Controller

If your Visualforce page contains a canvas app, you can use methods in the Controller object to publish an event that the canvas app subscribes to. It contains these methods:

Method	Signature	Description
`publish`	`publish(String name, Object payload [, String[] target])`	Used to publish an event that the canvas app subscribes to. The `target` parameter is optional. It can contain a single canvas app name or an array of canvas app names.
`resize`	`resize(String height, String width, String target)`	Used by a Visualforce page to resize a canvas app iFrame.
`subscribe`	`subscribe(Subscriber event)`	Used by a Visualforce page to subscribe to events that the canvas app might publish.
`unsubscribe`	`unsubscribe(Unsubscriber event)`	Used by a Visualforce page to unsubscribe to parent events that the canvas app might publish.

See Also

Using Events between a Visualforce Page and a Canvas App
SignedRequest