I believe that you need to pass a reference to a (Update: Scalar) variable into the -textvariable parameter for an entry widget.

use Tk;
require Tk::Entry;
require Tk::Button;

my $mw = MainWindow->new();

my($var1, $var2) = ('val1', 'val2');

my $entry1 = $mw->Entry(-textvariable=> \$var1)->pack();

my $entry2 = $mw->Entry(-textvariable => $var2)->pack();

my $but = $mw->Button(-text=>'print', -command=> sub{print "$var1, $va
+r2\n"; } )->pack();

MainLoop;

__END__
# Output upon pressing print after changeing both entry widget's:

entry1, val2

[download]

Update: Please note that I intentioally left off the backslash on $val2 to demonstrate the different behavior when passing a simple value rather than a scalar reference.

They say that time changes things, but you actually have to change them yourself.

—Andy Warhol

In reply to Re: Tk -textvariable doesn't change when Entry widget changes by JediWizard
in thread Tk -textvariable doesn't change when Entry widget changes by Petras

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.