How to get value of selected radio button?

Question

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

Here\'s my HTML:

Answer 1

In Javascript we can get the values by using Id's "getElementById()" in the above code you posted has contain name not Id so you to modify like this

if (document.getElementById('r1').checked) {
  rate_value = document.getElementById('r1').value;
}

use this rate_value according to your code