var fieldFamilyName, fieldGivenName;

// Array to save

var contacts = [];

​

function init() {

  fieldFamilyName=document.getElementById("familyName");

  fieldGivenName= document.querySelector("#givenName");

​

  console.log("I'm checking if there are customers in local storage");

  if(localStorage.contacts) {

    contacts = JSON.parse(localStorage.contacts);

  } 

  console.log("init done");

}

​

function submitForm()  {

  //when we execute this function, the form content is necessary valid

  console.log("form saved");

  console.log("Family name's value : " + fieldFamilyName.value);

 // We create a JavaScript object for the contact

​

 var contact = {};

  contact.familyName = fieldFamilyName.value;

  contact.givenName = fieldGivenName.value;

  // Add the curent contact to the array

  contacts.push(contact);

  // Save in JSON

  localStorage.contacts = JSON.stringify(contacts);

  return false;

}