So basically I'm developing a website where the scroll event's default is prevented and instead each scroll takes you down or up to the next "section". This works really well on PC and some phones but on iOS the scrolling just becomes this jumbled up mess and quite frankly I'm out of ideas.
The scroll API for mobile I'm using is jquery touchSwipe
https://github.com/mattbryson/TouchSwipe-Jquery-Plugin
And the following code is the function that is supposed to do all the work.
if( /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ) {
$(window).swipe({
swipe:function(event, direction, distance, duration, fingerCount, fingerData) {
if (scrolling == false && direction === "down") {
scrolling = true;
scrollSection = Math.round($(window).scrollTop()/window.innerHeight);
scrollTo_(event,sections[scrollSection-1]);
setTimeout(function() {
scrolling = false;
}, 1000);
}
else if (scrolling == false && direction === "up") {
scrolling = true;
scrollSection = Math.round($(window).scrollTop()/window.innerHeight);
scrollTo_(event,sections[scrollSection+1]);
setTimeout(function() {
scrolling = false;
}, 1000);
}
}
});
}
If you have any questions by all means let me know and I will update this question.
Have you tried with this?
In my web app last days I've worked on Jquery UI slider, that's didn't worked for mobiles, so after attaching that it get's worked.
Is there a way to get the mouse wheel events (not talking about scroll events) in jQuery?
$(document).ready(function(){
$('#foo').bind('mousewheel', function(e){
if(e.originalEvent.wheelDelta /120 > 0) {
console.log('scrolling up !');
}
else{
console.log('scrolling down !');
}
});
});
Binding to both mousewheel and DOMMouseScroll ended up working really well for me:
$(window).bind('mousewheel DOMMouseScroll', function(event){
if (event.originalEvent.wheelDelta > 0 || event.originalEvent.detail < 0) {
// scroll up
}
else {
// scroll down
}
});
This method is working in IE9+, Chrome 33, and Firefox 27.
Edit - Mar 2016
I decided to revisit this issue since it's been a while. The MDN page for the scroll event has a great way of retrieving the scroll position that makes use of requestAnimationFrame, which is highly preferable to my previous detection method. I modified their code to provide better compatibility in addition to scroll direction and position:
(function() {
var supportOffset = window.pageYOffset !== undefined,
lastKnownPos = 0,
ticking = false,
scrollDir,
currYPos;
function doSomething(scrollPos, scrollDir) {
// Your code goes here...
console.log('scroll pos: ' + scrollPos + ' | scroll dir: ' + scrollDir);
}
window.addEventListener('wheel', function(e) {
currYPos = supportOffset ? window.pageYOffset : document.body.scrollTop;
scrollDir = lastKnownPos > currYPos ? 'up' : 'down';
lastKnownPos = currYPos;
if (!ticking) {
window.requestAnimationFrame(function() {
doSomething(lastKnownPos, scrollDir);
ticking = false;
});
}
ticking = true;
});
})();
See the Pen Vanilla JS Scroll Tracking by Jesse Dupuy (#blindside85) on CodePen.
This code is currently working in Chrome v50, Firefox v44, Safari v9, and IE9+
References:
https://developer.mozilla.org/en-US/docs/Web/Events/scroll
https://developer.mozilla.org/en-US/docs/Web/Events/wheel
As of now in 2017, you can just write
$(window).on('wheel', function(event){
// deltaY obviously records vertical scroll, deltaX and deltaZ exist too.
// this condition makes sure it's vertical scrolling that happened
if(event.originalEvent.deltaY !== 0){
if(event.originalEvent.deltaY < 0){
// wheeled up
}
else {
// wheeled down
}
}
});
Works with current Firefox 51, Chrome 56, IE9+
There's a plugin that detects up/down mouse wheel and velocity over a region.
