JSFiddle - React, Tailwind, and code Playground

by Lena R

HTML

<FORM>
<input type="radio" name="nameRadio" value="1"/>желтый
<input type="radio" name="nameRadio" value="2"/>белый
<input type="radio" name="nameRadio" value="3"/>голубой
<input type="radio" name="nameRadio" value="4"/>красный

<input type="button" name="bt" value="Подтвердить" onclick ="onclickRadio()" >
</FORM>

JavaScript

function f(data) {
if(data===undefined){
n = 0;
alert(‘Выберите цвет’);
}else{
n = data;
}
return n;
}
var way = f(data);
alert(way);

function onclickRadio() {
		  var nameRadio = document.getElementsByName('nameRadio');
		  	var rezultatRadio = undefined;
				  for (var i = 0; i < nameRadio.length; i++) {
					    if (nameRadio[i].type === 'radio' && nameRadio[i].checked) {
					        rezultatRadio = nameRadio[i].value; 		            
					    }
				  }	  
		 		  if(rezultatRadio === undefined){
			}
				  return f(rezultatRadio);
		}