Custom tool to distinguish signatures

[Matt Parizeau]

Q:

We want the user to be able to write a signature on the document and then be able to distinguish that signature in the XFDF and apply it to the PDF. Is that possible?

A:

You could create a custom tool in WebViewer based on the Free Hand tool and then add a custom attribute to the xfdf to identify that the annotation is a signature. You could use code like the following:

var SignatureCreateTool = function(docViewer) {
    Tools.FreeHandCreateTool.call(this, docViewer, Annotations.FreeHandAnnotation);
};
SignatureCreateTool.prototype = new Tools.FreeHandCreateTool();
SignatureCreateTool.prototype.complete = function() {
    if (this.annotation) {
        this.annotation.isSignature = true;
        Tools.FreeHandCreateTool.prototype.complete.apply(this, arguments);
    }
};

var oldFreeHandSerialize = Annotations.FreeHandAnnotation.prototype.serialize;
Annotations.FreeHandAnnotation.prototype.serialize = function() {
    var el = oldFreeHandSerialize.apply(this, arguments);
    if (this.isSignature) {
        $(el).attr('signature', 'true');
    }
    return el;
};

$(document).on('documentLoaded', function() {
    $("#toolModePicker").append('<li id="annot-button-signature" data-toolmode="AnnotationCreateSignature" title="Signature"><img src="custom_signature_image.png"/></li>');
    readerControl.toolModeMap['AnnotationCreateSignature'] = SignatureCreateTool;
});