getUserMedia in PWA with manifest on iOS 11 - javascript

I have created a PWA which uses WebRTC's getUserMedia to get a live camera stream. The PWA uses a manifest.json, and works great on Android.
On iOS however, the app also works if I open the link directly in Mobile Safari, but if I add it to the homescreen, it is undefined (as iOS only allows it in the Safari-context).
As a workaround, I would like to open the app in Mobile Safari instead of fullscreen mode, but I don't know how to do this, as it automatically opens fulscreen once it detects the manifest.json.
Does anyone have an idea as how to open an app with a manifest in Safari?
Thank you!

There is a way to open the PWA avoiding full screen mode.
In manifest.json, change the display attribute to "browser".
"display": "browser"
Refer this documentation under section "Display".
You can also consider "minimal-ui" option.
Please keep in mind, when you make this change, it will not just reflect in iOS, but also in Android.
On the actual issue in accessing getUserMeida, I don't understand why its not working in full-screen mode. Its just a HTML5 feature and nothing specific to PWA. So ideally, it should work in full-screen mode as well. Try to capture for any error when you open in full screen mode and post that here if you find any. It might be due to permissions as well and I recommend solving the issue in full-screen mode for better user experience.

I figure out this by adding two manifest.json, one used by default for non ios devices and one for ios devices, I also create a detect.js script to detect wheter or not an ios device is accessing the pwa and change the manifest.json reference on the html. There is the code:
// Detects if device is on iOS
const isIos = () => {
const userAgent = window.navigator.userAgent.toLowerCase();
return /iphone|ipad|ipod/.test( userAgent );
}
// change manifest.json
if (isIos()) {
document.getElementById("manifest").href = "ios-manifest.json";
}

I would suggest you to set apple-mobile-web-app-capable to no with this meta tag in the head of the document:
<meta name="apple-mobile-web-app-capable" content="no">
This will avoid iOS to understand your web app as a PWA.

Related

Twilio programmable video zoom in camera

I am using twilio video javascript sdk in a browser (or mobile webview). It works just fine, both ends publish their tracks. But I have not found any way for a user to zoom in his/hers camera exept from a custom css solution. Is there any "native" way to zoom in a camera that is powering the published track in twilio video/webrtc?
Thanks in advance
Edit:
Actually, the navigator.mediaDevices.getSupportedConstraints().zoom is true in all cases which means it is indeed supported by webview but the track.mediaStreamTrack.getCapabilities() does not have the zoom property when in android webview. When in android chrome it works just fine. Does anyone know why this happens?
There is a relatively new API for pan-tilt-zoom that works with getUserMedia.
In a nutshell you should be able to use
navigator.mediaDevices.getUserMedia({video: {zoom: true}})
and then use MediaStreamTrack.applyConstraint to change the zoom.
See the web.dev article for the details (as well as pitfalls)

How do I lock the screen orientation to portrait in Safari using plain JavaScript?

I want to "lock" the orientation of the website to portrait mode in safari using pure javascript.
Let's say that I am building an application, I don't want users to be able to visit my app in landscape-mode. How do I do that?
Edit: I make the app in web-languages, I will assign it as a profile so anyone can download it on iPhone, so nothing with xCode or something.
the screen.lockOrientation method is not supported by Safari, so you'll have to do feature detection.
For Safari, you might try the ponyfill: https://github.com/chmanie/o9n
maybe using "windows.screen" work for you;
var alowed = window.screen.orientation.lock("portrait");

PhoneGap Build: how to open external url in device browser on Android?

