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Web Application Development with R Using Shiny Second Edition

Web Application Development with R Using Shiny Second Edition

By : Chris Beeley
3.5 (10)
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Web Application Development with R Using Shiny Second Edition

Web Application Development with R Using Shiny Second Edition

3.5 (10)
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 (9 chapters)
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8
Index

Version two – grid layout (A)


In the next version of the application, we're going to use the fluidRow() function to apply a custom layout to the UI. This function allows you to implement the standard bootstrap grid layout, as described at w3schools.com/bootstrap/bootstrap_grid_system.asp.

The width of the screen is given as 12 units, and you can pass the column() functions of arbitrary size into a fluidRow() instruction to define a group of widths adding up to 12. In this simple example, we will have three columns within the first row and then one in the second row. The finished application looks like this:

ui.R

Let's look at the ui.R file necessary to achieve this. The server.R file remains the same as in the previous example. We'll take breaks as we step through the code to understand what's happening:

library(shiny)
shinyUI(fluidPage(
  # Application title
  titlePanel("Google Analytics"),

We start with titlePanel(), as in the previous application.

  fluidRow(

Now we add in rows of UI elements...

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