How to check if a checkbox has been selected using ShinyDashboard? - r

Question

I have created an app using ShinyDashboard that has one checkboxInput. If you click on it, you will see two checkboxGroupInput where you can select 1 or 2 choices.
The idea is that if you click 1 option, you will subset your dataframe with your individual choice, or if you click both options, you will subset your dataframe with those two options.
However, I am having problems to verify which option of the checkboxGroupInput the user has selected.
Here is a reproducible example. As you can see, if you select both, you end in the first if statement, subsetting two columns. However, if you select one option (setosa, for example), you are still subsetting by the two, because it doesn't recognise the choice that you have selected. However, if you select "virginica" it is subsetted.
Moreover, it appears this warning all the time.
Warning in if (c("setosa", "virginica") %in% input$species_choice) { :
the condition has length > 1 and only the first element will be used
The code:
library(shiny)
library(shinydashboard)
library(shinyWidgets)
ui <- dashboardPage(
dashboardHeader(title = "Dashboard"),
## Sidebar content
dashboardSidebar(
sidebarMenu(
menuItem("App1", tabName = "App1", icon = icon("th"))
)
),
dashboardBody(
fluidRow(
tabItems(
tabItem(tabName = "App1",
sidebarPanel(
checkboxInput(inputId = "species", label = "Select species"),
conditionalPanel(
condition = "input.species",
style = "margin-left: 20px;",
checkboxGroupInput("species_choice", "Choose the species:",
choices = c("setosa", "virginica"), selected = c("setosa", "virginica"))),
),
mainPanel(
dataTableOutput("table")
)
)
)
)
)
)
server <- function(input, output, session) {
mytables <- reactive({
if(input$species){
df_setosa <- iris[iris$Species=="setosa",]
df_virginica <- iris[iris$Species=="virginica",]
df_both <- rbind(df_setosa, df_virginica)
if(c("setosa", "virginica") %in% input$species_choice){
print("both")
return(df_both)
}
if("setosa" %in% input$species_choice){
print("setosa")
return(df_setosa)
}
if("virginica" %in% input$species_choice){
print("virginica")
return(df_virginica)
}
}
})
output$table <- renderDataTable({
mytables()
})
}
shinyApp(ui, server)
I have tried this way too, but it doesn't work:
if(input$species_choice == "setosa"){
print("setosa")
return(df_setosa)
}
if(input$species_choice == "virginica"){
print("virginica")
return(df_virginica)
}
if(input$species_choice == c("setosa, virginica"){
print("both")
return(df_both)
}
Does anyone know how to help me, please?
Thanks in advance

Answer 1

There is no need to subset your dataframe before the if conditions, and you don't need all those if conditions. You can simply check if the first button is clicked (my first if condition), and if it is then you can subset your dataframe with the selected specie(s).
Note that if you select none of the two species, the table is empty (but you can change this behavior).
mytables <- reactive({
if (input$species) {
iris[iris$Species %in% input$species_choice, ]
} else {
iris
}
})

Answer 2

I found another solution:
I just have to include if(all(c(OPTIONS) ....
library(shiny)
library(shinydashboard)
library(shinyWidgets)
ui <- dashboardPage(
dashboardHeader(title = "Dashboard"),
## Sidebar content
dashboardSidebar(
sidebarMenu(
menuItem("App1", tabName = "App1", icon = icon("th"))
)
),
dashboardBody(
fluidRow(
tabItems(
tabItem(tabName = "App1",
sidebarPanel(
checkboxInput(inputId = "species", label = "Select species"),
conditionalPanel(
condition = "input.species",
style = "margin-left: 20px;",
checkboxGroupInput("species_choice", "Choose the species:",
choices = c("setosa", "virginica"), selected = c("setosa", "virginica"))),
),
mainPanel(
dataTableOutput("table")
)
)
)
)
)
)
server <- function(input, output, session) {
mytables <- reactive({
if(input$species){
df_setosa <- iris[iris$Species=="setosa",]
df_virginica <- iris[iris$Species=="virginica",]
df_both <- rbind(df_setosa, df_virginica)
if(all(c("setosa", "virginica") %in% input$species_choice)){
print("both")
return(df_both)
}
if(all(c("setosa") %in% input$species_choice)){
print("setosa")
return(df_setosa)
}
if(all(c("virginica") %in% input$species_choice)){
print("virginica")
return(df_virginica)
}
}
})
output$table <- renderDataTable({
mytables()
})
}
shinyApp(ui, server)