Contacts Store Application Javascript with jQuery code

contactsApp.js

//create firebase reference
var dbRef = new Firebase("https://contactb.firebaseio.com/");
var contactsRef = dbRef.child('contacts')

//load older conatcts as well as any newly added one...
contactsRef.on("child_added", function(snap) {
  console.log("added", snap.key(), snap.val());
  $('#contacts').append(contactHtmlFromObject(snap.val()));
});

//save contact
$('.addValue').on("click", function( event ) {  
    event.preventDefault();
    if( $('#name').val() != '' || $('#email').val() != '' ){
      contactsRef
        .push({
          name: $('#name').val(),
          email: $('#email').val(),
          location: {
            city: $('#city').val(),
            state: $('#state').val(),
            zip: $('#zip').val()
          }
        })
        contactForm.reset();
    } else {
      alert('Please fill atlease name or email!');
    }
  });

//prepare conatct object's HTML
function contactHtmlFromObject(contact){
  console.log( contact );
  var html = '';
  html += '<li class="list-group-item contact">';
    html += '<div>';
      html += '<p class="lead">'+contact.name+'</p>';
      html += '<p>'+contact.email+'</p>';
      html += '<p><small title="'
                +contact.location.zip+'">'
                +contact.location.city
                +', '
                +contact.location.state
                +'</small></p>';
    html += '</div>';
  html += '</li>';
  return html;
}