我真的很难找到这个问题的标题,希望它有帮助。
我有一个相当复杂的应用程序,在
actionButton
(本例中为“确认”)触发重新评估为反应表提供数据的reactiveValues
数字后,我无法重置输出。
这会导致
selected
表仅渲染一次,并且无论为其提供数据的表更改了多少次,它都会始终显示与第一次渲染时相同的结果。
从这个例子中你会很容易明白我的意思。相信我,这是我来自的那个极小极大:
library(shiny)
library(DT)
ui <- fluidPage(
DTOutput("table"),
actionButton("checkvalues", "Check")
)
server <- function(input, output, session) {
primedata <- reactiveValues(data = NULL)
primedata$data <- as.numeric(Sys.time()) %% 10000
tabledata <- reactive({
data <- data.frame(rep(primedata$data, 5))
for (i in 1:5) {
data$V1[i] <- as.character(selectInput(paste0("sel", i), "",
choices = c("None selected" = 0,
"Icecream", "Donut"),
selected = 0, width = "120px"))
}
return(data)
})
output$table <- renderDataTable( #Generar tabla
tabledata(), filter = 'top', escape = FALSE, selection = 'none', server = FALSE,
callback = JS("table.rows().every(function(i, tab, row) {
var $this = $(this.node());
$this.attr('id', this.data()[0]);
$this.addClass('shiny-input-container');
});
Shiny.unbindAll(table.table().node());
Shiny.bindAll(table.table().node());")
)
# helper function for reading inputs in DT
shinyValue = function(id, len) {
unlist(lapply(seq_len(len), function(i) {
value = input[[paste0(id, i)]]
if (is.null(value)) NA else value
}))
}
observeEvent(input$checkvalues, {
datos <- tabledata()
selected <- cbind(datos, data.frame(N = shinyValue("sel", nrow(datos))))
selected <- selected %>% group_by(N) %>% summarise("see" = n())
showModal(modalDialog(
title = HTML('<h3 style="text-align:center;">Problem: this table will keep showing the same results as the first one presented</h3>'),
renderDT(datatable(selected, options = list(dom = 't', ordering = F))),
footer = actionButton("Confirm", "Confirm")))
})
observeEvent(input$Confirm, {
primedata$data <- as.numeric(Sys.time()) %% 10000
removeModal()
})
}
shinyApp(ui, server)
当您更改
primedata$data
(通过单击“确认”按钮)时,这将重新呈现表格,并且您必须在此之前取消绑定:
ui <- fluidPage(
tags$head(tags$script(
HTML(
"Shiny.addCustomMessageHandler('unbindDT', function(id) {
var $table = $('#'+id).find('table');
if($table.length > 0){
Shiny.unbindAll($table.DataTable().table().node());
}
})")
)),
DTOutput("table"),
actionButton("checkvalues", "Check")
)
observeEvent(input$Confirm, {
session$sendCustomMessage("unbindDT", "table")
primedata$data <- as.numeric(Sys.time()) %% 10000
removeModal()
})