我想从droptown选择Class时从数据库中获取学生详细信息。每个记录都应该有一个动态文本框，用于分配卷号。为此，我使用的是Ajax，它工作正常。 PHP代码和HTML代码如下所示
<?php
$cls=$_GET['hhcls'];
$r11=$_GET['srno'];
if($r11=='')
{
$r11=1;
}
$conn=mysql_connect("localhost","root","");
mysql_select_db("school",$conn);
$query=mysql_query("select * from stu_class where class='$cls'",$conn);
echo "<table cellpadding=5 cellspacing=1 width='100%'>";
echo "<tr align=center class='menu' bgcolor=#F5F5F5><td>Registration No. </td><td>Student Name</td><td>Roll No.</td></tr>";
while($data=mysql_fetch_row($query))
{
echo "<tr>";
echo "<td align=center>$data[0]</td>";
echo "<td align=center>$data[1]</td>";
echo "<td align=center><input type='text' name=$data[0] id=$data[0] value=$r11></td>";
echo "</tr>";
$r11=$r11+1;
}
echo "</table>";
?>
HTML代码如下所示
<!DOCTYPE html>
<!--[if lt IE 7]> <html class="lt-ie9 lt-ie8 lt-ie7" lang="en"> <![endif]-->
<!--[if IE 7]> <html class="lt-ie9 lt-ie8" lang="en"> <![endif]-->
<!--[if IE 8]> <html class="lt-ie9" lang="en"> <![endif]-->
<!--[if gt IE 8]><!--> <html lang="en"> <!--<![endif]-->
<?php
session_start();
if(($_SESSION["adm"])=='0')
{
echo "<script type='text/javascript'>alert('You are not Authenticate for this Module');</script>";
print('<script>window.location.href="main.php"</script>');
}
else
{
$sn=$_SESSION["sname"];
}
?>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>OSMS-Staff Hirement</title>
<link rel="stylesheet" href="css/styles.css">
<link rel="STYLESHEET" type="text/css" href="style/fg_membersite.css" />
<link rel="STYLESHEET" type="text/css" href="style/pwdwidget.css" />
<!--[if lt IE 9]><script src="//html5shim.googlecode.com/svn/trunk/html5.js"></script><![endif]-->
</head>
<body>
<?php
$host="localhost";
$dbusername="root";
$dbpassword="";
$dbname="school";
$conn=mysql_connect($host,$dbusername,$dbpassword) or die(mysql_error());
mysql_select_db($dbname) or die(mysql_error());
if(isset($_POST['submit']))
{
$cls=$_POST['hhcls'];
{
{
{
$query=mysql_query("select * from stu_class where class='$cls'",$conn);
while($data=mysql_fetch_array($query))
{
//$r1=$data[0];
//$r=$_POST[$r1];
//echo $r;
$query1="update stu_class set rollno='" . $_POST[$data[0]] . "' where ad_no='" . $_POST[$data[0]];
$sql_query1=mysql_query($query1) or die(mysql_error());
if($sql_query1)
{
echo "<script type='text/javascript'>alert('Students Details Updated Successfully');</script>";
}
else
{
echo "<script type='text/javascript'>alert('Updation Failed');</script>";
}
}
}
}
}
}
?>
<script type="text/javascript">
function gen()
{
var e = document.getElementById("category_gen");
var gene = e.options[e.selectedIndex].value;
document.getElementById("hgen").value=gene;
}
</script>
<script type="text/javascript">
function bgg()
{
var e = document.getElementById("category_bld");
var gen = e.options[e.selectedIndex].value;
document.getElementById("hbg").value=gen;
}
</script>
<script type="text/javascript">
function natt()
{
var e = document.getElementById("category_nat");
var gen = e.options[e.selectedIndex].value;
document.getElementById("hnat").value=gen;
}
</script>
<script type="text/javascript">
function rell()
{
var e = document.getElementById("category_rel");
var gen = e.options[e.selectedIndex].value;
document.getElementById("hreli").value=gen;
}
</script>
<script type="text/javascript">
function commm()
