some refactoring

app/assets/javascripts/issues.js.coffee

@@ -3,6 +3,7 @@
     Issues.initTemplates()
     Issues.initSearch()
     Issues.initChecks()
+    Issues.toggleLabelFilters()
 
     $("body").on "ajax:success", ".close_issue, .reopen_issue", ->
       t = $(this)
@@ -20,11 +21,20 @@
     Issue.labelRow = _.template(
       '<% _.each(labels, function(label){ %>
         <span class="label-row">
-          <a href="#"><span class="label color-label" style="background-color: <%= label.color %>; color: #FFFFFF" title="<%= label.description %>" data-container="body"><%= label.title %></span></a>
+          <a href="#"><span class="label color-label has-tooltip" style="background-color: <%= label.color %>; color: #FFFFFF" title="<%= label.description %>" data-container="body"><%= label.title %></span></a>
         </span>
       <% }); %>'
     )
 
+  toggleLabelFilters: ()->
+    $filteredLabels = $('.filtered-labels')
+    if $filteredLabels.find('.label-row').length > 0
+      #$filteredLabels.show()
+      $filteredLabels.slideDown().css({'overflow':'visible'})
+    else
+      #$filteredLabels.hide()
+      $filteredLabels.slideUp().css({'overflow':'visible'})
+
   reload: ->
     Issues.initChecks()
     $('#filter_issue_search').val($('#issue_search').val())
@@ -43,13 +53,15 @@
     paramKeys = ['author_id', 'milestone_title', 'assignee_id', 'issue_search']
 
     for paramKey in paramKeys
-      newParams[paramKey] = gl.utils.getUrlParameter(paramKey) or ''
+      newParams[paramKey] = gl.utils.getParameterValues(paramKey)[0] or ''
 
     if stateFilters.length
       stateFilters.find('a').each ->
         initialUrl = gl.utils.removeParamQueryString($(this).attr('href'), 'label_name[]')
-        if gl.utils.getParamQueryString('label_name[]')
-          newUrl = "#{gl.utils.mergeUrlParams(newParams, initialUrl)}&#{gl.utils.getParamQueryString('label_name[]')}"
+        labelNameValues = gl.utils.getParameterValues('label_name[]')
+        if labelNameValues
+          labelNameQueryString = ("label_name[]=#{value}" for value in labelNameValues).join('&')
+          newUrl = "#{gl.utils.mergeUrlParams(newParams, initialUrl)}&#{labelNameQueryString}"
         else
           newUrl = gl.utils.mergeUrlParams(newParams, initialUrl)
         $(this).attr 'href', newUrl
@@ -84,29 +96,24 @@
         Issues.reload()
         Issues.updateStateFilters()
         $filteredLabels = $('.filtered-labels')
-        $filteredLabelsSpans = $filteredLabels.find('span')
+        $filteredLabelsSpans = $filteredLabels.find('.label-row')
         gl.animate.animateEach(
-          $filteredLabelsSpans,
-          'fadeOutDown', 20, {
-            cssStart: {
+          $filteredLabelsSpans, 'fadeOutDown', 20,
+            cssStart:
               opacity: 1
-            },
-            cssEnd: {
+            cssEnd:
               opacity: 0
-            }
-        }).then( ->
+        ).then( ->
           if typeof Issue.labelRow is 'function'
             $filteredLabels.html(Issue.labelRow(data))
-          $spans = $filteredLabels.find('span')
-          $spans.css('opacity',0)
-          return gl.animate.animateEach($spans, 'fadeInUp', 20, {
-            cssStart: {
+          Issues.toggleLabelFilters()
+          $spans = $filteredLabels.find('.label-row')
+          $spans.css('opacity', 0)
+          return gl.animate.animateEach $spans, 'fadeInUp', 20,
+            cssStart:
               opacity: 0
-            },
-            cssEnd: {
+            cssEnd:
               opacity: 1
-            }
-          })
         )
 
       dataType: "json"

app/assets/javascripts/labels_select.js.coffee

@@ -224,7 +224,7 @@ class @LabelsSelect
           selected_labels = $('.js-label-select').siblings('.dropdown-menu-labels').find('.is-active')
 
           if selected and selected.title?
-            if selected_labels and selected_labels.length > 1
+            if selected_labels.length > 1
               "#{selected.title} +#{selected_labels.length - 1} more"
             else
               selected.title
@@ -247,7 +247,7 @@ class @LabelsSelect
         hidden: ->
           page = $('body').data 'page'
           isIssueIndex = page is 'projects:issues:index'
-          isMRIndex = page is page is 'projects:merge_requests:index'
+          isMRIndex = page is 'projects:merge_requests:index'
 
