ajax与PHP示例

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PHP代码

<html><head><script src="clienthint.js"></script> </head><body><form> First Name:<input type="text" id="txt1"onkeyup="showHint(this.value)"></form><p>Suggestions: <span id="txtHint"></span></p></body></html>

clinenthint代码

var xmlHttpfunction showHint(str){if (str.length==0)  {   document.getElementById("txtHint").innerHTML=""  return  }xmlHttp=GetXmlHttpObject()if (xmlHttp==null)  {  alert ("Browser does not support HTTP Request")  return  } var url="gethint.php"url=url+"?q="+strurl=url+"&sid="+Math.random()xmlHttp.onreadystatechange=stateChanged xmlHttp.open("GET",url,true)xmlHttp.send(null)} function stateChanged() { if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete") {  document.getElementById("txtHint").innerHTML=xmlHttp.responseText  } }function GetXmlHttpObject(){var xmlHttp=null;try { // Firefox, Opera 8.0+, Safari xmlHttp=new XMLHttpRequest(); }catch (e) { // Internet Explorer try  {  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");  } catch (e)  {  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");  } }return xmlHttp;}

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