focus search on drop

lms/static/coffee/src/discussion/views/discussion_thread_list_view.coffee

@@ -137,12 +137,13 @@ class @DiscussionThreadListView extends Backbone.View
     @$(".browse").toggleClass('is-dropped')
     if @$(".browse").hasClass('is-dropped')
       @$(".browse-topic-drop-menu-wrapper").show()
-      $('body').bind 'click', @toggleTopicDrop
-      $('body').bind 'keydown', @setActiveItem
+      $(".browse-topic-drop-search-input").focus()
+      $("body").bind "click", @toggleTopicDrop
+      $("body").bind "keydown", @setActiveItem
     else
       @$(".browse-topic-drop-menu-wrapper").hide()
-      $('body').unbind 'click', @toggleTopicDrop
-      $('body').unbind 'keydown', @setActiveItem
+      $("body").unbind "click", @toggleTopicDrop
+      $("body").unbind "keydown", @setActiveItem
 
   setTopic: (event) ->
     item = $(event.target).closest('a')

lms/static/coffee/src/discussion/views/new_post_view.coffee

@@ -38,9 +38,10 @@ class @NewPostView extends Backbone.View
         @menuOpen = true
         @dropdownButton.addClass('dropped')
         @topicMenu.show()
+        $(".form-topic-drop-search-input").focus()
 
-        $('body').bind 'keydown', @setActiveItem
-        $('body').bind 'click', @hideTopicDropdown
+        $("body").bind "keydown", @setActiveItem
+        $("body").bind "click", @hideTopicDropdown
 
         # Set here because 1) the window might get resized and things could
         # change and 2) can't set in initialize because the button is hidden
@@ -52,8 +53,8 @@ class @NewPostView extends Backbone.View
         @dropdownButton.removeClass('dropped')
         @topicMenu.hide()
 
-        $('body').unbind 'keydown', @setActiveItem
-        $('body').unbind 'click', @hideTopicDropdown
+        $("body").unbind "keydown", @setActiveItem
+        $("body").unbind "click", @hideTopicDropdown
 
     setTopic: (event) ->
         $target = $(event.target)