Select/Deselect All Button for shiny variable selection

Question

I have this statement that lets me get basic descriptive statistics about my variables:

checkboxGroupInput(\'show_vars\', \'Columns in diamonds to show:\',
              


        

Answer 1

This is how I set up a select/deselect all button.

In ui.R add an action button where needed:

actionButton("selectall", label="Select/Deselect all")

Then server.R uses updateCheckboxGroupInput based on the condition of the action button. If the number of times the button is pressed is even it will select all, else if it's odd it will select none.

# select/deselect all using action button

observe({
  if (input$selectall > 0) {
    if (input$selectall %% 2 == 0){
      updateCheckboxGroupInput(session=session, 
                               inputId="show_vars",
                               choices = list("carat" = "carat",
                                              "cut" = "cut",
                                              "color" = "color",
                                              "clarity"= "clarity",
                                              "depth" = "depth",
                                              "table" = "table",
                                              "price" = "price",
                                              "x" = "x",
                                              "y" = "y",
                                              "z" = "z"),
                               selected = c(names(hw)))

    } else {
      updateCheckboxGroupInput(session=session, 
                               inputId="show_vars",
                               choices = list("carat" = "carat",
                                              "cut" = "cut",
                                              "color" = "color",
                                              "clarity"= "clarity",
                                              "depth" = "depth",
                                              "table" = "table",
                                              "price" = "price",
                                              "x" = "x",
                                              "y" = "y",
                                              "z" = "z"),
                               selected = c())

    }}
})

The full app for your example below - you'd need to add session to the server function, I added a condition for renderDataTable when no variables are selected.

library(shiny)
library(ggplot2)
data(diamonds)
hw <- diamonds

runApp(
  list(
    ui=(
      fluidPage(
        title = 'Examples of DataTables',
        sidebarLayout(
          sidebarPanel(
            actionButton("selectall", label="Select/Deselect all"),
            checkboxGroupInput('show_vars', 'Columns in diamonds to show:',
                               names(hw), selected = names(hw))

          ),
          mainPanel(
            verbatimTextOutput("summary"),
            tabsetPanel(
              id = 'dataset',
              tabPanel('hw', dataTableOutput('mytable1'))
            ))))),

    server = (function(input, output, session) {
      output$summary <- renderPrint({
        dataset <- hw[, input$show_vars, drop = FALSE]
        summary(dataset)
      })
      observe({
        if (input$selectall > 0) {
          if (input$selectall %% 2 == 0){
            updateCheckboxGroupInput(session=session, inputId="show_vars",
                                     choices = list("carat" = "carat",
                                                    "cut" = "cut",
                                                    "color" = "color",
                                                    "clarity"= "clarity",
                                                    "depth" = "depth",
                                                    "table" = "table",
                                                    "price" = "price",
                                                    "x" = "x",
                                                    "y" = "y",
                                                    "z" = "z"),
                                     selected = c(names(hw)))

          }
          else {
            updateCheckboxGroupInput(session=session, inputId="show_vars",
                                     choices = list("carat" = "carat",
                                                    "cut" = "cut",
                                                    "color" = "color",
                                                    "clarity"= "clarity",
                                                    "depth" = "depth",
                                                    "table" = "table",
                                                    "price" = "price",
                                                    "x" = "x",
                                                    "y" = "y",
                                                    "z" = "z"),
                                     selected = c())

          }}
      })

      # a large table, reative to input$show_vars
     output$mytable1 <- renderDataTable({
        if (is.null(input$show_vars)){
          data.frame("no variables selected" = c("no variables selected"))
        } else{
          hw[, input$show_vars, drop = FALSE]
        }

      })
    })

  ))