vesta/web/templates/admin/add_user.js.html

  <script>
    $(function() {
      $('#v_email').change(function() {
        document.getElementById('v_notify').value = document.getElementById('v_email').value;
      });
    });

    function randomString() {
      var chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz';
      var string_length = 10;
      var randomstring = '';
      for (var i = 0; i < string_length; i++) {
        var rnum = Math.floor(Math.random() * chars.length);
        randomstring += chars.substr(rnum, 1);
      }
      document.v_add_user.v_password.value = randomstring;
    }
  </script>