在闪亮的应用程序中重置手持音频值

Question

我正在使用Shiny和rhandsontable包构建一个带有handsontable的数据输入表单。我已经启动并运行了表和所有其他字段，但我希望在用户单击submit按钮后重置用户在handsontable中输入的值，以便他们可以在新表单上输入另一个响应。我尝试了在github上找到的几种解决方案，但似乎都不适用于我的数据……在点击submit按钮后，它们仍然保留旧的值。

这是该应用程序的一个版本(删除了数据保存和数据库连接)

    library(shiny)
library(rhandsontable)

# which fields get saved 
fieldsAll <- c("name", "alt_name", "taxonomy", "distribution", "disease", "host", "substrate", "other")

# which fields are mandatory
fieldsMandatory <- c("name")

# add an asterisk to an input label
labelMandatory <- function(label) {
  tagList(
    label,
    span("*", class = "mandatory_star")
  )
}

########APP#############
ui = fluidPage(
  shinyjs::useShinyjs(),

  div(id = "header",
      h1("Data entry")
      ),

  fluidRow(
    column(4,
           div(
             id = "form",
             helpText(h4("Nomenclature")),
             textInput("name", labelMandatory("Scientific Name"), ""),
             textInput("alt_name", "Comma separated alternative names(s)", ""),
             br(),
             br(),
             helpText(h4("Basic Data")),
             textInput("taxonomy", "GBIF ID (or other taxonomy database link)", ""),
             textInput("distribution", "Distribution (Eg. North America)", ""),
             textInput("disease", "Disease Type (eg. vascular wilt)", ""),
             textInput("host", "Common Hosts (eg. poaceae, confiers, etc.)", ""),
             textInput("substrate", "Common Substrates(s) (eg. infloresence)", ""),
             textInput("other", "Other Data", ""),
             br(),
             br(),
             helpText(h4("Submission")),
             helpText("Please double check that all info is correct before submitting"),
             actionButton("submit", "Submit", class = "btn-primary"),

             shinyjs::hidden(
               span(id = "submit_msg", "Submitting..."),
               div(id = "error",
                   div(br(), tags$b("Error: "), span(id = "error_msg"))
               )
             )
           ),

           shinyjs::hidden(
             div(
               id = "thankyou_msg",
               h3("Thanks, your response was submitted successfully!"),
               actionLink("submit_another", "Submit another response")
             )
           )
    ),
    column(8,
           div(
             id = "form2",

             rHandsontableOutput("hot", width = 1000, height = 600),

             shinyjs::hidden(
               span(id = "submit_msg", "Submitting..."),
               div(id = "error",
                   div(br(), tags$b("Error: "), span(id = "error_msg"))
               )
             )
    )
           )
    )
  )


server <- function(input, output, session) {
  # Enable the Submit button when all mandatory fields are filled out
  observe({
    mandatoryFilled <-
      vapply(fieldsMandatory,
             function(x) {
               !is.null(input[[x]]) && input[[x]] != ""
             },
             logical(1))
    mandatoryFilled <- all(mandatoryFilled)

    shinyjs::toggleState(id = "submit", condition = mandatoryFilled)
  })

  #handsontable for input values
  values = reactiveValues(DF = data.frame(location = rep("place name", 5), dates = rep("YYYY", 5), hosts = rep("host", 5),
                                          references = rep("ref", 5),
                                          stringsAsFactors = F))

  locations_table = reactive({
    if (!is.null(input$hot)) {
      DF = hot_to_r(input$hot)
    } else {
      DF = values$DF
    }
    values$DF = DF
    DF
  })

  output$hot <- renderRHandsontable({
    DF = locations_table()
    if (!is.null(DF))
      rhandsontable(DF, useTypes = F, stretchH = "all")
  })

  # When the Submit button is clicked, submit the response
  observeEvent(input$submit, {

    # User-experience stuff
    shinyjs::disable("submit")
    shinyjs::show("submit_msg")
    shinyjs::hide("error")

    # Save the data (show an error message in case of error)
    tryCatch({
      shinyjs::reset("form")
      shinyjs::hide("form")
      shinyjs::reset("form2")
      shinyjs::hide("form2")
      shinyjs::show("thankyou_msg")
    },
    error = function(err) {
      shinyjs::html("error_msg", err$message)
      shinyjs::show(id = "error", anim = TRUE, animType = "fade")
    },
    finally = {
      shinyjs::enable("submit")
      shinyjs::hide("submit_msg")
    })
  })

  # submit another response
  observeEvent(input$submit_another, {
    shinyjs::show("form")
    shinyjs::show("form2")
    shinyjs::hide("thankyou_msg")
  })

}

# Run the application 
shinyApp(ui = ui, server = server)

Answer 1

您似乎正在使用textInput小部件来收集用户输入。因此，您可以使用updateTextInput在按钮观察事件中更改这些设置。

事实上，您应该会发现，每个闪亮的小部件都有一个更新功能，可以让您执行类似的操作。