Implement exceptions.PreventUpdate #25

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1. cpsievert

   added this to the dasher releaseThis milestone has been deleted milestone on Jan 19, 2018
2. cpsievert

   added

   enhancement

   on Apr 20, 2018
3. rpkyle commented on Jul 15, 2019

   

   rpkyle

   on Jul 15, 2019

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   @nicolaskruchten @alexcjohnson I was talking with @KPhans not that long ago, and he asked whether this was on the list of features to support. We haven't discussed this item specifically.

   It exists in Dash for Python, so I am assuming that it is?
4. alexcjohnson commented on Jul 15, 2019

   

   alexcjohnson

   on Jul 15, 2019

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   Definitely should be on the list. Also see dash.no_update plotly/dash#680 which is only strictly necessary when we get to multi outputs but is a nice alternative to raising an error even for single outputs.
5. rpkyle

   self-assigned this

   on Aug 1, 2019
6. rpkyle commented on Aug 1, 2019

   

   rpkyle

   on Aug 1, 2019

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   Definitely should be on the list. Also see dash.no_update plotly/dash#680 which is only strictly necessary when we get to multi outputs but is a nice alternative to raising an error even for single outputs.

   We discussed the implementation of PreventUpdate in R, and I believe the initial plan is to use something like no_update. I'm working on that today, will attempt to draft a PR by tomorrow.
7. rpkyle

   closed this as completedin #111on Aug 13, 2019