error_on: Error on Function

In shinyGovstyle: Custom Gov Style Inputs for Shiny

Error on Function

Description

This function turns on the error for the component. Can be used to validate inputs.

Usage

error_on(inputId, error_message = NULL)

Arguments

inputId	The input id that you to to turn the error on for
error_message	if you want to add an additional error message Defaults to NULL, showing the original designed error message

Value

no return value. This toggles on error CSS

See Also

Other Govstyle errors: error_off(), error_summary(), error_summary_update()

Examples

ui <- shiny::fluidPage(
  # Required for error handling function
  shinyjs::useShinyjs(),
  shinyGovstyle::header(
    org_name = "Example",
    service_name = "User Examples",
    logo="shinyGovstyle/images/moj_logo.png"
  ),
  shinyGovstyle::banner(
    inputId = "banner", type = "beta", 'This is a new service'
  ),
  shinyGovstyle::gov_layout(size = "two-thirds",
    # Error text box
    shinyGovstyle::text_Input(
      inputId = "eventId",
      label = "Event Name",
      error = TRUE),
    # Button to trigger error
    shinyGovstyle::button_Input(inputId = "submit", label = "Submit")
  ),
  shinyGovstyle::footer(full = TRUE)
)

server <- function(input, output, session) {
  # Trigger error on blank submit of eventId2
  observeEvent(input$submit, {
    if (input$eventId != ""){
      shinyGovstyle::error_off(inputId = "eventId")
    } else {
      shinyGovstyle::error_on(
        inputId = "eventId",
        error_message = "Please complete"
      )
    }
  })
}

if (interactive()) shinyApp(ui = ui, server = server)

shinyGovstyle documentation built on April 13, 2026, 5:06 p.m.