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Week 10: So shiny!

Objectives

Let’s make something interactive! Shiny is an R/python package that makes it easy to build interactive web applications (apps) straight from R/Python. This lesson will get you started building Shiny apps right away. You will learn how to:

• Build a user interface
• Add control widgets
• Display reactive output
• Use python scripts and data
• Use reactive expressions

Setting up

You will be creating a shiny app, so there is no need for a notebook this week.

What’s Shiny, precious, eh?

• Shiny is a package that makes it easy to build interactive web apps.
• Shiny apps are interactive ways to display/showcase or work with your data. See here:

Start off by installing the shiny package:

pip install shiny

Then create a package from the terminal.

shiny create  

Reactive == Interactive

• Reactivity is the ability of a program to compute outputs from user inputs
• The program ‘responds’ to user defined changes
• Three components:
  1. Reactive Inputs
• Triggers that cause values to be set in the environment
• actions from buttons, selections, uploads, forms, etc.
  1. Reactive Outputs
• Outputs displayed on the browser
• graphs, plots, tables, etc.
  1. Reactive Expressions
• expressions that take in the reactive input and convert it to a reactive output

Run!

shiny run --reload --launch-browser app_dir/app.py

Widgets (input)

• go in the ui function

function	widget
actionButton	Action Button
checkboxGroupInput	A group of check boxes
checkboxInput	A single check box
dateInput	A calendar to aid date selection
dateRangeInput	A pair of calendars for selecting a date range
fileInput	A file upload control wizard
helpText	Help text that can be added to an input form
numericInput	A field to enter numbers
radioButtons	A set of radio buttons
selectInput	A box with choices to select from
sliderInput	A slider bar
submitButton	A submit button
textInput	A field to enter text

Output functions

• go in the ui function

Output function	Creates
dataTableOutput	DataTable
htmlOutput	raw HTML
imageOutput	image
plotOutput	plot
ableOutput	table
textOutput	text
uiOutput	raw HTML
verbatimTextOutput	text

Render functions

• go in the server function

render function	Creates
renderDataTable	DataTable
renderImage	images (saved as a link to a source file)
renderPlot	plots
renderPrint	any printed output
renderTable	data frame, matrix, other table like structures
renderText	character strings
renderUI	a Shiny tag object or HTML

Resources and other

https://shiny.posit.co/py/docs/overview.html

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