feat(modal): exclude hidden elements from query

- Modify element query to exclude hidden elements

Closes #5512
Closes #5644

Author: wesleycho

src/modal/modal.js

@@ -259,10 +259,16 @@ angular.module('ui.bootstrap.modal', ['ui.bootstrap.stackedMap'])
       };
 
       //Modal focus behavior
-      var tababbleSelector = 'a[href], area[href], input:not([disabled]), ' +
+      var tabableSelector = 'a[href], area[href], input:not([disabled]), ' +
         'button:not([disabled]),select:not([disabled]), textarea:not([disabled]), ' +
         'iframe, object, embed, *[tabindex], *[contenteditable=true]';
 
+      function isVisible(element) {
+        return !!(element.offsetWidth ||
+          element.offsetHeight ||
+          element.getClientRects().length);
+      }
+
       function backdropIndex() {
         var topBackdropIndex = -1;
         var opened = openedWindows.keys();
@@ -565,7 +571,11 @@ angular.module('ui.bootstrap.modal', ['ui.bootstrap.stackedMap'])
         if (modalWindow) {
           var modalDomE1 = modalWindow.value.modalDomEl;
           if (modalDomE1 && modalDomE1.length) {
-            return modalDomE1[0].querySelectorAll(tababbleSelector);
+            var elements = modalDomE1[0].querySelectorAll(tabableSelector);
+            return elements ?
+              Array.prototype.filter.call(elements, function(element) {
+                return isVisible(element);
+              }) : elements;
           }
         }
       };

src/modal/test/modal.spec.js

@@ -761,6 +761,52 @@ describe('$uibModal', function() {
 
       initialPage.remove();
     });
+
+    it('should change focus to next non-hidden element when tab is pressed', function() {
+      var initialPage = angular.element('<a href="#" id="cannot-get-focus-from-modal">Outland link</a>');
+      angular.element(document.body).append(initialPage);
+      initialPage.focus();
+
+      open({
+        template:'<a href="#" id="tab-focus-link1">a</a><a href="#" id="tab-focus-link2">b</a><a href="#" id="tab-focus-link3">c</a>' +
+        '<button id="tab-focus-button">Open me!</button>',
+        keyboard: false
+      });
+      $rootScope.$digest();
+      expect($document).toHaveModalsOpen(1);
+
+      $('#tab-focus-link3').focus();
+      expect(document.activeElement.getAttribute('id')).toBe('tab-focus-link3');
+
+      $('#tab-focus-button').css('display', 'none');
+      triggerKeyDown(angular.element(document.activeElement), 9, false);
+      expect(document.activeElement.getAttribute('id')).toBe('tab-focus-link1');
+
+      initialPage.remove();
+    });
+
+    it('should change focus to previous non-hidden element when shift+tab is pressed', function() {
+      var initialPage = angular.element('<a href="#" id="cannot-get-focus-from-modal">Outland link</a>');
+      angular.element(document.body).append(initialPage);
+      initialPage.focus();
+
+      open({
+        template:'<a href="#" id="tab-focus-link1">a</a><a href="#" id="tab-focus-link2">b</a><a href="#" id="tab-focus-link3">c</a>' +
+        '<button id="tab-focus-button">Open me!</button>',
+        keyboard: false
+      });
+      $rootScope.$digest();
+      expect($document).toHaveModalsOpen(1);
+
+      $('#tab-focus-link1').focus();
+      expect(document.activeElement.getAttribute('id')).toBe('tab-focus-link1');
+
+      $('#tab-focus-button').css('display', 'none');
+      triggerKeyDown(angular.element(document.activeElement), 9, true);
+      expect(document.activeElement.getAttribute('id')).toBe('tab-focus-link3');
+
+      initialPage.remove();
+    });
   });
 
   describe('default options can be changed in a provider', function() {