diff --git a/app/assets/javascripts/sources.js.coffee b/app/assets/javascripts/sources.js.coffee
--- a/app/assets/javascripts/sources.js.coffee
+++ b/app/assets/javascripts/sources.js.coffee
@@ -8,3 +8,25 @@
     h = $("#editor_text")
     e = ace.edit("editor")
     h.val(e.getValue())
+
+  $("#language_id").on "change", (event) ->
+    text = $("#language_id option:selected").text()
+    mode = 'ace/mode/c_cpp'
+    switch text
+      when 'Pascal' then mode = 'ace/mode/pascal'
+      when 'C++','C' then mode = 'ace/mode/c_cpp'
+      when 'Ruby' then mode = 'ace/mode/ruby'
+      when 'Python' then mode = 'ace/mode/python'
+      when 'Java' then mode = 'ace/mode/java'
+    editor = ace.edit('editor')
+    editor.getSession().setMode(mode)
+
+  e = ace.edit("editor")
+  e.setValue($("#text_haha").val())
+  e.gotoLine(1)
+  $("#language_id").trigger('change')
+
+
+
+
+  return