Hammer.js taps are slow on Android? - android

Situation: hammer.js 2.0.4, jQuery 2.1 on a Cordova cross-platform mobile app. I was running into well-documented (for example) issues with delay of click events, so I thought I'd try hammer.js for this. It works beautifully on my iPad, but on my Android phone (Android v4.4) is dreadful: very slow to respond, and frequently misses taps entirely.
I implemented my own small tap detection (using mouseUp events) and it performs much better than Hammer.js on my Android (but terribly on my iPad).
So my question is: are there known issues for hammer.js on Android, or known workarounds? I'd really prefer not to conditionally use two different approaches based on platform, especially when there is no conceivable way for me to test all possible mobile platforms.
Example of the hammer.js tap code; nothing very interesting going on:
$(".menuitem").each( function(i, elem) {
var mc = new Hammer.Manager(elem);
mc.add(new Hammer.Tap());
mc.on("tap", action);
});
In addition there is a top-level swipe recognizer that covers the entire page:
var swipelistener = new Hammer($("body")[0], {
recognizers: [[Hammer.Swipe,{ direction: Hammer.DIRECTION_RIGHT }]]
});
swipelistener.on("swipe", swipeRight );
In total there will be fewer than two dozen elements responding to tap events, and no overlapping or nested elements. I thought it might have something to do with the swipe recognizer overlapping the tap recognizers, but removing the swipe listener didn't change the tap behavior at all.

You need to play with the settings of each recognizer.
hammertime.get('swipe').set({
direction: hammer.DIRECTION_ALL, threshold: 1, velocity: 0.1
});
This worked for me for swipe on 4.1.1
Would be really helpful if someone could write some example code for tap as I'm still fiddling with that.
Also, you don't need mc.add as the Manager by default has all the recognizers. You only need to use .add once you've manually removed (using mc.remove) one.
If you are unsure what settings any of the recognizers have, look on their website eg http://hammerjs.github.io/recognizer-swipe/ shows that I could set direction, threshold and velocity etc as per the code above.

As I can see you need to detect swipe on entire screen without any specific options. Maybe cordova-android-gestures (only for Android) helps you? This plugin "catches" gestures on total device surface. So, for detect swipes:
//check the platform
if (device.platform=="Android") {
MegaduckGestures.swiper(function(direction){
switch (direction) {
case 'rightSwipe':
//do your staff
break;
case 'leftSwipe':
//do your staff
break;
default: break;
}
});
}
else {
//use your iPad approach
}
And for handling tap on menu item:
$(".menuitem").each( function(i, elem) {
//check the platform
if (device.platform=="Android") {
MegaduckGestures.swiper(function(direction){
if (direction=='singleTap') {
//do your staff
}
});
}
else {
//use your iPad approach
}
});

Related

Angular event.target.blur() not working for mobile

I have the following code to prevent the buttons to stay focused after they are clicked. It works perfectly for desktop but it doesn't work at all when testing on mobile devices (Both iOS & Android), I'm not sure if I'm missing something here (I already tried replacing click with touchstart and touchend).
this.renderer.listen('document', 'click', (event) => {
if (event.target.nodeName === 'BUTTON') {
event.target.blur();
} else if (event.target.parentNode.nodeName === 'BUTTON') {
event.target.parentNode.blur();
}
});
Ok so I figured it out, in case anyone ever comes across this situation:
It WAS actually working, but on mobile devices an "emulated" hover is also applied after pressing buttons, so what I was seeing was the hover state, not the focus one.
I fixed it by wrapping the hover style of my button inside this block, to make sure that the device supports ACTUAL hover (e.g. using a mouse):
#media (hover: hover) {
your-element:hover {
//hover style
}
}

Touchmove & vmousover not working in a Cordova/PhoneGap Android app

I've tried both techniques in this answer to get a "dragging touch highlight" across elements in my PhoneGap App (testing on Android).
Here's my JSFiddle of the touchmove approach
$("td").bind("touchmove", function(evt){
var touch = evt.originalEvent.touches[0]
highlightHoveredObject(touch.clientX, touch.clientY);
});
Here's my JSFiddle of the vmousemove approach
$("#main").bind("vmousemove", function(evt){
$('.catch').each(function(index) {
if ( div_overlap($(this), evt.pageX, evt.pageY) ) {
$('.catch').not('eq('+index+')').removeClass('green');
if (!$(this).hasClass('green')) {
$(this).addClass('green');
}
}
});
});
Both work perfectly when emulating the app from desktop browser. Both work when viewing the JSFiddles from my Android tablet browser. But in the installed app on the tablet, it doesn't work. Instead of an updating highlight as I drag across the elements, all I get is a highlight on the first-touched event. The same for both methods.
Any ideas what's going on?
A comment on this question has an intriguing suggestion that "If you are running on android you also need to cancel the touchmove event to get new ones while touching. Don't ask me why...". Does that ring a bell, and if so, how would I "cancel the touchmove event to get new ones" with either of these approaches?
Alternately, has anyone successfully done a "dragging highlight" effect on a PhoneGap app, and would you care to share your technique?

