Writing to companion's javascript console

davidefa · February 13, 2026, 4:57pm

The notifier.log is able to log on the adb console but also on the companion's javascript console, which I find handy, the only point is that 4 lines are written each time ( which seems too much ; - ), so wondering: is it possible to write directly to the companion's javascript console?

Kumaraswamy · February 13, 2026, 5:25pm

Hello. Why would you want to do that? That is not possible. But you have a better option, i.e. the Debug Panel:

Logs are also sent over WebRTC to the IDE.

Check out Notifier's LogInfo block:

    if (form.isRepl()) {
      RetValManager.appendLogValue(message, "Notifier", "OK", "Info");
    }

github.com

mit-cml/appinventor-sources/blob/master/appinventor/components/src/com/google/appinventor/components/runtime/Notifier.java#L574


      
              if (form.isRepl()) {
                RetValManager.appendLogValue(message, "Notifier", "OK", "Warning");
              }
            }
          
            /**
             * Writes an information message to the Android log.
             *
             * @param message the information message
             */
            @SimpleFunction(description = "Writes an information message to the Android log.")
            public void LogInfo(String message) {
              Log.i(LOG_TAG, message);
              if (form.isRepl()) {
                RetValManager.appendLogValue(message, "Notifier", "OK", "Info");
              }
            }
          }

davidefa · February 13, 2026, 5:42pm

Sorry, my mistake, I should have written: "in the javascript console of the browser where is app inventor's editor".
But the debug panel ( you showed ) is exactly what I was looking for.
Didn't even know it existed ( also not sure the notifier documentation mention this ).
Thanks