Broadcast or share reactive state between pages in multipage app

[HugoP]

Hi,

I have used two of the examples to help with creating a multipage live update app.

Live Update and Multiple scripts

The live part of the app is working by subscribing to a MQTT topic and parsing the payload before rendering the live data.

Is there a way to broadcast or inform another page in the app when a new topic has arrived and render the new value on the that page?

At the end of the day the required data ends up in a PostgreSQL database and the MQTT subscribe topic acts like a heart beat to inform the app that new data is available.

Kind regards

[HugoP]

Looks like this might be the trick.

Examples
Building Your First Python Package: A Step-by-Step Guide
How to Build a Complete Python Package Step-by-Step

It's tough being a noob!

[maartenbreddels]

Hi Hugo,

I guess you moved on, but this example

• https://solara.dev/apps/multipage

Show an example of a reactive variable that is used my multiple pages, see source:

• https://github.com/widgetti/solara/blob/master/solara/website/pages/apps/multipage/__init__.py

I hope that still helps or future users.

Regards,

Maarten

[HugoP]

Hi @maartenbreddels ,

Thanks for the reply.

I seem to have missed that example and followed this approach

solara create button multipage-demo/01-click-button.py
solara create markdown multipage-demo/02-markdown-editor.py
solara run ./multipage-demo

Your example looks like a simpler way of doing what I need.

Regards
Hugo

[HugoP]

I made a copy of just the multipage folder from the github repo to start using it as a example and running it like so:

solara run ./multipage

But I'm getting errors

from . import SharedComponent
ImportError: attempted relative import with no known parent package
(.venv) root@host:~/code/solara_play$ solara run ./multipage --host=172.26.1.205

PS. I would really like to use the init.py file technique to turn a folder into a package and it works on other tests I have done when solara is not involved.

What am I doing wrong?

Regards
Hugo

[iisakkirotko]

Hey @HugoP! If you already have your app installed as a package, you can run it using solara run multipage. Note that you shouldn't make the argument a path with ./. Sometimes it also helps to have your app in a subdirectory (./multipage/app) and then run it with solara run multipage.app, but that depends on the rest of your package structure.