How to get a click event on a graph in module shiny - r

Question

I'm new to shiny.
When I try to handle a click or brush event without using modules, everything works ok.
What should I do to make the events work inside the module?
There is simple code
#MODULE
plUI <- function(id) {
tagList(
selectInput(NS(id, "var"), "Variable", choices = names(mtcars)),
numericInput(NS(id, "bins"), "bins", value = 10, min = 1),
plotOutput(NS(id, "hist"), click = "plot_click"),
verbatimTextOutput("info")
)
}
plServer <- function(id) {
moduleServer(id, function(input, output, session) {
data <- reactive(mtcars[[input$var]])
output$hist <- renderPlot({
plot(data(), breaks = input$bins, main = input$var)
}, res = 96)
output$info <- renderPrint({
req(input$plot_click)
x <- round(input$plot_click$x, 2)
y <- round(input$plot_click$y, 2)
cat("[", x, ", ", y, "]", sep = "")
})
})
}
#------------------------------UI-------------------------------------
ui <- fluidPage(
ui <- fluidPage(
plUI("p1"),
)
)
#------------------------------SERVER-------------------------------------
server <- function(input, output, session) {
plServer("p1")
}
shinyApp(ui, server)

Answer 1

Instead of NS(id, "var") for each id, you can do ns <- NS(id) and then use ns("var") and so on.
plot_click is also an id so wrap it in ns as well.
You had forgotten NS in verbatimTextOutput("info").
The main ui had two fluidPage that probably was by mistake so removed it.
library(shiny)
plUI <- function(id) {
ns <- NS(id)
tagList(
selectInput(ns("var"), "Variable", choices = names(mtcars)),
numericInput(ns("bins"), "bins", value = 10, min = 1),
plotOutput(ns("hist"), click = ns("plot_click")),
verbatimTextOutput(ns("info"))
)
}
plServer <- function(id) {
moduleServer(id, function(input, output, session) {
ns <- session$ns
data <- reactive(mtcars[[input$var]])
output$hist <- renderPlot({
plot(data(), breaks = input$bins, main = input$var)
}, res = 96)
output$info <- renderPrint({
req(input$plot_click)
x <- round(input$plot_click$x, 2)
y <- round(input$plot_click$y, 2)
cat("[", x, ", ", y, "]", sep = "")
})
})
}
#------------------------------UI-------------------------------------
ui <- fluidPage(
plUI("p1")
)
#------------------------------SERVER-------------------------------------
server <- function(input, output, session) {
plServer("p1")
}
shinyApp(ui, server)