Hello all, I’m building a monitoring app with Dash for the observatory I’m working at. An essential component of this monitoring is to send alarms if some parameters are not ok with what they should be. For this, I’m using a dcc.Interval to do regular checks and, if not okay, an alarm is send via …

Hello @Aprots You could use an id for the alarm and verify if it needs to send it again, just update a small db with the id of the alarm and whether or not it was triggered. If so, ignore the duplicates.

That sounds like a good workaround, thanks for your input, I’ll work in this direction then.

I would have another question. If I understand correctly how dash works, when starting the server, it will get “GET” or “POST” requests from the client started in a browser. Is there a way to have the server to send a notification to all connected clients ? For example, the user would have the pos…

You are looking into the realm of websockets, which is supported very soon natively by Dash. Essentially, it allows the server to push data to the client whenever it wants to.

That’s exactly what I’m looking for, thanks for the quick answer. Is there a timeline on this ? I will work with some status files to read as a temporary solution.

Hi @Aprots There is a pre-release available now: dash 4.2.0rc3. The docs are being worked on currently and should be available soon. If you want to get a head start, you can find that release on this branch GitHub - plotly/dash at v4.2 · GitHub

Thank you @AnnMarieW , I managed to upgrade to v4.2.0rc3. I will try to have a look eventhough I don’t think my python skills are advanced enough to work without the docs.

hi @Aprots The docs will be out very soon, like Ann Marie said. Thank you for upgrading to the release candidate. Feel free to ask more questions here in forum if you get stuck in the future.

@Aprots The new docs for websockets are now available: WebSocket Callbacks | Dash for Python Documentation | Plotly Use WebSocket callbacks in Dash for real-time streaming, live progress updates, and reading component state mid-callback. Requires Dash 4.2+ with FastAPI. …

That is great news, thank you very much ! I will get to work then !

Interval timer on several instances of web interface

Dash Python

AnnMarieW June 5, 2026, 8:26pm 10

@Aprots

The new docs for websockets are now available:

Topic		Replies	Views
dcc.Interval duplicate runs Dash Python	2	799	February 9, 2020
Server side updation along with interval component Dash Python	5	2534	February 25, 2022
How to make a Dash Interval Run consistently in the background Dash Python question	2	582	December 13, 2022
Time limitation for dcc.Intervall Dash Python	4	421	March 26, 2024
Multiple interval object in a single page Dash Python	4	2730	September 12, 2017

Interval timer on several instances of web interface

Related topics