Beefy Boxes and Bandwidth Generously Provided by pair Networks
more useful options
 
PerlMonks  

Re: perltk: error getting values from dynamically generated combo boxes

by SuicideJunkie (Priest)
on May 07, 2012 at 20:05 UTC ( #969323=note: print w/ replies, xml ) Need Help??


in reply to perltk: error getting values from dynamically generated combo boxes

Tk::Error: bad listbox index "": must be active, anchor, end, @x,y, or a number at /usr/intel/pkgs/perl/5.8.5/lib/site_perl/5.8.5/x86_64-linux/Tk.pm line 247

So. You're giving a listbox index that is either an empty string or perhaps undef. The solution is to not do that :)

Try printing out the values you're using, and then see where the bad value is coming from.

You could also make a temporary tweak to Tk.pm, and have it confess instead.


Comment on Re: perltk: error getting values from dynamically generated combo boxes
Select or Download Code
Re^2: perltk: error getting values from dynamically generated combo boxes
by ruhroh (Initiate) on May 07, 2012 at 21:30 UTC

    The problem is that:

    $field_id = $listb$listb_index -> curselection();

    only returns a value if it is retrieving a value from the last listbox created. Otherwise, it will return a value "". I have been looking at the documentation for listbox from: http://search.cpan.org/~srezic/Tk-804.030/pod/Listbox.pod . But I don't know why my script can't retrieve the values from the first created listbox.

    UPDATE: I did a check to see if the previous listboxes existed by just doing a get(0). They all print out dog as expected.

    So the problem is why doesn't curselection not work on the old listboxes and only the most recently "added" listbox?

      I tried to look back where your $listb is coming from. (needs a better name BTW - I've no idea what it is for) and it got confusing pretty quick.

      I suggest regenerating your indentation with perltidy, and taking a closer look at @content and the repeated ties. I'm not familiar with tie, but I'd guess that you're making a giant knot out of all your gui elements there.

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://969323]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others romping around the Monastery: (5)
As of 2015-07-05 09:04 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 (61 votes), past polls