Sorting a named list using actionButton Shiny - r

Question

I have a named list as follows:
vegshop <- list(
"FRUITS" = c("MANGO", "JACKFRUIT", "BANANA"),
'VEGETABLES' = c("OKRA", "BEANS", "CABBAGE")
)
I am trying to order the list based on the names, and this works fine.
vegshop[order(names(vegshop), decreasing = F)]
However when I try to do using an actionButton(), I am getting the following error:
the condition has `length > 1` and only the first element will be used
or
Warning: Error in order: unimplemented type 'list' in 'orderVector1'
A workable example is as follows:
vegshop <- list(
"FRUITS" = c("MANGO", "JACKFRUIT", "BANANA"),
'VEGETABLES' = c("OKRA", "BEANS", "CABBAGE")
)
grocer <- list(
"GROCERY" = c("CEREALS", "PULSES", "TOILETRIES"),
"CLEANERS" = c("DETERGENTS", "FLOOR CLEANERS", "WIPES")
)
library(shiny)
ui <- shinyUI(
fluidPage(
actionButton(style = "font-size: 10px;",inputId = "a2z", label = "Sort-A-Z", icon = icon("sort-alpha-asc")),
radioButtons(inputId = "shopsel", label = "SELECT SHOP", choices = c("SHOPS","SUPERMARKETS"), selected = "SHOPS", inline = TRUE),
uiOutput("shoplist")))
server <- function(session,input, output) {
output$shoplist <- renderUI({
if(input$shopsel == "SHOPS") {
selectInput(inputId = "vegShopList", label = "SHOPLIST", choices = vegshop, selected = c('MANGO', 'JACKFRUIT', 'BANANA'), multiple = TRUE, selectize = FALSE)
} else if(input$shopsel == "SUPERMARKETS") {
selectInput(inputId = "smList", label = "SUPERMARKET", choices = grocer, selected = c('CEREALS', 'PULSES', 'TOILETRIES'), multiple = TRUE, selectize = FALSE)
}
})
observeEvent(input$a2z, {
if(input$shopsel == "SHOPS") {
updateSelectInput(session, inputId = "vegShopList", choices = vegshop[order(vegshop), decreasing = F], selected = NULL)
} else if(input$shopsel == "SUPERMARKETS") {
updateSelectInput(session, inputId = "smList", choices = grocer[order(grocer), decreasing = F], selected = NULL)
}
})
}
shinyApp(ui = ui, server = server)
How could I get the list sorted by the names using the actionButton().

Answer 1

You have a typo:
Outside shiny you write:
vegshop[order(names(vegshop), decreasing = F)]
Within shiny:
vegshop[order(vegshop), decreasing = F]
The same probably holds for the following shiny code snippet:
grocer[order(grocer), decreasing = F]