ExecuteJS() not working even after page is fully loaded

[Andrea88]

Hi,
I’m currently trying to get JavaScript communication working using your plugin, but I’m facing a blocking issue: the InAppBrowser.ExecuteJS() call doesn’t seem to execute any code inside the WebView.

Here’s a full recap of what I’ve tried and confirmed:

What works:
Communication from JS to Unity using window.Unity.call() works as expected.

The onJSCallback in Unity correctly receives the message (e.g. “ping”).

I also receive the onBrowserFinishedLoading event properly.

What doesn’t work:
The method InAppBrowser.ExecuteJS(“alert(‘pong!’)”); never triggers any visible JS behavior (no alert, no console.log, no DOM change).

I’ve tried placing the JS execution inside the onBrowserFinishedLoading callback, like this:

bridge.onBrowserFinishedLoading.AddListener((string url) => {
Debug.Log(“Browser finished loading: ” + url);
InAppBrowser.ExecuteJS(“alert(‘pong!’)”);
});
I also tried injecting JS that modifies the DOM (changing document.body.innerHTML), but again, no result.

I added the proper network_security_config and allowed cleartext traffic (android:usesCleartextTraffic=”true”), directly customizing the manifest, cause i have thinked about HTTPS security protocol… but even with this, no JS execution.

I have tested on Android Xiaomi 9T pro and in a Nothing phone 2A. In Xiaomi i can clairly see on android logcat : 2025/06/11 17:16:08.278 15376 15376 Warn ContentCatcher Failed to notify a WebView!

Thanks for the support

[Piotr]

Hi,
It would be best to debug it directly on a device. If I give you access to github project is it something you could try by yourself?

[Author]

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