Word cloud Shiny app
You are provided with a sample dataset named artofwar, which contains the entire text of the Art of War book. You can inspect the given Art of War text by running head(artofwar) or tail(artofwar) to see the first and last few verses of the book.
As mentioned in the video, since word clouds are not an output you saw before, they require a new pair of output and render functions: wordcloud2Output() and renderWordcloud2(). These output functions are available from the wordcloud2 package.
This exercise is part of the course
Case Studies: Building Web Applications with Shiny in R
Exercise instructions
The function create_wordcloud(), the dataset artofwar, and all the necessary packages are available in your workspace.
- Add a placeholder for a word cloud output to the UI, with an outputId of
cloud. - Render the word cloud object and assign it to the correct item in the
outputlist (line 11).
By the way, create_wordcloud() is a function we defined for you. You will not be able to run it in your own RStudio on your computer. If you want to have a look at it, type create_wordcloud in the console.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Define UI for the application
ui <- fluidPage(
h1("Word Cloud"),
# Add the word cloud output placeholder to the UI
___(outputId = "cloud")
)
# Define the server logic
server <- function(input, output) {
# Render the word cloud and assign it to the output list
output$___ <- ___({
# Create a word cloud object
create_wordcloud(artofwar)
})
}
# Run the application
shinyApp(ui = ui, server = server)