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ShinyApp - Dynamically Add/Remove UI Elements
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| Title: Dynamically Remove UI Elements | |
| Author: [email protected] | |
| DisplayMode: Showcase | |
| Type: Shiny |
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| library(shiny) | |
| removeMeButton <- function(id, label = paste0("Remove Me, I am ", id)) { | |
| actionButton(paste0("rmBtn", id), label = label) | |
| } | |
| shinyServer(function(input, output) { | |
| container <- reactiveValues(uiComponents = list()) | |
| output$container <- renderUI({ | |
| container$uiComponents | |
| }) | |
| observe({ | |
| if(is.null(input$addBtn) || input$addBtn == 0) return() | |
| isolate({ | |
| uiComponentCount <- length(container$uiComponents) | |
| container$uiComponents <- append( | |
| container$uiComponents, | |
| list( | |
| list( | |
| "removeBtn" = removeMeButton(id = as.integer(runif(1,1e5,1e6-1))), | |
| br(),br() | |
| ) | |
| ) | |
| ) | |
| }) | |
| }) | |
| observe({ | |
| if(length(container$uiComponents) == 0) return() | |
| rmBtns <- lapply(container$uiComponents, `[[`, "removeBtn") | |
| rmBtnIds <- sapply(container$uiComponents, function(uiCom) { | |
| uiCom$removeBtn$attribs$id | |
| }) | |
| rmBtnVals <- sapply(rmBtnIds, function(btnId) input[[btnId]]) | |
| if(any(sapply(rmBtnVals, is.null))) return() | |
| if(all(rmBtnVals == 0)) return() | |
| isolate({ | |
| container$uiComponents[[which(rmBtnVals > 0)]] <- NULL | |
| }) | |
| }) | |
| }) | |
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| library(shiny) | |
| shinyUI(fluidPage( | |
| titlePanel("Dynamically Add/Remove UI Elements"), | |
| hr(), | |
| actionButton("addBtn", "Add"), | |
| br(),br(), | |
| uiOutput("container") | |
| )) | |
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Hi @jameswcraig
I think I have totally forgot what I have written almost 6 years ago.
BTW, I think Python Voila project can do a better job for writing "tiny" data analysis web applications.
I am sorry I can't help.