RDocumentation: colourInput

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if(!require('shinyjs')) {
    install.packages('shinyjs')
    library('shinyjs')
}

if (interactive()) {
  shiny::shinyApp(
    ui = shiny::fluidPage(
      shiny::div("Selected colour:",
                 shiny::textOutput("value", inline = TRUE)),
      colourInput("col", "Choose colour", "red"),
      shiny::h3("Update colour input"),
      shiny::textInput("text", "New colour: (colour name or HEX value)"),
      shiny::selectInput("showColour", "Show colour",
        c("both", "text", "background")),
      shiny::checkboxInput("allowTransparent", "Allow transparent", FALSE),
      shiny::actionButton("btn", "Update")
    ),
    server = function(input, output, session) {
      shiny::observeEvent(input$btn, {
        updateColourInput(session, "col",
          value = input$text, showColour = input$showColour,
          allowTransparent = input$allowTransparent)
      })
      output$value <- shiny::renderText(input$col)
    }
  )
}