Book Image

Web Application Development with R Using Shiny - Third Edition

By : Chris Beeley, Shitalkumar R. Sukhdeve
Book Image

Web Application Development with R Using Shiny - Third Edition

By: Chris Beeley, Shitalkumar R. Sukhdeve

Overview of this book

Web Application Development with R Using Shiny helps you become familiar with the complete R Shiny package. The book starts with a quick overview of R and its fundamentals, followed by an exploration of the fundamentals of Shiny and some of the things that it can help you do. You’ll learn about the wide range of widgets and functions within Shiny and how they fit together to make an attractive and easy to use application. Once you have understood the basics, you'll move on to studying more advanced UI features, including how to style apps in detail using the Bootstrap framework or and Shiny's inbuilt layout functions. You'll learn about enhancing Shiny with JavaScript, ranging from adding simple interactivity with JavaScript right through to using JavaScript to enhance the reactivity between your app and the UI. You'll learn more advanced Shiny features of Shiny, such as uploading and downloading data and reports, as well as how to interact with tables and link reactive outputs. Lastly, you'll learn how to deploy Shiny applications over the internet, as well as and how to handle storage and data persistence within Shiny applications, including the use of relational databases. By the end of this book, you'll be ready to create responsive, interactive web applications using the complete R (v 3.4) Shiny (1.1.0) suite.

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Table of Contents (11 chapters)
Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Get in touch
Free Chapter
1
Beginning R and Shiny
Beginning R and Shiny
Installing R
The R console
Code editors and IDEs
Learning R
Loading data
Data types and structures
Base graphics and ggplot2
Introduction to the tidyverse
Installing Shiny and running the examples
Summary
2
Shiny First Steps
Shiny First Steps
Types of Shiny application
A minimal example of a full Shiny application
Widget types
The Gapminder application
Advanced layout features
Summary
3
Integrating Shiny with HTML
Integrating Shiny with HTML
Running the applications and code
Shiny and HTML
Custom HTML links in Shiny
A minimal HTML interface
Including a Shiny app on a web page
HTML templates
Exercise
Bootstrap 3 and Shiny
Summary
4
Mastering Shiny's UI Functions
Mastering Shiny's UI Functions
Shiny's layout functions
Streamlining the UI by hiding elements
Beautiful tables with DataTable
Reactive user interfaces
Progress bars
Progress bar with shinycssloaders
Modals
Alternative Shiny designs
Summary
5
Easy JavaScript and Custom JavaScript Functions
Easy JavaScript and Custom JavaScript Functions
JavaScript and Shiny
Shinyjs
Extendshinyjs
Responding to events in JavaScript
htmlwidgets
rCharts
d3heatmap
threejs
Summary
6
Dashboards
Dashboards
Applications in this chapter
Flexdashboards
Sidebar application with extra styling
Using the grid layout
Full dashboard
Info boxes
Summary
7
Power Shiny
Power Shiny
Animation
Reading client information and GET requests in Shiny
Custom interfaces from GET strings
Downloading graphics and reports
Downloadable reports with knitr
Downloading and uploading data
Bookmarking
Interactive plots
Interactive tables
Linking interactive widgets
Shiny gadgets
Adding a password
Summary
8
Code Patterns in Shiny Applications
Code Patterns in Shiny Applications
Reactivity in RShiny
Controlling specific input with the isolate() function
Running reactive functions over time (execution scheduling)
Event-handling using observeEvent and eventReactive
Functions and modules
Shinytest
Debugging
Handling errors (including validate() and req())
Profiling R code
Debounce and throttle
Summary
9
Persistent Storage and Sharing Shiny Applications
Persistent Storage and Sharing Shiny Applications
Sharing over GitHub
Sharing applications using Git
Persistent data storage
Database using Dplyr, DBI, and POOL
SQL Injection
Summary
10
Other Books You May Enjoy
Other Books You May Enjoy
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A minimal example of a full Shiny application

The first thing to note is that Shiny programs are the easiest to build and understand using two scripts, which are kept within the same folder. They should be named server.R and ui.R.

The ui.R of the minimal example

The ui.R file is a description of the UI, and is often the shortest and simplest part of a Shiny application. In the following code, note the use of the # character, which marks lines of code as comments that will not be run, but which are for the benefit of the humans producing the code:

fluidPage(                                 # Line 1 
  titlePanel("Minimal application"),       # Line 2 
  sidebarLayout(                           # Line 3 
    sidebarPanel...
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