javascript - ngStorage not storing data when being updated -

i building directive handles out courses, part of saving course data in local storage user can resume.

when data changes call function

function setlocalstorage(){     if(!preview){         $localstorage.scorm = scope.scorm     } } 

i call when first load course

my problem data not updated in local storage.

when debug can see $localstorage.scorm getting updated in chrome console data in actual local storage unchanged.

solved using $apply

function setlocalstorage(){     if(!preview){         scope.$apply(function () {             $localstorage.scorm = scope.scorm;         });     } }