auto-post-id.js

function getPageName(url) {
  var index = url.lastIndexOf("/") + 1;
  var filenameWithExtension = url.substr(index);
  var filename = filenameWithExtension.split(".")[0];
  return filename;                                    
}

var url = window.location.href;
var fileName = getPageName(url);

var vidy = new Vidy({
  appid: 'YOUR_APP_ID_HERE',
  postid: filename,
  content: '.className' OR '#elementID',
  autoload: true
});