Events

viewer.on subscribes to one event and returns a function that removes that listener. The payload is the only argument.

const stop = viewer.on("open", ({ document }) => {
  document.info();
});

Event	When it fires	Payload
loading	open has started	{ name? }
open	The file is open	{ document }
close	The file is closed	{}
change	An edit is applied	{ command, result }
selection	The selection changes	SelectionState or null
highlight	A highlight is applied or cleared	{ color, text, ranges, anchor, focus }
annotation	A comment is attached to a highlight	{ id, text, quote, ranges, anchor, focus }
replaceImage	The host can swap the selected image	{ id, page, file }
error	Open or a command fails	{ error }
export	The edited file is exported	{ name, blob }
zoom	The zoom changes	{ zoom }
theme	The palette on screen changes	{ theme }
viewMode	The mode changes	{ mode } is live, track, or view
search	A search moves to a hit	{ query, hitCount, hitIndex }

hitIndex is zero-based, or -1 when there are no hits. highlight.color is null when the highlight was cleared.