Shiny Cheat Sheet

Introduction

Shiny is a web application framework for R, a popular programming language used for statistical computing and data analysis. It allows users to create interactive web applications and dashboards without the need for extensive web development knowledge.

With Shiny, users can easily create web applications that allow for data visualization, data exploration, and data analysis. The framework provides a variety of tools and widgets that can be used to create interactive plots, tables, and other visualizations.

One of the key benefits of Shiny is its ability to integrate with other R packages, allowing users to leverage the power of R’s statistical and data analysis capabilities. This makes it an ideal tool for data scientists, analysts, and researchers who want to share their work with others in an interactive and engaging way.

Basic Structure

Element	Description
ui	The user interface of the application
server	The server-side logic of the application
shinyApp	The function that creates the Shiny application

User Interface

Layouts

Element	Description
fluidPage	A fluid layout that adjusts to the size of the browser window
fixedPage	A fixed layout with a fixed width
navbarPage	A layout with a navigation bar at the top
sidebarLayout	A layout with a sidebar and a main panel
splitLayout	A layout with two or more panels that can be resized

UI Components

Element	Description
actionButton	A button that triggers an action
checkboxInput	A checkbox that can be checked or unchecked
dateInput	A date picker
fileInput	A file upload button
numericInput	A numeric input field
radioButtons	A set of radio buttons
selectInput	A dropdown menu
sliderInput	A slider
submitButton	A button that submits a form
textInput	A text input field

Output Components

Element	Description
plotOutput	A plot
tableOutput	A table
verbatimTextOutput	Text output
htmlOutput	HTML output
imageOutput	An image

Server-Side Logic

Reactive Programming

Element	Description
reactive	A function that creates a reactive object
observe	A function that observes a reactive object and triggers an action
eventReactive	A function that creates a reactive object that is triggered by an event
isolate	A function that isolates a reactive object from other reactive objects

Data Manipulation

Element	Description
renderPlot	A function that renders a plot
renderTable	A function that renders a table
renderText	A function that renders text
renderUI	A function that renders UI components
reactiveValues	A function that creates a reactive object that can be modified

Session Management

Element	Description
session	An object that represents the current session
stop	A function that stops the current session
invalidateLater	A function that invalidates a reactive object after a certain amount of time
reactiveTimer	A function that creates a reactive object that triggers after a certain amount of time

Conclusion

This cheat sheet provides an overview of the basic elements of Shiny, including the user interface, server-side logic, and reactive programming tools. With this knowledge, you can start building your own interactive web applications using R and Shiny.

Reference:

https://shiny.rstudio.com/