Review changes and final formatting

app/assets/javascripts/gl_dropdown.js.coffee

 class GitLabDropdownFilter
   BLUR_KEYCODES = [27, 40]
   ARROW_KEY_CODES = [38, 40]
-  HAS_VALUE_CLASS = "has-value"
+  HAS_VALUE_CLASS = 'has-value'
 
   constructor: (@input, @options) ->
     {
@@ -9,7 +9,7 @@ class GitLabDropdownFilter
     } = @options
 
     $inputContainer = @input.parent()
-    $clearButton = $inputContainer.find('.js-dropdown-input-clear')
+    $clearButton = $inputContainer.find '.js-dropdown-input-clear'
 
     @indeterminateIds = []
 
@@ -18,24 +18,23 @@ class GitLabDropdownFilter
       e.preventDefault()
       e.stopPropagation()
       @input
-        .val('')
-        .trigger('keyup')
+        .val ''
+        .trigger 'keyup'
         .focus()
 
     # Key events
-    timeout = ""
-    @input.on "keyup", (e) =>
+    timeout = ''
+    @input.on 'keyup', (e) =>
       keyCode = e.which
 
       return if ARROW_KEY_CODES.indexOf(keyCode) >= 0
 
-      if @input.val() isnt "" and !$inputContainer.hasClass HAS_VALUE_CLASS
+      if @input.val() isnt '' and not $inputContainer.hasClass HAS_VALUE_CLASS
         $inputContainer.addClass HAS_VALUE_CLASS
-      else if @input.val() is "" and $inputContainer.hasClass HAS_VALUE_CLASS
+      else if @input.val() is '' and $inputContainer.hasClass HAS_VALUE_CLASS
         $inputContainer.removeClass HAS_VALUE_CLASS
 
-      if keyCode is 13
-        return false
+      return false if keyCode is 13
 
       # Only filter asynchronously only if option remote is set
       if @options.remote
@@ -47,13 +46,13 @@ class GitLabDropdownFilter
             @input.blur()
 
           @options.query @input.val(), (data) =>
-            @options.callback(data)
+            @options.callback data
         , 250
       else
         @filter @input.val()
 
   shouldBlur: (keyCode) ->
-    return BLUR_KEYCODES.indexOf(keyCode) >= 0
+    BLUR_KEYCODES.indexOf(keyCode) >= 0
 
   filter: (search_text) ->
     @options.onFilter(search_text) if @options.onFilter
@@ -69,9 +68,8 @@ class GitLabDropdownFilter
         #   { prop: 'baz' }
         # ]
         if _.isArray(data)
-          results = fuzzaldrinPlus.filter(data, search_text,
+          results = fuzzaldrinPlus.filter data, search_text,
             key: @options.keys
-          )
         else
           # If data is grouped therefore an [object Object]. e.g.
           # {
@@ -87,9 +85,8 @@ class GitLabDropdownFilter
           if gl.utils.isObject data
             results = {}
             for key, group of data
-              tmp = fuzzaldrinPlus.filter(group, search_text,
+              tmp = fuzzaldrinPlus.filter group, search_text,
                 key: @options.keys
-              )
 
               if tmp.length
                 results[key] = tmp.map (item) -> item
@@ -100,10 +97,10 @@ class GitLabDropdownFilter
 
       if search_text
         elements.each ->
-          $el = $(@)
-          matches = fuzzaldrinPlus.match($el.text().trim(), search_text)
+          $el = $(this)
+          matches = fuzzaldrinPlus.match $el.text().trim(), search_text
 
-          unless $el.is('.dropdown-header')
+          unless $el.is '.dropdown-header'
             if matches.length
               $el.show()
             else
@@ -115,38 +112,31 @@ class GitLabDropdownRemote
   constructor: (@dataEndpoint, @options) ->
 
   execute: ->
-    if typeof @dataEndpoint is "string"
+    if typeof @dataEndpoint is 'string'
       @fetchData()
-    else if typeof @dataEndpoint is "function"
-      if @options.beforeSend
-        @options.beforeSend()
+    else if typeof @dataEndpoint is 'function'
+      @options.beforeSend() if @options.beforeSend
 
       # Fetch the data by calling the data funcfion
-      @dataEndpoint "", (data) =>
-        if @options.success
-          @options.success(data)
-
-        if @options.beforeSend
-          @options.beforeSend()
+      @dataEndpoint '', (data) =>
+        @options.success(data) if @options.success
+        @options.beforeSend() if @options.beforeSend
 