Answers talking about "mousewheel" event are refering to a deprecated event. The standard event is simply "wheel". See https://developer.mozilla.org/en-US/docs/Web/Reference/Events/wheel
This worked for me:)
//Firefox
$('#elem').bind('DOMMouseScroll', function(e){
if(e.originalEvent.detail > 0) {
//scroll down
console.log('Down');
}else {
//scroll up
console.log('Up');
}
//prevent page fom scrolling
return false;
});
//IE, Opera, Safari
$('#elem').bind('mousewheel', function(e){
if(e.originalEvent.wheelDelta < 0) {
//scroll down
console.log('Down');
}else {
//scroll up
console.log('Up');
}
//prevent page fom scrolling
return false;
});
from stackoverflow
Here is a vanilla solution. Can be used in jQuery if the event passed to the function is event.originalEvent which jQuery makes available as property of the jQuery event. Or if inside the callback function under we add before first line: event = event.originalEvent;.
This code normalizes the wheel speed/amount and is positive for what would be a forward scroll in a typical mouse, and negative in a backward mouse wheel movement.
Demo: http://jsfiddle.net/BXhzD/
var wheel = document.getElementById('wheel');
function report(ammout) {
wheel.innerHTML = 'wheel ammout: ' + ammout;
}
function callback(event) {
var normalized;
if (event.wheelDelta) {
normalized = (event.wheelDelta % 120 - 0) == -0 ? event.wheelDelta / 120 : event.wheelDelta / 12;
} else {
var rawAmmount = event.deltaY ? event.deltaY : event.detail;
normalized = -(rawAmmount % 3 ? rawAmmount * 10 : rawAmmount / 3);
}
report(normalized);
}
var event = 'onwheel' in document ? 'wheel' : 'onmousewheel' in document ? 'mousewheel' : 'DOMMouseScroll';
window.addEventListener(event, callback);
There is also a plugin for jQuery, which is more verbose in the code and some extra sugar: https://github.com/brandonaaron/jquery-mousewheel
This is working in each IE, Firefox and Chrome's latest versions.
$(document).ready(function(){
$('#whole').bind('DOMMouseScroll mousewheel', function(e){
if(e.originalEvent.wheelDelta > 0 || e.originalEvent.detail < 0) {
alert("up");
}
else{
alert("down");
}
});
});
I was stuck in this issue today and found this code is working fine for me
$('#content').on('mousewheel', function(event) {
//console.log(event.deltaX, event.deltaY, event.deltaFactor);
if(event.deltaY > 0) {
console.log('scroll up');
} else {
console.log('scroll down');
}
});
use this code
knob.bind('mousewheel', function(e){
if(e.originalEvent.wheelDelta < 0) {
moveKnob('down');
} else {
moveKnob('up');
}
return false;
});
The plugin that #DarinDimitrov posted, jquery-mousewheel, is broken with jQuery 3+. It would be more advisable to use jquery-wheel which works with jQuery 3+.
If you don't want to go the jQuery route, MDN highly cautions using the mousewheel event as it's nonstandard and unsupported in many places. It instead says that you should use the wheel event as you get much more specificity over exactly what the values you're getting mean. It's supported by most major browsers.
my combination looks like this. it fades out and fades in on each scroll down/up. otherwise you have to scroll up to the header, for fading the header in.
var header = $("#header");
$('#content-container').bind('mousewheel', function(e){
if(e.originalEvent.wheelDelta > 0) {
if (header.data('faded')) {
header.data('faded', 0).stop(true).fadeTo(800, 1);
}
}
else{
if (!header.data('faded')) header.data('faded', 1).stop(true).fadeTo(800, 0);
}
});
the above one is not optimized for touch/mobile, I think this one does it better for all mobile:
var iScrollPos = 0;
var header = $("#header");
$('#content-container').scroll(function () {
var iCurScrollPos = $(this).scrollTop();
if (iCurScrollPos > iScrollPos) {
if (!header.data('faded')) header.data('faded', 1).stop(true).fadeTo(800, 0);
} else {
//Scrolling Up
if (header.data('faded')) {
header.data('faded', 0).stop(true).fadeTo(800, 1);
}
}
iScrollPos = iCurScrollPos;
});
If using mentioned jquery mousewheel plugin, then what about to use the 2nd argument of event handler function - delta:
$('#my-element').on('mousewheel', function(event, delta) {
if(delta > 0) {
console.log('scroll up');
}
else {
console.log('scroll down');
}
});
I think many key things are a bit all over the place and I needed to read all the answers to make my code work as I wanted, so I will post my findings in just one place:
You should use "wheel" event over the other deprecated or browser specific events.
