var Http_request=false;
function send_request (URL) {//initialization, specifying handler functions, sending requested functions
Http_request=false;
Start initializing the XMLHttpRequest object
if (window. XMLHttpRequest) {//mozilla browser
Http_request=new XMLHttpRequest ();
if (http_request.overridemimetype) {//Set MIME category
Http_request.overridemimetype ("Text/xml");
}
}
else if (window. ActiveXObject) {//ie browser
try{
Http_request=new ActiveXObject ("msxml2.xmlhttp");
}catch (e) {
try{
Http_request=new ActiveXObject ("Microsoft.XMLHTTP");
}catch (e) {}
}
}
if (!http_request) {//exception, failed to create object instance
Window.alert ("Create XMLHTTP object failed!") ");
return false;
}
Http_request.onreadystatechange=processrequest;
Determine how to send the request, the URL, and whether to execute the next code synchronously
Http_request.open ("Get", url,true);
Http_request.send (NULL);
}
Functions that process return information
function ProcessRequest () {
if (http_request.readystate==4) {//Judge object state
if (http_request.status==200) {//information returned successfully, start processing information
document.getElementById (reobj). Innerhtml=http_request.responsetext;
}
else{//page is not normal
Alert ("The page you requested is not normal!") ");
}
}
}
function GetClass (obj) {
var Pid=document.form1.select1.value;
document.getElementById (obj). innerhtml= "<option>loading...</option>";
Send_request (' doclass.php?pid= ' +pid);
Reobj=obj;
}
<?php
Header ("CONTENT-TYPE:TEXT/HTML;CHARSET=GBK")//output encoding to avoid Chinese garbled
$pid =$_get[' pid '];
$db =mysql_connect ("localhost", "root", "7529639"); Creating a database connection
mysql_query ("Set names ' GBK '");
mysql_select_db ("Menuclass");
$sql = "Select classname from Menu where parentid=". $pid. "";
$result =mysql_query ($sql);
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