Tk – Selection Widgets
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Selection widgets are used to select different options in a Tk application. The list of available selection widgets are as shown below.
| Sr.No. | Widgets & Description |
|---|---|
| 1 | Radiobutton
Widget that has a set of on/off buttons and labels, one of which may be selected. |
| 2 | Checkbutton
Widget that has a set of on/off buttons and labels, many of which may be selected. |
| 3 | Menu
Widget that acts as holder for menu items. |
| 4 | Listbox
Widget that displays a list of cells, one or more of which may be selected. |
A simple Tk example is shown below using selection widgets −
#!/usr/bin/wish
grid [frame .gender ]
grid [label .label1 -text "Male" -textvariable myLabel1 ]
grid [radiobutton .gender.maleBtn -text "Male" -variable gender -value "Male"
-command "set myLabel1 Male"] -row 1 -column 2
grid [radiobutton .gender.femaleBtn -text "Female" -variable gender -value "Female"
-command "set myLabel1 Female"] -row 1 -column 3
.gender.maleBtn select
grid [label .myLabel2 -text "Range 1 not selected" -textvariable myLabelValue2 ]
grid [checkbutton .chk1 -text "Range 1" -variable occupied1 -command {if {$occupied1 } {
set myLabelValue2 {Range 1 selected}
} else {
set myLabelValue2 {Range 1 not selected}
} }]
proc setLabel {text} {
.label configure -text $text
}
When we run the above program, we will get the following output −
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