Getting index from listbox

[lakshmivaragan]

Hi,
Is there any inbuilt function to get the index when the text is given ?(Text items are unique)

(At present I'm getting index by my own proc. )

Thanx
Lakshmivaragan

 

[ulis]

Not directly.
The simpler is to set the -listvariable option and lsearch your text inside the list:
listbox .l -listvariable ::mylist
.l insert 0 one two three
proc find {text} { lsearch $::mylist $text }
puts [find two]
-->1

HTH

ulis

 

[AviaTraining]

I agree with ulis that the easiest way to do this is with an associated -listvariable. But if you're using a version of Tcl before the introduction of -listvariable (Tcl/Tk 8.3.0), you can instead retrieve the contents of the listbox with the get operation and then do the search.

[tt]% [ignore]pack [listbox .l][/ignore]
% .l insert 0 First Second Third Fourth Fifth
% .l get 0 end
First Second Third Fourth Fifth
% [ignore]lsearch [.l get 0 end] "Third"[/ignore]
2[/tt]

But even in this situation (pre-8.3), if I were needing to do a "reverse-lookup" of listbox entries frequently, I'd create a "shadow variable" of the listbox contents rather than constantly executing the get operation.

- Ken Jones, President, ken@avia-training.com
Avia Training and Consulting,

http://www.avia-training.com

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