1 files changed, 26 insertions, 0 deletions
diff --git a/actionview/app/assets/javascripts/rails-ujs/features/confirm.coffee b/actionview/app/assets/javascripts/rails-ujs/features/confirm.coffee
new file mode 100644
index 0000000000..72b5aaa218
--- /dev/null
+++ b/actionview/app/assets/javascripts/rails-ujs/features/confirm.coffee
@@ -0,0 +1,26 @@
+#= require_tree ../utils
+
+{ fire, stopEverything } = Rails
+
+Rails.handleConfirm = (e) ->
+  stopEverything(e) unless allowAction(this)
+
+# For 'data-confirm' attribute:
+# - Fires `confirm` event
+# - Shows the confirmation dialog
+# - Fires the `confirm:complete` event
+#
+# Returns `true` if no function stops the chain and user chose yes `false` otherwise.
+# Attaching a handler to the element's `confirm` event that returns a `falsy` value cancels the confirmation dialog.
+# Attaching a handler to the element's `confirm:complete` event that returns a `falsy` value makes this function
+# return false. The `confirm:complete` event is fired whether or not the user answered true or false to the dialog.
+allowAction = (element) ->
+  message = element.getAttribute('data-confirm')
+  return true unless message
+
+  answer = false
+  if fire(element, 'confirm')
+    try answer = confirm(message)
+    callback = fire(element, 'confirm:complete', [answer])
+
+  answer and callback