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I remember having used an option setting that enable to print in the R console the messages between the server and ui while a shiny app is running. This option is really useful to understand what is happening in the app. However I cant remember the name of that option and can not find it anymore in the documentation. Can someone can tell what is that option ? Thanks!
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Shiny applications have two components, a user interface object and a server function, that are passed as arguments to the shinyApp function that creates a Shiny app object from this UI/server pair.
Shiny uses the function fluidPage to create a display that automatically adjusts to the dimensions of your user's browser window. You lay out the user interface of your app by placing elements in the fluidPage function.
I finally found it :
options(shiny.trace=TRUE) Before running the app. I find it extremely useful to understand what is appending. I don't know why it is not more documented.
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R Studio lists a nice summary of R Shiny global options available here
You may wish to turn both of these on: options(shiny.trace=TRUE) options(shiny.fullstacktrace=TRUE)
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