jQuery`.val`报告选择值，未选择任何选项

Question

I have a select that looks like this:

<select id   = "baz"
        name = "Baz"
        size = 1>
  <option value="A1"> foo</option>
  <option value="A2"> bar</option>
  ...etc
  <option value="A99"> bat</option>
</select>

I've pulled this code from Firebug (and edited it), as the options themselves are read from the server by a CGI #include .

The value of the select is eventually read by JavaScript as follows:

var $input_baz = $("#baz");
...
var baz_pl = $input_baz.val();

Problem: the select is in a hidden div, and no selections have been made, but baz_pl contains the value A1 . Why is .val() returning the first entry when nothing has been selected, and is there a simple fix for this? The select appears in a popup, and I can add code to detect if the popup 'Ok' button has been clicked, but I'd rather do it properly if possible.

Answer 1

The first option is always selected by default. You could add a dummy entry as first one, with a value that does not occur otherwise in the list.

For example:

<option value="-1">-- Please select --</option>