代码之家 › 专栏 › 技术社区 › Rachel

R Shiny validate数据有效时返回错误

shiny validation r

Rachel · 技术社区 · 7 年前

我有一个闪亮的应用程序,在没有数据的情况下会产生错误,我正在尝试使用validate来生成更好的错误消息。我已经让它对没有数据的变量起作用,但是在有数据的地方,我得到了一个错误,应该出现一个图(或表)。

使用以下代码,我得到以下错误。

else if (input$geo=="Alaska, 2015") {
    data <- switch(
        validate(need(input$var != "Sexual Orientation", "Data Unavailable")),
        input$var, 
        "Housing Status" = hmlweightak,
        "Sex" = sexweightak,
        "Race/Ethnicity" = raceethweightak,
        "Sexual Orientation" = "",
        "Bullied at School in the last 12 Months" = bsweightak,
        "Missed School due to Safety Concerns" = usweightak,
        "Deliberately hurt by an intimate partner" = pvweightak,
        "Forced to Perform Sexual Acts by Intimate Partner in the last 12 Months" = saweightak,
        "Binge Drank in the last 30 days" = bdweightak,
        "First Tried Alcohol by Age 12" = faweightak,
        "First Tried Marijuana by Age 12" = fmweightak,
        "Suffered from Depression in the last 12 Months" = dweightak,
        "Had Suicidal Thoughts in the last 12 Months" = stweightak,
        "Attempted Suicide in the last 12 Months" = asweightak,
        "Required Medical Attention After Suicide Attempt in the last 12 Months" = smweightak,
        "Ever Used Illegal Drugs" = sdweightak,
        "Used Prescription Drugs Without a Prescription" = pdweightak,
        "Sexually Active by Age 13" = fiweightak,
        "Drank or Used Drugs Before Last Sexual Intercourse" = ddliweightak,
        "Breakfast in the Last 7 Days" = "",
        "Average Hours of Sleep per Night" = hsweightak,
        "Used a Condom During Last Sexual Intercourse" = clweightak,
        "Asthma" = aweightak
    )
}

当我包括 get() 之前 input$var ,之前我得到了一个不同的错误,它基本上列出了所有的变量,但现在我似乎无法重现。这只是代码的一小部分,所以请让我知道更多的代码或截图是否会有帮助,但我希望这是一个简单的东西,因为它似乎只工作了一半。提前感谢!

1 回复 | 直到 7 年前

Maximilian Peters 7 年前

问题在于 switch 和 validate 陈述

假设根据您的输入$dropDownValue,您希望返回一个或另一个数据集。如果 iris return datasets::iris ,则需要以下语句。

switch(input$dropDownValue,
       iris = datasets::iris,
       cars = datasets::cars)

验证 如果第一条语句的计算结果为,则停止函数的执行并添加验证消息 FALSE 。

你的情况应该是

validate(need(input$var != "Sexual Orientation", "Data Unavailable"))
data <- switch(input$var, 
               "Housing Status" = hmlweightak,
               "Sex" = sexweightak,
               [...]
               )

有关使用的示例,请参见下面的代码 验证 和 转换 。

library(shiny)
library(datasets)

ui <- fluidPage(
   selectInput("dropDownValue", "Data", c("no data", "iris", "cars")),
    mainPanel(
      plotOutput("plot")
    )
)

server <- function(input, output) {
  data <- reactive({
    validate(
      need((input$dropDownValue == "iris" || input$dropDownValue == "cars"), "Please select a data set")
    )
    switch(input$dropDownValue,
           iris = datasets::iris,
           cars = datasets::cars)
  })

  output$plot <- renderPlot({
    hist(data()[, 1])
  })
}
shinyApp(ui, server)