R Shiny 2 Minute Overview

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How does Shiny work?

Having a general understanding of this can really help you to be more effective at building applications.

A shiny application consists of two key components: a server that runs your R code and a user interface or UI that runs through a user's web browser.

The UI will contain a layout which can place input fields and outputs such as visualizations.

Input fields are things like text boxes drop-down menus and calendar controls that send their values back to the R server. The R server then updates its calculations and visualizations which get sent back to the UI to be displayed.

It's important to note that Shiny applications always need a server running R to work when you deploy your applications this will either be somewhere on the internet or somewhere on your network. If you have R installed on your computer R can launch a mini web server to run the application just on your computer. This is what happens every time we run an app in our course examples. This can be a quick and easy way to share your application with other users without setting up a server but won't work if people don't have R plus the necessary libraries installed.

In the next video we'll take a look at my favorite new R package that makes building Shiny applications even faster easier and more flexible.

[rrrprogram]

I would recommend to post videos which are of 10 - 20 mins... As tips on R..common pitfalls in R....imp concepts in R... Something new like shiny.. Etc etc... It would be great

[JonathanNg]

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[mayanktripathi]

Dear Sir,


I had a query, I am looking to save my if else output in a variable, which can dynamically change its value as the condition changes. I tried using a variable and put the if else in a loop() but the value stored in the variable is not changing dynamically. Please help. Below is the code

library(shiny)
library(shinydashboard)

ui <- shinyUI(fluidPage(

titlePanel("This is if else test"),

sidebarLayout(


sidebarPanel((" This is Test Panel"),

numericInput("price", "Enter the price", 10000),
numericInput("age", "Enter the age of the vehicle", 2)),

mainPanel(("This is main panel"),

textOutput("Myprice"), textOutput("myu"))

)

))

server <- shinyServer(function(input, output){

output$Myprice <- renderPrint({


save1<- ( if (input$age == 0){


paste("This is test", input$price + 1111)

paste("apple")

} else if(input$age == 1){

input$price +2222
}else if(input$age == 2){

input$price +3333
}else if(input$age == 3){

input$price +4444
} else {

0
}
)

})

outout$myu <- rendertext({


save1

})
})

shinyApp(ui, server)

[nilojansritharan]

Hi,
Is it possible to upload a Csv data into shiny app and use it in R?