Question: `<select><option><input type="checkbox" />Headache</option></select>`

By using the above code i did't get a check box inside a dropdown list.Can you suggest me , how should i proceed.

Answer: 
You can't have an input control inside a select element. You'll have to create the drop-down using JavaScript, without using the select element at all.
if we want to perform action on a button along with this checked listbox use javascript and html both.the following code may be helpful to u.

```
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">

    <html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Check box list</title>
    </head>

    <script type="text/javascript" language="javascript">
        function selectCheckBox()
        {
            var total="";
            for(var i=0; i < document.form.languages.length; i++)
            {
                if(document.form.languages[i].checked)
                {
                    total +=document.form.languages[i].value + "\n";
                }
            }
            if(total=="")
            {
                alert("select checkboxes");
            }
            else
            {
                alert("Selected Values are : \n"+total);
            }
        }
    </script>

    <body>
        <form id="form" name="form" method="post" action="CheckBox.jsp">
            <div style="overflow: auto; width: 100px; height: 80px; border: 1px solid #336699; padding-left: 5px">
                <input type="checkbox" name="languages" value="English"> English<br>
                <input type="checkbox" name="languages" value="Hindi"> Hindi<br>
                <input type="checkbox" name="languages" value="Italian"> Italian<br>
                <input type="checkbox" name="languages" value="Chinese"> Chinese<br>
                <input type="checkbox" name="languages" value="Japanese"> Japanese<br>
                <input type="checkbox" name="languages" value="German"> German<br>
            </div>

            <br/><input type="button" name="goto" onClick="selectCheckBox()"value="Check">
        </form>
    </body>

```