 10);"/>
</div>
JavaScript
// Declare the Shared Timer.
var TIMER_SCROLL;
/**
Scroll fully left function; completely scrolls a <div> to the left, as far as it will go.
#param id Unique id of element to scroll.
#param d Amount of pixels to scroll per sleep.
#param del Size of the sleep (ms).*/
function scrollFullyLeft(id, d, del){
// Fetch the element.
var el = document.getElementById(id);
// Scroll the element.
el.scrollLeft += d;
// Have we not finished scrolling yet?
if(el.scrollLeft < (el.scrollWidth - el.clientWidth)) {
TIMER_SCROLL = setTimeout("scrollFullyLeft('"+id+"',"+d+", "+del+");", del);
}
}
/**
Scroll fully right function; completely scrolls a <div> to the right, as far as it will go.
#param id Unique id of element to scroll.
#param d Amount of pixels to scroll per sleep.
#param del Size of the sleep (ms).*/
function scrollFullyRight(id, d, del){
// Fetch the element.
var el = document.getElementById(id);
// Scroll the element.
el.scrollLeft -= d;
// Have we not finished scrolling yet?
if(el.scrollLeft > 0) {
TIMER_SCROLL = setTimeout("scrollFullyRight('"+id+"',"+d+", "+del+");", del);
}
}
This is what has finally served me
/** Set parent scroll to show element
* #param element {object} The HTML object to show
* #param parent {object} The HTML object where the element is shown */
var scrollToView = function(element, parent) {
//Algorithm: Accumulate the height of the previous elements and add half the height of the parent
var offsetAccumulator = 0;
parent = $(parent);
parent.children().each(function() {
if(this == element) {
return false; //brake each loop
}
offsetAccumulator += $(this).innerHeight();
});
parent.scrollTop(offsetAccumulator - parent.innerHeight()/2);
}
I needed to scroll a dynamically loading element on a page so my solution was a little more involved.
This will work on static elements that are not lazy loading data and data being dynamically loaded.
const smoothScrollElement = async (selector: string, scrollBy = 12, prevCurrPos = 0) => {
const wait = (timeout: number) => new Promise(resolve => setTimeout(resolve, timeout));
const el = document.querySelector(selector) as HTMLElement;
let positionToScrollTo = el.scrollHeight;
let currentPosition = Math.floor(el.scrollTop) || 0;
let pageYOffset = (el.clientHeight + currentPosition);
if (positionToScrollTo == pageYOffset) {
await wait(1000);
}
if ((prevCurrPos > 0 && currentPosition <= prevCurrPos) !== true) {
setTimeout(async () => {
el.scrollBy(0, scrollBy);
await smoothScrollElement(selector, scrollBy, currentPosition);
}, scrollBy);
}
};
browser does scrolling automatically to an element that gets focus, so what you can also do it to wrap the element that you need to be scrolled to into <a>...</a> and then when you need scroll just set the focus on that a