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I built a Hbbtv Application.
I want to analyze the performance of the app when running on TV.
Since there is no developer tools usage on tv, how do I get the rendering, page loading, blank rate time?
Is it possible to display these using javascript?
You might add google analytics to your site. Implement device detecting and then if it is TV send performance analysis results (previously implemented performance functions). Functions something like these examples: http://qnimate.com/measuring-web-page-performance-using-modern-javascript-apis/ http://blog.trasatti.it/2012/12/measuring-the-speed-of-resource-loading-with-javascript-and-html5.html , https://trackjs.com/blog/monitoring-javascript-memory/ , https://medium.com/#felipedutratine/frontend-performance-monitoring-in-js-29832051d2ec
You should detect TV user agent and then simulate it in Google Chrome Dev Tools (w3c validator also allow do that) and then perform audit test in Google Chrome Dev Tools "Audit" tab.
Check https://developers.whatismybrowser.com/useragents/explore/operating_platform/smart-tv/
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With the release of new web-bluetooth features, I believe iBeacon/Eddystone beacon scanning is possible in PWAs using web-bluetooth. I am running a use-case and I would like some help on achieving a background service worker, which scans for beacons in background using chrome service-workers or something similar in smartphones?
Is this possible and if yes how?
According to the Chrome feature status page, the Web Bluetooth scanning feature has not been implemented at all as of May 2019. This makes it impossible to scan for beacons: https://github.com/WebBluetoothCG/web-bluetooth/blob/master/implementation-status.md#scanning-api
There are other APIs implemented that let you find and connect to Bluetooth devices, but because you cannot see and decode the advertisements (what the above unimplemented API would provide), you cannot use them as beacons.
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I know difference between browser Js and NodeJS. I'm looking at this trezor.io bitcoin hardware wallet. How are they managing to send information from their drive to javascript on website only trough USB port ? (device has no WiFi or Bluetooth) ?
By requiring that you install an application on the computer.
It's a Chrome extension, using chrome.usb.
This is the leading edge of the WebUSB stuff, which will allow JavaScript in browsers to access USB devices. (Obviously there's some security stuff that's having to be worked through...)
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I want to buy a DVB-T stick which gets connect to PC and laptop by USB and has a software to play live TV on windows. What I want to do with that is to show the live TV stream from that stick on a web browser instead of the original windows software. The reason behind that is I need to use it in a digital signage program which only supports web platform for these kind of medias.
As far as I know, if I could make a html page which contains the player to show the live stream from the USB stick, the job is done, but my question is how to write that html page exactly. Any suggestion?
Thanks for paying attention to my question and helping me in advance.
This is not possible with HTML. Also PHP and JavaScript will not fit this problem. Because that are web based languages. You can not access plugin devices in any way.
The only way you can do is to write an application in C#/C++/Java which will read the usb and open it in a webview to show.
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we have built mac and windows desktop version of our app using electron framework, but it hangs and become unresponsive really often. Using chrome natively it does not happen. Is there any flags that needs to be added/removed when using electron framework, and what could be the difference? The biggest problem that I don't have knowledge how to debug these kind of problems, because logs does not return anything before hanging, and profiling becomes unresponsive too. Any suggestions?
Thanks!
You can open the Chrome Developer Tools with
require('remote').getCurrentWindow().toggleDevTools()
From there you can profile it like a normal webapp, you can take a look there what takes much time. There are many good tutorials how to use these tools.
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I am trying to figure out is it possible to make Internet Cafe client launcher with Electron. The app would have to prevent the user from ALT+TAB or CTRL+ALT+DEL it would also have to: run on startup, cover full screen, shut other processes down, run executable binaries and so on. I never before made application of this kind and do not know what kind of things am i looking for. First thing that i remember when using some other Internet Cafe clients is that they needed administrative rights, so i found electron-sudo, but that is about it of what i know.
NW.js has Kiosk Mode.
https://github.com/nwjs/nw.js/wiki/the-kiosk-mode
It's similar to Electron but it runs a webpage first, not a script (if that makes sense). Basically, you get a browser that lets you run node.js.
And Kiosk mode.
Ah, so does Electron!
kiosk Boolean - The kiosk mode
I did not know that.