Interact with JavaScript built-in Functions

activate_js is used to insert directly some JavaScript functions in your golem. By default bundle_ressources() load these function automatically for you.

activate_js()

invoke_js(fun, ..., session = shiny::getDefaultReactiveDomain())

Arguments

fun

JS function to be invoked.

...

JSON-like messages to be sent to the triggered JS function

session

The shiny session within which to call sendCustomMessage.

show

Show an element with the jQuery selector provided. Example: golem::invoke_js("show", "#id");.

hide

Hide an element with the jQuery selector provided. Example: golem::invoke_js("hide", "#id").

showid

Show an element with the id provided. Example: golem::invoke_js("showid", "id").

hideid

Hide an element with the id provided. Example: golem::invoke_js("hideid", "id").

showclass

Same as showid, but with class. Example: golem::invoke_js("showclass", "someClass").

hideclass

Same as hideid, but with class. Example: golem::invoke_js("hideclass", "someClass").

showhref

Same as showid, but with a[href*=. Example: golem::invoke_js("showhref", "thinkr.fr").

hidehref

Same as hideid, but with a[href*=. Example: golem::invoke_js("hidehref", "thinkr.fr").

clickon

Click on an element. The full jQuery selector has to be used. Example: golem::invoke_js("clickon", "#id").

disable

Add "disabled" to an element. The full jQuery selector has to be used. Example: golem::invoke_js("disable", ".someClass").

reable

Remove "disabled" from an element. The full jQuery selector has to be used. Example: golem::invoke_js("reable", ".someClass").

alert

Open an alert box with the message(s) provided. Example: golem::invoke_js("alert", "WELCOME TO MY APP");.

prompt

Open a prompt box with the message(s) provided. This function takes a list with message and id list(message = "", id = ""). The output of the prompt will be sent to input$id. Example: golem::invoke_js("prompt", list(message ="what's your name?", id = "name") ).

confirm

Open a confirm box with the message provided. This function takes a list with message and id list(message = "", id = ""). The output of the prompt will be sent to input$id. Example: golem::invoke_js("confirm", list(message ="Are you sure you want to do that?", id = "name") ).

Value

Used for side-effects.

Details

These JavaScript functions can be called from the server with invoke_js. invoke_js can also be used to launch any JS function created inside a Shiny JavaScript handler.

Examples

if (interactive()) {
  library(shiny)
  ui <- fluidPage(
    golem::activate_js(), # already loaded in your golem by `bundle_resources()`
    fluidRow(
      actionButton(inputId = "hidebutton1", label = "hide button1"),
      actionButton(inputId = "showbutton1", label = "show button1"),
      actionButton(inputId = "button1", label = "button1")
    ),
    fluidRow(
      actionButton(inputId = "hideclassA", label = "hide class A"),
      actionButton(inputId = "showclassA", label = "show class A"),
      actionButton(inputId = "buttonA1", label = "button A1", class = "A"),
      actionButton(inputId = "buttonA2", label = "button A2", class = "A"),
      actionButton(inputId = "buttonA3", label = "button A3", class = "A")
    ),
    fluidRow(
      actionButton(inputId = "clickhide", label = "click on 'hide button1' and 'hide class A'"),
      actionButton(inputId = "clickshow", label = "click on 'show button1' and 'show class A'")
    ),
    fluidRow(
      actionButton(inputId = "disableA", label = "disable class A"),
      actionButton(inputId = "reableA", label = "reable class A")
    ),
    fluidRow(
      actionButton(inputId = "alertbutton", label = "alert button"),
      actionButton(inputId = "promptbutton", label = "prompt button"),
      actionButton(inputId = "confirmbutton", label = "confirm button")
    )
  )

  server <- function(input, output, session) {
    observeEvent(input$hidebutton1, {
      golem::invoke_js("hideid", "button1")
    })

    observeEvent(input$showbutton1, {
      golem::invoke_js("showid", "button1")
    })

    observeEvent(input$hideclassA, {
      golem::invoke_js("hideclass", "A")
    })
    observeEvent(input$showclassA, {
      golem::invoke_js("showclass", "A")
    })

    observeEvent(input$clickhide, {
      golem::invoke_js("clickon", "#hidebutton1")
      golem::invoke_js("clickon", "#hideclassA")
    })

    observeEvent(input$clickshow, {
      golem::invoke_js("clickon", "#showbutton1")
      golem::invoke_js("clickon", "#showclassA")
    })

    observeEvent(input$disableA, {
      golem::invoke_js("disable", ".A")
    })
    observeEvent(input$reableA, {
      golem::invoke_js("reable", ".A")
    })

    observeEvent(input$alertbutton, {
      golem::invoke_js("alert", "ALERT!!")
    })

    observeEvent(input$promptbutton, {
      golem::invoke_js("prompt", list(message = "what's your name?", id = "name"))
    })
    observeEvent(input$name, {
      message(paste("input$name", input$name))
    })

    observeEvent(input$confirmbutton, {
      golem::invoke_js("confirm", list(message = "Are you sure?", id = "sure"))
    })
    observeEvent(input$sure, {
      message(paste("input$sure", input$sure))
    })
  }
  shinyApp(ui, server)
}