variable with istboxselect

[RJHoldi]

hi ng,

i try to get a variable in bonding with listboxselect. i got a list shown in entry1 and the result schould be shown in entry2. i get an eror that the there is no such variable xyz. here is the code:

set list1 {1 2 3 4 5 6 7 8 9}
set list2 {a b c d e f g h i}

listbox .listbox
set list1_lenght [llength $list1]
for {set i 0} {$i <= $list1_lenght} {incr i} {
.listbox insert end [lindex $list1 $i]
}


entry .result -width 16 -relief sunken -textvariable result
pack .listbox .result
bind .listbox <<ListboxSelect>> {set xyz [selection get]} # here the variable xyv is set
set index [lsearch $list1 $xyz] # here the error occurs
set result [lindex $list2 $index]


why is the variable xyz not set ?
regards Reinhold

 

[Bong]

Right off the bat, there's a really cool shortcut to get a list associated with a listbox. Use the -listvariable option:
listbox .listbox -listvariable list1
By the way, it's probably considered bad form to name a listbox, "listbox".
So, now you won't need:
for {set i 0} {$i <= $list1_lenght} {incr i} {
.listbox insert end [lindex $list1 $i]
}

Now, selection get is really [red].listbox[/red] selection get, only there is no ... selection get. What you want, I think, is .listbox curselection.

So I would do it this way:

set list1 {1 2 3 4 5 6 7 8 9}
set list2 {a b c d e f g h i}

listbox .listbox [red]-listvariable list1[/red]
entry .result -width 16 -relief sunken -textvariable result
pack .listbox .result
bind .listbox <<ListboxSelect>> {set xyz [.listbox curselection]}  # here the variable xyv is set
set result [lindex $list2 $xyz]

_________________
Bob Rashkin

 

[RJHoldi]

hi bob,
thanks for your answer. the hints with listvariable and curselection are super. but the variable xyz still is not set.
regards Reinhold

 

[Bong]

It seems to work for me. In a WISH session I did this:

% set list1 {a b c d e}
a b c d e
() 2 % pack [listbox .lb -listvariable list1]
() 3 % bind .lb <<ListboxSelect>> {set ix [.lb curselection]}
() 4 % set ix
3
() 5 %

between lines 3 and 4, I selected "d" in the listbox, and indeed, "ix" was set to "3".

_________________
Bob Rashkin

 

[RJHoldi]

hi bob,
you are right. i tried to run it from a script and so the var is not set. i just have to bind the "set ix" to an event and that it should be.

thanks for help and i really need an other book,
regards Reinhold