Just curious, why is this a requirement? You have already assigned a callback to the output with ID "some_id" and property "value". An output can only have a single callback function. Try combining your inputs and callback functions together into one function assume as a sketch example I have htm…

[image] ziczac: Sometimes there are expensive computations that are only necessary when a particular input changed. For now, see Dash Documentation & User Guide | Plotly for some strategies to store the result of the computations instead of re-recomputing it. Otherwise, I’m hoping we’ll find…

Thanks. That would be greatly appreciated. I like to allow users to click on charts and propagate that information to other graphs, quite often n-to-1, so keeping track of the history to determine which clickdata is updated is a bit tedious and would be extremely elegant and simple wiht multiple out…

I ran into the same problem. I have background in native app development and am new to web development. I have this use case where there are two views I want to toggle in the same nested html.Div. When user clicks a button in the first view, the Div switches to contain the second view with different…

Ok, just read through the FAQ and Gotchas page https://dash.plot.ly/faqs . So looks like the workaround for me is to disable callback validation, and I’ll pretty much end up with a big callback with a big list of inputs and update a big number of components unnecessarily, and hiding information in hi…

I agree it will be a complete game changer. Because now it forces you to use some hacks instead of correct design patterns.

[image] chriddyp: It’s just a matter of development effort. We’d like to add multiple outputs soon. is this available now?

Instead of assigning the same output object to different callbacks you can create a single callback with multiple inputs. Inside of that callback you can determine which control triggered the callback as is described in this FAQ: https://dash.plot.ly/faqs (i.e. dash.callback_context.ctx.triggered[0…

[image] nifrick: Inside of that callback you can determine which control triggered the callback as is described in this FAQ: FAQs | Dash for Python Documentation | Plotly (i.e. dash.callback_context.ctx.triggered[0][‘prop_id’].split(’.’)[0]) exactly :+1: this is the recommended pattern right …

I would like to use this functionality to create a kind of ‘event bus’, where many callbacks would be able to make calculations, send the results to many outputs (which is currently possible) and also to a single output which is the hub responsible for displaying feedback to the user. More practica…

I agree that callbacks with shared outputs would be a giant step forward for Dash. Combining all inputs affecting to one output results in messy code, and is certainly more error prone than dividing the code into smaller logical blocks. This issue has been discussed in #153 by @chriddyp , @alexcjohn…

Why can an output only have a single callback function?

Dash Python

nicolaskruchten August 31, 2021, 2:54pm 18

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Why can an output only have a single callback function?

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