gistfile1.js

(function() {
  function getRequest() {
    var a = null;
    if (window.XMLHttpRequest) {
      try {
        a = new XMLHttpRequest;
      }
      catch(c) {
        }
    } else if (window.ActiveXObject) {
      for (var d = 0, b; b = ["MSXML2.XMLHTTP.6.0",
                              "MSXML2.XMLHTTP.3.0",
                              "MSXML2.XMLHTTP",
                              "Microsoft.XMLHTTP"][d++];) {
        try {
          a = new ActiveXObject(b);
          break;
        } catch(c) {}
      }
    }
    return a;
  }

  function log(obj) {
    var params,
    request = getRequest();

    for (var i in obj) {
      params += '&';
      params += i + '=' + encodeURI(obj[i]);
    }

    request.open("POST", "/rpc/client-error-log");

    request.setRequestHeader("Content-type",
                                "application/x-www-form-urlencoded");
    request.setRequestHeader("Content-length", params.length);
    request.setRequestHeader("Connection", "close");

    request.send(params);
  }

  function errorHandler(message, url, line) {
    if (url) {
      var obj = {
        'message': message,
        'url': url,
        'line': line
      };

      obj['href'] = (window.location ? window.location.href: '?');

      log(obj);
    }

    return true;
  }

  window.onerror = errorHandler;
})();