fix(datepicker): update with alternative format

Closes #5014

Author: davious

Diff for: src/datepicker/datepicker.js

@@ -679,7 +679,7 @@ function(scope, element, attrs, $compile, $parse, $document, $rootScope, $positi
 
     // Detect changes in the view from the text box
     ngModel.$viewChangeListeners.push(function() {
-      scope.date = dateParser.parse(ngModel.$viewValue, dateFormat, scope.date);
+      scope.date = parseDateString(ngModel.$viewValue);
     });
 
     element.bind('keydown', inputKeydownBind);
@@ -797,6 +797,19 @@ function(scope, element, attrs, $compile, $parse, $document, $rootScope, $positi
     return string.replace(/([A-Z])/g, function($1) { return '-' + $1.toLowerCase(); });
   }
 
+  function parseDateString(viewValue) {
+    var date = dateParser.parse(viewValue, dateFormat, scope.date);
+    if (isNaN(date)) {
+      for (var i = 0; i < altInputFormats.length; i++) {
+        date = dateParser.parse(viewValue, altInputFormats[i], scope.date);
+        if (!isNaN(date)) {
+          return date;
+        }
+      }
+    }
+    return date;
+  }
+
   function parseDate(viewValue) {
     if (angular.isNumber(viewValue)) {
       // presumably timestamp to date object
@@ -812,15 +825,7 @@ function(scope, element, attrs, $compile, $parse, $document, $rootScope, $positi
     }
 
     if (angular.isString(viewValue)) {
-      var date = dateParser.parse(viewValue, dateFormat, scope.date);
-      if (isNaN(date)) {
-        for (var i = 0; i < altInputFormats.length; i++) {
-          date = dateParser.parse(viewValue, altInputFormats[i], scope.date);
-          if (!isNaN(date)) {
-            break;
-          }
-        }
-      }
+      var date = parseDateString(viewValue);
       if (isNaN(date)) {
         return undefined;
       }
@@ -851,16 +856,7 @@ function(scope, element, attrs, $compile, $parse, $document, $rootScope, $positi
     }
 
     if (angular.isString(value)) {
-      var date = dateParser.parse(value, dateFormat);
-      if (isNaN(date)) {
-        for (var i = 0; i < altInputFormats.length; i++) {
-          date = dateParser.parse(value, altInputFormats[i]);
-          if (!isNaN(date)) {
-            break;
-          }
-        }
-      }
-      return !isNaN(date);
+      return !isNaN(parseDateString(viewValue));
     }
 
     return false;

Diff for: src/datepicker/test/datepicker.spec.js

@@ -2343,10 +2343,10 @@ describe('datepicker', function() {
         describe('datepickerPopupConfig.altInputFormats', function() {
           var originalConfig = {};
           beforeEach(inject(function(uibDatepickerPopupConfig) {
+            $rootScope.date = new Date('November 9, 1980');
             angular.extend(originalConfig, uibDatepickerPopupConfig);
             uibDatepickerPopupConfig.datepickerPopup = 'MM-dd-yyyy';
             uibDatepickerPopupConfig.altInputFormats = ['M!/d!/yyyy'];
-
             var wrapElement = $compile('<div><input ng-model="date" uib-datepicker-popup is-open="true"></div>')($rootScope);
             $rootScope.$digest();
             assignElements(wrapElement);
@@ -2364,6 +2364,12 @@ describe('datepicker', function() {
             expect($rootScope.date.getMonth()).toEqual(10);
             expect($rootScope.date.getDate()).toEqual(8);
           });
+
+          it('changes the datepicker', function() {
+            expect(selectedElementIndex()).toEqual(14);
+            changeInputValueTo(inputEl, '11/8/1980');
+            expect(selectedElementIndex()).toEqual(13);
+          });
         });
 
         describe('attribute `alt-input-formats`', function() {
@@ -2381,6 +2387,12 @@ describe('datepicker', function() {
             expect($rootScope.date.getMonth()).toEqual(10);
             expect($rootScope.date.getDate()).toEqual(8);
           });
+
+          it('changes the datepicker', function() {
+            expect(selectedElementIndex()).toEqual(14);
+            changeInputValueTo(inputEl, '11/8/1980');
+            expect(selectedElementIndex()).toEqual(13);
+          });
         });
       });