test.js

var script = document.createElement('script');
	
script.onload = function () {

  TXDocumentViewer.init( {
    containerID: m_containerID,
    viewerSettings: {
      toolbarDocked: true,
      dock: "Fill",
      userNames: m_userNames,
      isSelectionActivated: m_isSelectionActivated,
      showThumbnailPane: m_showThumbnailPane,
      basePath: m_serviceURL + "/documentviewer",
      oauthSettings: {
        accessToken: m_accessToken
      }
    }
  });

};

getAccessToken(function(token) {
  m_accessToken = token;
  script.src = m_serviceURL + 
    "/documentviewer/textcontrol/GetResource?Resource=minimized.tx-viewer.min.js&access_token=" +
    m_accessToken;
  document.head.appendChild(script);
});