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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

Downloading and uploading data


Downloading data is done in a very similar fashion, which looks like the following downloadHandler() call:

output$downloadData <- downloadHandler(
  filename = function(){
    "myData.csv"
  }
  content = function(file){
    write.csv(passData(), file)
  }
)

Uploading data is achieved using the fileInput() function. In the following example, we will assume that the user wishes to upload a comma-separated spreadsheet (.csv) file. The button is added to ui.R in the following manner:

fileInput("uploadFile", "Upload your own CSV file")

This button allows a user to select their own .csv file, and it also makes a variety of objects based on the ID (in this case, input$uploadFile$...) available from server.R. The most useful is input$uploadFile$datapath, which is a path to the file itself and can be turned into a dataframe using read.csv():

userData <- read.csv(input$uploadFile$datapath)

There are other bits of information about the file available. Take a look at...

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