1 files changed, 28 insertions, 0 deletions
diff --git a/actionview/app/assets/javascripts/utils/dom.coffee b/actionview/app/assets/javascripts/utils/dom.coffee
new file mode 100644
index 0000000000..6bef618147
--- /dev/null
+++ b/actionview/app/assets/javascripts/utils/dom.coffee
@@ -0,0 +1,28 @@
+m = Element.prototype.matches or
+    Element.prototype.matchesSelector or
+    Element.prototype.mozMatchesSelector or
+    Element.prototype.msMatchesSelector or
+    Element.prototype.oMatchesSelector or
+    Element.prototype.webkitMatchesSelector
+
+Rails.matches = (element, selector) ->
+  if selector.exclude?
+    m.call(element, selector.selector) and not m.call(element, selector.exclude)
+  else
+    m.call(element, selector)
+
+# get and set data on a given element using "expando properties"
+# See: https://developer.mozilla.org/en-US/docs/Glossary/Expando
+expando = '_ujsData'
+
+Rails.getData = (element, key) ->
+  element[expando]?[key]
+
+Rails.setData = (element, key, value) ->
+  element[expando] ?= {}
+  element[expando][key] = value
+
+# a wrapper for document.querySelectorAll
+# returns an Array
+Rails.$ = (selector) ->
+  Array.prototype.slice.call(document.querySelectorAll(selector))