Answer:
Hi there! This question is asking to write a Javascript validation function to validate user input. Assuming the input fields have the id set as “phone_number” for the phone input, and “user_name” for the User’s name, we can write the function below to do the validation as required.
Explanation:
function validateForm() {
if isNaN(document.getElementById(“phone_number”).value) {
document.getElementById(“phone_number”).addClass(“error”)
console.log(“Phone number is invalid”)
}
if document.getElementById(“user_name”).length < 11 {
document.getElementById(“user_name”).addClass(“error”)
console.log(“User name is invalid”)
}
document.getElementById(“submit”).addEventListener(“click”, function(e) {
if document.getElementById(“phone_number”).hasClass("error") || document.getElementById(“user_name”).hasClass(“error”) {
e.preventDefault();
}
});
}
