Fill the validateForm function to check that the phone number contains a number (use the isNaN function) and that the user name is less than 11 characters long. Display "Phone number is invalid" and/or "User name is invalid" in the console log if the check does not pass. Use the preventDefault function to avoid submitting the form when the inputs are invalid. let form = document. getElementById("userForm");

function validateForm(event) {
let phoneNumber = form. phoneNumber. value;
let userName = form. userName. value;

/* Your solution goes here */

}

form. addEventListener("submit", validateForm);