実際の質問
を介してインターフェイス/作成され、レンダリングされたDataTableがあります。DT::datatableDT::renderDataTable
の引数の値を の値に基づいて選択タイプを条件付きにする方法を教えてください。DT::renderDataTableselectionshiny::radioButtons
例
次の例では、引数selectionの値をDT::renderDataTableラジオ ボタンの入力 ( ) に依存するようにしましたinput$action_selectiontype。
問題：
結果のレンダリングされたテーブルは、行われた選択を事後的に反映しません。の初期値input$action_selectiontypeが考慮されて変更できないようです。
DFLT_action_selectiontype
グローバル変数（singleまたはmultiple）を設定することにより、デフォルト値をいじることができます
グローバル
# Packages ----------------------------------------------------------------
library(shiny)
# Variables ----------------------------------------------------------------
DFLT_action_selectiontype <- "single"
# Functions ---------------------------------------------------------------
createRecord <- function(input, db) {
db$data <- rbind(
db$data,
data.frame(
task = input$task,
time = input$time,
time_unit = "hour",
stringsAsFactors = FALSE
)
)
}
updateRecord <- function(input, db, selection) {
db$data[selection,] <- data.frame(
task = input$task,
time = input$time,
time_unit = "hour",
stringsAsFactors = FALSE
)
}
deleteRecord <- function(db, selection) {
db$data <- db$data[-selection,]
}
niceNames <- function(x) {
s <- strsplit(x, " |_|\\.", perl = TRUE)[[1]]
paste(toupper(substring(s, 1,1)), substring(s, 2),
sep = "", collapse = " ")
}
UI
ui <- fluidPage(
div(
style = "display:inline-block",
p(),
actionButton("action_trigger", "Create")
),
tabsetPanel(
tabPanel(
title = "Selection options",
p(),
radioButtons("action_selectiontype", "Selection type",
choices = c("single", "multiple"),
selected = DFLT_action_selectiontype, inline = TRUE)
)
),
hr(),
uiOutput("ui_input"),
hr(),
h3("Database"),
DT::dataTableOutput("dt")
)
サーバ
server <- function(input, output, session) {
## Initialize DB //
db <- reactiveValues(data = data.frame(
task = character(),
time = numeric(),
time_unit = character()
)[-1,])
## UI control //
ui_control <- reactiveValues(
case = c("hide", "create", "update")[1],
selection = NULL,
refresh = TRUE
)
observeEvent(input$action_trigger, {
ui_control$case <- "create"
})
## Render UI //
output$ui_input <- renderUI({
case <- ui_control$case
if (case == "hide")
return()
## Case dependent input //
if (case == "create") {
task <- ifelse(is.null(tmp <- isolate(input$task)), "", tmp)
time <- ifelse(is.null(tmp <- isolate(input$time)), "", tmp)
buttons <- div(
style = "display:inline-block",
actionButton("action_create", "Create"),
actionButton("action_cancel", "Cancel")
)
updateTextInput(session, "first")
} else if (case == "update") {
task <- db$data[ui_control$selection, "task"]
time <- db$data[ui_control$selection, "time"]
buttons <- div(
style = "display:inline-block",
actionButton("action_update", "Update"),
actionButton("action_cancel", "Cancel"),
p(),
actionButton(
"action_delete",
"Delete",
icon = icon("exclamation-triangle")
)
)
} else {
stop(sprintf("Invalid case: %s", case))
}
tagList(
textInput("task", "Task", task),
numericInput("time", "Time", time),
buttons
)
})
## CRUD operations //
observeEvent(input$action_create, {
createRecord(input, db = db)
ui_control$case <- "hide"
})
observeEvent(input$action_update, {
updateRecord(input, db = db, selection = ui_control$selection)
ui_control$refresh <- NULL
ui_control$refresh <- TRUE
# ui_control$case <- "hide"
})
observeEvent(input$action_delete, {
deleteRecord(db = db, selection = ui_control$selection)
tmp <- ui_control$selection[1] - 1
if (tmp == 0) tmp <- NULL
ui_control$selection <- tmp
ui_control$refresh <- NULL
ui_control$refresh <- TRUE
# ui_control$case <- "hide"
})
observeEvent(input$action_cancel, {
ui_control$case <- "hide"
})
## Selection //
observe({
idx <- input$dt_rows_selected
ui_control$selection <- idx
})
observe({
idx <- ui_control$selection
if (!is.null(idx)) {
ui_control$case <- "update"
} else {
ui_control$case <- "hide"
}
})
## Render table: preparations //
observeEvent(input$action_selectiontype, {
ui_control$refresh <- NULL
ui_control$refresh <- TRUE
})
dt_options = reactive({
list(
dom = "ltipr",
autoWidth = TRUE,
scrollX = TRUE,
lengthMenu = list(
c(3, 5, -1),
c(3, 5, "All")
),
iDisplayLength = 3
)
})
## Render table: DT //
output$dt <- DT::renderDataTable({
if (!ui_control$refresh) {
return()
}
## Note:
## Not really necessary for this example use case as `db$data` already
## introduces a reactive dependency.
## However, that might not always be the case for data I/O when an
## actual database is involved. In this case, this part will most likely
## have to be informed about required re-rendering by an explicit reactive
## value that other parts update upon I/O operations
tmp <- db$data
names(tmp) <- sapply(names(tmp), niceNames)
tmp
}, selection = input$action_selectiontype, options = dt_options())
## DT proxy //
proxy <- DT::dataTableProxy("dt")
## Keep/restory previous selection //
observe({
ui_control$refresh
DT::selectRows(proxy, as.numeric(ui_control$selection))
})
## Resets //
observe({
if (ui_control$case == "create") {
updateTextInput(session, "task", value = sprintf("Test %s", Sys.time()))
updateTextInput(session, "time", value = 1)
}
})
}
走る
shinyApp(ui, server)
Gist の参照アプリ
上記で使用されているセクションは、興味がある場合に備えて、データ化可能な機能に関連するいくつかのもの/学習をバンドルする私の参照アプリにも含まれています。
shiny::runGist("https://gist.github.com/rappster/d48916fbf8e8d0456ae2")