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Re^2: Entry Widget - validatecommand

by shortyfw06 (Beadle)
on Jul 23, 2012 at 16:58 UTC ( #983205=note: print w/ replies, xml ) Need Help??


in reply to Re: Entry Widget - validatecommand
in thread Entry Widget - validatecommand

Thank you. I've tried this code and it is allowing inputs other than numbers (positive or negative). I'd like to limit the entry options to only positive or negative integers.


Comment on Re^2: Entry Widget - validatecommand
Re^3: Entry Widget - validatecommand
by Athanasius (Monsignor) on Jul 24, 2012 at 02:23 UTC
    this code ... is allowing inputs other than numbers

    Not so! For the record, here is the exact code I am running (using Strawberry perl v5.16.0 built for MSWin32-x86-multi-thread-64int, running under Windows Vista 32-bit, and with Tk 804.030):

    #! perl use strict; use warnings; use Tk; my $value; my $mw = new MainWindow; my $ent = $mw->Entry(-textvariable => \$value, -validate => 'key', -validatecommand => sub { $_[0] =~ /^(?:|-|\d+|-\ +d+)$/ }, -invalidcommand => \&lam_num_error)->pack(); my $print_button = $mw->Button(-text => "Print", -command => \&printx, -font => "ansi 10 bold")->pack(); my $reset_frm = $mw->Frame(); $reset_frm->pack(-fill => 'both'); my $reset_button = $reset_frm->Button(-text => "Reset", -command => \&do_reset, -font => "ansi 10 bold")->pac +k(); MainLoop; sub printx { print $value unless $value eq '-'; } sub do_reset { $ent->delete(0, 'end'); } sub lam_num_error { $mw->messageBox(-message => "The input must be an integer."); } __END__

    This lets me enter -42, 763, etc., but if I try to enter a letter, or a punctuation symbol, or a minus sign anywhere after the first character, or even a space, I immediately get the message “The input must be an integer.” and my input never makes it into the Entry box. In other words, the code is working exactly as required.

    Athanasius <°(((><contra mundum

      I apologize Athanasius. It does do exactly what you say. Thank you very much for being so helpful! :-)

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