Many people here is getting something wrong: the opposite of x>0 is x<=0 and the opposite of x<0 is x>=0, many of the answers in here will trigger scrolling down or up incorrectly when x=0 (horizontal scrolling).
Someone was asking how to put sensitivity on it, for this you can use setTimeout() with like 50 ms of delay that changes some helper flag isWaiting=false and you protect yourself with if(isWaiting) then don't do anything. When it fires you manually change isWaiting=true and just below this line you start the setTimeout again who will later change isWaiting=false after 50 ms.
I got same problem recently where
$(window).mousewheel was returning undefined
What I did was $(window).on('mousewheel', function() {});
Further to process it I am using:
function (event) {
var direction = null,
key;
if (event.type === 'mousewheel') {
if (yourFunctionForGetMouseWheelDirection(event) > 0) {
direction = 'up';
} else {
direction = 'down';
}
}
}
what I'm trying to do
I have dropdown-menus that open on hover and the parent menus have their own landing page link. we're not willing to sacrifice this behavior, but if obviously creates problem for large touch enabled devices. So, I'm detecting touch devices with jquery, and disabling the parent menu click on devices larger than 990px wide. devices below 990px is considered as mobile view and it switches to toggle. This switch between the toggle and the desktop view is expected to continue on screen rotation too.
what is happening
the menu link is disabled on first load and works as expected. Then I rotate the screen (from landscape to portrait) and see the mobile menu as expected and navigate to another page. once the page loads, I rotate it again (from portrait to landscape) and the desktop view is visible, but the parent links are clickable now!
I want to prevent this click event on second rotation too. HTML is standard bootstrap 3 navigation code and my js is like this:
function isTouchDevice() {
return true == ("ontouchstart" in window || window.DocumentTouch && document instanceof DocumentTouch);
}
$(document).ready(function () {
$(window).resize(function () {
var o = $(window).innerWidth();
function isTouchDevice() {
return true == ("ontouchstart" in window || window.DocumentTouch && document instanceof DocumentTouch);
}
if ((isTouchDevice() === true) && (o >= 990)) {
$('.navbar .dropdown > a ').each(function () {
$(this).on("click", function(){
return false
})
})
alert('oi!!')
}
else {
$('.navbar .dropdown > a ').each(function () {
$(this).on("click", function(){
location.href = this.href;
})
});
alert ("bad!") //for debugging purpose, not really needed
}
}).resize();
//the mobile menu clicks events
$('#menu .dropdown > a ').click(function () {
location.href = this.href;
});
});
PS this is a website, not an android app. I have found answers that answer this type of questions for android apps.
Update the jsfiddle for my code
I solved it myself. Turns out, the condition for width checking was creating the problem and in my case, unnecessary, because bootstrap is already hiding the menu in smaller screens and I was targeting touch enabled desktop devices anyway. so I took off && (o >= 990) from the if condition and it is working as expected.
full js is below (in case anyone needs it). I used the timer to prevent the event from firing before the resize, but it will probably work without the timer too. :
$(document).ready(function () {
var resizeTimer;
$(window).on('resize', function(e){
clearTimeout(resizeTimer);
resizeTimer = setTimeout(function () {
function isTouchDevice() {
return true == ("ontouchstart" in window || window.DocumentTouch && document instanceof DocumentTouch);
}
if (isTouchDevice() === true) {
$('.navbar .dropdown > a ').click(function () {
return false
});
console.log("landscape")
}
else {
$('.navbar .dropdown > a ').each(function () {
$(this).on("click", function(){
location.href = this.href;
})
});
console.log("portrait")
}
}, 250)
}).trigger('resize');
});
I think this is a problem with the way you are recognizing the mobile device. For checking device sizes I would not suggest using $(window).innerWidth(). What you are doing now does not check the screen size, rather it checks the window size, which fluctuates when switching orientation.
