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Modulus 11 self-check digit validation - newby question

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    Modulus 11 self-check digit validation - newby question

    I need to incorporate a validation check for a 10 digit ID - called NSN (stands for National Student Number). The specification is a fairly straight forward modulus 11 self-check - and it goes like this:

    The NSN must be a valid NSN, i.e. it must satisfy the following:
    � the NSN is a 10 digit number, leading zeros are not normally displayed
    � the right-most (least significant) digit of the NSN is its check-digit.
    � each of the other nine digits (the base number) is multiplied by a weight (the weight per digit position is fixed).
    Digits position: 9 8 7 6 5 4 3 2 1
    Weight: 31 29 23 19 17 13 7 5 3
    � The (digit * weight) results are summed for all the digits of the base number.
    � The sum modulus 11 is calculated.
    � This value should match the check digit, note that numbers with the remainder 10 will be invalid.

    I want Alpha to do this check before saving a record in a conventional grid compionent. My questions are two:

    1. having no idea about xbasic, I therefore have no idea about how to code the above
    2. I'm also not sure about where it goes in the grid component.

    I'm sure someone must have done this validation check before and might be able to offer me some code and an idea about where to put it.

    I'm still using V11.

    Any help very much appreciated.


    Re: Modulus 11 self-check digit validation - newby question

    Here is a simple xbasic function to check the number and append the check digit to the end. It returns the number with the check digit if the base number is valid and ERROR if not. This could be used in serve side validation. if you need client side you would need a javascript function.

    To test import the function into the code tab and in the interactive window type:

    vcweight = "31 29 23 19 17 13 7 5 3"
    vcnum = "123456789" '"7979399" and "79793999" are both invalid numbers to test

    with an enter after each line

    get_mod_11 - 12-28-2014 -1.txt


      Re: Modulus 11 self-check digit validation - newby question

      Fantastic Allen, much appreciated. I'll try the server-side first and see how it goes. Regards, Malcolm