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Shiny dynamic UI - observers & for loop
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| # An example based on http://shiny.rstudio.com/articles/dynamic-ui.html | |
| library(shiny) | |
| ui = basicPage( | |
| fluidRow( | |
| actionButton(inputId = "add_buttons", label = "Add 5 Buttons") | |
| ), | |
| uiOutput("more_buttons") # this is where the dynamically added buttons will go | |
| ) | |
| server = function(input, output) | |
| { | |
| # We need to track the actionButtons and their respective observeEvents | |
| rvs = reactiveValues(buttons = list(), observers = list()) | |
| observeEvent(input$add_buttons, { | |
| l = length(rvs$buttons) + 1 | |
| for(i in l:(l+4)) { | |
| rvs$buttons[[i]] = actionButton(inputId = paste0("button",i), label = i) | |
| rvs$observers[[i]] = local({ | |
| i <- i; | |
| observeEvent(input[[paste0("button",i)]], { | |
| print(sprintf("You clicked button number %d",i)) | |
| }) | |
| }) | |
| } | |
| } | |
| ) | |
| output$more_buttons = renderUI({ | |
| do.call(fluidRow, rvs$buttons) # Add the dynamic buttons into a single fluidRow | |
| }) | |
| } | |
| shinyApp(ui, server) |
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