Update dropdown Semantic UI component

Change the value of a dropdown_input input on the client.

Usage

update_dropdown_input(
  session,
  input_id,
  choices = NULL,
  choices_value = choices,
  value = NULL
)

Arguments

session

The session object passed to function given to shinyServer.

input_id

The id of the input object

choices

All available options one can select from. If no need to update then leave as NULL

choices_value

What reactive value should be used for corresponding choice.

value

A value to update dropdown to. Defaults to NULL.

• a value from choices updates the selection

• character(0) and "" clear the selection

• NULL:

  • clears the selection if choices is provided

  • otherwise, NULL does not change the selection

• a value not found in choices does not change the selection

Examples

if (interactive()) {
  library(shiny)
  library(shiny.semantic)

  ui <- semanticPage(
    title = "Dropdown example",
    dropdown_input("simple_dropdown", LETTERS[1:5], value = "A", type = "selection multiple"),
    p("Selected letter:"),
    textOutput("selected_letter"),
    shiny.semantic::actionButton("simple_button", "Update input to D")
  )

  server <- function(input, output, session) {
    output$selected_letter <- renderText(paste(input[["simple_dropdown"]], collapse = ", "))

    observeEvent(input$simple_button, {
      update_dropdown_input(session, "simple_dropdown", value = "D")
    })
  }

  shinyApp(ui, server)
}