{
var e = document.getElementById("category_comm");
var gen = e.options[e.selectedIndex].value;
document.getElementById("hcomm").value=gen;
}
</script>
<script type="text/javascript">
function clss()
{
var e = document.getElementById("category_cls");
var gen = e.options[e.selectedIndex].value;
document.getElementById("hcls").value=gen;
var gen1=e.options[e.selectedIndex].text;
document.getElementById("hhcls").value=gen1;
post1();
}
</script>
<script type="text/javascript">
function post1()
{
var d=document.getElementById("hhcls").value;
var d1=document.getElementById("srno").value;
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (xhttp.readyState == 4 && xhttp.status == 200) {
document.getElementById("responsecontainer").innerHTML = xhttp.responseText;
}
};
xhttp.open("POST", "rollassign.php?hhcls="+d+"&srno="+d1, true);
xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhttp.send();
}
</script>
<?php include('/menu.php');?>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td><table width="100%" border="0" style="background:#FFFFFF;" cellspacing="0" cellpadding="0">
<tr>
<td align="center"><table width="100%" border="0" cellspacing="0" cellpadding="0" bgcolor="#FFFFFF">
<tr>
<!-- Start : Site Menu -->
<!-- End : Site Menu -->
<!-- Start : Table Of Contents -->
<td valign="top" class="bodytext">
<table cellpadding="0" cellspacing="0" border="0" width="99%" align="left">
<tr>
<td>
<table cellspacing="2" border="0" width="100%" cellpadding="5" style="border:1px solid #E5E5E5; background:#F8F8F8;">
<tr>
<td width="20%">
<form method='POST' action="<?php echo $_SERVER['PHP_SELF']; ?>">
</td>
<input name="hnat" type="hidden" id="hnat" value="0" />
<input name="hreli" type="hidden" id="hreli" value="0" />
<input name="hcomm" type="hidden" id="hcomm" value="0" />
<input name="hcls" type="hidden" id="hcls" value="0" />
<input name="hhcls" type="hidden" id="hhcls" value="0" />
<td>Select Category</td>
<td><select name="category_cls" id="category_cls" class="frmselect" style="width:220px;" onChange="clss();">
<option value="0">-- Select Class--</option>
<option value="1">LKG</option>
<option value="2">UKG</option>
<option value="3">I</option>
<option value="4">II</option>
<option value="5">III</option>
<option value="6">IV</option>
<option value="7">V</option>
<option value="8">VI</option>
<option value="9">VII</option>
<option value="10">VIII</option>
</select>
</td>
<td >Starting Roll No.<input type="text" id="srno" onBlur="post1();" name="srno" value=""></td>
</tr>
</table>
</td>
</tr>
<tr>
<td> </td>
</tr>
<tr>
<td><img src="images/spacer.gif" width="1" height="5"></td>
</tr>
<tr><td align="center" valign="top">
<div id="responsecontainer">
</div>
</td></tr>
<tr>
<td><table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="75%"></td>
<td width="25%" align="right">
<INPUT class="btnform" type="submit" id="submit" name="submit" value="SAVE">
<input type="hidden" name="txtHid" value="<?php echo $_REQUEST['product_id'];?>"></td>
</tr>
</table></td>
</tr>
</form>
<tr>
<td> </td>
</tr>
</table>
</td>
<!-- Start : Table Of Contents -->
</tr>
</table></td>
</tr>
</table></td>
</tr>
<!-- Footer -->
<!-- Footer -->
</table>
</body>
</html>
我面临的问题是在分配动态文本框后更新数据库时，它会抛出php错误undefined Offset：1 请帮我。 我需要指导 1.想要在选择下拉列表时为每条记录创建动态文本框 2.我想在数据库中的动态文本框中发布数据
谢谢