How to use a highcharter event function in shiny module - r

Question

My question is related to this post. By clicking on a bar in a bar plot I want to display the selected category. When rewriting the code into modules I do not get the expected result (i.e. display the category in text field), instead nothing happens not even an error message pops up. What am I doing wrong?
library(shiny)
library(highcharter)
myModuleUI <- function(id){
ns <- NS(id)
fluidPage(
column(width = 8, highchartOutput(ns("hcontainer"), height = "500px")),
column(width = 4, textOutput(ns("text")))
)
}
myModule <- function(input, output, session){
a <- data.frame(b = LETTERS[1:10], c = 11:20, d = 21:30, e = 31:40)
output$hcontainer <- renderHighchart({
canvasClickFunction <- JS("function(event) {Shiny.onInputChange('canvasClicked', [this.name, event.point.category]);}")
legendClickFunction <- JS("function(event) {Shiny.onInputChange('legendClicked', this.name);}")
highchart() %>%
hc_xAxis(categories = a$b) %>%
hc_add_series(name = "c", data = a$c) %>%
hc_add_series(name = "d", data = a$d) %>%
hc_add_series(name = "e", data = a$e) %>%
hc_plotOptions(series = list(stacking = FALSE, events = list(click = canvasClickFunction, legendItemClick = legendClickFunction))) %>%
hc_chart(type = "column")
})
makeReactiveBinding("outputText")
observeEvent(input$canvasClicked, {
outputText <<- paste0("You clicked on series ", input$canvasClicked[1], " and the bar you clicked was from category ", input$canvasClicked[2], ".")
})
observeEvent(input$legendClicked, {
outputText <<- paste0("You clicked into the legend and selected series ", input$legendClicked, ".")
})
output$text <- renderText({
outputText
})
}
ui <- shinyUI(fluidPage(
myModuleUI("myMod")
))
server <- function(input, output){
callModule(myModule, "myMod")
}

Answer 1

The thing with modules is that you need to pass the namespace. If you get the namespace in the beginning of your module ns <- session$ns and then adjust the JavaScript function like this
canvasClickFunction <- JS(paste0("function(event) {Shiny.onInputChange('", ns('canvasClicked'), "', [this.name, event.point.category]);}"))
legendClickFunction <- JS(paste0("function(event) {Shiny.onInputChange('", ns('legendClicked'), "', this.name);}"))
your code should work.