[英]Sending messages from Shiny to JavaScript
每次單擊應用程序的選項卡時,我都試圖從Shiny調用JavaScript函數。 我需要將標簽名稱發送到自定義js函數。 作為最簡單的選項,我從R調用alert()
函數並將選項卡的名稱傳遞給它。 出於某種原因,盡管我復制了示例,但我的代碼無法正常工作,並且沒有出現帶有消息的窗口。
library(shiny)
library(shinydashboard)
library(shinyjs)
ui = dashboardPage(
dashboardHeader(title = "Shiny"),
dashboardSidebar(
sidebarMenu(id = "tabs",
menuItem("Section_1", tabName = "section_1", icon = icon("align-justify"),
startExpanded = TRUE, selected = TRUE,
menuSubItem("Subsection 1", tabName = "report_1", selected = TRUE),
menuSubItem("Subsection 2", tabName = "report_2")),
menuItem("Section_2", tabName = "section_2", icon = icon("align-justify"))
)
),
dashboardBody(
useShinyjs(),
tags$head(tags$script("Shiny.addCustomMessageHandler('handler1', alert(tab_name))")),
tabItems(
tabItem("report_1", h1(id = "a", "a")),
tabItem("report_2", h1(id = "b", "b")),
tabItem("section_2", h1(id = "c", "c")))
)
)
server <- function(input, output, session) {
observe({
if(input$tabs == "report_1") {
print(input$tabs)
tab_name = as.character(input$tabs)
session$sendCustomMessage(type = "handler1", tab_name)
} else if(input$tabs == "report_2"){
print(input$tabs)
tab_name = as.character(input$tabs)
session$sendCustomMessage(type = "handler1", tab_name)
} else if (input$tabs == "section_2"){
print(input$tabs)
tab_name = as.character(input$tabs)
session$sendCustomMessage(type = "handler1", tab_name)
}
})
}
shinyApp(ui=ui, server=server)
像這樣在addCustomMessageHandler
內編寫一個函數:
library(shiny)
library(shinydashboard)
library(shinyjs)
ui = dashboardPage(
dashboardHeader(title = "Shiny"),
dashboardSidebar(
sidebarMenu(id = "tabs",
menuItem("Section_1", tabName = "section_1", icon = icon("align-justify"),
startExpanded = TRUE, selected = TRUE,
menuSubItem("Subsection 1", tabName = "report_1", selected = TRUE),
menuSubItem("Subsection 2", tabName = "report_2")),
menuItem("Section_2", tabName = "section_2", icon = icon("align-justify"))
)
),
dashboardBody(
useShinyjs(),
tags$head(tags$script('Shiny.addCustomMessageHandler("handler1", function(message) {
alert(JSON.stringify(message));
})')),
tabItems(
tabItem("report_1", h1(id = "a", "a")),
tabItem("report_2", h1(id = "b", "b")),
tabItem("section_2", h1(id = "c", "c")))
)
)
server <- function(input, output, session) {
observe({
if(input$tabs == "report_1") {
print(input$tabs)
tab_name = as.character(input$tabs)
session$sendCustomMessage(type = "handler1", tab_name)
} else if(input$tabs == "report_2"){
print(input$tabs)
tab_name = as.character(input$tabs)
session$sendCustomMessage(type = "handler1", tab_name)
} else if (input$tabs == "section_2"){
print(input$tabs)
tab_name = as.character(input$tabs)
session$sendCustomMessage(type = "handler1", tab_name)
}
})
}
shinyApp(ui=ui, server=server)
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