Ajax如何调用后台php代码访问数据库
Ajax如何调用数据库，这里我用的JS代码是function check{
var xmlHttp
function showUser(str)
{
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
{
alert ("Browser does not support HTTP Request")
return
}
var url="getuser.php" //getuser.php是我的PHP文件，功能是链接数据库并且访问
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;
}
}
php代码是：<?php
//连接数据库的函数
$con = mysql_connect('localhost', 'root', '123');
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db("storage", $con);
$sql="SELECT * FROM user_main";
$result = mysql_query($sql);
echo "<table border='1'>
<tr>
<th>Firstname</th>
<th>Lastname</th>
<th>Age</th>
<th>Hometown</th>
</tr>";
while($row = mysql_fetch_array($result))
{
echo "<tr>";
echo "<td>" . $row['user_id'] . "</td>";
echo "<td>" . $row['user_name'] . "</td>";
echo "<td>" . $row['password'] . "</td>";
echo "<td>" . $row['text'] . "</td>";
echo "</tr>";
}
echo "</table>";
mysql_close($con);
?>
html代码是：<html>
<head>
<script src="selectuser.js"></script>
</head>
<body>
<form method="post" onSubmit="return showUser();">
Select a User:
<input type="submit" name="users" value="提交" >
</form>
<p>
<div><b>User info will be listed here.</b></div>
</p>
</body>
</html>
求各位大侠指教
[解决办法]
你的代码写的真让人蛋疼，重写吧，逻辑有些混乱
[解决办法]
要自己去下载两个文件
a.js
function load() { document.getElementById("load").display="none"; } var t = "bb"; $.ajax({ url: "a.php",//获取数据文件路径 type: "post", //提交方式 data:"selectID="+ escape(t) +"", //传递参数 success: function(data,textStatus){ if(data==""){ $('#dv').css('background', '#ffffff').html("暂无数据").show(); }else { $('#dv').css('background', '#ffffff').html(data).show();}//显示区域,隐藏其它 $("#dv").html(data); }, error: function(o){}});