           $selectbox.hide()
           # display:block overrides the hide-collapse rule
@@ -256,11 +256,8 @@ class @LabelsSelect
             if $dropdown.hasClass('js-filter-submit') and (isIssueIndex or isMRIndex)
               selectedLabels = $dropdown
                 .closest('form')
-                .find("input[type='hidden'][name='#{$dropdown.data('fieldName')}']")
-              Issues.filterResults(
-                $dropdown.closest('form'),
-                $dropdown.data('fieldName')
-              )
+                .find("input:hidden[name='#{$dropdown.data('fieldName')}']")
+              Issues.filterResults $dropdown.closest('form')
             else if $dropdown.hasClass('js-filter-submit')
               $dropdown.closest('form').submit()
             else
@@ -270,7 +267,7 @@ class @LabelsSelect
         clicked: (label) ->
           page = $('body').data 'page'
           isIssueIndex = page is 'projects:issues:index'
-          isMRIndex = page is page is 'projects:merge_requests:index'
+          isMRIndex = page is 'projects:merge_requests:index'
           if $dropdown.hasClass('js-filter-submit') and (isIssueIndex or isMRIndex)
             if not $dropdown.hasClass 'js-multiselect'
               selectedLabel = label.title

app/assets/javascripts/lib/url_utility.js.coffee

@@ -3,16 +3,20 @@
   w.gl ?= {}
   w.gl.utils ?= {}
 
-  w.gl.utils.getUrlParameter = (sParam) ->
+  # Returns an array containing the value(s) of the
+  # of the key passed as an argument
+  w.gl.utils.getParameterValues = (sParam) ->
     sPageURL = decodeURIComponent(window.location.search.substring(1))
     sURLVariables = sPageURL.split('&')
     sParameterName = undefined
+    values = []
     i = 0
     while i < sURLVariables.length
       sParameterName = sURLVariables[i].split('=')
       if sParameterName[0] is sParam
-        return if sParameterName[1] is undefined then true else sParameterName[1]
+        values.push(sParameterName[1])
       i++
+    values
 
   # #
   #  @param {Object} params - url keys and value to merge
@@ -28,14 +32,6 @@
         newUrl = "#{newUrl}#{(if newUrl.indexOf('?') > 0 then '&' else '?')}#{paramName}=#{paramValue}"
     newUrl
 
-  # get parameter query string from url.
-  w.gl.utils.getParamQueryString = (param) ->
-    pageURL = decodeURIComponent(window.location.search.substring(1))
-    urlVariables = pageURL.split('&')
-    (
-      variables for variables in urlVariables when variables.indexOf(param) > -1
-    ).join('&')
-
   # removes parameter query string from url. returns the modified url
   w.gl.utils.removeParamQueryString = (url, param) ->
     url = decodeURIComponent(url)

app/assets/javascripts/merge_requests.js.coffee

@@ -3,6 +3,7 @@
 #
 @MergeRequests =
   init: ->
+    $('.filtered-labels').hide()
     MergeRequests.initSearch()
 
   # Make sure we trigger ajax request only after user stop typing

app/helpers/issuables_helper.rb

@@ -18,22 +18,20 @@ module IssuablesHelper
 
   def multi_label_name(current_labels, default_label)
     # current_labels may be a string from before
-    if current_labels.respond_to?('any?')
-      if current_labels.any?
-        if current_labels.count > 1
-          "#{current_labels[0]} +#{current_labels.count - 1} more"
-        else
-          current_labels[0]
-        end
+    if current_labels.is_a?(Array)
+      if current_labels.count > 1
+        "#{current_labels[0]} +#{current_labels.count - 1} more"
       else
-        default_label
+        current_labels[0]
       end
-    else
+    elsif current_labels.is_a?(String)
       if current_labels.nil? || current_labels.empty?
         default_label
       else
         current_labels
       end
+    else
+      default_label
     end
   end
 

app/views/shared/_labels_row.html.haml

-- labels.each do |l|
+- labels.each do |label|
   %span.label-row
-    = link_to_label(l, tooltip: false)
+    = link_to_label(label, tooltip: false)
\ No newline at end of file