Creating a signature field in a PDF using JavaScript

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Julio Cesar Llavilla Ccama

Apr 6, 2021, 11:45:25 AM4/6/21
to PDFTron WebViewer
I want to create a field in which a signature can be inserted something like what is indicated in the documentation:
      path: 'lib/',
      fullAPI: true,
      initialDoc: 'example0006.pdf',
      //config: 'config.js',
    }, document.getElementById('viewer')).then(async instance => {
      const { Annotations, annotManager, PDFNet, CoreControls, signatureWidgetAnnots, docViewer  } = instance;

      const createSignHereElement = Annotations.SignatureWidgetAnnotation.prototype.createSignHereElement;
      Annotations.SignatureWidgetAnnotation.prototype.createSignHereElement = function() {
        const signHereElement = createSignHereElement.apply(this, arguments); = 'red';
        return signHereElement;


I have tried everything and it has not worked for me, please if anyone knows how it works I will appreciate it very much.



Apr 6, 2021, 3:47:02 PM4/6/21
to PDFTron WebViewer
Hi there, 

Thanks for reaching out!

If you would like to add a signature field to a PDF directly in the web browser, you can take a look at this sample:
The sample code is available in the `WebViewer/samples/forms/form-builder` if you download the WebViewer folder and also available online:

Best Regards, 
Jimmy Lin
Software Developer
PDFTron Systems, Inc.

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