1 files changed, 37 insertions, 0 deletions
diff --git a/app/assets/javascripts/breakpoints.coffee b/app/assets/javascripts/breakpoints.coffee
new file mode 100644
index 00000000000..5457430f921
--- /dev/null
+++ b/app/assets/javascripts/breakpoints.coffee
@@ -0,0 +1,37 @@
+class @Breakpoints
+  instance = null;
+
+  class BreakpointInstance
+    BREAKPOINTS = ["xs", "sm", "md", "lg"]
+
+    constructor: ->
+      @setup()
+
+    setup: ->
+      allDeviceSelector = BREAKPOINTS.map (breakpoint) ->
+        ".device-#{breakpoint}"
+      return if $(allDeviceSelector.join(",")).length
+
+      # Create all the elements
+      els = $.map BREAKPOINTS, (breakpoint) ->
+        "<div class='device-#{breakpoint} visible-#{breakpoint}'></div>"
+      $("body").append els.join('')
+
+    visibleDevice: ->
+      allDeviceSelector = BREAKPOINTS.map (breakpoint) ->
+        ".device-#{breakpoint}"
+      $(allDeviceSelector.join(",")).filter(":visible")
+
+    getBreakpointSize: ->
+      $visibleDevice = @visibleDevice
+      # the page refreshed via turbolinks
+      if not $visibleDevice().length
+        @setup()
+      $visibleDevice = @visibleDevice()
+      return $visibleDevice.attr("class").split("visible-")[1]
+
+  @get: ->
+    return instance ?= new BreakpointInstance
+
+$ =>
+  @bp = Breakpoints.get()