How trigger a Toast from multiple callabcks

Dash Python
1

Hello all,
I have to implement the toast in the dash Python app; I have a multipage app and multiple callbacks on a single page. I am using dash-bootstrap [toast] (Toast - dbc docs) for this purpose. I have to trigger the toast whenever some condition is met or something inside the callback code occurs. So to trigger this toast we need callaback,’

So the question is: how can we trigger this toast from multiple callbacks? while Dash doesn’t allow one output in multiple callbacks. So how can I achieve this?

Note: I don’t want to create multiple toast components on one page. My callbacks are dynamically created inside a loop in accordance with the current condition.

2

You might try the multiplexer transform from das-extensions:

2 Likes
3

My app is now in production, so I don’t want to change its base structure as multiplexer do.

4

The other option is, that you merge all single callbacks which trigger the toast into one callback:

Also interesting in this context is @jinnyzor ’ s answer:

5

What do you mean by changing the structure? The changes needed are very minimal

1 Like
6

Yes, I know the changes are minimal. need to change the main Dash object. But my concern is its future support and any limitations. What’s your point on that? Is it safe?

7

yes i am also thinking this way to use dcc.Store and pattern matching.