feat(ngAria): Adds button role to ng-click

Closes #9254

Author: Marcy Sutton

docs/content/guide/accessibility.ngdoc

@@ -213,11 +213,13 @@ The default CSS for `ngHide`, the inverse method to `ngShow`, makes ngAria redun
 If `ng-click` or `ng-dblclick` is encountered, ngAria will add `tabindex="0"` if it isn't there
 already.
 
-For `ng-click`, keypress will also be bound to `div` and `li` elements. You can turn this
-functionality on or off with the `bindKeypress` configuration option.
+To fix widespread accessibility problems with `ng-click` on div elements, ngAria will dynamically
+bind keypress by default as long as the element isn't an anchor, button, input or textarea.
+You can turn this functionality on or off with the `bindKeypress` configuration option. ngAria
+will also add the `button` role to communicate to users of assistive technologies.
 
-For `ng-dblclick`, you must manually add `ng-keypress` to non-interactive elements such as `div`
-or `taco-button` to enable keyboard access.
+For `ng-dblclick`, you must still manually add `ng-keypress` and role to non-interactive elements such
+as `div` or `taco-button` to enable keyboard access.
 
 <h3>Example</h3>
 ```html

src/ngAria/aria.js

@@ -22,13 +22,13 @@
  *
  * | Directive                                   | Supported Attributes                                                                   |
  * |---------------------------------------------|----------------------------------------------------------------------------------------|
- * | {@link ng.directive:ngModel ngModel}        | aria-checked, aria-valuemin, aria-valuemax, aria-valuenow, aria-invalid, aria-required |
  * | {@link ng.directive:ngDisabled ngDisabled}  | aria-disabled                                                                          |
  * | {@link ng.directive:ngShow ngShow}          | aria-hidden                                                                            |
  * | {@link ng.directive:ngHide ngHide}          | aria-hidden                                                                            |
- * | {@link ng.directive:ngClick ngClick}        | tabindex, keypress event                                                               |
  * | {@link ng.directive:ngDblclick ngDblclick}  | tabindex                                                                               |
  * | {@link module:ngMessages ngMessages}        | aria-live                                                                              |
+ * | {@link ng.directive:ngModel ngModel}        | aria-checked, aria-valuemin, aria-valuemax, aria-valuenow, aria-invalid, aria-required, input roles |
+ * | {@link ng.directive:ngClick ngClick}        | tabindex, keypress event, button role                                                               |
  *
  * Find out more information about each directive by reading the
  * {@link guide/accessibility ngAria Developer Guide}.
@@ -315,17 +315,22 @@ ngAriaModule.directive('ngShow', ['$aria', function($aria) {
       var fn = $parse(attr.ngClick, /* interceptorFn */ null, /* expensiveChecks */ true);
       return function(scope, elem, attr) {
 
+        var nodeBlackList = ['BUTTON', 'A', 'INPUT', 'TEXTAREA'];
+
         function isNodeOneOf(elem, nodeTypeArray) {
           if (nodeTypeArray.indexOf(elem[0].nodeName) !== -1) {
             return true;
           }
         }
+        if (!elem.attr('role') && !isNodeOneOf(elem, nodeBlackList)) {
+          elem.attr('role', 'button');
+        }
 
         if ($aria.config('tabindex') && !elem.attr('tabindex')) {
           elem.attr('tabindex', 0);
         }
 
-        if ($aria.config('bindKeypress') && !attr.ngKeypress && isNodeOneOf(elem, ['DIV', 'LI'])) {
+        if ($aria.config('bindKeypress') && !attr.ngKeypress && !isNodeOneOf(elem, nodeBlackList)) {
           elem.on('keypress', function(event) {
             if (event.keyCode === 32 || event.keyCode === 13) {
               scope.$apply(callback);