Hide title field for primary progress bars

These bars don't have a title.

app/assets/javascripts/forms.js.coffee

@@ -28,9 +28,22 @@ App.Forms =
       input: ->
         $("[name='#{this.name}']").val($(this).val())
 
+  hideOrShowFieldsAfterSelection: ->
+    $("[name='progress_bar[kind]']").on
+      change: ->
+        title_field = $("[name^='progress_bar'][name$='[title]']").parent()
+
+        if this.value == "primary"
+          title_field.addClass("hide")
+        else
+          title_field.removeClass("hide")
+
+    $("[name='progress_bar[kind]']").change()
+
   initialize: ->
     App.Forms.disableEnter()
     App.Forms.submitOnChange()
     App.Forms.toggleLink()
     App.Forms.synchronizeInputs()
+    App.Forms.hideOrShowFieldsAfterSelection()
     false

spec/shared/features/progressable.rb

@@ -34,6 +34,8 @@ shared_examples "progressable" do |factory_name, path_name|
 
         select "Primary", from: "Type"
 
+        expect(page).not_to have_field "Title"
+
         fill_in "Current progress", with: 43
         click_button "Create Progress bar"
 
@@ -65,6 +67,9 @@ shared_examples "progressable" do |factory_name, path_name|
         visit path
         within("#progress_bar_#{bar.id}") { click_link "Edit" }
 
+        expect(page).to have_field "Current progress"
+        expect(page).not_to have_field "Title"
+
         fill_in "Current progress", with: 44
         click_button "Update Progress bar"