Greetings Monks;
The title isn't terribly descriptive, and I couldn't think of anything better in such a short space... At any rate, this issue:

I'm working on a set of CGIs which read in a number of vars from a FORM submit. I have a list of vars which cannot be empty, so after I read in all the var's using ->param(), I have something like this: 

if ($var eq "" || $var2 eq "" || $var3 eq ""} { &complain(); }

[download]
Now I've been told that this list of non-empty fields can change depending on the whim of the customer. Therefore I need to have a better, less hard-coded, way of checking the vars. The list of vars that must be non-empty will be imported from DBI, since everything is database based anyway.
My problem is trying to work out a tidy way of actually taking this list of fields and comparing it to the bunch of scalars I have. I could make a hash, and have some kind of routine to check over the hash, ala: 
my $var1 = $cgi->param('var1');
my $var2 = $cgi->param('var2');
my $var3 = $cgi->param('var3');

my $h = { 'var1' => $var1, 'var2' => $var2, 'var3' => $var3 };
my @list = qw(var1 var3);

foreach (@list) { if (!exists $$h{$_}) { &complain; } }

[download]
But that is somewhat untidy, as you can see.
How would you do the above?

My thanks,
JP,
-- Alexander Widdlemouse undid his bellybutton and his bum dropped off --

In reply to Validating the contents of scalars using an array based list by JPaul

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