I would like to suggest that instead of checking for only >900px, that you check for the entire area of the device (width x height) so landscape and portrait would act the same way. And I would like to suggest using screen.availHeight * screen.availWidth to determine this.
I really hope this helps you with your problem. Please let me know if not and I'll help you debug.
I have a jQuery scroll function set up, that when the user scroll beyond 94px the .fixed-header-wrap fades in and there's a class change etc too. This function isn't working on IE browsers though, and the .fixed-header-wrap is showing on document load and not fading out / in etc. My markup below:
//Header Colour Scroll Function
var scroller = true;
$(window).scroll(function () {
if ($(".sector-menu").css('display') == 'none') {
if ($(this).scrollTop() > 94 && scroller) {
$('.fixed-header-wrap').addClass('header-shadow');
$(".fixed-header-wrap").fadeIn('fast');
$('.header-logo').fadeIn('slow');
$('.header-wrap').addClass('header-blue');
scroller = false;
} else if ($(this).scrollTop() < 94 && !scroller) {
$(".fixed-header-wrap").removeClass('header-shadow');
$(".fixed-header-wrap").fadeOut('fast');
$('.header-logo').fadeOut('fast');
$('.header-wrap').removeClass('header-blue');
scroller = true;
}
} else {
if ($(this).scrollTop() > 94 && scroller) {
$('.fixed-header-wrap').addClass('header-shadow');
$(".fixed-header-wrap").fadeIn('fast');
$('.header-wrap').addClass('header-blue');
scroller = false;
} else if ($(this).scrollTop() < 94 && !scroller) {
$(".fixed-header-wrap").removeClass('header-shadow');
$(".fixed-header-wrap").fadeOut('fast');
scroller = true;
}
}
});
Is there any reason for this or changes that can be made to make the desired effect work across all browsers?
Try changing $(window).scroll() to $('html,body').scroll(). It worked for me in a previous project... Let me know if it works.
I have some JavaScript I'm using to add a class to my <body> element when the user is scrolling:
var $body = $('body');
$(window).scroll(function() {
$body.addClass('scrolling');
var scroll = $(window).scrollTop();
if (scroll <= 1) {
$body.removeClass('scrolling');
}
});
This works well on desktop browsers, but on iOS (and possibly other mobile devices) the class is only added upon touch release rather than when the user first touches the screen to scroll.
How do I adjust this script to trigger this class upon touch, whilst still working as normal for standard desktop users?
Here's a Fiddle showing this script in action: http://jsfiddle.net/alecrust/AKCCH/
You can use ontouchstart, ontouchmove and ontouchend to handle touch events.
var $body = $('body');
if ("ontouchstart" in document.documentElement)
{
$(window).bind('touchmove',function(e){
e.preventDefault();
$body.addClass('scrollingTouch');
});
$(window).bind('touchend',function(e){
e.preventDefault();
var scroll = $(window).scrollTop();
if (scroll <= 1) {
$body.removeClass('scrollingTouch');
}
});
}
else
{
$(window).scroll(function() {
$body.addClass('scrolling');
var scroll = $(window).scrollTop();
if (scroll <= 1) {
$body.removeClass('scrolling');
}
});
}
Here is a working jsfiddle: http://jsfiddle.net/BLrtr/
There might be some complications so I suggest you read this to understand them.
Also, you might want to check these 3rd party libraries for touch events handling.