[英]How to add names from loaded with fileInput data to selectInput in shiny app?
我想制作一個應用程序,用戶可以在其中加載一些數據,而不是自己瀏覽,因此,我現在想將數據集的名稱傳遞給selectInput
為此,我有一個簡單的應用程序,如下所示:
library("shiny")
library("readxl")
# Define UI
ui <- fluidPage(
titlePanel("TKM"),
sidebarLayout(
sidebarPanel(
fileInput(inputId = "input",label = "input xlsx: ", multiple = FALSE, accept = c(".xlsx"))
),
mainPanel(
tableOutput("contents")
)
)
)
# Define server logic
server <- function(input, output) {
df <- reactive({ read_xlsx(input$input$datapath) })
output$contents <- renderTable({ head(df()) })
}
# Run the application
shinyApp(ui = ui, server = server)
因此,如您所見,我的數據是反應性輸入,因此如果我添加一個簡單的數據:
selectInput(inputId = "x", label = "X: ", choices = colnames(df()))
我將無法使用以下應用程序運行: Error in df() : argument "x" is missing, with no default
任何習慣我如何將我的df的名稱傳遞給selectInput?
您可以執行以下操作。
library("shiny")
library("readxl")
# Define UI
ui <- fluidPage(
titlePanel("TKM"),
sidebarLayout(
sidebarPanel(
fileInput(inputId = "input", label = "input xlsx: ", multiple = FALSE, accept = c(".xlsx"))
),
mainPanel(
uiOutput("columns"),
tableOutput("contents")
)
)
)
# Define server logic
server <- function(input, output) {
df <- eventReactive(input$input, {
read_xlsx(input$input$datapath)
})
output$columns <- renderUI({
req(df())
selectInput("x", "Choose a column", choices = colnames(df()))
})
output$contents <- renderTable({
req(df())
head(df())
})
}
# Run the application
shinyApp(ui = ui, server = server)
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