[Home](./index.md) > [@snowplow/browser-tracker](./browser-tracker.md) > [PageViewEvent](./browser-tracker.pageviewevent.md) > [contextCallback](./browser-tracker.pageviewevent.contextcallback.md) ## PageViewEvent.contextCallback property A callback which will fire on the page view and each subsequent activity tracking event for this page view Signature: ```typescript contextCallback?: (() => Array) | null; ```