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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Example</title>
</head>
<body>
  <form id="theform">
    <label><input type="checkbox" value="1" checked>Uno</label>
    <br><label><input type="checkbox" value="2" checked>Due</label>
    <br><label><input type="checkbox" value="3">Tre</label>
    <br><input type="button" id="thebutton" value="Click">
  </form>
  <script>
    document.getElementById("thebutton").onclick = function() {
      var id_form = "theform";
      var vettore = document.getElementById(id_form).elements;
      
      var contatore = 0;
      var valore_corrente;
      var stringaFileSelezionati = "";
      
      for (var i = 0; i < vettore.length; i++)
      {
        if (vettore[i].checked)
        {
          contatore++;
          
          valore_corrente = vettore[i].value;
          
          stringaFileSelezionati+= valore_corrente;
          
          stringaFileSelezionati+= '?';
        }
      }
      
      if (contatore == 0) 
      {
        alert('Error!!! No file selected!');
        return false;
      }
      else 
      {
        alert(stringaFileSelezionati);
        
      }
      
    };
  </script>
</body>
</html>
Output

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