r shiny：从以前持久存储的数据中加载数据以形成字段

Question

Dean Attali 的要点：https://gist.github.com/daattali/c4db11d81f3c46a7c4a5 在本例中：可以输入、提交和保存数据（持久数据存储）。您可以在提交后出现的 table 中看到提交的数据。随着时间的推移，table 随着不同的条目而增长。到目前为止还没有可能加载提交表单中的数据来更改或更新提交？！

我的问题：是否可以将以前提交的数据不仅加载到 table，而且加载到字段（名称、使用闪亮、r 年数）？我想更新条目并将它们保存回来。我知道增删改查。我想知道 Dean Attali 的持久数据存储示例是否可行。谢谢！

library(shiny)

# Define the fields we want to save from the form
fields <- c("name", "used_shiny", "r_num_years")

# Save a response
# ---- This is one of the two functions we will change for every storage type ----
saveData <- function(data) {
  data <- as.data.frame(t(data))
  if (exists("responses")) {
    responses <<- rbind(responses, data)
  } else {
    responses <<- data
  }
}

# Load all previous responses
# ---- This is one of the two functions we will change for every storage type ----
loadData <- function() {
  if (exists("responses")) {
    responses
  }
}

# Shiny app with 3 fields that the user can submit data for
shinyApp(
  ui = fluidPage(
    DT::dataTableOutput("responses", width = 300), tags$hr(),
    textInput("name", "Name", ""),
    checkboxInput("used_shiny", "I've built a Shiny app in R before", FALSE),
    sliderInput("r_num_years", "Number of years using R", 0, 25, 2, ticks = FALSE),
    actionButton("submit", "Submit")
  ),
  server = function(input, output, session) {
    
    # Whenever a field is filled, aggregate all form data
    formData <- reactive({
      data <- sapply(fields, function(x) input[[x]])
      data
    })
    
    # When the Submit button is clicked, save the form data
    observeEvent(input$submit, {
      saveData(formData())
    })
    
    # Show the previous responses
    # (update with current response when Submit is clicked)
    output$responses <- DT::renderDataTable({
      input$submit
      loadData()
    })     
  }
)

Answer 1

我现在完全找到了我要找的东西：https://www.r-bloggers.com/shiny-crud-app/ 此 post 将逐步向您展示如何构建一个 Shiny 应用程序，让您可以在 table.

中创建、更新和删除数据

您可以在此处查看正在运行的应用程序：https://gluc.shinyapps.io/crud

完整的 source-code 在此要点中：https://gist.github.com/gluc/d39cea3d11f03542970b

现在下一步是合并：提交、新建、删除并保存到例如 csv 文件。我会试试的！

r shiny：从以前持久存储的数据中加载数据以形成字段

r shiny: Load data in to form fields from previously persistent stored data

forms

storage

r

persistent

shiny