到目前为止,我选择了包含文档名称的datatable的一行,并从数据库中获取有关所选文档的信息。此信息的概述位于另一个选项卡中。现在,我希望有一个按钮" next“来选择选中后的行,以显示下一个文档的信息。我不能使用rownumber+1,因为我的数据表是有序的。是否有一种方法可以通过使用按钮在选定行之后获取行?
更新:
library(DT)
# ui
ui <- tagList(
ui <- basicPage(
h2("My Table"),
DT::dataTableOutput("DT_show_docs"),
textOutput("printScore"),
actionButton("next_doc", "Next Document")
)
)
# Server
server <- function(input, output, session) {
doc_overview <- reactive({
df <- data.frame(Doc_ID = seq(1,100), Filename = paste0("File_",seq(1,100)), Score = sample(1:10,100,replace=TRUE), Approved = rep(c("No", "Yes"), times = c(95,5)), Date = rep(seq(as.Date("2018/01/01"), as.Date("2018/1/10"), "days"), length.out=100))
return(df)
})
output$DT_show_docs <- renderDataTable({
DT::datatable(doc_overview(),
options = list(
searching = FALSE,
order = list(list(3, 'desc'))),
selection = "single")
})
output$printScore <- renderText({
row <- input$DT_show_docs_rows_selected
text <- doc_overview()[row, "Filename"]
})
observeEvent(input$next_doc, {
# Function to select next row/document from datatable. When the button is clicked,
# and the first row is selected at this moment, I want to select/print the second
# row and so on.
})
}
# app
shinyApp(ui = ui, server = server)发布于 2018-10-19 14:26:53
我有一种感觉(可能是错的),这可能是一个XY问题陷阱的情况,也就是说,你是在寻求帮助,试图解决一个问题,而不是潜在的问题本身。如果是这样的话,最好再问一个问题来解释您的核心需求,这可能会产生一个更简单的整体解决方案。虽然我的解决方案很简单,但整个过程就像是一个不必要的复杂问题。
不管怎样,这有个办法。您可以使用input$tableId_rows_all获取数据表上行的当前顺序,它给出了所有页面上的行的索引(在表被搜索字符串过滤后)。output$test实时显示了这个顺序.现在,您只需要在每次用户点击next_doc操作按钮时循环这个顺序。
即使您重新排序您的行或手动更改选定的行,此解决方案也会工作。
library(shiny)
library(DT)
ui <- tagList(
ui <- basicPage(
h2("My Table"),
DT::dataTableOutput("DT_show_docs"),
textOutput("printScore"),
actionButton("next_doc", "Next Document"),
verbatimTextOutput("test")
)
)
# Server
server <- function(input, output, session) {
doc_overview <- reactive({
df <- data.frame(Doc_ID = seq(1,12),
Filename = paste0("File_",seq(1,12)),
Score = sample(1:10,12,replace=TRUE),
Approved = rep(c("No", "Yes"), times = c(5,7)),
Date = rep(seq(as.Date("2018/01/01"), as.Date("2018/1/10"), "days"), length.out=12))
return(df)
})
output$DT_show_docs <- renderDataTable({
DT::datatable(doc_overview(),
options = list(
searching = FALSE,
order = list(list(3, 'desc'))),
selection = "single")
})
row_index <- reactiveValues(index = 1)
observe({ # reset row_index when you manually select any row
row_index$index <- which(input$DT_show_docs_rows_selected == input$DT_show_docs_rows_all)
})
DT_show_docs_proxy <- dataTableProxy("DT_show_docs")
output$printScore <- renderText({
row <- input$DT_show_docs_rows_selected
text <- doc_overview()[row, "Filename"]
})
observeEvent(input$next_doc, {
# Function to select next row/document from datatable. When the button is clicked,
# and the first row is selected at this moment, I want to select/print the second
# row and so on.
req(input$DT_show_docs_rows_selected) # must select some row before using next_doc button
row_order <- input$DT_show_docs_rows_all # gives current order of rows
row_index$index <- isolate(row_index$index) + 1 # cycles throw the order one by one when you click next_button
selectRows(DT_show_docs_proxy, selected = row_order[row_index$index]) # selects the row of current index
})
output$test <- renderPrint({
input$DT_show_docs_rows_all # shows the order of rows in real time
})
}
# app
shinyApp(ui = ui, server = server)https://stackoverflow.com/questions/52880234
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