r - Shiny: add button label to sidebar & update buttons after click -
i'm bit rusty shiny reactivity, want 2 things when button clicked:
- add button label sidebar (and add more labels sidebar after more clicks)
- update button labels (i.e. more random integers)
i'm nervous changing label before recording it, want timing right. here's skeleton of i'm working with:
library(shiny) ui <- fluidpage( sidebarlayout( sidebarpanel( textoutput("clicks") ), mainpanel( uioutput("button1"), uioutput("button2") )) ) ################### server <- function(input, output, session) { output$clicks <- rendertext({ paste() }) ## reactive values inside <- reactive({ inside <- sample(1:100,2) }) ## buttons output$button1 <- renderui({ actionbutton("course1", label = inside()[1], style='padding:50px') }) output$button2 <- renderui({ actionbutton("course2", label = inside()[2], style='padding:50px') }) } shinyapp(ui = ui, server = server) right sidebar blank because i'm not sure how add it, or add make button labels update after click (whether inside reactive value or observeevent). appreciated!
here's way reactivevalues:
library(shiny) ui <- fluidpage( sidebarlayout( sidebarpanel( textoutput("clicks") ), mainpanel( uioutput("button1"), uioutput("button2") )) ) ################### server <- function(input, output, session) { # show history output$clicks <- rendertext({ history[['clicked']] }) ## reactive values # store history reactive values history <- reactivevalues(clicked = c()) # update history when button clicked observeevent(input$course1,{ history[['clicked']] <- c(history[['clicked']],inside()[1]) }) observeevent(input$course2,{ history[['clicked']] <- c(history[['clicked']],inside()[2]) }) #update inside when history updates inside <- reactive({ history[['clicked']] inside <- sample(1:100,2) }) ## buttons output$button1 <- renderui({ actionbutton("course1", label = inside()[1], style='padding:50px') }) output$button2 <- renderui({ actionbutton("course2", label = inside()[2], style='padding:50px') }) } shinyapp(ui = ui, server = server)
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