function getXhr(){ var xhr = null; if(window.XMLHttpRequest){ xhr = new XMLHttpRequest(); } else if(window.ActiveXObject){ try { xhr = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) { xhr = new ActiveXObject("Microsoft.XMLHTTP"); }} else { alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest..."); xhr = false; } return xhr; } function change(){ var xhr = getXhr(); xhr.onreadystatechange = function(){ if(xhr.readyState == 4 && xhr.status == 200){ di = document.getElementById('ville'); di.innerHTML = xhr.responseText; }} xhr.open("POST","ville.php",true); xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded'); iddepartement = document.getElementById('departement').options[document.getElementById('departement').selectedIndex].value; xhr.send("idDepartement="+iddepartement); }