UserWarning: The browser you selected might not be installed on your system #44

Activity

1. AlbertShown commented on Mar 5, 2026

   

   AlbertShown

   on Mar 5, 2026

   Last edited by AlbertShown

   Member

   More actions

   I think that's because WebUI waits for the WebSocket connection but it never come in. Can you double check that your HTML is including webui.js ?

   Since you chose to use your own web server instead of WebUI web server, then you may need this:

   Python Script:

   # Set the port that WebUI should use. This means `webui.js` will be available at:
   # http://localhost:YOUR_PORT_NUMBER/webui.js
   my_window.set_port(7070)

   HTML:

   <script src="http://localhost:7070/webui.js"></script>
2. AlbertShown commented on Mar 5, 2026

   

   AlbertShown

   on Mar 5, 2026

   Member

   More actions

   Just to let you know, in case you chose to use WebUI web server instead, then script will be something like this:

   from webui import webui
   from webui.webui import Browser
   
   my_window = webui.Window()
   my_window.set_root_folder("/home/Foo/Bar/MyWebSiteExample/")
   my_window.show_browser("index.html", Browser.Firefox)
   webui.wait()

   HTML:

   <script src="webui.js"></script>
3. aidenbell commented on Mar 5, 2026

   

   aidenbell

   on Mar 5, 2026

   Author

   More actions

   Ah this doesn't seem clear from the docs (own issue) that webui.js needs to be required in the browser instance. I was pointing it at a pre-existing Django application that spawned its own webserver.

   I added <script src="webui.js"></script> to the backend's HTML output but the issue persists. Am I right in assuming that webui.js is resolved by some magic, rather than being an actual file needed to be included? I can't find it in the repo.
4. aidenbell commented on Mar 5, 2026

   

   aidenbell

   on Mar 5, 2026

   Author

   More actions

   Edit, I got it working using the FQ localhost pointing to the webui webserver as suggested above.

   I feel like this could be better documented when "bringing your own webserver" that the webui lib has a webserver spawned for comms with the browser instance. I like the setup though.
5. AlbertShown commented on Mar 6, 2026

   

   AlbertShown

   on Mar 6, 2026

   Member

   More actions

   Ah this doesn't seem clear from the docs

   We have C own server examples, but not in Python yet, I will create one soon.

   assuming that webui.js is resolved by some magic

   The webui.js is a virtual file get generated by WebUI at runtime to get bindings list securely.