我想知道在下面的示例中哪个事件在多个 ObserveEvent()
中被触发.
ui <- fluidPage(
numericInput("a", "a", 0),
textInput("b", "b")
)
server <- function(input, output, session) {
observeEvent({
input$a
input$b
},{
# If only input$a is fired, I want to know that is input$a
})
}
shinyApp(ui, server)
或者唯一的解决办法是有两个
ObserveEvent()
喜欢第二个链接?像那样 ?ui <- fluidPage(
numericInput("a", "a", 0),
textInput("b", "b")
)
server <- function(input, output, session) {
observeEvent({
input$a
},{
my_function_or_reactive_function(input,1)
})
observeEvent({
input$b
},{
my_function_or_reactive_function(input,2)
})
}
shinyApp(ui, server)
关联:
最佳答案
您可以使用 Shiny 的 JS event shiny:inputchanged
检查哪个输入改变了:
ui <- fluidPage(
tags$head(
tags$script(
"$(document).on('shiny:inputchanged', function(event) {
if (event.name != 'changed') {
Shiny.setInputValue('changed', event.name);
}
});"
)
),
numericInput("a", "a", 0),
textInput("b", "b"),
textInput("c", "c"),
textOutput("changedInputs"),
textOutput("aFired")
)
server <- function(input, output, session) {
output$changedInputs <- renderText({
paste("Outside observer: Latest input fired:", paste(input$changed, collapse = ", "))
})
observeEvent({
c(input$a,
input$b)
}, {
req(input$changed)
if (input$changed == "a") {
output$aFired <- renderText("Inside observer: input$a was fired")
} else if (input$changed == "b") {
output$aFired <- renderText("Inside observer: input$b was fired")
} else if (input$changed == "c") {
output$aFired <- renderText("Inside observer: input$c was fired")
}
}, ignoreInit = TRUE)
}
shinyApp(ui, server)
:
编辑 - 来自@TristanTran 的请求使用
renderUI
:library(shiny)
ui <- fluidPage(
tags$head(
tags$script(
"$(document).on('shiny:inputchanged', function(event) {
if (event.name != 'changed') {
Shiny.setInputValue('changed', event.name);
}
});"
)
),
uiOutput("serverside"),
textOutput("changedInputs"),
textOutput("aFired")
)
server <- function(input, output, session) {
output$changedInputs <- renderText({
paste("Outside observer: Latest input fired:", paste(input$changed, collapse = ", "))
})
output$serverside <- renderUI({
tagList(
numericInput("a", "a", 0),
textInput("b", "b"),
textInput("c", "c")
)
})
observeEvent({
c(input$a,
input$b)
}, {
req(input$changed)
if (input$changed == "a") {
output$aFired <- renderText("Inside observer: input$a was fired")
} else if (input$changed == "b") {
output$aFired <- renderText("Inside observer: input$b was fired")
} else if (input$changed == "c") {
output$aFired <- renderText("Inside observer: input$c was fired")
}
}, ignoreInit = TRUE)
}
shinyApp(ui, server)
关于r - 获取在 Shiny 中触发的事件?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/56770222/