refactor(macAutocomplete): Reduced parsing when update items

src/directives/autocomplete.coffee

@@ -87,8 +87,10 @@ angular.module("Mac").directive "macAutocomplete", [
     require:     "ngModel"
 
     link: ($scope, element, attrs, ctrl, transclude) ->
-      labelKey = attrs.macAutocompleteLabel  or "name"
-      queryKey = attrs.macAutocompleteQuery  or "q"
+      labelKey    = attrs.macAutocompleteLabel or "name"
+      labelGetter = $parse labelKey
+
+      queryKey = attrs.macAutocompleteQuery or "q"
       delay    = +(attrs.macAutocompleteDelay or 800)
       inside   = attrs.macAutocompleteInside?
 
@@ -133,8 +135,10 @@ angular.module("Mac").directive "macAutocomplete", [
             timeoutId = $timeout ->
               queryData value
             , delay
-          else
+
+          else if isMenuAppended
             queryData value
+
         else
           reset()
 
@@ -224,15 +228,15 @@ angular.module("Mac").directive "macAutocomplete", [
       @param {Array} data Array of data
       ###
       updateItem = (data = []) ->
+        $menuScope.items.length = 0
+
         if data.length > 0
           currentAutocomplete = data
 
           $menuScope.items = data.map (item) ->
             if angular.isObject item
-              itemGetter = $parse labelKey
-
-              item.value ?= itemGetter(item) or ""
-              item.label ?= itemGetter(item) or ""
+              item.value ?= labelGetter(item) or ""
+              item.label ?= labelGetter(item) or ""
               item
 
             else