Avoid 2-finger scroll to trigger back/forward - javascript

I'm trying to find a way to avoid triggering the back/forward in the browser when the user uses a 2-finger scroll (eg: OSX).
just like this:
https://tweetdeck.twitter.com

Mobile devices are notoriously annoying for handling touch events. However, if you return false or preventDefault() on a DOM touch event you will prevent the browser from scrolling/zooming/navigating.
The below example will prevent all touches from executing default behavior; meaning link touches won't register, scrolling won't work etc.
$("body").on("touchstart", function(e){
e.preventDefault();
});
The following will prevent default functionality of multi touch.
$("body").on("touchstart", function(e){
if (e.originalEvent.touches.length == 2) {
e.preventDefault();
}
});
If you need to allow the user to click links, you would do something along the lines of the following.
$("body").on("touchstart", function(e){
if (e.target.tagName != "A") {
e.preventDefault();
}
});

Related

Javascript preventDefault() not working in Safari

I am working on an application using javascript and I want to get mouse events. To stop the options that appear when right clicking I use the preventDefault() function and it works in Firefox and Chrome but it doesn't work in Safari. This is my code:
document.querySelector("#GL-Surface").addEventListener("mousedown", function(e) {
e.preventDefault();
/* Handle mouse events */
});
From an other question I got that you should return false; but this still doesn't work. preventDefault() however works in Safari when it is used in keyboard inputs. So how can I prevent the default actions for mouse events in Safari?
To target right click events, use contextmenu rather than mousedown.
document.querySelector("#GL-Surface").addEventListener("contextmenu", function(e) {
e.preventDefault();
});
Note that the options that appear on right click do appear only when the right click button is released, so I don't think mousedown is at all suitable here.

.addEventListener('click', classToggle) not working on touch devices [duplicate]

I've got a sub-nav that works using jquery - A user clicks on the top level list item, for instance 'services' which triggers the dropdown. The dropdown toggles via clicking the 'service' link. I've made it so a user can click anywhere on the screen to toggle the dropdown to a closed state. But as the site is responsive i want the user to be able to click (touch) anywhere on the screen to close the dropdown but my problem is that it's not working on the touch devices.
My code ive setup for the document click is:
$(document).click(function(event) {
if ( $(".children").is(":visible")) {
$("ul.children").slideUp('slow');
}
});
I'm assuming document.click might not work on touch devices, and if not, what work-around is there to achieve the same effect?
Thanks
Update! In modern browsers, the click event will be fired for a tap, so you don't need to add extra touchstart or touchend events as click should suffice.
This previous answer worked for a time with browsers that thought a tap was special. It originally included a "touch" event that actually was never standardised.
Unless you have a problem with:
$(document).on('click', function () { ... });
There is no need to change anything!
Previous information, updated to remove touch...
To trigger the function with click or touch, you could change this:
$(document).click( function () {
To this:
$(document).on('click touchstart', function () {
The touchstart event fires as soon as an element is touched, so it may be more appropriate to use touchend depending on your circumstances.
touchstart or touchend are not good, because if you scroll the page, the device do stuff.
So, if I want close a window with tap or click outside the element, and scroll the window, I've done:
$(document).on('touchstart', function() {
documentClick = true;
});
$(document).on('touchmove', function() {
documentClick = false;
});
$(document).on('click touchend', function(event) {
if (event.type == "click") documentClick = true;
if (documentClick){
doStuff();
}
});
can you use jqTouch or jquery mobile ? there it's much easier to handle touch events.
If not then you need to simulate click on touch device, follow this articles:
iphone-touch-events-in-javascript
A touch demo
More in this thread
To apply it everywhere, you could do something like
$('body').on('click', function() {
if($('.children').is(':visible')) {
$('ul.children').slideUp('slow');
}
});
As stated above, using 'click touchstart' will get the desired result. If you console.log(e) your clicks though, you may find that when jquery recognizes touch as a click - you will get 2 actions from click and touchstart. The solution bellow worked for me.
//if its a mobile device use 'touchstart'
if( /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ) {
deviceEventType = 'touchstart'
} else {
//If its not a mobile device use 'click'
deviceEventType = 'click'
}
$(document).on(specialEventType, function(e){
//code here
});
the approved answer does not include the essential return false to prevent touchstart from calling click if click is implemented which will result in running the handler twoce.
do:
$(btn).on('click touchstart', e => {
your code ...
return false;
});

dropdown menu not working on mobile, document click not triggered [duplicate]

