我想根据某些输入更改闪亮仪表板框的状态/样式,基本上是向用户发出警告信号(参见下面的示例)。实际上,我已经设法通过使用 shinyjs 及其 extendShinyjs 功能解决了我的问题。但我想了解为什么我最初的尝试——基于 shinyjs 的 removeClass / addClass 函数——失败了。所以,我的问题是:为什么下面示例应用程序中第二个框中的方法会失败?
运行应用程序时,只需输入大于 12 的值;)
library(shiny)
library(shinydashboard)
library(shinyjs)
jscode <- "
shinyjs.warningBox = function(boxid) {
$('#' + boxid).parent().removeClass('box-success').addClass('box-warning');
};
shinyjs.successBox = function(boxid) {
$('#' + boxid).parent().removeClass('box-warning').addClass('box-success');
}
"
dbBody <- dashboardBody(
useShinyjs(),
extendShinyjs(text = jscode),
box(
id = "input-box-1",
title = "Here it works",
status = "success",
solidHeader = TRUE,
numericInput(
inputId = "n1",
label = "Do not enter anything larger than 12",
value = 10)
),
box(
id = "input-box-2",
title = "Here it doesn't",
status = "success",
solidHeader = TRUE,
numericInput(
inputId = "n2",
label = "Do not enter anything larger than 12",
value = 10)
)
)
server <- function(input, output) {
observe({
if (input$n1 > 12) js$warningBox("input-box-1")
else js$successBox("input-box-1")
})
observe({
selector <- "$('#input-box-2').parent()"
if (input$n2 > 12) {
shinyjs::removeClass(
selector = selector, class = "box-success")
shinyjs::addClass(
selector = selector, class = "box-warning")
} else {
shinyjs::removeClass(
selector = selector, class = "box-warning")
shinyjs::addClass(
selector = selector, class = "box-success")
}
})
}
shinyApp(
ui = dashboardPage(
dashboardHeader(title = "Box styles"),
dashboardSidebar(),
dbBody
),
server = server
)