<html> <head> <title>exam</title> <Meta http-equiv="Content-Type" content="text/html" charset="utf8"> </head> <body> <script language="javascript"> function ajaxFunction(){ xmlHttp = ''; try{ xmlHttp=new XMLHttpRequest(); }catch(e){ try{ xmlHttp=new ActiveXObject("Msxml2.XMLHTTP"); }catch(e){ try{ xmlHttp=new ActiveXObject("Miscrosoft.XMLHTTP"); }catch(e){ alert("NO AJAX"); return false; } } } return xmlHttp; } function callServer() { var xmlHttp=ajaxFunction(); var city = document.getElementById("city").value; var state = document.getElementById("state").value; if((city == null)||(city=="")) return; if((state == null)||(state=="")) return; var url = "zip.PHP?city="+escape(city)+"&state="+escape(state); xmlHttp.onreadystatechange = updatePage; xmlHttp.open("GET",url,true); xmlHttp.send(null); } function updatePage() { if(xmlHttp.readyState==4){ var response=xmlHttp.responseText; document.getElementById("zipCode").value = response; } } </script> <form action="zip.PHP" method="GET"> <p>City:<input type="text" name="city" id="city" size="25" onChange="callServer();"/></p> <p>State:<input type="text" name="state" id="state" size="25" onChange="callServer();"/></p> <p>zipCode:<input type="text" name="zipCode" id="zipCode" size="25" /></p> </form> </body> </html>
PHP文件代码：
<?PHP $city=$_GET['city']; $state=$_GET['state']; $output="".$city."".$state; echo $output; ?>
