PHP 和 AJAX MySQL 数据库实例 (总结)

js查询mysql数据库 中间件php

html中加载js代码， 用js打开php文件，调用php查询数据库的数据。（前台页面，可以将html和js放在一个文件里html内写具体js）

01.html

	




 
Select a User:

Peter Griffin
Lois Griffin
Glenn Quagmire
Joseph Swanson




User info will be listed here.

selectuser.js

var xmlHttp

function showUser(str)
{ 
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
 {
 alert ("Browser does not support HTTP Request")
 return
 }
var url="getuser.php"
url=url+"?q="+str
url=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;
}

getuser.php

Firstname
Lastname
Age
Hometown
";

//$row=mysql_fetch_array($result))!==false
//$row = mysql_fetch_array($result)
while($row=mysql_fetch_array($result))
 {
 echo "";
 echo "" . $row['cate_id'] . "";
 echo "" . $row['cate_name'] . "";
 echo "" . $row['parent_id'] . "";
 echo "" . $row['code'] . "";
 echo "";
 }
echo "";

mysql_close($con);
?>