validate.js

var nameError = document.getElementById('name-error');
var emailError = document.getElementById('email-error');
var subjectError = document.getElementById('subject-error');
var messageError = document.getElementById('message-error');
var submitError = document.getElementById('submit-error');

function validateName(){
  var name = document.getElementById('name').value;
  if(name.trim() === ""){
    nameError.innerHTML = 'Name is required';
    return false;
  }
  if(!name.match(/^[A-Za-z]\s{1}[A-Za-z]$/)){
    nameError.innerHTML = 'Enter your full name';
    return false;
  }
  nameError.innerHTML = '';
  return true;
}
function validateEmail(){
  var email = document.getElementById('email').value;
  if(email.count == 0){
    emailError.innerHTML = 'Email is required';
    return false;
  }
  // if(!email.match(/^[A-Za-z\._\-[0-9][@][A-Za-z][\.][a-z]{2,4}$/)){
  //   emailError.innerHTML = 'Email Invalid';
  //   return false;
  // }
  emailError.innerHTML = '';
  return true;
}
function validateSubject(){
    var subject = document.getElementById('subject').value;
    if(subject.trim() === ""){
      subjectError.innerHTML = 'Subject is required';
      return false;
    }
    subjectError.innerHTML = '';
    return true;
  }
  function validateMessage(){
    var message = document.getElementById('message').value;
    var required = 30;
    var left = required - message.trim().length;
  
    if(left > 0){
      messageError.innerHTML = left + ' more characters required';
      return false;
    }
    messageError.innerHTML = '';
    return true;
}