// Ajax contact form v1.0
// Andrea Frasca

function createRequestObject() {
    var req_obj;
    var browser = navigator.appName;
    if(browser == "Microsoft Internet Explorer"){
        req_obj = new ActiveXObject("Microsoft.XMLHTTP");
    }else{
        req_obj = new XMLHttpRequest();
    }
    return req_obj;
}

var http = createRequestObject();

// funzione controllo campi form e invio email
function invia_email() {
		
		if(document.contactform.name.value=="") { 
			document.getElementById('warn_message').style.display = 'block';
			document.getElementById('warn_message').innerHTML	= 'Name field is required!';
			document.contactform.name.focus();
		}else if(document.contactform.email.value=="") { 
			document.getElementById('warn_message').style.display = 'block';
			document.getElementById('warn_message').innerHTML	= 'Email address field is required!';
			document.contactform.email.focus();
		}else if(document.contactform.subject.value=="") {
			document.getElementById('warn_message').style.display = 'block';
			document.getElementById('warn_message').innerHTML	= 'Subject field is required!';
			document.contactform.subject.focus();
		}else if(document.contactform.msg.value=="") { 
			document.getElementById('warn_message').style.display = 'block';
			document.getElementById('warn_message').innerHTML	= 'Message field is required!';
			document.contactform.msg.focus();
		
		}else{
			
		var v_msg = document.contactform.msg.value;
		var v_name = document.contactform.name.value;
		var v_email = document.contactform.email.value;
		var v_subject = document.contactform.subject.value;
		
		// Messaggio di invio in corso visualizzato sul bottone
		document.contactform.send.disabled	=	true; 
		document.contactform.send.value	= 'Sending message...';
			
		http.open('get', 'sendmail.php?msg='+v_msg+'&name='+v_name+'&subject='+v_subject+'&email='+v_email+'&action=send');
   		http.onreadystatechange = handleResponse;
   		http.send(null);
	
		}
}

// funzione che gestisce la risposta
function handleResponse() {
    if(http.readyState == 4){
        var response = http.responseText;
        var update = new Array();

        if(response.indexOf('|' != -1)) {
			update = response.split('|');
	
			document.getElementById(update[0]).innerHTML = update[1];
         	
        }
    }
}