请尝试以下操作:
library(shiny)
library(shinydashboard)
readUI <- function(id, label = "Read") {
ns <- NS(id)
tagList(
valueBoxOutput(ns("showX"))
)
}
read <- function(input, output, session, x) {
ns <- session$ns
output$showX <- renderValueBox({
valueBox(x(), "x")
})
}
writeUI <- function(id, label = "Write") {
ns <- NS(id)
tagList(
selectizeInput(ns("selectX"), "Select a value for x", choices = 1:10),
actionButton(ns("submit"), "Submit")
)
}
write <- function(input, output, session) {
ns <- session$ns
toReturn <- reactiveValues(x = data.frame(a=c(1), b=c(2), c=c(3)), trigger = 0)
observeEvent(input$submit, {
toReturn$x$a <- as.numeric(input$selectX)
toReturn$trigger <- toReturn$trigger + 1
})
return(toReturn)
}
readAndWriteUI <- function(id, label = "ReadAndWrite") {
ns <- NS(id)
tagList(
valueBoxOutput(ns("showX")),
selectizeInput(ns("selectX"), "Select a value for x", choices = 1:10),
actionButton(ns("submit"), "Submit")
)
}
readAndWrite <- function(input, output, session, x) {
ns <- session$ns
toReturn <- reactiveValues(x = x, trigger = 0)
observeEvent(toReturn, {
toReturn$x <- toReturn$x()
}, once = TRUE)
output$showX <- renderValueBox({
valueBox(x(), "x")
})
observeEvent(input$submit, {
toReturn$x$a <- as.numeric(input$selectX)
toReturn$trigger <- toReturn$trigger + 1
})
return(toReturn)
}
ui <- dashboardPage(
dashboardHeader(title = "Example"),
dashboardSidebar(),
dashboardBody(
tabsetPanel(id = "mainTabSetPanel",
tabPanel("Read", readUI("Read")),
tabPanel("Write", writeUI("Write")),
tabPanel("ReadAndWrite", readAndWriteUI("ReadAndWrite"))
)
)
)
server <- function(input, output, session) {
rv <- reactiveValues(x = data.frame(a=c(1), b=c(2), c=c(3)))
callModule(read, "Read", reactive(rv$x))
output_Write <- callModule(write, "Write")
output_ReadAndWrite <- callModule(readAndWrite, "ReadAndWrite", reactive(rv$x))
observeEvent(output_Write$trigger, {
print("Updating x from Write")
rv$x <- output_Write$x
#updateTabsetPanel(session, "mainTabSetPanel", selected = "Read")
}, ignoreInit = TRUE)
observeEvent(output_ReadAndWrite$trigger, {
print("Updating x from ReadAndWrite")
rv$x <- output_ReadAndWrite$x
#updateTabsetPanel(session, "mainTabSetPanel", selected = "Read")
}, ignoreInit = TRUE)
}
shinyApp(ui, server)
关键是在行中添加toReturn$x <- toReturn$x()
当你正在处理reactives
and reactiveValues
但这只能运行一次,因此如下:
observeEvent(toReturn, {
toReturn$x <- toReturn$x()
}, once = TRUE)
我发现的一个独立问题是你的代码即使对于write
模块。所以,我改变了trigger = NULL
to trigger = 0
(因为你不能添加到NULL
值),但随后必须添加ignoreInit = TRUE
为了observeEvents
in the server
在启动时忽略它们。
请随意测试这些,通过一一取出我的添加来了解该过程。如果有什么需要澄清的请在下面评论。