Annotation events

In this document
chevron_rightannotationChanged
chevron_rightannotationSelected

There are a number of events related to annotations that can be useful to hook into. To do this you'll add a listener to the AnnotationManager in the viewerLoaded event.

Do not add the listener in the documentLoaded event
This will cause a new listener to be attached every time a new document is loaded
$(document).on('viewerLoaded', function() {
  var annotManager = readerControl.docViewer.getAnnotationManager();
  annotManager.on('annotationChanged', function() {
    // ...
  });
});

annotationChanged

The annotationChanged event is fired every time an annotation is added, modified or deleted. The handler takes three parameters; the event object, an array of annotations that have changed and a string for the action (add, modify, delete).

$(document).on('viewerLoaded', function() {
  var annotManager = readerControl.docViewer.getAnnotationManager();
  annotManager.on('annotationChanged', function(event, annotations, action) {
    if (action === 'add') {
      console.log('this is a change that added annotations');
    } else if (action === 'modify') {
      console.log('this change modified annotations');
    } else if (action === 'delete') {
      console.log('there were annotations deleted');
    }

    annotations.forEach(function(annot) {
      console.log('annotation page number', annot.PageNumber);
    });
  });
});
The annotationChanged event will also be fired whenever annotations are imported from your server or inside the document, that is, they weren't created directly by a user.

If you want to do something different in that case, maybe ignore those events, you can use the imported property of the event object. For example:

annotManager.on('annotationChanged', function(event, annotations, action) {
  if (event.imported) {
    return;
  }
  // do event handling
});

annotationSelected

The annotationSelected event is fired any time an annotation is selected or deselected in the UI. The parameters are similar to annotationChanged; there is an event object, array of annotations and a string for the action (selected or deselected). If all annotations have been deselected then the annotations array will be null.

annotManager.on('annotationSelected', function(event, annotations, action) {
  if (action === 'selected') {
    console.log('annotation selection');
  } else if (action === 'deselected') {
    console.log('annotation deselection');
  }

  console.log('annotation list', annotations);

  if (annotations === null && action === 'deselected') {
    console.log('all annotations deselected');
  }
});

Annotations can be selected from the UI by clicking on them and once selected there will be a dashed border drawn around them. To programmatically select/deselect annotations you can use the selectAnnotation(s) and deselectAnnotation(s) functions. The getSelectedAnnotations will tell you which annotations are currently selected. For example, the following code deselects one of the currently selected annotations:

var selectedAnnots = annotManager.getSelectedAnnotations();
if (selectedAnnots.length > 0) {
  var firstSelectedAnnot = selectedAnnots[0];
  annotManager.deselectAnnotation(firstSelectedAnnot);
}

There are several more events on AnnotationManager that may be useful to you.