<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <title></title>
</head>
<body>
    <form>
        <select name="single">
            <option>Single1</option>
            <option>Single2</option>
        </select>
        <br />
        <select name="multiple" multiple="multiple">
            <option selected="selected">Multiple1</option>
            <option>Multiple2</option>
            <option selected="selected">Multiple3</option>
        </select>
        <br/>
        <input type="checkbox" name="check" value="check1" id="ch1"/>
        <label for="ch1">check1</label>
        <input type="checkbox" name="check" value="check2" checked="checked" id="ch2"/>
        <label for="ch2">check2</label>
        <br />
        <input type="radio" name="radio" value="radio1" checked="checked" id="r1"/>
        <label for="r1">radio1</label>
        <input type="radio" name="radio" value="radio2" id="r2"/>
        <label for="r2">radio2</label>
    </form>
    <p id="results"></p>
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
    <script>
        function showValues() {
            var str = $("form").serialize();
            $("#results").text(str);
        }
        $(":checkbox, :radio").click(showValues);
        $("select").change(showValues);
        showValues();
    </script>
</body>
</html>