3

我正在尝试使用闪亮应用程序上的文本输入小部件来过滤数据框中的行，但我无法让它工作。

数据集

df1<-data.frame (Name=c("Carlos","Pete","Carlos","Carlos","Carlos","Pete","Pete","Pete","Pete","Homer"),Sales=(as.integer(c("3","4","7","6","4","9","1","2","1","9"))))

用户界面

shinyUI(fluidPage(
titlePanel("Sales trends"),titlePanel("People score"),

sidebarLayout(sidebarPanel(

  textInput("text", label = h3("Text input"), value = "Enter text..."),

  numericInput("obs", "Number of observations to view:", 3),

  helpText("Note: while the data view will show only the specified",
           "number of observations, the summary will still be based",
           "on the full dataset."),

  submitButton("Update View")
),

mainPanel(
  h4("Volume: Total sales"),
  verbatimTextOutput("volume"),

  h4("Top people"),
  tableOutput("view")
))))

服务器

library(shiny)
library (dplyr)
df1<-data.frame (Name=c("Carlos","Pete","Carlos","Carlos","Carlos","Pete","Pete","Pete","Pete","Homer"),Sales=(as.integer(c("3","4","7","6","4","9","1","2","1","9"))))
shinyServer(function(input, output) {
output$value <- renderPrint({ input$text })
datasetInput <- reactive({
switch(input$dataset,df1%>% filter(Name %in% "input$text")%>% select(Name, Sales)%>% arrange(desc(Sales)))
})
output$volume <- renderPrint({
dataset <- datasetInput()
sum(dataset$Sales)
})})
4

2 回答 2

5

正如 aosmith 指出的那样，您需要删除引号进行过滤。其次，您应该使用==而不是%in%inside of filter()。第三，您会switch()在其他情况下使用（继续阅读?switch），但在这里您不需要它。

你server.R应该是这样的：

library(shiny)
library(dplyr)
df1 <- data_frame(Name = c("Carlos","Pete","Carlos","Carlos","Carlos","Pete",
                         "Pete","Pete","Pete","Homer"),
                  Sales = c(3, 4, 7, 6, 4, 9, 1, 2, 1, 9))

shinyServer(function(input, output) {
  datasetInput <- reactive({
    df1 %>% filter(Name == input$text) %>% arrange(desc(Sales))
  })
  output$volume <- renderPrint({
    dataset <- datasetInput()
    dataset$Sales
  })
})
于 2015-09-29T15:57:15.280 回答
1

当您使用自己的搜索词进行过滤时，
1. 使用以下内容制作更新功能：reactive
2. 输入其中的功能renderDT

ui = fluidPage(
        textInput('qry', 'Species', value='setosa'),
        DT::DTOutput('tbl'))
server = function(input, output){
        a = reactive({ filter(iris, Species == input$qry })
        output$tbl = renderDT(a())
shinyApp(ui,server)

祝你好运！

于 2019-09-20T01:05:08.737 回答