0 
#Variables:
set var1 123
set var2 456
set var3 789

#Widgets:
label .label1 -text ""
listbox .lstb1 -height 3 -width 20 -selectmode browse
.lstb1 insert 0 Var1 Var2 Var3

#Procedure
proc SelectionHappened {listbox label} {
set activeItem [$listbox get active]
$label configure -text $$activeItem
}

#Interface
bind .lstb1 <<ListboxSelect>> {SelectionHappened .lstb1 .label1}
grid .label1 .lstb1 -sticky news

How to get in .label1 value of the selected variable, not the variable name ?

ie: instead of "$ Var1" get "123"; instead of "$ Var2" get "456"; instead of "$ Var3" get "789"

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2 Answers 2

Reset to default
2

You need to change this:

.lstb1 insert 0 Var1 Var2 Var3

to this:

.lstb1 insert 0 $var1 $var2 $var3

and this:

set activeItem [$listbox get active]

to this:

set activeItem [$listbox get [$listbox curselection]]

and finally this:

$label configure -text $$activeItem

to this:

$label configure -text $activeItem

(Why doesn't $listbox get active work? When you select an item in the listbox, $listbox get active gives you the item that was active before you clicked. If you select the same item twice, $listbox get active will point out that item the second time.)

Update in response to comment:

Leave this line

.lstb1 insert 0 Var1 Var2 Var3

as is, and change this line:

set activeItem [$listbox get active]

to

set activeItem [lindex {123 456 789} [$listbox curselection]]

or

set values {123 456 789}
set activeItem [lindex $values [$listbox curselection]]

Documentation: label, lindex, listbox, set

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2 Comments

Thank you! Yes, it works. But I would like that in listbox all lines were displayed in the form of names of variables as before.
Yeah! Its works! That's what I wanted! Thank you very much, Peter !!
0

How about using the label widget's -textvariable option?

proc SelectionHappened {listbox label} {
    set varName [$listbox get [$listbox curselection]]
    $label configure -textvariable $varName
}
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1 Comment

The list item text isn't the same as the variable name. I don't know if that's a dealbreaker.

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