backing up hardware

$post.js

var sendData = function(type, URL, formData, callBack){
  // create a XHR object
  var xhr = new XMLHttpRequest();
  // open the XHR object in asynchronous mode
  xhr.open(type, URL, true);
  //xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded; charset=ISO-8859-1')
  xhr.onreadystatechange = function() {
    if (xhr.readyState == 4 && xhr.status == 200) {
      // OK! we have a successful response.
      var response = xhr.responseText;
      //console.log('OUTPUT: ' + response);
      // do something else with the response
      callBack(URL, response);
    }
  };
  // GET or POST the URL according to type
  if(type == "GET"){
    xhr.send();
  }
  if(type == "POST"){
    xhr.send(formData);
  }
};

ctrlq.js

var getBookDetails = function(isbn) {
  // => https://ctrlq.org/code/20020-query-book-by-isbn
  if(isbn.length == 10 || isbn.length == 13){
    var url = "https://www.googleapis.com/books/v1/volumes?q=isbn:" + isbn;
    sendData("GET", url, "", function(url, response) {
      var results = JSON.parse(response);

      document.getElementById('isbnOutput').innerHTML = "[API] <br> URL: " + url + "<br> Response: " + response;

      if (results.totalItems == 1) {
        // There'll be only 1 book per ISBN
        var book = results.items[0];

        var title = (book["volumeInfo"]["title"]);
        var authors = (book["volumeInfo"]["authors"]);
        var publisher = (book["volumeInfo"]["publisher"]);

        var subtitle = (book["volumeInfo"]["subtitle"]);
        var printType = (book["volumeInfo"]["printType"]);
        var pageCount = (book["volumeInfo"]["pageCount"]);
        var publishedDate = (book["volumeInfo"]["publishedDate"]);
        var webReaderLink = (book["accessInfo"]["webReaderLink"]);

        var remarks = "Published Date: " + publishedDate;

        document.getElementById('bookname').value = title;
        document.getElementById('bookauthor').value = authors;
        document.getElementById('bookpublisher').value = publisher;
        document.getElementById('bookremarks').value = remarks;
      }
    });
  }
  // => https://ctrlq.org/code/20020-query-book-by-isbn
};