Check if document signed

function configureViewerUI(viewer) {
    var React = viewer.getType("React");
    viewer.addDefaultPanels();
    viewer.onAfterOpen.register(function() {
        viewer.getSignatureInfo().then(function (signatureInfo) {
            let s = "";
            const detailsJsx = [];
            if(signatureInfo.signed) {
              detailsJsx.push(React.createElement("h4", { style: { padding: "0 2px 0px 3px", margin: "0" } }, 
                        "SIGNED BY FIELDS:"));
              for(let i = 0; i < signatureInfo.signedByFields.length; i++) {
                const signedField = signatureInfo.signedByFields[i], signatureValue = signedField.signatureValue,
				      signerName = signatureValue.name, location = signatureValue.location,
                      signDate = viewer.pdfStringToDate(signatureValue.modificationDate).toDateString();
                detailsJsx.push(React.createElement("p", { style: { padding: "0 10px 4px 10px", margin: "0" } }, 
                   `• ${signedField.fieldName}, signer: ${signerName}, location: ${location}, date: ${signDate}.`));
              }
              s = "The document was signed using digital signature.";
            } else {
              s = "The document is not signed.";
            }
            if(signatureInfo.signatureFields.length === 0) {              
                detailsJsx.push(React.createElement("h4", { style: { padding: "0 2px 0px 3px", margin: "0" } }, 
                        "NO SIGNATURE FIELDS."));
            } else {
                detailsJsx.push(React.createElement("h4", { style: { padding: "0 2px 0px 3px", margin: "0" } }, 
                        "ALL SIGNATURE FIELDS:"));
              for(const field of signatureInfo.signatureFields) {
                detailsJsx.push(React.createElement("span", { style: { padding: "0 2px 0px 10px", margin: "0" } }, 
                        `'${field.fieldName}'; `));
              }
            }           
            viewer.showMessage(s, detailsJsx);

        });
    }); 
}
window.onload = function() {
    var viewer = new DsPdfViewer("#viewer");
    configureViewerUI(viewer);
    viewer.open("/document-solutions/javascript-pdf-viewer/demos/product-bundles/assets/pdf/signature-info.pdf");
}