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DSBA 5122: Visual Analytics

Class 10: Intro to Shiny

Ryan Wesslen

November 4, 2019

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Shiny

A Shiny app is a web page (UI) connected to a computer running a live R session (Server)

Users can manipulate the UI, which will cause the server to update the UI's displays (by running R code).

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Try This

  1. Open a new .R file

  2. Type this into the file. (Do you have the shiny package?)

  3. Click "Run"

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User Interface: ui() function

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fluidPage()

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Example

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Example

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Input Syntax

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Inputs

There are multiple common Input() functions.

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What's in an Input function? HTML

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Output Syntax

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Output Options

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Example

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Example

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Example

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Example

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Layouts

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sidebarLayout()

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sidebarLayout()

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sidebarLayout()

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html tags if you know HTML

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Server: server() function

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Shiny: Output

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Server Recap

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15 minute Quick Assignment

Open the app.R file.

Try these three tasks:

  1. add a new slider that sets the number of breaks for the rnorm() function

  2. add a textInput() that sets the name of the plot

  3. add a actionButton() that updates the name of the plot (part 2) only when clicking (hint: see ?observeEvent)

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Deploying Apps to Shinyapps.io

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Setup connection to ShinyApps.io

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Setup connection to ShinyApps.io

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Deploy to ShinyApps.io

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Deploy to ShinyApps.io

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Shiny

A Shiny app is a web page (UI) connected to a computer running a live R session (Server)

Users can manipulate the UI, which will cause the server to update the UI's displays (by running R code).

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