Android Question Try to catch exception for javascript CallSub

your amount of parameters does not match.
in cmd01 you have 5 parameters
in cmd2 3. This is the maximum allowed parameters.

See
Here you can see all possible variants you can use.

DonManfred said:

your amount of parameters does not match.
in cmd01 you have 5 parameters
in cmd2 3. This is the maximum allowed parameters.

See

WebViewExtras

Hi all. WebViewExtras is my latest library. It's a much updated version of JSInterface. WebViewExtras exposes more of the available native Android WebView methods to your B4A application: addJavascriptInterface(webView1 As WebView, interfaceName As String) Add a javascript interface to...

www.b4x.com

Here you can see all possible variants you can use.

Click to expand...

Sorry, that is not my question.

In b4a, I defined a sub "test1" with 3 parameters so the javascript in html in my webview can do b4a.CallSub("test1", True, "p1", "p2","p3").

It is ok to call with 3 parameters. But as the html is dynamically generated and there will be mistakes so it may call with less than 3 parameters.
e.g. it calls with one parameter then crash the app.

I don't want the app to crash but instead prompt warning. Is there any way?

I can not answer this. I do not use javascript, do not use webviews and do not wrote the library.

See the page linked: you CAN use one parameter.
one, two or three parameters are possible.

Maybe wait for someone who is familar with javascript and the javascriptinterface.

You must catch onConsoleMessage event from WebChromeClient and return true to handle exception.

Ivica Golubovic said:

You must catch onConsoleMessage event from WebChromeClient and return true to handle exception.

Click to expand...

Thanks, will try that out.