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

The HTML equivalent to ASP.NET RadioButtonList, is a set of with the same name attribute(based on ID property of the RadioButtonList).

You can access this group of radio buttons using getElementsByName. This is a collection of radio buttons, accessed through their index.

alert( document.getElementsByName('RadioButtonList1') [0].checked );