The docs for validation are not very clear in
Tk::Entry, but the -validatecommand callback is designed to accept a return of 1, 0, or -1 from the callback.
You may squeeze some other functionality out of it, but I wouldn't count on it working the way you expect. Here is how I might do it.
#!/usr/bin/perl
use warnings;
use strict;
use Tk;
my $mw = MainWindow->new;
my %ents;
for( my $i=0;$i<=5;$i++)
{
$ents{$i} = $mw->Entry( -bg => 'white',
)->pack();
$ents{$i}->bind('<Return>', \&display );
}
MainLoop;
sub display {
foreach my $ent (sort keys %ents ){
print $ents{$ent}->get(),"\n";
}
print "\n\n";
}
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