Extract ref switcher into a partial

Also moves onchange JS to projects.js.coffee

app/assets/javascripts/projects.js.coffee

@@ -10,11 +10,15 @@ window.Projects = ->
   $('form #project_default_branch').chosen()
   disableButtonIfEmptyField '#project_name', '.project-submit'
-# Git clone panel switcher
 $ ->
+  # Git clone panel switcher
   scope = $ '.project_clone_holder'
   if scope.length > 0
     $('a, button', scope).click ->
       $('a, button', scope).removeClass 'active'
       $(@).addClass 'active'
       $('#project_clone', scope).val $(@).data 'clone'
+
+  # Ref switcher
+  $('.project-refs-select').on 'change', ->
+    $(@).parents('form').submit()

app/views/commits/_head.html.haml

 %ul.nav.nav-tabs
-  %li
-    = form_tag switch_project_refs_path(@project), method: :get, class: "project-refs-form" do
-      = select_tag "ref", grouped_options_refs, onchange: "$(this.form).trigger('submit');", class: "project-refs-select chosen"
-      = hidden_field_tag :destination, "commits"
-
+  %li= render partial: 'shared/ref_switcher', locals: {destination: 'commits'}
   %li{class: "#{'active' if current_page?(project_commits_path(@project)) }"}
     = link_to project_commits_path(@project) do
       Commits
@@ -20,7 +16,6 @@
       Tags
       %span.badge= @project.repo.tag_count
-
   - if current_page?(project_commits_path(@project)) && current_user.private_token
     %li.right
       %span.rss-icon

app/views/refs/_head.html.haml

 %ul.nav.nav-tabs
   %li
-    = form_tag switch_project_refs_path(@project), method: :get, class: "project-refs-form", remote: true do
-      = select_tag "ref", grouped_options_refs, onchange: "$(this.form).trigger('submit');", class: "project-refs-select chosen"
-      = hidden_field_tag :destination, "tree"
-      = hidden_field_tag :path, params[:path]
+    = render partial: 'shared/ref_switcher', locals: {destination: 'tree', path: params[:path]}
   %li{class: "#{'active' if (controller.controller_name == "refs") }"}
     = link_to tree_project_ref_path(@project, @ref) do
       Source

app/views/shared/_ref_switcher.html.haml

+= form_tag switch_project_refs_path(@project), method: :get, class: "project-refs-form" do
+  = select_tag "ref", grouped_options_refs, class: "project-refs-select chosen"
+  = hidden_field_tag :destination, destination
+  - if respond_to?(:path)
+    = hidden_field_tag :path, path