   # Fetch the data through ajax if the data is a string
   fetchData: ->
-    $.ajax(
+    $.ajax
       url: @dataEndpoint,
       dataType: @options.dataType,
       beforeSend: =>
-        if @options.beforeSend
-          @options.beforeSend()
+        @options.beforeSend() if @options.beforeSend
       success: (data) =>
-        if @options.success
-          @options.success(data)
-    )
+        @options.success(data) if @options.success
 
 class GitLabDropdown
-  LOADING_CLASS = "is-loading"
-  PAGE_TWO_CLASS = "is-page-two"
-  ACTIVE_CLASS = "is-active"
-  INDETERMINATE_CLASS = "is-indeterminate"
+  LOADING_CLASS = 'is-loading'
+  PAGE_TWO_CLASS = 'is-page-two'
+  ACTIVE_CLASS = 'is-active'
+  INDETERMINATE_CLASS = 'is-indeterminate'
   NON_SELECTABLE_CLASSES = '.divider, .separator, .dropdown-header, .dropdown-menu-empty-link'
   SELECTABLE_CLASSES = ".dropdown-content li:not(#{NON_SELECTABLE_CLASSES})"
   FILTER_INPUT = '.dropdown-input .dropdown-input-field'
@@ -154,37 +144,36 @@ class GitLabDropdown
   CURSOR_SELECT_SCROLL_PADDING = 5
 
   constructor: (@el, @options) ->
-    self = @
-    selector = $(@el).data "target"
+    self = this
+    selector = $(@el).data 'target'
     @dropdown = if selector? then $(selector) else $(@el).parent()
 
     # Set Defaults
     {
       # If no input is passed create a default one
-      @filterInput = @getElement(FILTER_INPUT)
+      @filterInput = @getElement FILTER_INPUT
       @highlight = false
       @filterInputBlur = true
     } = @options
 
-    self = @
+    self = this
 
     # If selector was passed
-    if _.isString(@filterInput)
-      @filterInput = @getElement(@filterInput)
+    @filterInput = @getElement(@filterInput) if _.isString @filterInput
 
     searchFields = if @options.search then @options.search.fields else []
 
     if @options.data
       # If we provided data
       # data could be an array of objects or a group of arrays
-      if _.isObject(@options.data) and not _.isFunction(@options.data)
+      if _.isObject(@options.data) and not _.isFunction @options.data
         @fullData = @options.data
         @parseData @options.data
       else
         # Remote data
-        @remote = new GitLabDropdownRemote @options.data, {
+        @remote = new GitLabDropdownRemote @options.data,
           dataType: @options.dataType,
-          beforeSend: @toggleLoading.bind(@)
+          beforeSend: @toggleLoading.bind this
           success: (data) =>
             @fullData = data
 
@@ -192,8 +181,8 @@ class GitLabDropdown
             currentIndex = -1
             @parseData @fullData
 
-            @filter.input.trigger('keyup') if @options.filterable and @filter and @filter.input
-        }
+            if @options.filterable and @filter and @filter.input
+              @filter.input.trigger 'keyup'
 
     # Init filterable
     if @options.filterable
@@ -210,9 +199,9 @@ class GitLabDropdown
           if @dropdown.find('.dropdown-toggle-page').length
             selector = ".dropdown-page-one #{selector}"
 
-          return $(selector)
+          $(selector)
         data: =>
-          return @fullData
+          @fullData
         callback: (data) =>
           @parseData data
 
@@ -232,36 +221,35 @@ class GitLabDropdown
 
     # Event listeners
 
-    @dropdown.on "shown.bs.dropdown", @opened
-    @dropdown.on "hidden.bs.dropdown", @hidden
-    $(@el).on "update.label", @updateLabel
-    @dropdown.on "click", ".dropdown-menu, .dropdown-menu-close", @shouldPropagate
+    @dropdown.on 'shown.bs.dropdown', @opened
+    @dropdown.on 'hidden.bs.dropdown', @hidden
+    $(@el).on 'update.label', @updateLabel
+    @dropdown.on 'click', '.dropdown-menu, .dropdown-menu-close', @shouldPropagate
     @dropdown.on 'keyup', (e) =>
-      if e.which is 27 # Escape key
-        $('.dropdown-menu-close', @dropdown).trigger 'click'
+      $('.dropdown-menu-close', @dropdown).trigger 'click' if e.which is 27
+
     @dropdown.on 'blur', 'a', (e) =>
       if e.relatedTarget?
         $relatedTarget = $(e.relatedTarget)
         $dropdownMenu = $relatedTarget.closest('.dropdown-menu')
 
