How to repeat the same input UI element twice? (Two UI elements for one `input$` variable)

shiny
,
1

For example, if I wanted to have

selectInput("carDropdown", "Variable:",
                c("Cylinders" = "cyl",
                  "Transmission" = "am",
                  "Gears" = "gear"))

But I want that dropdown to appear in two separate places in the app (and when the user changes one, the other will automatically update since they are representing the same input$carDropdown variable).

I want to do this because I need to repeat a dropdown across two tabs, but it is a very complicated selectizeInput using reactive elements and I do not want to repeat all the code twice.

2

Do you know about Shiny modules? It's a piece of functionality that contains a UI and a server part that can be re-used. Every time you add a module to your app, it needs to have an unique ID, since you can't have 2 elements in your app with the same ID.
So you would need some additional code to keep the two instances in sync.

3

Try to create two separate UIs with different ids and then use updateSelectInput in the server with an observer that updates the other UI. So you have two observeEvents(input$ui1) and observeEvents(input$ui2) and then you update UI2 and ui1 in each observer

4

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