var rad = document.myForm.myRadios; var prev = null; for (var i = 0; i < rad.length; i++) { rad[i].addEventListener('change', function() { (prev) ? console.log(prev.value): null; if (this !== prev) { prev = this; } console.log(this.value) }); }
<form name="myForm"> <input type="radio" name="myRadios" value="1" /> <input type="radio" name="myRadios" value="2" /> </form>
Here’s a JSFiddle demo: https://jsfiddle.net/crp6em1z/
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