observeEvent for dynamic list

I can write a handler for multiple static sources:

  observeEvent(list(input$surname, input$firstname), {

What is the syntax, when I have a dynamic list generated from a database, something like (fails)

myfields = list("firstname", "surname")
observeEvent(input[[myfields]], ....)

And how do I find the input field(s) that actually changed in the handler?

I would create an intermediate reactive value using reactive. And look into using observe to set multiple values at once.

I've made a lot of guesses below, but hopefully it can get you on the right track.

dynamic_data <- reactive({

val1 <- reactiveVal()
val2 <- reactiveVal()

  dt <- dynamic_data()
  req(!is.null(dt)) # require data to exist

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