Question

嗨，我在jquery中有此变量，它获取选中的输入单选按钮的值，

library(shiny)

# Define UI for data download app ----
ui <- fluidPage(

  # App title ----
  titlePanel("Downloading Data"),

  # Sidebar layout with input and output definitions ----
  sidebarLayout(

    # Sidebar panel for inputs ----
    sidebarPanel(

      # Input: Choose dataset ----
      selectInput("dataset", "Choose a dataset:",
                  choices = c("rock", "pressure", "cars")),
      checkboxInput("quotes",
                    strong("Include quotes around values"), 
                    value = F),

      # Button
      downloadButton("downloadData", "Download")

    ),

    # Main panel for displaying outputs ----
    mainPanel(

      tableOutput("table")

    )

  )
)

# Define server logic to display and download selected file ----
server <- function(input, output) {

  # Reactive value for selected dataset ----
  datasetInput <- reactive({
    switch(input$dataset,
           "rock" = rock,
           "pressure" = pressure,
           "cars" = cars)
  })

  # Table of selected dataset ----
  output$table <- renderTable({
    datasetInput()
  })

  # Downloadable csv of selected dataset ----
  output$downloadData <- downloadHandler(
    filename = function() {
      paste(input$dataset, ".csv", sep = "")
    },
    if(input$quotes==F){
    content = function(file) {
      write.csv(datasetInput(), file, row.names = FALSE,quote = F)
    }
    }
else{
  content = function(file) {
    write.csv(datasetInput(), file, row.names = FALSE,quote = T)
  }
}
  )

}

# Create Shiny app ----
shinyApp(ui, server)

我的输入字段如下：

var gender = [];
    $("input[type='radio'][name='gender\\[$counter\\]']:checked").each(function ()
    {
        gender.push($(this).val());
    });       

    console.log(gender);

但是console.log（gender）;返回值“ []”，但不返回该输入字段的值。似乎是什么问题？请帮忙。

Answer 1

由于您将性别定义为数组[] ...因此将性别显示为数组[]。

为什么性别是数组？性别不分男女，不超过一个。因此，从

开始

var gender = "";

然后无需遍历所有元素，因为将仅检查一个元素。为了确保并避免出现异常，请先检查是否检查了收音机：

if($("input[type='radio'][name='gender\\[$counter\\]']:checked").length > 0){    
   gender = $("input[type='radio'][name='gender\\[$counter\\]']:checked").val();
}

jQuery中的变量数组返回[]（括号）值

1 个答案: