feat(typeahead): support typeahead-on-select callback

Closes #433

src/typeahead/test/typeahead.spec.js

@@ -369,6 +369,29 @@ describe('typeahead tests', function () {
         expect(inputEl.val()).toEqual('baz');
       });
 
+      it('should invoke select callback on select', function () {
+
+        $scope.states = [
+          {code: 'AL', name: 'Alaska'},
+          {code: 'CL', name: 'California'}
+        ];
+        $scope.onSelect = function ($item, $model, $label) {
+          $scope.$item = $item;
+          $scope.$model = $model;
+          $scope.$label = $label;
+        };
+        var element = prepareInputEl("<div><input ng-model='result' typeahead-on-select='onSelect($item, $model, $label)' typeahead='state.code as state.name for state in states | filter:$viewValue'></div>");
+        var inputEl = findInput(element);
+
+        changeInputValueTo(element, 'Alas');
+        triggerKeyDown(element, 13);
+
+        expect($scope.result).toEqual('AL');
+        expect($scope.$item).toEqual($scope.states[0]);
+        expect($scope.$model).toEqual('AL');
+        expect($scope.$label).toEqual('Alaska');
+      });
+
       it('should correctly update inputs value on mapping where label is not derived from the model', function () {
 
         $scope.states = [{code: 'AL', name: 'Alaska'}, {code: 'CL', name: 'California'}];

src/typeahead/typeahead.js

@@ -50,6 +50,8 @@ angular.module('ui.bootstrap.typeahead', ['ui.bootstrap.position'])
 
       var isLoadingSetter = $parse(attrs.typeaheadLoading).assign || angular.noop;
 
+      var onSelectCallback = $parse(attrs.typeaheadOnSelect);
+
       //pop-up element used to display matches
       var popUpEl = angular.element(
         "<typeahead-popup " +
@@ -144,10 +146,18 @@ angular.module('ui.bootstrap.typeahead', ['ui.bootstrap.position'])
       scope.select = function (activeIdx) {
         //called from within the $digest() cycle
         var locals = {};
-        locals[parserResult.itemName] = selected = scope.matches[activeIdx].model;
+        var model, item;
+        locals[parserResult.itemName] = item = selected = scope.matches[activeIdx].model;
 
-        modelCtrl.$setViewValue(parserResult.modelMapper(scope, locals));
+        model = parserResult.modelMapper(scope, locals);
+        modelCtrl.$setViewValue(model);
         modelCtrl.$render();
+
+        onSelectCallback(scope, {
+          $item: item,
+          $model: model,
+          $label: parserResult.viewMapper(scope, locals)
+        });
       };
 
       //bind keyboard events: arrows up(38) / down(40), enter(13) and tab(9), esc(27)