Chatter Feed Context Considerations

When you display a canvas app inside of a feed item, the context information you receive from the signed request or from a getContext() call contains information specific to the feed:

• Location—If the canvas app is in the feed, then the Environment.displayLocation field contains the value ChatterFeed.

• Parameters—When you create a feed item that contains a canvas app, you can specify a JSON string as the parameters value. When the canvas app receives the context, the parameters in the feed item will be contained in the Environment.Parameters object.

• Size—The Environment.Dimensions object contains information about the size of the canvas app.

  • The canvas app height defaults to 100 pixels.

  • The canvas app width defaults to 420 pixels, which is the same as the maximum width of a canvas app in the feed.

  • The maximum height of a canvas app in the feed is 400 pixels.

  • The maximum width of a canvas app in the feed is 420 pixels.

  • This code snippet shows the default size values of a canvas app in the feed:

  • The feed is a fixed width of 420 pixels. For example, if you resize your canvas app to be 200 pixels, the feed width remains 420 pixels.

  • You can use the resize() method in the Canvas SDK to change the values of your canvas app up to the maxHeight and maxWidth.

See Also

• Canvas Apps in the Chatter Feed
• Environment
• Dimensions
• Resizing a Canvas App
• Chatter Feed Canvas App Access Considerations