这是我的问题：
我有一个显示 X 类的动态列表。选择类时，将显示所有类的所有学生。当用户单击“提交”时，我想向数据库发送插入语句。提交按钮的代码在哪里？
我的尝试：伪代码/结构
放置在网络服务器上 1 个文件夹中的文件：Index.php 和 getStudentList.php
索引.php
<script>
function showStudents(str)
blabla
xmlhttp.open("GET","getStudentList.php?q="+str, true);
xmlhttp.send();
</script>
...
<div>
html display goes here, as well as the form itself
</div>
getStudentList.php
<script>
logic for javascript goes here which connects to a db and inserts attendance info
</script>
<?php
connect to db
query students in class
echo attendance form
?>
详细代码： Index.php
<!--start script for AJAX attendance display-->
<script>
function showStudents(str)
{
if (str=="") {
document.getElementById("attendanceForm").innerHTML="";
return;
}
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("attendanceForm").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","getStudentList.php?q="+str,true);
xmlhttp.send();
}
<script>
<div>
<?php
//identify teacher's classes
$school_connection = New school();
$arrayTeachersClasses = $school_connection->queryTeachersClasses($_SESSION['teacherID']);
//returns array of all classes taught
//echoes today's date
echo Date("l F d, Y");
//create list so teacher can pick class
echo "<form>";
echo "<select name = \"courses\" onchange = \"showStudents(this.value)\">";
echo "<option value=\"\">Select a class:</option>";
$i = 0;//counter
while ($row = $arrayTeachersClasses[$i]) {
echo "<option value=\"". $row[0] . "\">";
echo $row[1] . " ". $row[2] . "-L". $row[3] . " Room " . $row[4];
echo "</option>";
$i++;
}
echo "</select>";
echo "</form>";
/***
//Sample "Select a Class" list
<form>
<select name="users" onchange="function(this.value)">
<option value="">Select a class:</option>
<option value="0">09:00:00 BEG-L1 Room303</option>
<option value="1">TIME SUBJ-LEVEL ROOM</option>
<option value="2">ditto</option>
<option value="3">ditto</option>
</select>
</form>
*/
$teacherID = $_SESSION['teacherID'];
//echo $teacherID;
?>
</div>
<br />
<div id="attendanceForm">
<p><b>Attendance List:</b></p>
Please Select a Class
</div>
getStudentList.php
<script>
//Other JS stuff
$(document).ready(function() {
//if submit button is clicked
$('#submit').click(function () {
$i = 0;//counter
var attendanceData = new Array();
//Get the data for each student
while ($row = $arrayStudentList[$i]) {
var studentID = $('input[name=' . $row[0] . ']');
if (studentID.val()=='') {
studentID.addClass('highlight');
return false;
} else studentID.removeClass('highlight');
$row[2] = studentID.val;
$attendanceData[$i] = $row;
$i++;
}
$row = $attendanceData[0];
$record = $row[2];
alert("My First JavaScript");
//cancel the submit button default behaviours
return false;
});
});
</script>