# Questions about Tk - Newbie **URL:** \ **Category:** Ruby\ **Created:** [March 31, 2006, 11:28pm UTC](https://www.ruby-forum.com/t/questions-about-tk-newbie/56540 "2006-03-31T23:28:48Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![braas](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/f04885/32.png) [@braas](https://www.ruby-forum.com/u/braas)\ **Post date:** [March 31, 2006, 11:28pm UTC](https://www.ruby-forum.com/t/questions-about-tk-newbie/56540/1 "2006-03-31T23:28:48Z")
Hey I’ve just started to learn my first GUI toolkit today. Tk 🙂 Well, I surfed around for some tutorials for a while but I only found one that looked good. Could you link me some good tutorials? I escpecially need some that gives examples on how a tk and ruby work together. My biggiest interest in tk right now, is how I store a string given by the user from an entry in a ruby variable. So if that is not in included in a tutorial, could someone please give me an example 🙂 Thanks in advande 🙂 ---
**Author:** ![braas](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/f04885/32.png) [@braas](https://www.ruby-forum.com/u/braas)\ **Post date:** [April 1, 2006, 3:05am UTC](https://www.ruby-forum.com/t/questions-about-tk-newbie/56540/2 "2006-04-01T03:05:04Z")
Okay, thanks. I have played a little around with it now, and I can get a TkText widget to display a variable. Neither through text or insert. How do you then do it? 2006/4/1, Chris A. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): ---
**Author:** ![braas](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/f04885/32.png) [@braas](https://www.ruby-forum.com/u/braas)\ **Post date:** [April 1, 2006, 1:52am UTC](https://www.ruby-forum.com/t/questions-about-tk-newbie/56540/3 "2006-04-01T01:52:14Z")
# This can be shortened at the expense of clarity. require ‘tk’ root = TkRoot.new v = TkVariable.new(‘Foo’) e = TkEntry.new(root,‘textvariable’=\>v) e.pack b = TkButton.new(root,‘text’=\>‘PrintFoo’,‘command’=\>proc {print v.value - “\n”}) b.pack Tk.mainloop ---
**Author:** ![braas](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/f04885/32.png) [@braas](https://www.ruby-forum.com/u/braas)\ **Post date:** [April 1, 2006, 6:22am UTC](https://www.ruby-forum.com/t/questions-about-tk-newbie/56540/4 "2006-04-01T06:22:16Z")
So TkText’s don’t have textvariable’s. They sore their own text (actually more than just text as it can contain widgets, colors, different fonts, etc.). Think of TkText and TkCanvas as being similar. Wheras TkText and TkEntry are not. require ‘tk’ root = TkRoot.new t = TkText.new(root) t.insert(‘end’,“Hi, here is some text!\n”) v = t.get(‘1.0’,‘end’) print v + “\n” ---
**Author:** ![braas](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/f04885/32.png) [@braas](https://www.ruby-forum.com/u/braas)\ **Post date:** [April 1, 2006, 4:00pm UTC](https://www.ruby-forum.com/t/questions-about-tk-newbie/56540/5 "2006-04-01T16:00:26Z")
Ok, but what is then common to do when you have a variable pointing to a string with 1-10 lines of text and you want the string displayed in an editable field? 2006/4/1, Chris A. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): ---
**Author:** ![braas](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/f04885/32.png) [@braas](https://www.ruby-forum.com/u/braas)\ **Post date:** [April 1, 2006, 5:08pm UTC](https://www.ruby-forum.com/t/questions-about-tk-newbie/56540/6 "2006-04-01T17:08:22Z")
From: “Jeppe J.” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) Subject: Re: Questions about Tk - Newbie Date: Sat, 1 Apr 2006 22:59:01 +0900 Message-ID: [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > Ok, but what is then common to do when you have a variable pointing to a > string with 1-10 lines of text and you want the string displayed in an > editable field? ## Hmm… I don’t know why you need such realtime reflection. I think you may have better solution for your problem. However, if you really need it, for example, requrie ‘tk’ v = TkVariable.new TkLabel.new(:textvariable=\>v, :relief=\>:ridge).pack TkButton.new(:text=\>‘add str’, :command=\>proc{v.value += ‘str’}).pack t = TkText.new.pack v.trace(‘w’, proc{t.value = v.value}) t.bind(‘KeyPress’, proc{v.value = t.value}) Tk.mainloop ---
**Author:** ![braas](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/f04885/32.png) [@braas](https://www.ruby-forum.com/u/braas)\ **Post date:** [April 1, 2006, 6:30pm UTC](https://www.ruby-forum.com/t/questions-about-tk-newbie/56540/7 "2006-04-01T18:30:59Z")
It’s for a sort of calculater that I’m writing (It’s supposed to make my math and physics exams less painful ), so I need to be able to edit some output, shown in the TkText field, before I process the output further. Thank very much you for the example, I think it was just what I needed to make it work 🙂 2006/4/1, Hidetoshi NAGAI [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):