test.js

var signatureSettings = {
    signerName: "Tim Typer",
    signerInitials: "TT",
    uniqueId: "12345-ABCDE",
    redirectUrlAfterSignature: null,
    ownerName: "Document Requestor",
    signatureBoxName: "txsign",
    showSignatureBar: true }

function readDocument(input) {
	
    input = input.srcElement;

    if (input.files && input.files[0]) {
        var fileReader = new FileReader();

        fileReader.onload = function (e) {
            TXDocumentViewer.loadDocument(
                e.target.result.split(',')[1],
                input.files[0].name,
                signatureSettings);
        };
      
        // read the file and convert it to Base64
        fileReader.readAsDataURL(input.files[0]);
    }    

}