Created
June 19, 2022 19:34
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Insert/Remove UI elements in R Shiny
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| library(shiny) | |
| ui = fluidPage( | |
| titlePanel("My favorite movies"), | |
| hr(), | |
| # ------------------------------------- # | |
| # Input form | |
| tags$h3("Input form"), | |
| fluidRow( | |
| column(4, tags$label("Title")), | |
| column(4, tags$label("Director")), | |
| column(3, tags$label("Year released")) | |
| ), | |
| div(id = "placeholder"), | |
| actionButton(inputId = "new_row", label = "Add new movie", icon = icon("plus")), | |
| # ------------------------------------- # | |
| # Print user inputs | |
| hr(), | |
| tags$h3("User Inputs"), | |
| tableOutput("user_inputs") | |
| ) | |
| server = function(input, output) { | |
| user_inputs = reactiveVal(data.frame(title = character(0), | |
| director = character(0), | |
| year = integer(0))) | |
| row_id = 1 | |
| observeEvent( | |
| eventExpr = input$new_row, | |
| handlerExpr = { | |
| new_row = add_formGroup(paste0("row", row_id), user_inputs) | |
| insertUI(new_row, selector = "#placeholder", where = "beforeBegin") | |
| row_id <<- row_id + 1 | |
| } | |
| ) | |
| output$user_inputs = renderTable(user_inputs()) | |
| } | |
| add_formGroup = function(id, user_inputs){ | |
| moduleServer(id, function(input, output, session){ | |
| ns = NS(id) | |
| # Build UI | |
| ui = div( | |
| id = id, | |
| fluidRow( | |
| column(4, textInput(ns("title"), label = NULL, width = "100%")), | |
| column(4, textInput(ns("director"), label = NULL, width = "100%")), | |
| column(3, textInput(ns("year"), label = NULL, width = "100%")), | |
| column(1, actionButton(inputId = ns("remove_entry"), label = "X", style = "margin: 0px; padding: 0px; width: 34px; height: 34px")) | |
| ) | |
| ) | |
| # Observer for textInputs --> update 'user_inputs' reactiveVal | |
| observeEvent( | |
| eventExpr = { | |
| input$title | |
| input$director | |
| input$year | |
| }, | |
| handlerExpr = { | |
| new_row = c(title = input$title, director = input$director, year = input$year) | |
| inputs_df = isolate(user_inputs()) | |
| inputs_df[id,] = new_row | |
| user_inputs(inputs_df) | |
| } | |
| ) | |
| # Observer for 'remove_entry' --> remove UI | |
| observeEvent( | |
| eventExpr = input$remove_entry, | |
| handlerExpr = { | |
| inputs_df = isolate(user_inputs()) | |
| user_inputs(inputs_df[rownames(inputs_df) != id,]) | |
| removeUI(selector = paste0("#", id), session = session) | |
| } | |
| ) | |
| return(ui) | |
| }) | |
| } | |
| shinyApp(ui = ui, server = server) |
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