-        if $dropdownMenu.length is 0
-          @dropdown.removeClass('open')
+        @dropdown.removeClass('open') if $dropdownMenu.length is 0
 
-    if @dropdown.find(".dropdown-toggle-page").length
-      @dropdown.find(".dropdown-toggle-page, .dropdown-menu-back").on "click", (e) =>
+    if @dropdown.find('.dropdown-toggle-page').length
+      @dropdown.find('.dropdown-toggle-page, .dropdown-menu-back').on 'click', (e) =>
         e.preventDefault()
         e.stopPropagation()
 
         @togglePage()
 
     if @options.selectable
-      selector = ".dropdown-content a"
+      selector = '.dropdown-content a'
 
-      if @dropdown.find(".dropdown-toggle-page").length
-        selector = ".dropdown-page-one .dropdown-content a"
+      if @dropdown.find('.dropdown-toggle-page').length
+        selector = '.dropdown-page-one .dropdown-content a'
 
-      @dropdown.on "click", selector, (e) ->
-        $el = $(@)
+      @dropdown.on 'click', selector, (e) ->
+        $el = $(this)
         selected = self.rowClicked $el
 
         if self.options.clicked
@@ -280,8 +268,7 @@ class GitLabDropdown
     menu = $('.dropdown-menu', @dropdown)
 
     if menu.hasClass(PAGE_TWO_CLASS)
-      if @remote
-        @remote.execute()
+      @remote.execute() if @remote
 
     menu.toggleClass PAGE_TWO_CLASS
 
@@ -316,38 +303,32 @@ class GitLabDropdown
 
   renderData: (data, group = false) ->
     data.map (obj, index) =>
-      return @renderItem(obj, group, index)
+      @renderItem(obj, group, index)
 
   shouldPropagate: (e) =>
-    if @options.multiSelect
-      $target = $(e.target)
-
-      if not $target.hasClass('dropdown-menu-close') and not $target.hasClass('dropdown-menu-close-icon') and not $target.data('is-link')
-        e.stopPropagation()
-        return false
-      else
-        return true
+    $target = $(e.target) if @options.multiSelect
+    unless $target.hasClass('dropdown-menu-close') and $target.hasClass('dropdown-menu-close-icon') and $target.data('is-link')
+      e.stopPropagation()
+      false
+    else
+      true
 
   opened: =>
     @resetRows()
     @addArrowKeyEvent()
 
-    if @options.setIndeterminateIds
-      @options.setIndeterminateIds.call(@)
+    @options.setIndeterminateIds.call this if @options.setIndeterminateIds
 
-    if @options.setActiveIds
-      @options.setActiveIds.call(@)
+    @options.setActiveIds.call this if @options.setActiveIds
 
     # Makes indeterminate items effective
     if @fullData and @dropdown.find('.dropdown-menu-toggle').hasClass('js-filter-bulk-update')
       @parseData @fullData
 
     contentHtml = $('.dropdown-content', @dropdown).html()
-    if @remote && contentHtml is ""
-      @remote.execute()
+    @remote.execute() if @remote and contentHtml is ''
 
-    if @options.filterable
-      @filterInput.focus()
+    @filterInput.focus() if @options.filterable
 
     @dropdown.trigger('shown.gl.dropdown')
 
@@ -355,71 +336,67 @@ class GitLabDropdown
     @resetRows()
     @removeArrayKeyEvent()
 
-    $input = @dropdown.find(".dropdown-input-field")
+    $input = @dropdown.find('.dropdown-input-field')
 
     if @options.filterable
       $input
         .blur()
-        .val("")
+        .val('')
 
     # Triggering 'keyup' will re-render the dropdown which is not always required
     # specially if we want to keep the state of the dropdown needed for bulk-assignment
-    if not @options.persistWhenHide
-      $input.trigger("keyup")
+    $input.trigger('keyup') unless @options.persistWhenHide
 
-    if @dropdown.find(".dropdown-toggle-page").length
+    if @dropdown.find('.dropdown-toggle-page').length
       $('.dropdown-menu', @dropdown).removeClass PAGE_TWO_CLASS
 
-    if @options.hidden
-      @options.hidden.call(@,e)
+    @options.hidden.call this, e if @options.hidden
 
