does async callback supported？ #41

Activity

1. AlbertShown commented on Sep 26, 2025

   

   AlbertShown

   on Sep 26, 2025

   Last edited by AlbertShown

   Member

   More actions

   WebUI supports it, it's implemented by default in some wrappers like Deno-WebUI because everything is async, but in Python-WebUI I think it should be done manually.

   To make your WebUI project support async try this:

   1 - initialize WebUI with async enabled

   # in your main start, initialize WebUI with async enabled
   # Config.asynchronous_response = number 5
   # More info: 
   # https://github.com/webui-dev/python-webui/blob/c4b55892baa9367dd7cd4005ab30542e81f954b4/PyPI/Package/src/webui/webui.py#L116
   
   set_config(Config.asynchronous_response, True)
   
   # Now, WebUI events will bypass the callback instant return, and wait forever for the async response trough any `e.return_xxx()`

   2 - Set your event async response

   # In your events call, make sure to call any `e.return_xxx()` to set your async response to the UI
   
   def myCallbackExample(e : webui.Event):
         # do your async operations...
         # Python may return right away a void response to C (WebUI), but WebUI will ignore it and wait for any `e.return_xxx()`
         e.return_int(123) # Now WebUI will pass the response to UI.

   👍React with 👍1Reacted by Cong Zhang
2. congzhangzh commented on Sep 26, 2025

   

   congzhangzh

   on Sep 26, 2025

   Author

   More actions

   Tks, Btw how you guys stop asyncio event loop from blocking, as main thread is waiting?

   webui.wait()

   I am the author of https://github.com/congzhangzh/webview_python , to make wait work, I even monkey patch python asyncio, like:

   https://github.com/congzhangzh/webview_python/tree/main/examples/async_with_asyncio_guest_run
3. congzhangzh commented on Sep 26, 2025

   

   congzhangzh

   on Sep 26, 2025

   Author

   More actions

   use multi thread?
4. AlbertShown commented on Sep 29, 2025

   

   AlbertShown

   on Sep 29, 2025

   Member

   More actions

   this project structure is different from your project structure because this one calls a C external library, while yours is directly using webview.

   However, code is here:
   https://github.com/webui-dev/python-webui/blob/c4b55892baa9367dd7cd4005ab30542e81f954b4/PyPI/Package/src/webui/webui.py#L1544C5-L1544C22

   ❤️React with ❤️1Reacted by Cong Zhang