If Radio Button is selected, perform validation on Checkboxes

Question

I\'m trying to work this form so when the first radio button is selected, run a certain validation. When the second radio button is selected, run a different validation, etc

Answer 1

function validateDays() {
    if (document.getElementById("option1").checked == true) {
        alert("You have selected Option 1");
    }
    else if (document.getElementById("option2").checked == true) {
        alert("You have selected Option 2");
    }
    else if (document.getElementById("option3").checked == true) {
        alert("You have selected Option 3");
    }
    else {
        // DO NOTHING
        }
    }