feat(core): Accessibility and keyboard support to the filter controls.

The filter controls can now be accessed using the tab keys and the
remove filter button automatically moves the focus to the input when it
is disabled.
They also support OSX Voice over reading.
Additionally all of the google accessibility audit rules pass.
The focus input now provides a default aria label on the input that can
be overridden in the filter settings.

src/js/core/directives/ui-grid-filter.js

@@ -1,7 +1,7 @@
 (function(){
   'use strict';
 
-  angular.module('ui.grid').directive('uiGridFilter', ['$compile', '$templateCache', function ($compile, $templateCache) {
+  angular.module('ui.grid').directive('uiGridFilter', ['$compile', '$templateCache', 'i18nService', 'gridUtil', function ($compile, $templateCache, i18nService, gridUtil) {
 
     return {
       compile: function() {
@@ -11,14 +11,22 @@
               $elm.children().remove();
               if ( filterable ){
                 var template = $scope.col.filterHeaderTemplate;
-    
+
                 $elm.append($compile(template)($scope));
               }
             };
-            
+
             $scope.$on( '$destroy', function() {
               delete $scope.col.updateFilters;
             });
+          },
+          post: function ($scope, $elm, $attrs, controllers){
+            $scope.aria = i18nService.getSafeText('headerCell.aria');
+            $scope.removeFilter = function(colFilter, index){
+              colFilter.term = null;
+              //Set the focus to the filter input after the action disables the button
+              gridUtil.focus.bySelector($elm, '.ui-grid-filter-input-' + index);
+            };
           }
         };
       }

src/js/core/directives/ui-grid-menu.js

@@ -16,7 +16,7 @@
  var app = angular.module('app', ['ui.grid']);
 
  app.controller('MainCtrl', ['$scope', function ($scope) {
-   
+
  }]);
  </script>
 
@@ -30,7 +30,7 @@
  */
 angular.module('ui.grid')
 
-.directive('uiGridMenu', ['$compile', '$timeout', '$window', '$document', 'gridUtil', 'uiGridConstants', 
+.directive('uiGridMenu', ['$compile', '$timeout', '$window', '$document', 'gridUtil', 'uiGridConstants',
 function ($compile, $timeout, $window, $document, gridUtil, uiGridConstants) {
   var uiGridMenu = {
     priority: 0,
@@ -46,7 +46,7 @@ function ($compile, $timeout, $window, $document, gridUtil, uiGridConstants) {
       var self = this;
       var menuMid;
       var $animate;
-     
+
     // *** Show/Hide functions ******
       self.showMenu = $scope.showMenu = function(event, args) {
         if ( !$scope.shown ){
@@ -57,11 +57,11 @@ function ($compile, $timeout, $window, $document, gridUtil, uiGridConstants) {
            * animate removal of the ng-if, as the menu items aren't there yet.  And we don't want
            * to rely on ng-show only, as that leaves elements in the DOM that are needlessly evaluated
            * on scroll events.
-           * 
+           *
            * Note when testing animation that animations don't run on the tutorials.  When debugging it looks
            * like they do, but angular has a default $animate provider that is just a stub, and that's what's
-           * being called.  ALso don't be fooled by the fact that your browser has actually loaded the 
-           * angular-translate.js, it's not using it.  You need to test animations in an external application. 
+           * being called.  ALso don't be fooled by the fact that your browser has actually loaded the
+           * angular-translate.js, it's not using it.  You need to test animations in an external application.
            */
           $scope.shown = true;
 
@@ -96,7 +96,7 @@ function ($compile, $timeout, $window, $document, gridUtil, uiGridConstants) {
            * In order to animate cleanly we animate the addition of ng-hide, then use a $timeout to
            * set the ng-if (shown = false) after the animation runs.  In theory we can cascade off the
            * callback on the addClass method, but it is very unreliable with unit tests for no discernable reason.
-           *   
+           *
            * The user may have clicked on the menu again whilst
            * we're waiting, so we check that the mid isn't shown before applying the ng-if.
            */
@@ -120,7 +120,7 @@ function ($compile, $timeout, $window, $document, gridUtil, uiGridConstants) {
         $scope.showMenu(event, args);
       });
 
-      
+
     // *** Auto hide when click elsewhere ******
       var applyHideMenu = function(){
         if ($scope.shown) {
@@ -129,7 +129,7 @@ function ($compile, $timeout, $window, $document, gridUtil, uiGridConstants) {
           });
         }
       };
-    
+
       if (typeof($scope.autoHide) === 'undefined' || $scope.autoHide === undefined) {
         $scope.autoHide = true;
       }
@@ -141,7 +141,7 @@ function ($compile, $timeout, $window, $document, gridUtil, uiGridConstants) {
       $scope.$on('$destroy', function () {
         angular.element(document).off('click touchstart', applyHideMenu);
       });
-      
+
 
       $scope.$on('$destroy', function() {
         angular.element($window).off('resize', applyHideMenu);
@@ -153,8 +153,8 @@ function ($compile, $timeout, $window, $document, gridUtil, uiGridConstants) {
 
       $scope.$on('$destroy', $scope.$on(uiGridConstants.events.ITEM_DRAGGING, applyHideMenu ));
     },
-    
-    
+
+
     controller: ['$scope', '$element', '$attrs', function ($scope, $element, $attrs) {
       var self = this;
     }]
@@ -184,12 +184,12 @@ function ($compile, $timeout, $window, $document, gridUtil, uiGridConstants) {
         pre: function ($scope, $elm, $attrs, controllers) {
           var uiGridCtrl = controllers[0],
               uiGridMenuCtrl = controllers[1];
-          
+
           if ($scope.templateUrl) {
             gridUtil.getTemplate($scope.templateUrl)
                 .then(function (contents) {
                   var template = angular.element(contents);
-                    
+
                   var newElm = $compile(template)($scope);
                   $elm.replaceWith(newElm);
                 });
@@ -253,4 +253,4 @@ function ($compile, $timeout, $window, $document, gridUtil, uiGridConstants) {
   return uiGridMenuItem;
 }]);
 
-})();
+})();