Phone Number component validate input

phone-number-validateInput.js

{
  ...
  scope.validateInput = function validateInput(fieldId) {

      var phone = scope.phone;

      // Validate input for US/CA Form
      if (/US|CA/.test(scope.countryCode)) {

          // If all the model values have values, 
          // then update the parent model
          if (phone.areaCode && phone.areaCode && 
              phone.phoneOne && phone.phoneTwo) {

              scope.parentModel = phone.countryCode +
                                  phone.areaCode +
                                  phone.phoneOne +
                                  phone.phoneTwo;
          }
          // Otherwise the parent model should be emptied because 
          // the inputs are invalid
          else {
              scope.parentModel = "";
          }

      }
      // Validate input for International Form
      else {
          // If the internal model holds a value, 
          // then update the parent model
          if (phone.international) {
              scope.parentModel = phone.international;
          }
          // Otherwise the parent model should be emptied
          else {
              scope.parentModel = "";
          }
      }

      ...

  }
  ...
}