Swipe event not firing on android stock browser

I'm using Touchswipe to trigger events based on swipe right and swipe left. After a lot of testing, i found that touchswipe is not working on android stock browsers since touchswipe is not firing swipe events on stock browsers. Any work around for this?
Code to trigger:
$(function() {
//Enable swiping...
$("#content").swipe( {
//Generic swipe handler for all directions
swipe:function(event, direction, distance, duration, fingerCount) {
if(direction == "left"){
}else if(direction == "right"){
}else if(direction == "down"){
// event.preventDefault()
}
},
threshold:0
});
});
Well, after a lot of issues i found that swipe event on android STOCK browsers can't be triggered with code from an external Js file but works if put on same html file. Weird but works.
Have you tried using jQuery mobile to support the swipe functionality. The developer API is given here.
The difference here, is that instead of calling $(document).ready(function() ...) we can call: $(document).bind('pageinit')

jQuery.mobile popup immediately hides after showing

I have a small phonegap application with jquery mobile and backbone.
I'm trying to show popup to user by manually calling .popup() method.
Everything works fine on iOS but on android I got strange issue: popup is showing for few moments and than disappear.
Here the actual code:
var PostView = Backbone.View.extend({
events: {
'touchend .add-comment-button': 'addComment'
},
addComment: function() {
this.$(".comment-popup").popup('open', { history: false });
return false; // Stop bubbling.
}
});
I'm using history: false because this popup is actualy part of subpage.
The code looks very simple, I'm just can't understand why it can disappear, and why this happen only on android devices.
Thanks, and sorry for my bad english.
I spent hours trying to fix this problem.
Finally I ended up doing the following two things that seemed to fix the problem.
1 - Use the uncompressed jqm file. i.e jquery.mobile.1.2.0.js
2 - I was triggering the popup programatically using the 'tap' option - once changed to the 'click' option it worked.
$('.option').live('click', function() {
$('#popup-div').popup('open');
});
I spent hours trying to fix this problem.
Finally I ended up doing the following two things that seemed to fix the problem.
this code snippet may help you ->
$('#testBtn').on('tap',function(e){
console.log("button clicked");
e.preventDefault();
$('#testPOPUP').popup("open");
});
Please note i have used e.perventDefault().
I didn't feel like changing my .tap() events to the click event and I didn't have a case where I could use preventDefault()so I just added a timeout to the popup('open') line. My hoverdelay in jqm is set to 150 so I set this timeout to 600 just to be on the safe side. Works fine, doesn't feel sluggish for the user.
One way to 'fix' it is by setting data-history="false" on the popup div
See also this question
JQuery Mobile popup with history=false autocloses
I have the exact same problem when trying to use popup('open') on an android 2.3 device (both in native browser and in firefox) and it works just fine on browsers on other devices. I'm also using backbone event management to open my popup (used the tap event and no aditionnal options to popup).
What I did to 'correct' the problem is that I removed the backbone event management for this event and added a listener in the render function. In your case this would look something like this :
events: {
// 'touchend .add-comment-button': 'addComment'
},
render: function() {
$(this.el).html(this.template(this.model));
$(this.el).find('.add-comment-button').tap(function(el){
this.addComment(el);
return false;
}.bind(this));
}
I have no idea where the problem comes from (must be some incompatibility between backbone and jquery mobile) and why we only see it on android but for the moment with this workaround my app seems to work fine on any device.
Edit: oops, it turns out that in my case the problem was I was missing "return false;" in the function dealing with the event.
Now that I added it, it works correctly with the backbone event management.
Sadly that doesn't explain why you have the issue and why I was seeing it only on android.
In case it helps anyone, I had the same problem occurring with Bing Maps, with the Microsoft.Maps.Events.addHandler(pin, 'click', callback) method.
Not particularly nice, but instead I stored an ID in pushpin._id and did the following:
$("#page").on('vclick', function (event) {
if (event.target.parentElement.className === "MapPushpinBase") {
$("#stopPopup").popup('open');
}
});
One brute force option is to check whether popup was hidden and reopen it.
In a loop, because the exact time the popup becomes hidden seems to be varied.
var hidden = $('#' + id + '-popup') .hasClass ('ui-popup-hidden')
if (hidden) $('#' + id) .popup ('open')
A working example: http://jsfiddle.net/ArtemGr/hgbdv9s7/
Another option could be to bind to popupafterclose:
var reopener = function() {$('#' + id) .popup ('open')}
$('#' + id) .on ('popupafterclose', reopener)
$('#' + id) .popup ('open')
Like here: http://jsfiddle.net/ArtemGr/gmpczrdm/
But for some reason the popupafterclose binding fails to fire on iPhone 4 half of the time.

Is there jQuery Mobile's equivalent to the Android's ViewPager?

I want to create a horizontal swiping effect using jQuery Mobile. After doing a little bit of research, I found out that ViewPager, which is generally found in the app details page of Android Market, does what I want. In the page specified the author describes it along with code in Android, but I wanted to know if there is an equivalent plug-in or feature in jQM.
I like SwipeJS, it's lightweight and I like the one-to-one slide factor it uses (when you slide your finger across the element, it moves at the same rate).
There is also iScroll 4 that works pretty well (it seems to be more difficult to setup than SwipeJS).
You can however utilize the built-in swipe events in jQuery Mobile. You can bind to the swipeleft or swiperight events for the data-role="page" element(s) and navigate the user to the correct page based on the current page:
$(document).delegate('#page-two', 'swipeleft', function () {
//next page
$.mobile.changePage($('#page-three'));
}).delegate('#page-two', 'swiperight', function () {
//prev page
$.mobile.changePage($('#page-one'), { reverse : true });
});
Here is a demo: http://jsfiddle.net/fFGvD/
Notice the { reverse : true } object being passed as the option object to the changePage() function so the animation will play in reverse.

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