How can I determine the SelectedValue of a RadioButtonList in JavaScript?

Question

I have an ASP.NET web page with a databound RadioButtonList. I do not know how many radio buttons will be rendered at design time. I need to determine the SelectedValue on

Answer 1

For a 'RadioButtonList with only 2 values 'yes' and 'no', I have done this:

var chkval=document.getElemenById("rdnPosition_0")

Here rdnposition_0 refers to the id of the yes ListItem. I got it by viewing the source code of the form.

Then I did chkval.checked to know if the value 'Yes' is checked.