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Use Summary data for field validation

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  • Use Summary data for field validation

    How do I use the Total in a grid to do validation?

    I have a table that tracks a users vacation days used. Each entry in the table contains a start date, end date and calculated length.

    When a user wants to request another day, I would like to be able to take the total already used and add that to the total requested to either allow or deny the vacation request.

    ie: totalused + vacationrequest < vacationentitlement

    I am having trouble figuring out how to gain access to that summary variable in my code. I have this:

    if + datasubmitted.length > VacationEntitlement
    result.cancel = .t.
    result.errorhtml = "You cannot add more vacation days, you've exceeded your alotment of " + VacationEntitlement + " days for this year."
    end if

    This is obviously not working. I've tried, and that also doesn't seem to be working. My field name is Length in the grid.

    Would appreciate if someone could shed some light on this for me. Thank you.

  • #2
    Re: Use Summary data for field validation

    The Total does not exist until you submit the record(s), by which time the user will have saved their vacation request dispite your attempt to deny.

    Maybe a better way is the shopping cart method (my term). Instead of making your grid against the real table, make it against a 'cart' table. When the user clicks whatever link to request vacation, assign them a hidden 'cart id' value using a UUID. As they save their vacation to this cart table, include that cart_id to distinguish this guys request from all others. Filter the grid by this value so only records from this vacation request appear as he saves records. Each time the user saves their vacation request (which I guess may be one or more rows), get the total of the cart plus the total in their official record table. Do this with code on the A5W page, not in the Grid.

    This code on the A5W page would show what their remaining balance is at any moment. Each time they submit a record(s), the value will change. If they go over, say so on the A5W page.

    Now here is the rest of the trick. You don't have to prohibit anything on the grid, they can go five weeks over their vacation, you don't care, its just the Vacation Cart, not the official record. You now add a DIALOG to this same page that says "I'm happy with my vacation selection, please submit." It has just the Submit button and maybe an Are You Sure dropdown and an Abandon option.

    The Dialog's Validate Event looks at the official record, plus what is in the cart and decides if the request is valid. If so, the schedule is set, if not, you report back that they must change their request until it is valid.

    If they process the vacation, use the cart to feed your official record, and purge the cart. If they abandon, purge the cart. Over time, you will end up with a bunch of records in the cart if the person just closed their browser, so you need a routine to purge those every so often.
    Steve Wood
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