Question

I am using this method to answer a form randomly

  $('table').filter(function () {
      return ($(this).find('input').size() > 0);
  }).find('tr').each(function () {
      $(this).find('input').filter(function () {
          return (Math.round(Math.random()) == 1);
      }).each(function () {
          var typ = this.type;
          if (typ == 'checkbox' || typ == 'radio') {
              this.checked = true;
          }
          if (typ == 'select' || typ == 'select-one') {
              var value = $.map(this, function (elt, i) {
                  return $(elt).val();
              }).sort()[0];
              this.val(value);
          }
          if (typ = "text" || typ == "textarea") {
              $(this).val(Math.floor(Math.random() * 11));
          }
      });
  });

Answer 1

      if (typ == 'select' || typ == 'select-one') {
          var value = $.map(this, function (elt, i) {
              return $(elt).val();
          }).sort()[0];
          this.val(value);
      }

The input tag doesn´t have any select type and you can´t set the selected value this way this.val(value); as val() is a jQuery function, try $(this).val(value) (for inputs). You will have to change your slector to include select elements as well if you want to select on of its options.

      if (typ = "text" || typ == "textarea") {
          $(this).val(Math.floor(Math.random() * 11));
      }

By using a single = instead of == you are re declaring the variable making the condition true.

You should also be able to shorten the code by not using find() and each() so much. The following selector selectes input elements with in tr element within a table and then randomly filtering it as in your example.

$('table tr input').filter(function() { return (Math.round(Math.random()) == 1); })