多拉的博客

Duolaa的第一个Ajax程序……

function createAJAX()
{
if (window.XMLHttpRequest)
{
  var oHttp = new XMLHttpRequest();
  return oHttp;
}
else if (window.ActiveXObject)
{
  var versions = [
   "MSXML2.XmlHttp.6.0",
   "MSXML2.XmlHttp.3.0"
  ];
  for (var i = 0; i < versions.length; i++)
  {
   try {
    var oHttp = new ActiveXObject(versions[i]);
    return oHttp;
   } catch (error) {}
  }
     }
throw new Error("Your browser doesn't support XMLHttpRequest");
}

function TypeSelect()
{
send_ajax = createAJAX();
send_ajax.open('POST','typeid.php',true);//typid.php是要接收处理传值的页面
send_ajax.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
send_ajax.onreadystatechange = send_ajax_change;
var TypeString = document.form1.TypeId.value;
//alert(TypeString);
send_ajax.send("TypeId="+TypeString);

}
send_ajax_change  = function()
{
if (send_ajax.readyState == 4)
{
  if (send_ajax.status != 200)
  {
   send_ajax_error();
  
   return;
  
  }
  //alert (send_ajax.responseText);
  document.getElementById("ww").options.length = 0;
  var CatLine = send_ajax.responseText;
  var Arr= CatLine.split("#");
  //alert (Arr[0]);
  var Car
  for (var i = 0; i < Arr.length; i++ )
  {
  var CarArr=Arr[i].split("|");
  //alert (CarArr[0]);
  var myOption= new Option(CarArr[1],CarArr[0]);
  document.getElementById("ww").options.add(myOption);
  }
}
}

PHP的部分就不贴了，就是从数据库提个数组合成一个字串，和一般的POST一样一样的阿。