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Re^4: Tk vs Tkx for -validatecommand

by shortyfw06 (Beadle)
on Sep 19, 2012 at 19:40 UTC ( #994507=note: print w/ replies, xml ) Need Help??


in reply to Re^3: Tk vs Tkx for -validatecommand
in thread Tk vs Tkx for -validatecommand

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?


Comment on Re^4: Tk vs Tkx for -validatecommand
Re^5: Tk vs Tkx for -validatecommand
by Anonymous Monk on Sep 19, 2012 at 20:00 UTC

    :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__

        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.

        Well, fixing g_pack so you have $ent is not the only change you made

        If you employ basic debugging checklist, I'm sure you'll notice what isn't getting called and when

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