Get XFDF data from specific annotations

[Matt Parizeau]

Q:

How can I get the XFDF data from a specific list of annotations and not all annotations?

A:

Unfortunately it's not completely straightforward to get the XFDF data from a single annotation, but there is a roundabout way that you can do it:

function getXFDFData(annots) {
    var annotManager = readerControl.docViewer.GetAnnotationManager();
    var serializer = new XMLSerializer();
    var xfdfData = '';
   
    var serialize = Annotations.Annotation.prototype.serialize;
    Annotations.Annotation.prototype.serialize = function(element, pageMatrix, isExport) {
        if (isExport) {
            if (annots.indexOf(this) !== -1) {
                var annotEl = this.serialize(element, pageMatrix);
                xfdfData += serializer.serializeToString(annotEl);
            }
        }

        return serialize.apply(this, arguments);
    };

    // trigger the calling of serialize on all the annotations
    annotManager.ExportAnnotations();

    // set serialize back to the original function
    Annotations.Annotation.prototype.serialize = serialize;

    return xfdfData;
}

var myData = getXFDFData(myAnnotList);

You would pass an array of annotations into the getXFDFData function and it would return their XFDF data in string format.