Update Tree Input

Update treeInput() from server.

updateTreeInput(
  inputId,
  label = NULL,
  selected = NULL,
  session = shiny::getDefaultReactiveDomain()
)

Arguments

inputId

The id of the input object.

label

The label to set for the input object.

selected

The values that should be initially selected, if any.

session

The session object passed to function given to shinyServer. Default is getDefaultReactiveDomain().

Value

No value.

Examples

library(shiny)
library(shinyWidgets)

# data
cities <- data.frame(
  continent = c("America", "America", "America", "Africa",
                "Africa", "Africa", "Africa", "Africa",
                "Europe", "Europe", "Europe", "Antarctica"),
  country = c("Canada", "Canada", "USA", "Tunisia", "Tunisia",
              "Tunisia", "Algeria", "Algeria", "Italy", "Germany", "Spain", NA),
  city = c("Trois-Rivières", "Québec", "San Francisco", "Tunis",
           "Monastir", "Sousse", "Alger", "Oran", "Rome", "Berlin", "Madrid", NA),
  stringsAsFactors = FALSE
)

# app
ui <- fluidPage(
  tags$h2("updateTreeInput() example"),
  fluidRow(
    column(
      width = 6,
      treeInput(
        inputId = "ID1",
        label = "Select cities:",
        choices = create_tree(cities),
        returnValue = "text"
      ),
      verbatimTextOutput("res1")
    ),
    column(
      width = 6,
      textInput(
        inputId = "label",
        label = "Update label:",
        value = "Select cities:"
      ),
      checkboxGroupInput(
        inputId = "val_country",
        label = "Select countries:",
        choices = unique(cities$country),
        inline = TRUE
      ),
      checkboxGroupInput(
        inputId = "val_city",
        label = "Select cities:",
        choices = unique(cities$city),
        inline = TRUE
      ),
      actionButton("clear", "Clear selected")
    )
  )
)

server <- function(input, output, session) {

  output$res1 <- renderPrint(input$ID1)

  observe(
    updateTreeInput(inputId = "ID1", label = input$label)
  )

  observeEvent(
    input$val_country,
    updateTreeInput(inputId = "ID1", selected = input$val_country)
  )

  observeEvent(
    input$val_city,
    updateTreeInput(inputId = "ID1", selected = input$val_city)
  )

  observeEvent(input$clear, {
      updateTreeInput(inputId = "ID1", selected = character(0))
      updateCheckboxGroupInput(inputId = "val_country", selected = character(0))
      updateCheckboxGroupInput(inputId = "val_city", selected = character(0))
    }
  )
}

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