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For events to work properly, you should set viewerId. This helps event routing to understand which component the event is to be sent to, even if there arejsm . From that method we could then continue printing. Alternatively, we could dispatch an event before beforeprint that is cancellable (or make beforeprint Hook into JavaScript events dispatched by the PDF viewer to trigger workflows and automations or to customize behavior. PSPDFKit SDKs are deployed in some This guide will go over the order of events that happen when PDF.js Express Web Viewer is instantiated and a document is loaded.