validate-ssn validates the format of both Norwegian and Swedish social security numbers using MOD11 and MOD10 algorithms respectively. They check if the date input is valid and that the control-numbers sum is correct.

1. Create your SSN input field and add events.

Swedish ssn:

• Button | onChange | RUN clientside javascript | testSwedFnr($(this));
• Button | onBlur | RUN clientside javascript | testSwedFnr($(this));

Norwegian ssn:

• Button | onChange | RUN clientside javascript | validateSocialSecurityNumberNo($(this));
• Button | onBlur | RUN clientside javascript | validateSocialSecurityNumberNo($(this));

2. Add hidden input-field 'valid-ssn'

• Create input field. Remove label and set to hidden.
• Set expression value to 'false' and update value to render.
• 'Use only when field is empty' toggled on.

3. Add validation to SSN input

• Validation schematron ASSERT | valid-ssn = 'true'

NOTE: Hidden input and name in validation expression must be the same.

Norwegian ssn script:

1. Event sends the input element to the function validateSocialSecurityNumberNo
2. Function checks input length matches that of the input field maxlength
3. If valid checks the control numbers
4. Runs a MOD11 algorithm on the last ssn-number https://no.wikipedia.org/wiki/MOD11
5. Returns true or false to the hidden input field

Swedish ssn script:

1. Takes following formats:

• ååmmddxxxx
• ååmmdd-xxxx
• ååååmmddxxxx
• ååååmmdd-xxxx

2. Checks input length
3. Validates control-numbers checksum using MOD10 algorithm https://no.wikipedia.org/wiki/MOD10
4. Returns true or false to hidden input field

You can also install testssn on the server and connect it to a Digiforms template using a datasource:

• http://localhost/digiforms/util/testssn.jsp?ssn={$ssn}

It will then return true if the ssn is valid.