fix(typeahead): close dropdown on tab with no selection

- When no item is selected and tab is hit, close the dropdown

Closes #3340

src/typeahead/test/typeahead.spec.js

@@ -863,7 +863,7 @@ describe('typeahead tests', function () {
     });
   });
 
-  it('should not capture enter or tab until an item is focused', function () {
+  it('should not capture enter or tab when an item is not focused', function () {
     $scope.select_count = 0;
     $scope.onSelect = function ($item, $model, $label) {
       $scope.select_count = $scope.select_count + 1;
@@ -876,10 +876,20 @@ describe('typeahead tests', function () {
     expect($scope.keyDownEvent.isDefaultPrevented()).toBeFalsy();
     expect($scope.select_count).toEqual(0);
 
-    // tab key should not be captured when nothing is focused
+    // tab key should close the dropdown when nothing is focused
     triggerKeyDown(element, 9);
     expect($scope.keyDownEvent.isDefaultPrevented()).toBeFalsy();
     expect($scope.select_count).toEqual(0);
+    expect(element).toBeClosed();
+  });
+
+  it('should capture enter or tab when an item is focused', function () {
+    $scope.select_count = 0;
+    $scope.onSelect = function ($item, $model, $label) {
+      $scope.select_count = $scope.select_count + 1;
+    };
+    var element = prepareInputEl('<div><input ng-model="result" ng-keydown="keyDownEvent = $event" typeahead="item for item in source | filter:$viewValue" typeahead-on-select="onSelect($item, $model, $label)" typeahead-focus-first="false"></div>');
+    changeInputValueTo(element, 'b');
 
     // down key should be captured and focus first element
     triggerKeyDown(element, 40);

src/typeahead/typeahead.js

@@ -332,7 +332,14 @@ angular.module('ui.bootstrap.typeahead', ['ui.bootstrap.position', 'ui.bootstrap
         }
 
         // if there's nothing selected (i.e. focusFirst) and enter is hit, don't do anything
-        if (scope.activeIdx == -1 && (evt.which === 13 || evt.which === 9)) {
+        if (scope.activeIdx === -1 && evt.which === 13) {
+          return;
+        }
+
+        // if there's nothing selected (i.e. focusFirst) and tab is hit, clear the results
+        if (scope.activeIdx === -1 && evt.which === 9) {
+          resetMatches();
+          scope.$digest();
           return;
         }