[dancer-users] Retrieving params of fields with multiple values

Maxwell Carey mcarey at ucar.edu
Thu Aug 21 19:30:31 BST 2014

You can coerce everything into an arrayref like this (requires 5.10+):

    my $foo = param 'foo';
    $foo = [ $foo // () ] if ref $foo ne 'ARRAY';
    for (@$foo) { ... }

$foo is now an arrayref with 0, 1, or more elements. You're still checking
for undef and arrayref, so this is just a convenient shortcut.

On Thu, Aug 21, 2014 at 3:55 AM, Andrew Beverley <andy at andybev.com> wrote:

> Hi guys,
> I may be missing something here, so I wanted to run this by you:
> When a form is submitted that has multiple fields with the same name
> (such as several checkboxes), the values of that field are all returned
> in an array ref.
> However, if the same form is submitted, but only one value is returned
> (eg. only one checkbox has been ticked) then a scalar is returned. If no
> checkboxes are ticked, then undef is returned.
> This makes it difficult to process a form with several checkboxes, as
> the return value from param('checkbox') can be an array ref, scalar or
> undef, depending how many checkboxes are ticked.
> At the moment, I'm testing for each of those 3 conditions. Is there a
> better way?
> It would be useful if param() could be called in array context, in which
> case it would return 0, 1 or several items, depending on which ones were
> checked.
> Thanks,
> Andy
> _______________________________________________
> dancer-users mailing list
> dancer-users at dancer.pm
> http://lists.preshweb.co.uk/mailman/listinfo/dancer-users
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