fix(datepicker): add check for contains

Closes angular-ui#4423
Fixes angular-ui#4411

# Conflicts:
#	src/datepicker/datepicker.js

Cherry picked commit from original repository: angular-ui@868c0e2?diff=split

src/datepicker/datepicker.js

@@ -210,10 +210,8 @@ angular.module('ui.bootstrap.datepicker', ['ui.bootstrap.dateparser', 'ui.bootst
         return; // do nothing
       }
       $scope.select(self.activeDate);
-      focusElement();
     } else if (evt.ctrlKey && (key === 'up' || key === 'down')) {
       $scope.toggleMode(key === 'up' ? 1 : -1);
-      focusElement();
     } else {
       self.handleKeyDown(key, evt);
       self.refreshView();
@@ -595,7 +593,7 @@ function($compile, $parse, $document, $rootScope, $position, dateFilter, datePar
           delete options.initDate;
         }
         angular.forEach(options, function(value, option) {
-          datepickerEl.attr( cameltoDash(option), value );
+          datepickerEl.attr(cameltoDash(option), value);
         });
       }
 
@@ -715,7 +713,12 @@ function($compile, $parse, $document, $rootScope, $position, dateFilter, datePar
       });
 
       var documentClickBind = function(event) {
-        if (scope.isOpen && !(element[0].contains(event.target) || popupEl[0].contains(event.target))) {
+        var popup = $popup[0];
+        var dpContainsTarget = element[0].contains(event.target);
+        // The popup node may not be an element node
+        // In some browsers (IE) only element nodes have the 'contains' function
+        var popupContainsTarget = popup.contains !== undefined && popup.contains(event.target);
+        if (scope.isOpen && !(dpContainsTarget || popupContainsTarget)) {
           scope.$apply(function() {
             scope.isOpen = false;
           });