Aan de slagGa gratis aan de slag

Select a continent to view

When exploring a dataset, it is often useful to experiment with filtering more than one variable. For example, you might be interested in only seeing data for African countries that had a specific life expectancy.

Deze oefening maakt deel uit van de cursus

Case Studies: Building Web Applications with Shiny in R

Cursus bekijken

Oefeninstructies

Add a select input that allows the user to select a specific continent to view. Specifically:

  • Add a select input to the UI with ID "continent" and a label of "Continent".
  • Inside the render function, use the continent input value to only select data from the chosen continent (line 21).

Praktische interactieve oefening

Probeer deze oefening eens door deze voorbeeldcode in te vullen.

ui <- fluidPage(
  h1("Gapminder"),
  sliderInput(inputId = "life", label = "Life expectancy",
              min = 0, max = 120,
              value = c(30, 50)),
  # Add a continent selector dropdown
  ___(___, ___, choices = levels(gapminder$continent)),
  tableOutput("table")
)

server <- function(input, output) {
  output$table <- renderTable({
    data <- gapminder
    data <- subset(
      data,
      lifeExp >= input$life[1] & lifeExp <= input$life[2]
    )
    data <- subset(
      data,
      # Filter the data according to the continent input value
      continent == ___
    )
    data
  })
}

shinyApp(ui, server)
Code bewerken en uitvoeren