Recent Android Webview update breaks Javascript in Tasker

[Tony]

I have a tasker task that uses javascript to perform some operations based on certain conditions.  Recently my task stopped working for no reason, I could even take the same javascript code and run it on my computer and it works great.

What I found was the recent update of Android Webview on March 30, 2015 has impacted my javascript task in some way.  I was able to prove this by uninstalling Android Webview and my javascript task worked flawlessly.

My setup:

Nexus 5 on 5.1

Tasker 4.6u3m

[Pent]

Just installed 5.1 this morning, will get back to you after testing.

Pent

[Pent]

I installed the latest WebView from Google Play and tested a script without problem.

Could you please post the exported XML of the task with the script (please simplify as much
as possible first...)

Pent

[Tony]

Sorry for late response I have been at work all day.  The only thing I can figure is that I am doing synchronous XMLHttpRequest requests and maybe the newer webview has completely deprecated those types of calls.

I can't provide you my current JS file since its basically just communicating with my home computer, but I will see if I can put together an example piece of code that reproduces the issue. 

[Pent]

Sorry for late response I have been at work all day.  The only thing I can figure is that I am doing synchronous XMLHttpRequest requests and maybe the newer webview has completely deprecated those types of calls.

Well if that's the case, I don't think there's anything I can do about it, I have no influence over what's provided in the WebView environment. Perhaps
it's available via an external library you could include (I'm not a JS programmer BTW....)

Pent

[Tony Meszaros]

I was actually able to test the synchronous XMLHttpRequest item by making a simple test a weather API I found.  Tasker and the updated Webview item appeared to still work with the simple example.

I sent you the task xml you requested privately.  Let me know if I need to send it again.

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[Pent]

I was actually able to test the synchronous XMLHttpRequest item by making a simple test a weather API I found.  Tasker and the updated Webview item appeared to still work with the simple example.

Then what's not working ?

Best plan would be you pare your script down till you find out what's not working.

Pent

[Pent]

You sent me the task but not the script.

Pent

[Tony]

Sorry for the delay. Here are the JS files.

[Pent]

Thanks, and sorry for the delay.

There are two things going on.

1) a bug in Tasker where a warning from the JS engine caused script execution to stop
2) this warning from the engine: Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check http://xhr.spec.whatwg.org/.

Pent

[Pent]

p.s. JS warning bug fixed in latest beta I just uploaded (see top of forum sticky)

Pent