---
name: "ttk::checkbutton"
section: "3tk"
platform: "linux"
package: "tk8.5-doc"
version: "8.5.19-1"
release: "Debian 9 (Stretch)"
platforms: ["linux"]
url: "https://new.carta.tech/ttk::checkbutton"
---

# ttk::checkbutton(3tk)

On/off widget

```

```

## NAME

ttk::checkbutton - On/off widget

## SYNOPSIS

**ttk::checkbutton** *pathName* ?*options*?

```

```

## DESCRIPTION

A **ttk::checkbutton** widget is used to show or change a setting. It has two states, selected and deselected.   The state of the checkbutton may be linked to a Tcl variable.

## STANDARD OPTIONS

```
-class	-compound	-cursor
-image	-state	-style
-takefocus	-text	-textvariable
-underline	-width
```

See the  manual entry for details on the standard options.

## WIDGET-SPECIFIC OPTIONS

```
Command-Line Name:	-command
Database Name:	command
Database Class:	Command
```

-

  A Tcl script to execute whenever the widget is invoked.

```
Command-Line Name:	-offvalue
Database Name:	offValue
Database Class:	OffValue
```

-

  The value to store in the associated **-variable**  when the widget is deselected.  Defaults to **0**.

```
Command-Line Name:	-onvalue
Database Name:	onValue
Database Class:	OnValue
```

-

  The value to store in the associated **-variable**  when the widget is selected.  Defaults to **1**.

```
Command-Line Name:	-variable
Database Name:	variable
Database Class:	Variable
```

-

  The name of a global variable whose value is linked to the widget. Defaults to the widget pathname if not specified.

## WIDGET COMMAND

In addition to the standard  **cget**, **configure**, **identify**, **instate**, and **state**  commands, checkbuttons support the following additional widget commands:

- *pathname* **invoke**

  Toggles between the selected and deselected states and evaluates the associated **-command**. If the widget is currently selected, sets the **-variable** to the **-offvalue** and deselects the widget; otherwise, sets the **-variable** to the **-onvalue** Returns the result of the **-command**.

## WIDGET STATES

The widget does not respond to user input if the **disabled** state is set. The widget sets the **selected** state whenever  the linked **-variable** is set to the widget's **-onvalue**, and clears it otherwise. The widget sets the **alternate** state whenever the  linked **-variable** is unset.   (The **alternate** state may be used to indicate a “tri-state” or “indeterminate” selection.)

## STANDARD STYLES

**Ttk::checkbutton** widgets support the **Toolbutton** style in all standard themes, which is useful for creating widgets for toolbars.

## SEE ALSO

[ttk::widget(3tk)](/ttk::widget/3tk.md), [ttk::radiobutton(3tk)](/ttk::radiobutton/3tk.md), [checkbutton(3tk)](/checkbutton/3tk.md)

## KEYWORDS

widget, button, toggle, check, option