Add keyup event for model changed
it's enough use ng-change directive  if alpha or number characters is input,
but Non-English speaking country character need to check keyup event for last character input

reference : https://code.angularjs.org/1.2.27/docs/api/ng/type/ngModel.NgModelController
check this out :  Listen for change events element.on('blur keyup change', function() { ...