Develop Reference

<a href="fb//"> open post/video Link in native App? [duplicate]

Some dev blogs have published information about the "fb://" url scheme for opening various views in the Facebook iPhone App. No matter how much I've searched, I haven't found one word from any official Facebook source about this.
Since the information is public anyways, I'm sure I'm not the only one who'd like to know, whether using this url scheme is officially approved, am I allowed to use it, does it work correctly, and if it's not approved, will it be and what's the approximate schedule for that?
Thanks in advance for any info on this subject!

It's there to support the iOS push notification system (i.e. you get a push notification that says "Friend's Name tagged you in a photo", and you tap on it, it takes you straight to the photo).
I'd assume it's not intended for third party use and therefore subject to change. Hell, Facebook's public-facing APIs are subject to change on a whim anyhow, so I'd be especially cautious about something they hadn't documented.

It's for iOS only. The iOS API lets you define you own URL scheme, so Facebook must have developed their application to register the fb:// URL scheme on iOS devices. It's not a feature that was created by Apple, it's something you, the developer, can make up.
Here are some resources you can investigate
The Facebook iOS SDK
Here on StackOverflow
A tutorial on how it works (not Facebook-specific)
You can use it from your own applications on iOS, but only if the Facebook application is installed. There are, however, plugins and browser extensions out there that mimic the behavior by handling the fb:// schema on your desktop browser.

Allow access to weblink only via native iOS and Android apps

I have website link at which I have designed a html/javascript web app. I used iOS and Android app to create an app that encapsulates the web app.
Is there a way to block access to the website link and only allow access to the website link only thru the native apps calling the link.
In short safari, IE, Chrome must not be able to access the link, but the iPhone & Android app should be able to access it.
Is there some way to tell that the app is accessing the site and not the phone or pc browsers.
I am sure there a number of ways to implement this.
Thanks,

It depends on how is the web app implemented. Since native Web Views are pretty much the wrapper for the standard browser (Safari/Chrome), you will find it tough to filter it based on that.
What you can do, however, is to add an extra GET variable (for ex. &ref=youruniquecodehere) or a custom User-Agent, based on which you will be able to identify, whether your application authorized the request (with a proper access code) or if it's a generic request using browser.
However, both of these options can still be bypassed if researched, although it'd require slightly more time. Not sure whether a solution that would work in 100% of cases exists.
Hope that helps, please correct me if I'm wrong.

Can a website (HTML5,JavaScript) access a mobile device's (android/iPhone) contact list, SDCard files

Can a website (HTML5,JavaScript) access a mobile device's (android/iPhone)
contact list, SDCard files?
A website as in one opened in a browser not a phonegap application/webapp.

There was an attempt at the W3C to create a browser API to access contacts from the browser.
This is often mentioned as one of the new HTML5 APIs.
However the attempt never became a real specification and never got implemented by any browser vendors. Now it is officially discontinued:
http://www.w3.org/TR/contacts-api/

You can't access the mobile device file system through a website, it would be a major security problem. You might be able to steal all user files if you can access them through the browser. Hope this helps.

At this point in time there is no way to access the internal APIs from Android, iOS and Windows Phone via a simple website. This also precludes you from accessing aspects such as the contact list because these are all only accessible via API calls.
Solutions that allow you to code phone apps or web apps in JavaScript or HTML5 and still grant access to APIs do so by utilizing a wrapper with calls back to the native code. But you can't call native code from an external source such as a website.

Chrome has since shipped their own version of a "Contact Picker" HTML5 API in Chrome 80: https://web.dev/contact-picker.
Chrome only: it is not a W3C Standard nor is it on the W3C Standards Track.
selectRecipientsButton.addEventListener('click', async () => {
const contacts = await navigator.contacts.select(['name', 'email'], {multiple: true});
if (!contacts.length) {
// No contacts were selected in the picker.
return;
}
// Use the names and e-mail addresses in |contacts| to populate the
// recipients field in the website’s UI.
populateRecipients(contacts);
});

Am not so sure if the author of this question will still be interested in a solution but I use this on my apps, its really a handy way of access native api from html5 apps. http://bridgeit.mobi/bridgeit.html#features
BridgeIt enables any web application to access a wide range of mobile device capabilities using a simple JavaScript API.
Using this tool is as easy as 1, 2, 3…
Include the BridgeIt JavaScript in your page
<script type="text/javascript" src="http://api.bridgeit.mobi/bridgeit/bridgeit.js"></script>
Attach a BridgeIt call to some action element on your page, and provide a callback to handle returned values from BridgeIt. For instance, a button to retrieve a contact from the address book...
bridgeit.fetchContact('element_ID', callback_Function);
Access the page from your mobile browser. If the BridgeIt utility app is not already installed, you will be prompted to do so. Once the BridgeIt utility app is installed, your application can access all of BridgeIt's native features.
Example code can be found here https://github.com/bridgeit/bridgeit.js/wiki/Contact-List-Tutorial

https://developers.google.com/people/
You can't access Contacts by website stored on phone, but you can do it server side using People API. If user stored everything on the cloud - you win. Perhaps this is only way to provide native-like experience on your website

You can access address book using Autofill feature of safari browser in iOS devices (but settings > safari > autofill > contact info must be turn on). And the name field in must be "name, email, phone, tel, etc" to get autofill works properly. It works only in Safari but not in other browsers.

Using pure HTML
<input type="file">
you can access files from mobile device,but you cant access contact.

Cross Browser Platform Data Storage

I am creating a Cross browser Platform Web Application (HTML, JS, CSS), However I require a strong database storage that I can query on the client using JS. Web SQL/SQLite seems to be the best way to go BUT there is no support for it in IE. Does anyone know of any other querable client storage out there. or a working implementation of embedding SQLite "like" functions into the browser.
Thanks

The Web Storage API is available in all major browsers including mobile and desktop. I haven't used it before, but from my research I can tell that it doesn't use SQL queries. It seems to be the best option, even so I would recommend still using a fallback for browser that won't support the API (for example anything before IE8).
Hope this works out for you!

How do I detect user's location from a webpage opened in the Android browser?

Visiting www.google.com on the Android browser (or even with an android spoofed user-agent), presents the option to "Share Location". When clicked, it uses the GPS/Cell phone towers to figure out the location. I tried the google.loader.clientLocation but that only works using the IP address.
Is there a method to tap into the Android OS and access GPS data from a regular web application (and not an Android application) similar to the way Google does?
[Perhaps Google uses the Google Gears app on Android to access this data.]
Thanks!

This is an HTML5 API, and it'll work on Webkit-derivatives, Chrome, and Firefox 3.5 (for now).
http://dev.w3.org/geo/api/spec-source.html
http://merged.ca/iphone/html5-geolocation

I was trying that recently and found this forum posting interesting. I did not find a real good way to do this either and it doesn't look like we can do that without writing our own app which opens a browser instance.
http://androidforums.com/support/8868-how-get-gps-coordinates-browser.html

Here is also a nice example: http://klauskjeldsen.dk/w3c-geolocation-api-html5/