我正在尝试允许用户从Shiny中的renderDataTable()下载过滤后的数据。例如,在下面的MWE中,用户应该能够转到“查看整个数据表”选项卡,例如,只为Variable2选择“蓝色”值。然后,他们应该能够点击“下载过滤后的数据”按钮并查看过滤后的数据。
但是,由于代码如下,当用户点击“下载过滤数据”按钮时,他们会下载整个(未过滤的)数据。我已经看到了其他示例(例如R - Download Filtered Datatable)并尝试将它们合并到我的代码中,但仍然卡住了。任何建议都会很有帮助。谢谢。
# Load packages
library(shiny)
library(tidyr)
library(dplyr)
# Load data
data_table <- data.frame(Variable1 = sample(LETTERS, 1000, replace=TRUE), Variable2 = sample(c("Orange","Green","Blue","Pink"), 1000, replace=TRUE), Variable3 = sample(c("Square","Triangle","Circle"), 10000, replace=TRUE))
# Define UI
ui <- fluidPage(
tabsetPanel(type = "tabs", id="tabs",
tabPanel("Column Summary", value=2,
sidebarPanel(uiOutput("sidebar_summary")),
verbatimTextOutput("summary")),
tabPanel("See Whole Data Table", value=5,
downloadButton('downLoadFilter',"Download the filtered data"),
verbatimTextOutput("Raw"),
DT::dataTableOutput('ex1'))
)
)
# Define server logic
server <- function(input, output) {
output$sidebar_summary <- renderUI({
if (input$tabs == 2){
print("This is a tab with information.")
}
})
thedata <- reactive(data_table)
output$Raw <- renderPrint({
if(input$tabs == 5){
output$ex1 <- DT::renderDataTable(DT::datatable(thedata(), filter = 'top',escape = FALSE, options = list(pageLength = 10, scrollX='500px',autoWidth = TRUE)))
}
})
output$downLoadFilter <- downloadHandler(
filename = function() {
paste('Filtered data-', Sys.Date(), '.csv', sep = '')
},
content = function(file){
write.csv(thedata(),file)
}
)
}
# Create Shiny object
shinyApp(ui = ui, server = server)
答案 0 :(得分:3)
从您提供的link复制示例似乎有效。
您只需要替换
output$downLoadFilter <- downloadHandler(
filename = function() {
paste('Filtered data-', Sys.Date(), '.csv', sep = '')
},
content = function(file){
write.csv(thedata(),file)
}
)
使用在服务器中
output$downLoadFilter <- downloadHandler(
filename = function() {
paste('Filtered data-', Sys.Date(), '.csv', sep = '')
},
content = function(file){
write.csv(thedata()[input[["ex1_rows_all"]], ],file)
}
)
这就是诀窍。希望它有所帮助!