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Custom logic

Custom logic

2026-07-09

When saving your modifications, eDT will just update the data hereby only checking the data types and foreign tables. Sometimes however, you might want some specific custom behavior or extra checks that editbl doesn’t support out of the box. There are two main solutions to write custom logic for the modifications that were made.

library(shiny)
library(editbl)

Option 1

Add your own implementations for e_rows_update(), e_rows_insert() and/or e_rows_delete. This is arguably the most flexible approach since it nicely integrates with the behavior of eDT.

ui <- fluidPage(eDTOutput("DT"))

# Define a custom update function
e_rows_update.mtcars <- function(
    x,
    y,
    by = NULL,
    ...,
    match = match,
    unmatched = c("error", "ignore"),
    copy = FALSE,
    in_place = FALSE){      
        
        # Extra checks
        if(any(y[,"mpg"] < 0)){
            stop("mpg should be a positive value!") 
        }
        
        # Logging
        print("Updated rows:")
        print(y)
        
        # Drop extra class and execute default code
        class(x) <- class(x)[class(x) != 'mtcars']
        e_rows_update(
          x = x,
          y = y,
          by = by,
          ... ,
          match = match,
          unmatched = unmatched,
          copy = copy,
          in_place = in_place
      )
    }

server <- function(input, output, session){
    
    # Add a new class to your data object
    df = tibble::tibble(mtcars)
    class(df) <- c("mtcars", class(df))

      result = eDT(
        id = "DT",
        data = df
    )
       
}
shinyApp(ui, server)
Shiny applications not supported in static R Markdown documents

Option 2

You can capture the modifications made by editbl and handle them downstream in the app. This is more straightforward, but doesn’t support adding any logic before saving.

ui <- fluidPage(eDTOutput("DT"))

server <- function(input, output, session){
      result = eDT(
        id = "DT",
        data = mtcars
      )
      
      # Some logging
      observe({
        print('These rows have been permanently deleted:')
        print(result$deleted())
      })
       
}
shinyApp(ui, server)
Shiny applications not supported in static R Markdown documents

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