I've got a sub-nav that works using jquery - A user clicks on the top level list item, for instance 'services' which triggers the dropdown. The dropdown toggles via clicking the 'service' link. I've made it so a user can click anywhere on the screen to toggle the dropdown to a closed state. But as the site is responsive i want the user to be able to click (touch) anywhere on the screen to close the dropdown but my problem is that it's not working on the touch devices.
My code ive setup for the document click is:
$(document).click(function(event) {
if ( $(".children").is(":visible")) {
$("ul.children").slideUp('slow');
}
});
I'm assuming document.click might not work on touch devices, and if not, what work-around is there to achieve the same effect?
Thanks
Update! In modern browsers, the click event will be fired for a tap, so you don't need to add extra touchstart or touchend events as click should suffice.
This previous answer worked for a time with browsers that thought a tap was special. It originally included a "touch" event that actually was never standardised.
Unless you have a problem with:
$(document).on('click', function () { ... });
There is no need to change anything!
Previous information, updated to remove touch...
To trigger the function with click or touch, you could change this:
$(document).click( function () {
To this:
$(document).on('click touchstart', function () {
The touchstart event fires as soon as an element is touched, so it may be more appropriate to use touchend depending on your circumstances.
touchstart or touchend are not good, because if you scroll the page, the device do stuff.
So, if I want close a window with tap or click outside the element, and scroll the window, I've done:
$(document).on('touchstart', function() {
documentClick = true;
});
$(document).on('touchmove', function() {
documentClick = false;
});
$(document).on('click touchend', function(event) {
if (event.type == "click") documentClick = true;
if (documentClick){
doStuff();
}
});
can you use jqTouch or jquery mobile ? there it's much easier to handle touch events.
If not then you need to simulate click on touch device, follow this articles:
iphone-touch-events-in-javascript
A touch demo
More in this thread
To apply it everywhere, you could do something like
$('body').on('click', function() {
if($('.children').is(':visible')) {
$('ul.children').slideUp('slow');
}
});
As stated above, using 'click touchstart' will get the desired result. If you console.log(e) your clicks though, you may find that when jquery recognizes touch as a click - you will get 2 actions from click and touchstart. The solution bellow worked for me.
//if its a mobile device use 'touchstart'
if( /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ) {
deviceEventType = 'touchstart'
} else {
//If its not a mobile device use 'click'
deviceEventType = 'click'
}
$(document).on(specialEventType, function(e){
//code here
});
the approved answer does not include the essential return false to prevent touchstart from calling click if click is implemented which will result in running the handler twoce.
do:
$(btn).on('click touchstart', e => {
your code ...
return false;
});

How to completely remove mobile browser long-press vibration?

I'm trying to completely remove the vibration that occurs on a long press of an element in a mobile browser.
Specifically, I have an image that I'm adding my own long-press functionality to, but the subtle short-vibrate that happens by default is interfering and I need to disable it.
I've successfully stopped the usual context menu from appearing by overriding it as follows:
window.oncontextmenu = function (event) {
event.preventDefault();
event.stopPropagation();
return false;
};
I've also added CSS to stop highlights and text selection etc - but I haven't been able to figure out what's causing the default vibrate after a few hundred ms.
Is there another lifecycle event that's popped on a long-press in a mobile browser, in or around oncontextmenu?
Full plunker Example here, long-press on the image from a mobile browser (I'm using chrome on Android) to see what I mean: https://plnkr.co/edit/y1KVPltTzEhQeMWGMa1F?p=preview
Disable the text selection when its clicked on.
document.querySelector("#your_target").addEventListener("touchstart", (e) =>
{
e.preventDefault();
e.stopPropagation();
this.style.userSelect = "none";
});
document.querySelector("#your_target").addEventListener("touchend", (e) =>
{
e.preventDefault();
e.stopPropagation();
this.style.userSelect = "default";
});
You could use touch-action: none; in CSS. Then you might be able to handle an interaction event to do what you want.
https://developer.mozilla.org/en-US/docs/Web/CSS/touch-action

Prevent click events on links but allow touch events

Im using hammer.js for gestures in a html5 app, also on phonegap.
I want to prevent normal clicks of links to go to the link, but I want t tap event to let the link pass. Im trying this sofar, but it prevents both events, I guess the click events comes first
$(document).hammer().on("tap click", "a", function(e){
if e.type == "click"
return false
}
I want to do this because I have a hold event, and after the hold is done over a link, the link is fired. I dont want this to happen..
listen for
$(document).on('touchend',function(e){
/*
you code here
*/
e.preventDefault();
e.stopPropagation()
});

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