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tag.update()

This feature add a "send from backend to frontend" capacity, which can only work with Runners which have a "permanent connexion" with front end (think websocket)

Note that this feature will not work, in this cases:

  • When the Runner is in http_only mode (because this feature use websocket only) !
  • With PyWebView runner, because pywebview doesn't support async things.

It opens a lot of powers, and real time exchanges (see examples/new_*.py) ! and works for htagweb & htagapk too.

Use cases

tag.update() is a coroutine, so you should use it in a coroutine only. It returns True/False depending on the capacity to update in realtime. (with http's runners : it will always return False)

Here is an async method of an htag component (runned with a asyncio.ensure_future( self.do_something() )): 

    async def do_something(self):
        self += "hello"
        isUpdatePossible = await self.update()

Note that, the "first updates" can return False, while the websocket is not really connected. And will return True when it's done.