Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl: the Markov chain saw
 
PerlMonks  

Re^3: Tk vs Tkx for -validatecommand

by Anonymous Monk
on Sep 19, 2012 at 18:42 UTC ( #994497=note: print w/ replies, xml ) Need Help??


in reply to Re^2: Tk vs Tkx for -validatecommand
in thread Tk vs Tkx for -validatecommand

:) You're still stuck in your Tk.pm-isms

If you run your program you'll get a nice error

Can't call method "configure" without a package or object reference

g_pack doesn't return an object


Comment on Re^3: Tk vs Tkx for -validatecommand
Download Code
Replies are listed 'Best First'.
Re^4: Tk vs Tkx for -validatecommand
by shortyfw06 (Beadle) on Sep 19, 2012 at 19:40 UTC

    Yes, I'm having such a hard time with this... I got the error but it points to line 10 which doesn't have a g_pack command? I don't understand what the problem is. Does this mean the g_pack for the entry didn't work?

      :D:D:D:D:D:D:D:D:D

      http://docs.activestate.com/activetcl/8.5/tcl/TkCmd/pack.htm

      You're calling configure on $ent but $ent is not an object

      $ent is assigned the return value from g_pack

      g_pack doesn't return an object

      the return value of the g_pack method is not an object

      g_pack returned something which is not an object

      g_pack returned the empty string ""

      "" the empty string does not have a configure method

      "" the empty string is not an object

      you can't call methods on the empty string ""

      :D:D:D:D:D:D:D:D:D

        Thank you Anonymous Monk. I fixed the script but the validatecommand is still not doing what I expect. I want it to give an immediate error if an invalid character is input into the entry.

        #! perl use strict; use warnings; use Tkx; my $value; my $mw = Tkx::widget->new("."); my $frame = $mw -> new_frame(); $frame->g_pack(); my $ent = $frame ->new_entry(-textvariable => \$value); $ent->g_pack(); $ent->configure(-validatecommand => [sub { $_[0] =~ /^(?:|-|\d+|-\d+)$ +/ }, Tkx::Ev('%P'), $ent], -invalidcommand => \&lam_num_error); my $print_button = $mw->new_button(-text => "Print", -command => \&printx, -font => "ansi 10 bold")->g_pack(); my $reset_frm = $mw->new_frame(); $reset_frm->g_pack(-fill => 'both'); my $reset_button = $reset_frm->new_button(-text => "Reset", -command => \&do_reset, -font => "ansi 10 bold")->g_p +ack(); Tkx::MainLoop(); sub printx { print $value unless $value eq '-'; } sub do_reset { $ent->delete(0, 'end'); } sub lam_num_error { Tkx::tk___mmessageBox(-message => "The input must be an integer.") +; } __END__

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://994497]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others imbibing at the Monastery: (7)
As of 2015-07-08 06:27 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (94 votes), past polls