Tk - Check Button Widget

Tk check button is used to create multiple selectable items in the form of check boxes. The syntax for check button widget is shown below −

checkbutton checkbuttonName options

Options

The options available for the check button widget are listed below in the following table −

Sr.No.	Syntax & Description
1	-font fontDescriptor Used to set font for widget.
2	-height number Used to set height for widget.
3	-command action Sets the command action for button.
4	-text text Sets the text for widget.
5	-width number Sets the width for widget.
6	-variable variableName Sets the variable for widget.

A simple Tk example for check button is shown below −

#!/usr/bin/wish

grid [label .myLabel1  -text "Range 20-30 not selected" -textvariable myLabelValue1 ] 
grid [checkbutton .chk1 -text "Range 20-30" -variable occupied1 -command {if {$occupied1 } {
   set myLabelValue1 {Range 20-30 selected}
} else {
   set myLabelValue1 {Range 20-30 not selected}
} }]
grid [label .myLabel2  -text "Range 30+ not selected" -textvariable myLabelValue2 ] 
grid [checkbutton .chk2 -text "Range 20-30" -variable occupied2 -command {if {$occupied2 } {
   set myLabelValue2 {Range 30+ selected}
} else {
   set myLabelValue2 {Range 30+ not selected}
} }]

When we run the above program, we will get the following output −

When we click the check button1 and check button2, we will get the following output −

tk_selection_widgets.htm