Is it applicable in react native? Will it work on the android applications?
It's working in localhost on how to implement it in react native
Webgazer.js is not available on React native. As the documentation says, it is only available on Firefox, Chrome, Opera, Edge, and Safari.
However, if you want to add it to your React Native App, you can use react-native-webview. You'll have to build an HTML/CSS/JS app with WebGazer. Then, load it in your app using the webview library.
React-native-webview supports iOS and Android
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I've searched some times here but could't find an Answer to this.
Does someone know this and can explain how Ionic handles it?
Does Ionic compile the Code to Native? NO
Ionic is for developing Hybrid apps.
What are Hybrid apps?
Hybrid apps are essentially websites embedded in a mobile app through
what we call a webview. They are developed using HTML5, CSS, and
Javascript, and execute the same code regardless of the platform in
which they run. They can, with tools like PhoneGap and Cordova, use
the native features of a device, like GPS or camera.
What are Native apps?
Native apps are developed in the language required by the platform it
targets, Objective-C or Swift for iOS, Java for Android, etc. The code
written is not shared across platforms and their behavior varies. They
have direct access to all features offered by the platform without any
restriction.
Here is a nice article about it.
Cordova converts the project into a native which has only ONE Page, that is a WebView (WKV WEB View in iOS, etc). And all of the ionic code is run on that webview. Basically an ionic/cordova app is a website which looks like an app!
Can't seem to find which rendering engine the mobile app wrapper Ionic uses. Is it Webkit?
Ionic's Cordova is essentially opening a webview from the native app. That means the rendering engine is different on every device. For example, on the latest devices, Android uses webkit, and iOS uses WkWebView. That's where you have to be careful. Some styling like css-animation behaves differently.
To add to the other answer:
If you wish to have the same experience across the platform, you could always resolve to using the crosswalk plugin. On android, it basically installs the webkit and uses it instead of the native webview, so that it will always display the same across devices. On iOS, there is a similar version for the iOS8 and up to use the new wkWebView and not the old uiwebview. Just google cordova crosswalk and it should come up.
I am developing an application targeted only for iOS device(for now) using PhoneGap library and HTML5. This application is going to be only a web page accessed through iOS Safari browser. I am going to use certain features like accessing accelerometer, geolocation, contacts etc of iOS device using PhoneGap library.
Will I get access to all these features without installing anything on the device.
I want to understand how does PhoneGap get access to native features
of the device by just using JavaScript only?
I see there are several useful plugins written for PhoneGap library.
Can I simply use those plugins(js files) into my page without
installing anything on the device? E.g PhoneGap ChildBrowser plugin?
Will I get access to all these features without installing anything on the device.
You will have to build as a native ios app and install it to the device.
I want to understand how does PhoneGap get access to native features of the device by just using JavaScript only?
Phonegap provides a Javascript interface to access hardware features which are actually Objective-C functions. If you look at Phonegap source you'll see a lot of Objective-C code. So it's not only Javascript.
I see there are several useful plugins written for PhoneGap library. Can I simply use those plugins(js files) into my page without installing anything on the device? E.g PhoneGap ChildBrowser plugin?
No. They have to be inside an iOS app to be able to work.
It seems like what your after is a way to access the features of an APP only through the browser.
You can access some things using HTML5 e.g.:
Geo location http://html5demos.com/geo
Accelerometer http://menscher.com/teaching/woaa/examples/html5_accelerometer.html
Video Embedding http://www.w3schools.com/html5/html5_video.asp
If I have an application build using PhoneGap is it possible to add to it platform specific code?
For instance, for an iOS version I would like to add Heatma.ps SDK.
Heatma.ps SDK is an iOS specific static library written in Objective-c.
yes you can add as much platform specific code as you want. Phonegap is just for the interaction of the platform specific code and the javascript. Its the plugin mechanism that makes Phonegap what it is. Even if you have a native app, you can add a bit of Phonegap in it by having a page somewhere which is basically a webview and is manipulated by js. Phonegap is what launches and manages the interactions of the js and the native part of the app.
Can we build an iphone app and convert the application to the android application using phonegap framework?
I have been through various links.
We basically need to develop a webapp for that and that can be converted to an android app or an iphone app respectively.
I am an iphone application developer and i am not at all familiar to android.
Links or example code would be greatly appreciated.
PhoneGap will not enable you to "port" an existing iphone application to Android. However, if you develop an application within the PhoneGap framework (which means using html, css and javascript), you will be able to deploy it on multiple mobile platforms such as iPhone, Android, Nokia, Blackberry, etc.
The downside is that you will eventually be developing a packaged mobile website - your application consist of html pages, css styling and javascript behaviour/logic, combined whith access to phone internals such as gps, disk, database, camera, etc. It will usually not "feel" fully native on most platforms. For example, you will not be using the system's "native" ListView.
There are javascript libraries such as JQuery-mobile, JQTouch, etc, that make your application look nicer on mobile devices, but it's still not as good as the native experience.
The app you build will not be a native Android or IPhone app but a HTML Web App wrapped in the PhoneGap wrapper and packaged into a native app. So yes you can build for both platforms as long as you build a Web App
Edit -(a Web App is just a plain html/css/javascript + server-side(php, asp etc) website)