Our app will have to figure out which button was hit and handle the data and output as needed. In C::A, there is really only one place you can put this logic: cgiapp_prerun(). If you have many runmodes that need this sort of functionalilty, your cgiapp_prerun() can start getting rather large.

Why would you not have the runmode method handle this?

I tend to use the runmode more as a vague indidactor of the expected action anyway - it determines the kind of checks that need to be done on the input, then decides which action to perform, and then refers to an output routine. Example:

sub make_report {
    my $self = shift;
    if (my $missing = $self->missing_fields()) {
        # back to submitted form, with missing fields highlighted
        return $self->make_form($missing); 
    }
    # make confirmation screen.
    $self->template(
        'confirm.tmpl' =>
            $self->form_values,
    );
}
[download]

This decides the output based on wether or not all data has been filled in correctly, but it isn't really very different if you check for a button instead.

update: after reading this thread again, it seems most some people find it hard to wrap their head around the following:

runmode != page != template

A runmode is just a hint from the calling form about what the input data is about, and what the application should to with it. It does not describe what template should be shown.

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