Description

I am using pywebview to display the Streamlit app that includes an OAuth2 button. The button relies on window.open to open an external popup. While this works perfectly in a standard browser (Chrome/Edge), it fails when the app is embedded in pywebview.

Why pywebview?

I chose pywebview to bundle my Streamlit app into a lightweight desktop application with a native window experience.

Problem

When the button is clicked, window.open fails inside pywebview. The following error appears in the developer console:

Unhandled Promise Rejection: TypeError: null is not an object (evaluating 'r.focus')

I tried replacing window.open with window.location.href = jr; as a workaround, but this results in another issue:

Failed to load resource: the server responded with a status of 403 (Forbidden)

I am not proficient in JavaScript, so I wasn’t able to debug this further.

Steps to Reproduce

1. Run the following Python code to open the Streamlit app in pywebview:

   import webview
   
   if __name__ == "__main__":
       window = webview.create_window(
           "OAuth2 Window",
           url="http://localhost:8501",
       )
       webview.start()

Related Issues in pywebview

This seems to be related to pywebview’s known limitation where window.open is not supported:

• pywebview issue #317

Suggested Fix

It would be great if the streamlit_oauth library could detect environments like pywebview where window.open is unsupported and provide an alternative mechanism, such as navigating directly to the OAuth URL with window.location.href.