TryIt Editor v2.0 - Form validation with JS

Source Code: (back to article)

Result: Report an issue

function ValidationForm() {
  let username = document.forms["RegForm"]["Name"];
  let email = document.forms["RegForm"]["Email"];
  let phoneNumber = document.forms["RegForm"]["Telephone"];
  let select = document.forms["RegForm"]["Subject"];
  let pass = document.forms["RegForm"]["Password"];
  if (username.value == "") {
    alert("Please enter your name.");
    username.focus();
    return false;
  }
  if (email.value == "") {
    alert("Please enter a valid e-mail address.");
    email.focus();
    return false;
  }
  if (email.value.indexOf("@", 0) < 0) {
    alert("Please enter a valid e-mail address.");
    email.focus();
    return false;
  }
  if (email.value.indexOf(".", 0) < 0) {
    alert("Please enter a valid e-mail address.");
    email.focus();
    return false;
  }
  if (phoneNumber.value == "") {
    alert("Please enter your telephone number.");
    phoneNumber.focus();
    return false;
  }
  if (pass.value == "") {
    alert("Please enter your password");
    pass.focus();
    return false;
  }
  if (select.selectedIndex < 1) {
    alert("Please enter your course.");
    select.focus();
    return false;
  }
  return true;
}