Tree Input Widget

A tree input widget allowing to select values in a hierarchical structure.

treeInput(
  inputId,
  label,
  choices,
  selected = NULL,
  closeDepth = 1,
  returnValue = c("text", "id", "all"),
  width = NULL
)

Arguments

inputId

The input slot that will be used to access the value.

label

Display label for the control, or NULL for no label.

choices

A list of list in a tree structure, see create_tree() for examples creating the right structure.

selected

Inital selected values, note that you have to use node ID.

closeDepth

Expand level, default to only first one visible.

returnValue

Value returned server-side, default to "text" the node text, other possibilities are "id" (if no ID provided in choices = , one is generated) or "all" to returned all the tree under the element selected.

width

The width of the input, e.g. 400px, or "100%.

Value

A shiny.tag object that can be used in a UI definition.

See also

updateTreeInput() for updating from server.

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("treeInput() example"),
  fluidRow(
    column(
      width = 4,
      treeInput(
        inputId = "ID1",
        label = "Select cities:",
        choices = create_tree(cities),
        selected = "San Francisco",
        returnValue = "text",
        closeDepth = 0
      ),
      verbatimTextOutput("res1")
    ),
    column(
      width = 4,
      treeInput(
        inputId = "ID2",
        label = "Select cities:",
        choices = create_tree(cities),
        selected = "San Francisco",
        returnValue = "text",
        closeDepth = 1
      ),
      verbatimTextOutput("res2")
    ),
    column(
      width = 4,
      treeInput(
        inputId = "ID3",
        label = "Select cities:",
        choices = create_tree(cities),
        selected = c("San Francisco", "Monastir"),
        returnValue = "text",
        closeDepth = 2
      ),
      verbatimTextOutput("res3")
    )
  )
)

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

  output$res1 <- renderPrint(input$ID1)
  output$res2 <- renderPrint(input$ID2)
  output$res3 <- renderPrint(input$ID3)

}

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