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  3. Case Studies: Building Web Applications with Shiny in R

Exercise

Add a plot title: text input

In Shiny, as soon as the user changes the value of any input, Shiny makes the current value of that input immediately available to you in the server through the input argument of the server function. You can retrieve the value of any input using input$<inputId>.

In order to assign a default initial value to a text input, the value argument is used.

Instructions

100 XP

The given Shiny app plots the GDP per capita vs life expectancy of countries in the gapminder dataset. Your task is to add a text input that lets users change the title of the plot. Specifically:

  • Add a text input to the UI with ID "title", a label of "Title", and a default value of "GDP vs life exp".
  • In the server code, make the title of the plot always reflect the current value of the title input by placing the title inside the ggtitle() function (line 24).