JavaScript read radio button value in IE and FireFox

Question

I have a simple web form that uses JavaScript for building a POST statement. In Chrome, I can use a simple line of code...

var form = document.forms[\'myForm\'];         


        

Answer 1

Short & clear on ES-2015, for use with Babel:

function getValueFromRadioButton( name ){
  return [...document.getElementsByName(name)]
         .reduce( (rez, btn) => (btn.checked ? btn.value : rez), null)
}

console.log( getValueFromRadioButton('payment') );