Book Image

Web Application Development with R Using Shiny Second Edition - Second Edition

By : Chris Beeley
Book Image

Web Application Development with R Using Shiny Second Edition - Second Edition

By: Chris Beeley

Overview of this book

R is a highly flexible and powerful tool for analyzing and visualizing data. Most of the applications built using various libraries with R are desktop-based. But what if you want to go on the web? Here comes Shiny to your rescue! Shiny allows you to create interactive web applications using the excellent analytical and graphical capabilities of R. This book will guide you through basic data management and analysis with R through your first Shiny application, and then show you how to integrate Shiny applications with your own web pages. Finally, you will learn how to finely control the inputs and outputs of your application, along with using other packages to build state-of-the-art applications, including dashboards.
Table of Contents (14 chapters)
Web Application Development with R Using Shiny Second Edition
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Adding a pop-up window to an output


The addPopover() function from the shinyBS() package allows you to add pop-up windows to input or output elements within a shiny application. This is another one-liner, back in the server.R file, along with the function that draws the graph:

output$trend <- renderPlot({
  ...[functions from previous chapter]...
  if(input$smooth){
    thePlot <- thePlot + geom_smooth()
  }
  print(thePlot)
  addPopover(session, id = "trend", title = "Source",
    content = "All data from Google Analyics website at <a href =
    'http://example.com'>http://example.com</a>",
    trigger = 'click')
})

As you can see, addPopover() takes the session argument, which we gave to shinyServer() at the top, along with the ID of the element that we wish to annotate (trend) and a title (Source). Raw HTML can be passed straight in as in the preceding example.