SET CALLBACK EXAMPLE

This example demonstrates the callback support of the Zoomify Image Viewer. Use the Set Callback and Clear Callback buttons to assign a function to execute whenever the view is changed by zooming or panning. The Zoomify Image Viewer supports callback assignments on initialization, view changes, data loading, and more.

To see this example callback in action simply click the Set Callback button, then click the image to zoom - notice the alert when the zoom completes. Click the Clear Callback button and zoom again to verify the callback has been cleared.

Additional callback options are listed below. Note that creation of custom callbacks simply requires adding a validation call at the desired point in the code. For example: Z.Utils.validateCallback('myCustomCallback'); See the Zoomify Function List in the Developer Resources folder for details. Supported callbacks include:

Note that additional visibility into the actions of the Viewer can be had using the function getStatus. See the Function List for more information.

annotationsLoaded	currentLabelChangedGetID	drawLabelsOnCanvasComplete
galleryInitialized	labelCreated	labelCreatedGetInternalID
labelSaved	labelSavedGetJSONObject	labelSelectedInViewportGetIDs
loadingTilesComplete	loadingTilesCompleteGetLabelIDs	loadingTilesFullImageComplete
navigatorInitialized	noteSaved	panConstrained
poiSaved	rulerInitialized	screensaverStarting
slideshowLoaded	toolbarInitialized	tourLoaded
trackingLoaded	trackingLoaded	usersLoaded
viewChanged	viewChanging	viewPanned
viewZoomed	viewUpdateComplete	viewUpdateCompleteGetLabelIDs
viewZoomingGetCurrentZoom	viewportChanged	zoomConstrainedMax
zoomConstrainedMin