External URL's don't open in the system's browser in my PhoneGap Android application. I'm using PhoneGap Build 2.3.0.
According to the Cordova documentation I used target '_system':
window.open('http://www.myurl.nl', '_system');
In my config.xml I have:
<plugin name="InAppBrowser" value="org.apache.cordova.InAppBrowser" />
<access origin="*" browserOnly="true" />
But still the links open in my apps webview.
How to solve this?
It's not the answer when you want to keep using PhoneGap Build, but I solved the problem by setting up a development environment for Cordova (PhoneGap) on my machine and compiling the app locally. In Cordova 2.5.0 window.open('http://www.myurl.nl', '_system'); works perfect, it will open the link in the system's browser.
So my advice is to stop using PhoneGap Build and start compiling your app locally. Here's how to set up your development environment for Cordova >>
Late answer,but may be it can help someone.
navigator.app.loadUrl('https://google.com/', { openExternal:true });
Cordova 3.3.1
This question is now a little old, but I felt it was worth updating. This now works fine with PhoneGap Build when used with 2.9.0.
I have compiled and tested it on Android 4.3 and iOS 6.1.3. I do not have the InAppBrowser plugin in my app as that's to open pages in the app, rather than cause the native browser to open them, and I only have the following for the access tags:
<access origin="http://127.0.0.1*"/>
<access origin="http://phonegap.com" subdomains="true" />
This worked for me. Phonegap 3.1.0.
html code:
<a id="ext-link" href="#">Google it</a>
or
<button id="ext-link" href="#">Google it</button>
Javascript (with jQuery+cordova):
$("#ext-link").on("click"), function() {
if (typeof navigator !== "undefined" && navigator.app) {
// Mobile device.
navigator.app.loadUrl('http://www.google.com/', {openExternal: true});
} else {
// Possible web browser
window.open("http://www.google.com/", "_blank");
}
});
Hope that helps.
#George Siggouroglou: It's not a good idea to use an id for elements that eventually will appear more than one time in a document. Instead, its good practice to make the code more modular.
if expecting touch devices its also a good choice to use "tap" before "click" because it fires much faster and earlier than a click. to check touch capable stuff I prefer to use modernizr because it makes feature detection a breeze.
The jQuery Mobile tap event triggers after a quick, complete touch event that occurs on a single target object. It is the gesture equivalent of a standard click event that is triggered by the release state of the touch gesture.
https://api.jquerymobile.com/tap/
hope that helps someone
**html code:**
<a class="ext-link" href="#">Google it</a>
or
<button class="ext-link" href="#">Google it</button>
Javascript (with jQuery):
//define tap or click event type on root level (can be combined with modernizr)
iaEvent = "click";
if (typeof navigator !== "undefined" && navigator.app) {
iaEvent = "tap";
}
$('.ext-link').each.bind(iaEvent, function() {
if (typeof navigator !== "undefined" && navigator.app) {
// Mobile device.
var linktarget = this.attr("href");
navigator.app.loadUrl(linktarget, {openExternal: true});
} else {
// Possible web browser
window.open(linktarget, "_blank");
}
});
Use this
window.open('http://www.myurl.nl', '_blank', 'location=yes');

Flash always on top in Android browser workaround?

I have a website with a simple Flash animation behind some text and semi-transparent images as a background. I have used swfobject to embed it and set wmode opaque to make it display correctly in most browsers.
For browsers without Flash, the user gets a static background image instead and would not know they were missing anything. However, Android users get the flash background on top of everything as per the known issue with how Flash content is rendered in the Android browser making the site unusable.
I have added a crude browser sniff javascript function to the swfobject code to prevent it from loading for any user agent whith 'Mobile' in it:
<script type="text/javascript">
if (navigator.userAgent.indexOf('Mobile') == -1)
{
var flashvars = {};
var params = { wmode: "opaque" };
var attributes = {};
swfobject.embedSWF("Images/Layout/center_flash.swf", "flashBg",
"1004", "502", "9", "false", flashvars, params, attributes);
}
</script>
The only problem I have left is for Android users browsing with 'Mobile View' turned off as the user agent pretends to be a desktop version of Safari (I think). I do not wish to disable the Flash animation for all Safari users. Is there a way of blocking it for just Andriod users - even if they have 'Mobile View' disabled?
Possible ideas include:
detecting the Flash version with JavaScript or Flash. Does Android use specific versions (version numbers) of Flash which are different from the desktop equivalent?
blocking the specific user agents used by Android devices with 'Mobile View' disabled.
Has anyone come up with an effective workaround for this issue?
Your help/input is appreciated!
You can detect android only by checking the userAgent of the browser in your JavaScript
Something like this:
if (navigator.userAgent.toLowerCase().indexOf("android") != -1)
{
// It's android
}
As far as the flash issue itself, I don't know as I never use flash :P
edit
You can also use that technique for other useragents (I.E. iPhone, iPad, safari)
edit2
Sorry, I just went on my android phone and realized the actual setting changes the userAgent to whatever the user picks (desktop/ipad/iphone/safari). That's no good then, I apologize.
Unfortunately, what you are asking is very difficult then. There are no unique identifiers in the android flash version to give you any help. And the fact that android spoofs the userAgent makes it impossibly to detect if they are on mobile or not.
There exist services that can tell you whether a user is on mobile based on their IP.
I'm sorry to say I don't know how fast, reliable, or expensive they are, but if you must determine whether a user is on Android, that's an avenue to consider

Loading JS script for only iOS devices?

I have a jQuery script I'm using on a site to allow fixed position background images on iPhone/iPad/iPod. However it seems to be clashing with another script I am using on the site that enlarges background images full screen. Luckily they're independent of each other, I don't need the clashing background image script to work on iOS devices and vice versa.
Is there a way I can specifically target IOS devices to serve a JS file? I initially thought about using some kind of IF statement and doing it on window size but that started to get a bit complicated and affects other non-IOS devices. It just needs to run something like this...
..."if IOS device then load scroll.js"
I know device/browser sniffing is frowned upon but I can't think of another way around this problem.
You can use the Mobile Safari user agent string to detect mobile safari server-side, see: How do I detect Mobile Safari server side using PHP?
You can also do this in JavaScript:
if(navigator.userAgent.match(/(iPhone|iPod|iPad)/i))
See iPhone & iPod Detection Using JavaScript for more information.
You can use Detect Mobile Browser (it has a library for javascript).
you can also try this
if (navigator.userAgent.match(/like Mac OS X/i)) {
alert('Hi, you\'re browsing from an iOS device.');
}

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