我的应用程序要求用户从下拉列表中选择日期。选择日期后，它将显示在该日期参加考试的学生列表。然后，用户可以编码等级然后保存。但是节省部分不起作用。
这是代码。
$queryselect = mysql_query("SELECT examdateno, examdate from tbl_examdate ORDER BY examdate DESC");
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>SPORT Qualifying Exam System</title>
<link rel="stylesheet" type="text/css" href="../css/style.css">
<link rel="stylesheet" type="text/css" href="../css/component.css" />
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<link rel="stylesheet" href="//code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css">
<script src="//code.jquery.com/jquery-1.10.2.js"></script>
<script>
function showUser(str) {
if (str == "") {
document.getElementById("txtHint").innerHTML = "";
return;
} else {
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
} else {
// code for IE6, IE5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function () {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
document.getElementById("txtHint").innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open("GET", "encodeinterviewajax.php?q=" + str, true);
xmlhttp.send();
}
}
</script>
</head>
<body>
<body>
<header>
<img src="../images/qes_logob.png" alt="logo">
<button class="hamburger">☰</button>
<button class="cross">˟</button>
</header>
<div class="menu">
<ul>
<a href="encodeinterview.php">
<li>Encode Grades</li>
</a>
<a href="viewinterview.php">
<li>View Grades</li>
</a>
<a href="../index.php">
<li>Logout</li>
</a>
</ul>
</div>
<script>
$(".cross").hide();
$(".menu").hide();
$(".hamburger").click(function () {
$(".menu").slideToggle("slow", function () {
$(".hamburger").hide();
$(".cross").show();
});
});
$(".cross").click(function () {
$(".menu").slideToggle("slow", function () {
$(".cross").hide();
$(".hamburger").show();
});
});
</script>
<div id="content">
<form>
<h1>Exam Dates</>
<select name="examdate" id="examDate" onchange="showUser(this.value)">
<option>Select Exam Date</option>
<?php
while ($row = mysql_fetch_array($queryselect)) {
echo "<option value={$row['examdateno']}>{$row['examdate']}</option>\n";
}
?>
</select>
</form>
</div>
<div id="txtHint">Examinees will be listed here</div>
</body>
</html>
这是php文件
<?php
include '../configuration.php';
?>
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css" href="../css/component.css" />
<link rel="stylesheet" type="text/css" href="../css/style.css">
<link rel="stylesheet" type="text/css" href="../css/grid.css">
</head>
<body>
<?php
$q = intval($_GET['q']);
$sql = mysql_query("select s.sno, s.fname, s.lname, s.examdate, s.interviewgrade, s.gwa from student s inner join tbl_examdate e on s.examdate=e.examdate where e.examdateno=$q");
?>
<div class="as_wrapper">
<div class="as_grid_container">
<div class="as_gridder" id="as_gridder"></div> <!-- GRID LOADER -->
<form method="post" action="">
<table class="as_gridder_table">
<tr class="grid_header">
<td><div class="grid_heading">Student No.</div></td>
<td><div class="grid_heading">First Name</div></td>
<td><div class="grid_heading">Last Name</div></td>
<td><div class="grid_heading">Exam Date</div></td>
<td><div class="grid_heading">Interview Grade</div></td>
<td><div class="grid_heading">GWA</div></td>
</tr>
<?php
while ($row = mysql_fetch_array($sql)) {
?>
<tr class="<?php
$i+=1;
if ($i % 2 == 0) {
echo 'even';
} else {
echo 'odd';
}
?>">
<td><?php $sno[]=$row['sno'];echo $row['sno']; ?></td>
<td><?php $fname[]=$row['fname']; echo $row['fname']; ?></td>
<td><?php $lname[]=$row['lname'];echo $row['lname']; ?></td>
<td><?php echo $row['examdate']; ?></td>
<td><input type="text" size="3" maxlength="3" name="interview[]"></td>
<td><input type="text" size="3" maxlength="3" name="gwa[]"></td>
</tr>
<?php
}
?>
<tr>
<td colspan="6"><button id="btnUpdate">Save</button>
</tr>
</table>
</form>
<?php
if (isset($_POST['btnUpdate'])){
for($i=0;$i<sizeof($sno);$i++){
$interview = $_POST['interview'][$i];
$gwa = $_POST['gwa'][$i];
$sql1= mysql_query("UPDATE student SET gwa='$gwa', interviewgrade='$interview' where fname='$fname[$i]' AND lname='$lname[$i]' ");
header('Location: encodeinterview.php');
}
}
?>
</div>
</div>
</body>
</html>