dynamically generated navbar and tabPanels in r shiny - r

Question

I'm trying to make a dynamically generated navbar based on the session user id.
I have a data table that maps the session user to a list of that user's clients. I want the app to produce a navbar where each tabPanel is for each client that user has. I'm not sure how I can easily do that since navbarPage() doesn't take a list argument.
Below is my example
library(shiny)
data <- data.frame(user=c("emily", "emily"), clients=c("client1", "client2"))
CreateCustomNavbarContent <- function(data) {
l <- lapply(data$clients, function(client) {
tabPanel(client,
h2(client))
})
renderUI({
l
})
}
shinyApp(
ui <- fluidPage(
uiOutput("custom_navbar")
),
server <- function(input, output) {
output$custom_navbar <- renderUI({
## commented below doesn't work
# navbarPage(
# CreateCustomNavbarContent(data)
# )
navbarPage("",
tabPanel("client1",
h2("client1")
),
tabPanel("client2",
h2("client2")
)
)
})
}
)

Answer 1

You could achieve what you want with do.call, so we can pass a list of arguments as separate arguments. Below is a working example, I gave emily a companion called John so you can validate that the code does what you want ;)
Hope this helps!
library(shiny)
data <- data.frame(user=c("Emily", "Emily","John","John"), clients=c("client1", "client2","client3","client4"))
ui = fluidPage(
selectInput('select_user','Select user:',unique(data$user)),
uiOutput('mytabsetpanel')
)
server = function(input, output, session){
output$mytabsetpanel = renderUI({
myTabs = lapply(data$clients[data$user==input$select_user], tabPanel)
do.call(tabsetPanel, myTabs)
})
}
shinyApp(ui,server)