# Command

#### new Cesium.Command()
Widgets/Command.js 18

A Command is a function with an extra `canExecute` observable property to determine whether the command can be executed. When executed, a Command function will check the value of `canExecute` and throw if false. This type describes an interface and is not intended to be instantiated directly. See `createCommand` to create a command from a function.

### Members

#### afterExecute : Event
Widgets/Command.js 42

Gets an event which is raised after the command executes, the event is raised with the return value of the command as its only parameter.

Default Value: `undefined`

#### beforeExecute : Event
Widgets/Command.js 34

Gets an event which is raised before the command executes, the event is raised with an object containing two properties: a `cancel` property, which if set to false by the listener will prevent the command from being executed, and an `args` property, which is the array of arguments being passed to the command.

Default Value: `undefined`

#### canExecute : Boolean
Widgets/Command.js 24

Gets whether this command can currently be executed. This property is observable.

Default Value: `undefined`