Develop Reference

Will my Javascript BLE application that I wrote for Chrome on desktop also work on Chrome on Android?

I hacked together a website (HTML+CSS+Javascript only) that I use offline to control some Bluetooth Low energy devices. I was thinking of hosting it with Apache on my local network so that I could use it on laptops and maybe phones around the house. I only use Chrome on all my devices.
What would happen if I went to the website on my Android Phone? I assume the CSS and HTML would load fine but what happens to the Javascript? Will it run at all? Are all the BLE methods different?
PS: Basically I want to know if my idea is too far-fetched to even attempt. If it's way easier to just develop a separate app in Kotlin in Android Studio I'll take that route and not even bother with Apache.

Yes. Web Bluetooth API was shipped on for desktop and Android since Chrome 56.
Check here: https://www.chromestatus.com/feature/5264933985976320

JavaScript console library

I have heard about a JavaScript library that simulates the console from development tools, but I can't find anything on the web.
My need is when I deploy my HTML5 + JavaScript application (with Icenium) in a device (tablet or smartphone and Android or iOS). Sometimes some bugs only occurs on those devices and not in my desktop's simulator, so a console running on it will be very helpful.

Are you looking for something like jqconsole?

Not JavaScript tools for emulating the console, but here are some other ways around it:
Chrome for Android has remote debugging through Chrome for Desktop
And I think Safari has a similar feature for iOS devices.

javascript not working on native android browser

I am part way through developing a mobile web app which contains almost no HTML elements. JSON2HTML is used to create HTML elements.
My problem is that it works ok except for on
iPad
Android 4.0.3 Native browser.
The problem with these browsers is that the content isn't being rendered.
It works fine on
Android 4.0.3 Chrome,
Android 4.0.3 Firefox
Android 4.0.3 Opera
Android 4.0.3 Dolphin
Android 4.1.1 Native
Android 4.1.1 Other browsers
Just to clarify, this is a mobile web app, not a native mobile app. I am not using any native code, I am using standard web technologies (HTML5, CSS3, jQuery, Javascript, JSON)

After days of research and testing, I have found the solution.
First I activated the built-in debugger on my Android phone - instructions at http://tinyurl.com/768qltl
The debugger then told me that the error was at line 71 of jquery.json2html.js
I opened jquery.json2html.js
I replaced line 71 with the following code
else $.fn.append.call($(this),$(dom).children());
This works because the previous line 71 was calling the jquery append.apply function, which only works with specific data type on older browsers.

Your best bet would be finding a way to remotely debug what's happening in the native browser. There are a couple ways to do this.
Install an app like JsHybugger, which acts as a reverse proxy
Add some new JavaScript to the source page and use Weinre, JSConsole, or to attach remotely

How to debug app in Ipad?

I’ve created an app and installed it on my iPad. Unfortunately part of the functionality is not working: when I press a certain button, it should execute some JS code, but this is not the case. In the tool which I use for creating it, there’s no bug, no exception, nothing that leads to an error. This is the same in Chrome using the Developer Tools.
Since the tool allows me to generate the file for Android, I installed the app in my Samsung Galaxy SII and Nexus 7. It works perfectly there!
I think it must be a problem with PhoneGap. Is there any tool for debugging the app on the iPad (not within Xcode)?

If relevant logs are being generated, it is possible to connect the device to a Mac and see the general console, where you'll see these logs (amongst many other system related events)

I downloaded and installed Safari for Windows and found the bug. Unfortunately there´s no version 6 for Windows so that I can use the newest developer tools.

Is it possible with Weinre to set javascript breakpoints when debugging iOS webviews

I'm using weinre to debug a phonegap application. However it doesn't seem possible to step through the JS or set breakpoints. Is this at all possible?

No, it is not possible to set breakpoints with weinre.

No is the correct answer. And the "secret XCode UIWebView" mentioned in the other answer doesn't work any more. BUT ...
You can now throw the Weinre out the window because, with the release of iOS 6, Apple released remote mobile Web Inspector for Safari, and this is HUGE for anyone who's been struggling to debug their iOS mobile apps. Basically you have all the features and power of regular Safari Web Inspector--including Breakpoints--for your mobile apps, including WebView & Phonegap apps. I've used weinre quite a bit, and this makes it completely obsolete for these purposes, since the new remote Web Inspector is a full-featured, native debugger.
Here's how it works (requires a Mac, xCode 4.5+ running an iOS 6 simulator (or an attached iOS 6 device, I think), and Safari 6+ on your Mac:
In your ios6 simulator/device, Settings --> Safari --> Advanced --> Web Inspector --> On (this is On by default in the simulator).
In Safari, access iPhone/iPad Simulator from the Develop menu and see your page. You can enable the Develop menu in Safari's Advanced Preferences if you don't see it.
More discussion at the bottom of: http://www.mobilexweb.com/blog/iphone-5-ios-6-html5-developers

even if this an old question, maybe someone is still struggling with iOS debugging from windows (as i was until today...:D).
I found this quite good solution:
https://www.genuitec.com/products/gapdebug/
You can install apps from ipa and debug all the code usually obfuscated by Safari.