Add a slider input to select year
Slider inputs are great for numeric inputs, both when you'd like users to choose from a range of values and also when they should choose a static value from a set of options, but you want to be more creative than using a selectInput().
Adjust your app displaying top 10 names for a year by adding a slider to select a specific year available in babynames.
Diese Übung ist Teil des Kurses
Building Web Applications with Shiny in R
Anleitung zur Übung
- Add a slider input named "year" to let users select a year between 1900 and 2010, with a default of 1900.
- Update server code to get the top 10 names for the selected year instead of 1900 only
Interaktive Übung
Versuche dich an dieser Übung, indem du diesen Beispielcode vervollständigst.
ui <- fluidPage(
titlePanel("What's in a Name?"),
# Add select input named "sex" to choose between "M" and "F"
selectInput('sex', 'Select Sex', choices = c("F", "M")),
# CODE BELOW: Add slider input named 'year' to select years (1900 - 2010)
# Add plot output to display top 10 most popular names
plotOutput('plot_top_10_names')
)
server <- function(input, output, session){
# Render plot of top 10 most popular names
output$plot_top_10_names <- renderPlot({
# Get top 10 names by sex and year
top_10_names <- babynames %>%
filter(sex == input$sex) %>%
# MODIFY CODE BELOW: Filter for the selected year
filter(year == 1900) %>%
slice_max(prop, n = 10)
# Plot top 10 names by sex and year
ggplot(top_10_names, aes(x = name, y = prop)) +
geom_col(fill = "#263e63")
})
}
shinyApp(ui = ui, server = server)