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

ASP.NET renders a table and a bunch of other mark-up around the actual radio inputs. The following should work:-

 var list = document.getElementById("radios"); //Client ID of the radiolist var inputs = list.getElementsByTagName("input"); var selected; for (var i = 0; i < inputs.length; i++) {      if (inputs[i].checked) {          selected = inputs[i];          break;       }  }  if (selected) {       alert(selected.value);  }

Try this to get the selected value from the RadioButtonList.

var selectedvalue = $('#<%= yourRadioButtonList.ClientID %> input:checked').val()

I always View Source. You will find each radio button item to have a unique id you can work with and iterate through them to figure out which one is Checked.

Edit: found an example. I have a radio button list rbSearch. This is in an ascx called ReportFilter. In View Source I see

ReportFilter1_rbSearch_0ReportFilter1_rbSearch_1ReportFilter1_rbSearch_2

So you can either loop through document.getElementById("ReportFilter1_rbSearch_" + idx ) or have a switch statement, and see which one has .checked = true.