moduleBasics.txt

How Modules work:

  We have a bit of code we want to repeat in several parts of an R SHiny app.
  
  Build two functions in  global.R file
  
  verbUI <- function(id){
    ns <- NS(id)
   ## this holds the parts to repeat using ns("parts2refer2") 
   ## for example, define a user input here naming in ns("myInput")
  }
  
  verb <- function(input, output, session, otherArgs, ie, reactive(input$checkbox) ){
  
    ## what to do on the server end
    ## input$parts2refer2  references the pieces in verbUI
    ## return a list of reactive expressions
  }
  
  In ui.R refer to the module as
  
  verbUI("name4thisInstance")  ##  placement: where you want to see the UI appear
  
  
  In server.R use callModule
  
  newVerbFunction <- callModule(verb, "name4thisInstance", args)
  
  Now grab the module output with
  name4thisInstance()