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Cascading Menu System for Shiny
library(shiny)
## test dataframe
df <- data.frame(option1 = c("A","A","B","B","C","C"),
option2 = c("A1","A2","B3","B1","C2","C3"),
option3 = c(T,F,T,F,T,F),
option4 = c("a","b","c","d","e","f"))
shinyServer(function(input, output, session) {
## would like to be able to change the rows displayed here eventually
output$table1 <- renderTable({
df
})
output$result <- renderText({
x <- input$menu1
y <- input$menu2
z <- as.logical(input$menu3) ## has been changed to a character "true"
if (any(
is.null(x),
is.null(y),
is.null(z)
))
return("Select")
choice4 <- df[df$option1 == x & df$option2 == y & df$option3 == z,
"option4"]
text <- paste("Your choice is: ",as.character(choice4))
# browser()
})
output$control1 <- renderUI({
selectInput("menu1", "Menu1", choices = unique(df$option1))
})
output$control2 <- renderUI({
x <- input$menu1
if (any(
is.null(x)
))
return("Select")
choice2 <- df[df$option1 == x,
"option2"]
selectInput("menu2", "Menu2", choices = choice2)
})
output$control3 <- renderUI({
x <- input$menu1
y <- input$menu2
if (any(
is.null(x),
is.null(y)
))
return("Select")
choice3 <- df[df$option1 == x & df$option2 == y,
"option3"]
selectInput("menu3", "Menu3", choices = choice3)
})
## use these?
# outputOptions(output, "menu1", priority = 1)
# outputOptions(output, "menu2", priority = 2)
# outputOptions(output, "menu3", priority = 3)
})
# This is the user-interface definition of a Shiny web application.
# You can find out more about building applications with Shiny here:
#
# http://www.rstudio.com/shiny/
#
library(shiny)
shinyUI(pageWithSidebar(
# Application title
headerPanel("Menu Test"),
# Sidebar with a slider input for number of observations
sidebarPanel(
uiOutput("control1"),
uiOutput("control2"),
uiOutput("control3"),
textOutput("result")
),
# Show a plot of the generated distribution
mainPanel(
tableOutput("table1")
)
))
@amantione

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@amantione amantione commented Jul 30, 2020

Exactly what I was looking for. Thank you.

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