Canvas Developer Guide

Getting Started
Using Force.com Canvas
Force.com Canvas SDK
Canvas Apps and Visualforce Pages
Visualforce Page Code Examples
Visualforce Considerations
apex:canvasApp Component
Using Events between a Visualforce Page and a Canvas App
Publishing a Canvas Event from a Visualforce Page
Resizing a Canvas App in a Visualforce Page
Subscribing to Events
Unsubscribing from Events in a Visualforce Page
Canvas Apps in a Page Layout or a Mobile Card
Canvas Apps in the Publisher
Canvas Apps in the Chatter Feed
Canvas in the Salesforce1 App
Customizing Your App Lifecycle
Reference
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Unsubscribing from Events in a Visualforce Page

The following code example shows how to call the unsubscribe method within a Visualforce page to unsubscribe from two events.