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.
html code:

Username:

JAVA:

var form = document. getElementById("userForm");

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

/* Your solution goes here */

}

form. addEventListener("submit", validateForm);

The answer & explanation for this question is given in the attachment below.

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