     @dropdown.trigger('hidden.gl.dropdown')
 
 
   # Render the full menu
   renderMenu: (html) ->
-    menu_html = ""
+    menu_html = ''
 
     if @options.renderMenu
-      menu_html = @options.renderMenu(html)
+      menu_html = @options.renderMenu html
     else
-      menu_html = $('<ul />')
-        .append(html)
+      menu_html = $('<ul/>').append html
 
-    return menu_html
+    menu_html
 
   # Append the menu into the dropdown
   appendMenu: (html) ->
     selector = '.dropdown-content'
-    if @dropdown.find(".dropdown-toggle-page").length
-      selector = ".dropdown-page-one .dropdown-content"
+    if @dropdown.find('.dropdown-toggle-page').length
+      selector = '.dropdown-page-one .dropdown-content'
     $(selector, @dropdown)
       .empty()
-      .append(html)
+      .append html
 
   # Render the row
   renderItem: (data, group = false, index = false) ->
-    html = ""
+    html = ''
 
     # Divider
-    return "<li class='divider'></li>" if data is "divider"
+    return '<li class='divider'></li>' if data is 'divider'
 
     # Separator is a full-width divider
-    return "<li class='separator'></li>" if data is "separator"
+    return '<li class='separator'></li>' if data is 'separator'
 
     # Header
-    return _.template("<li class='dropdown-header'><%- header %></li>") header: data.header if data.header?
+    return _.template('<li class="dropdown-header"><%- header %></li>')({ header: data.header }) if data.header?
 
     if @options.renderRow
       # Call the render function
       html = @options.renderRow.call(@options, data, @)
     else
-      if not selected
+      unless selected
         value = if @options.id then @options.id(data) else data.id
         fieldName = @options.fieldName
         field = @dropdown.parent().find("input[name='#{fieldName}'][value='#{value}']")
-        if field.length
-          selected = true
+        selected = true if field.length
 
       # Set URL
       if @options.url?
@@ -433,10 +410,9 @@ class GitLabDropdown
       else
         text = if data.text? then data.text else ''
 
-      cssClass = ""
+      cssClass = ''
 
-      if selected
-        cssClass = "is-active"
+      cssClass = 'is-active' if selected
 
       if @highlight
         text = @highlightTextMatches(text, @filterInput.val())
@@ -445,18 +421,18 @@ class GitLabDropdown
         groupAttrs = "data-group=#{group} data-index=#{index}"
       else
         groupAttrs = ''
-      html = _.template("<li>
-        <a href='<%- url %>' <%- groupAttrs %> class='<%- cssClass %>'>
+      html = _.template('<li>
+        <a href="<%- url %>" <%- groupAttrs %> class="<%- cssClass %>">
           <%= text %>
         </a>
-      </li>")({
+      </li>')({
         url: url
         groupAttrs: groupAttrs
         cssClass: cssClass
         text: text
       })
 
-    return html
+    html
 
   highlightTextMatches: (text, term) ->
     occurrences = fuzzaldrinPlus.match(text, term)
@@ -465,20 +441,20 @@ class GitLabDropdown
     ).join('')
 
   noResults: ->
-    html = "<li class='dropdown-menu-empty-link'>
-      <a href='#' class='is-focused'>
+    html = '<li class="dropdown-menu-empty-link">
+      <a href="#" class="is-focused">
         No matching results.
       </a>
-    </li>"
+    </li>'
 
   rowClicked: (el) ->
     fieldName = @options.fieldName
     isInput = $(@el).is('input')
 
     if @renderedData
-      groupName = el.data('group')
+      groupName = el.data 'group'
       if groupName
-        selectedIndex = el.data('index')
+        selectedIndex = el.data 'index'
         selectedObject = @renderedData[groupName][selectedIndex]
       else
         selectedIndex = el.closest('li').index()
@@ -501,20 +477,19 @@ class GitLabDropdown
 
       # Toggle the dropdown label
       if @options.toggleLabel
-        @updateLabel(selectedObject, el, @)
+        @updateLabel(selectedObject, el, this)
       else
         selectedObject
     else if el.hasClass(INDETERMINATE_CLASS)
       el.addClass ACTIVE_CLASS
       el.removeClass INDETERMINATE_CLASS
 
-      if not value?
-        field.remove()
+      field.remove() unless value?
 
       if not field.length and fieldName
         @addInput(fieldName, value)
 
-      return selectedObject
+      selectedObject
     else
       if not @options.multiSelect or el.hasClass('dropdown-clear-active')
         @dropdown.find(".#{ACTIVE_CLASS}").removeClass ACTIVE_CLASS
@@ -522,24 +497,23 @@ class GitLabDropdown
         unless isInput
           @dropdown.parent().find("input[name='#{fieldName}']").remove()
 
-      if !value?
-        field.remove()
+      field.remove() unless value?
 
