Javascript – How to get value of selected radio button


I want to get the selected value from a group of radio buttons.

Here's my HTML:

<div id="rates">
  <input type="radio" id="r1" name="rate" value="Fixed Rate"> Fixed Rate
  <input type="radio" id="r2" name="rate" value="Variable Rate"> Variable Rate
  <input type="radio" id="r3" name="rate" value="Multi Rate" checked="checked"> Multi Rate  

Here's my js:

var rates = document.getElementById('rates').value;
var rate_value;
if(rates =='Fixed Rate'){
    rate_value = document.getElementById('r1').value;
}else if(rates =='Variable Rate'){
    rate_value = document.getElementById('r2').value;
}else if(rates =='Multi Rate'){
    rate_value = document.getElementById('r3').value;

document.getElementById('results').innerHTML = rate_value;

I keep getting undefined.

Best Solution

This works in IE9 and above and all other browsers.