in reply to perl/Tk Entry validation

Would you have any advice to make it work?

Yes, show a complete example which demonstrates the problem. It look off the top of my head, that you may have a problem in the return value from -validatecommand .... it should return a 1 or 0. Look how this works. 

#!/usr/bin/perl
use strict;
use warnings;
use Tk;


my $top = MainWindow->new();
$top->geometry('200x200');

my %entries;

for(1..4){
 $entries{$_}{'value'} ||= 0;
 $entries{$_}{'entry'} = $top->Entry(
     -textvariable => \$entries{$_}{'value'},
     -width        => 5,
     -bg           => 'white',   
     -validate     => 'key',
     -vcmd         => \&validate,
  )->pack;
}

MainLoop;

#have to make sure empty value has numeric context
sub validate{
  my $val = shift;
  $val ||= 0;
  #get alphas and punctuation out
  if( $val !~ /^\d+$/ ){ return 0 }
  if (($val >= 0) and ($val <= 100)) {return 1}
    else{ return 0 }
}

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Re^2: perl/Tk Entry validation
by contact@solamen.fr (Novice) on Jul 24, 2012 at 12:43 UTC
    Sorry for this lack of courtesy. Posting the complete example is indeed a good practice. I'll stick to it. Based on your example I tried the following code to add the boundaries as arguments of the validate subroutine. I cannot figure out how to reference the input value in the -validatecommand. I have tried $_, $_[0] and $xVConsSflEmbMax but none seems to work... 
    use strict;
use Tk;

my $xVConsSflEmbMax0 = 1.0;
my $xVConsSflEmbMax = $xVConsSflEmbMax0;

my $mw = new MainWindow();
my $entry = $mw->Entry(
  -textvariable     => \$xVConsSflEmbMax,
  -width            => 3,
  -validate         => 'focusout',
  -validatecommand  => [\&validSub,$_[0],0,1],
  -invalidcommand   => sub {$xVConsSflEmbMax=$xVConsSflEmbMax0},
) -> pack;

MainLoop;

sub validSub {
  my ($val,$min,$max) = @_;
  $val ||= 0;
  $min ||= -1E10;
  $max ||= 1E10;
  if( $val !~ /^\d*\.?\d+$/ ) { return 0 }
  elsif (($val >= $min) and ($val <= $max)) {return 1}
  else { return 0 }
}

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[d/l]
      As you might have noticed in the documentation or in the example above, you do not have to send any arguments to validatecommand. They are sent automatically.
[reply]
        Actually the question is not really if it is NECESSARY to pass some arguments to the validate command but if it is POSSIBLE - just as it is done in the case of any other command using a subroutine reference with arguments in a list. Remember I want to set the boundaries as parameters of the validation process.
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