       # Toggle active class for the tick mark
       el.addClass ACTIVE_CLASS
 
       # Toggle the dropdown label
       if @options.toggleLabel
-        @updateLabel(selectedObject, el, @)
+        @updateLabel(selectedObject, el, this)
       if value?
-        if !field.length and fieldName
+        if not field.length and fieldName
           @addInput(fieldName, value)
         else
           field
             .val value
             .trigger 'change'
 
-      return selectedObject
+      selectedObject
 
   addInput: (fieldName, value)->
     # Create hidden input for form
@@ -556,7 +530,7 @@ class GitLabDropdown
     # Dropdown list item link selector, excluding non-selectable list items
     selector = "#{SELECTABLE_CLASSES}:eq(#{index}) a"
 
-    if @dropdown.find(".dropdown-toggle-page").length
+    if @dropdown.find('.dropdown-toggle-page').length
       selector = ".dropdown-page-one #{selector}"
 
     # simulate a click on the first link
@@ -570,11 +544,11 @@ class GitLabDropdown
 
   addArrowKeyEvent: ->
     ARROW_KEY_CODES = [38, 40]
-    $input = @dropdown.find(".dropdown-input-field")
+    $input = @dropdown.find '.dropdown-input-field'
 
     # Dropdown list item selector, excluding non-selectable list items
     selector = SELECTABLE_CLASSES
-    if @dropdown.find(".dropdown-toggle-page").length
+    if @dropdown.find('.dropdown-toggle-page').length
       selector = ".dropdown-page-one #{selector}"
 
     $('body').on 'keydown', (e) =>
@@ -597,12 +571,13 @@ class GitLabDropdown
           # Move up
           currentIndex -= 1 if currentIndex > 0
 
-        @highlightRowAtIndex($listItems, currentIndex) if currentIndex isnt PREV_INDEX
+        if currentIndex isnt PREV_INDEX
+          @highlightRowAtIndex($listItems, currentIndex)
 
         return false
 
       # If enter is pressed and a row is highlighted, select it
-      if currentKeyCode is 13 and currentIndex != -1
+      if currentKeyCode is 13 and currentIndex isnt -1
         e.preventDefault()
         e.stopImmediatePropagation()
         @selectRowAtIndex e, currentIndex
@@ -621,7 +596,7 @@ class GitLabDropdown
 
     # Update the class for the row at the specific index
     $listItem = $listItems.eq(index)
-    $listItem.find('a:first-child').addClass "is-focused"
+    $listItem.find('a:first-child').addClass 'is-focused'
 
     # Dropdown content scroll area
     $dropdownContent = $listItem.closest('.dropdown-content')
@@ -640,7 +615,7 @@ class GitLabDropdown
       $dropdownContent.scrollTop(0)
     else if index is $listItems.length - 1
       # If this is the last item in the list, scroll to the bottom
-      $dropdownContent.scrollTop($dropdownContent[0].scrollHeight)
+      $dropdownContent.scrollTop $dropdownContent.prop 'scrollHeight'
     else if listItemBottom > dropdownContentBottom + dropdownScrollTop
       # Scroll the dropdown content down with a little padding
       $dropdownContent.scrollTop(listItemBottom - dropdownContentBottom + CURSOR_SELECT_SCROLL_PADDING)
@@ -649,9 +624,9 @@ class GitLabDropdown
       $dropdownContent.scrollTop(listItemTop - dropdownContentTop - CURSOR_SELECT_SCROLL_PADDING)
 
   updateLabel: (selected = null, el = null, instance = null) =>
-    $(@el).find(".dropdown-toggle-text").text @options.toggleLabel(selected, el, instance)
+    $(@el).find('.dropdown-toggle-text').text @options.toggleLabel(selected, el, instance)
 
 $.fn.glDropdown = (opts) ->
-  return @.each ->
-    if (!$.data @, 'glDropdown')
-      $.data(@, 'glDropdown', new GitLabDropdown @, opts)
+  @each ->
+    unless $.data this, 'glDropdown'
+      $.data this, 'glDropdown', new GitLabDropdown this, opts