<?php
// Add the new teacher if one is being added //
if($_POST["addteacher"] == 1)
{
if($_POST["username"] != "" && $_POST["fname"] != "" && $_POST["lname"] != "")
{
$query = mysql_query("SELECT userid FROM teachers")
or die("ManageTeachers.php: Uanable to get list of users - ".mysql_error());
// Make sure that the supplied username does not already exist in the database //
while( $userlist = mysql_fetch_row($query) )
{
if($_POST["username"] == $userlist[0])
{
die("<br><br><h1 align='center'><font color='red'>That user is already assigned to a teacher!</font></h1>
<br>
<form name='uhoh' action='./index.php' method='POST'>
<center><input type='button' value=' Back ' onClick='document.uhoh.page2.value=3;document.uhoh.submit();'></center>
<input type='hidden' name='page2' value='$page2'>
<input type='hidden' name='logout'>
<input type='hidden' name='page' value='$page'>
</form>");
}
}
// If all is good, insert the new teacher into the database //
$query = mysql_query("INSERT INTO teachers VALUES('', '$_POST[username]', '$_POST[fname]', '$_POST[lname]')")
or die("ManageTeachers.php: Unable to insert new teacher - " . mysql_error());
}
}
// Edit the teacher if one is being edited //
if($_POST["editteacher"] == 1 && $_POST["fname"] != "" && $_POST["lname"] != "")
{
$query = mysql_query("UPDATE `teachers` SET `userid`='$_POST[username]', `fname`='$_POST[fname]', `lname`='$_POST[lname]' WHERE `teacherid`='$_POST[teacherid]' LIMIT 1")
or die("Manageteachers.php: Unable to update the teacher information - ".mysql_error());
}
// Delete the teacher(s) that the teacher has requested as well as the classes belonging to those teachers //
if($_POST["deleteteacher"] == 1)
{
require_once("DeleteFunctions.php");
$delete = $_POST["delete"];
for($i=0; $i<sizeof($delete); $i++)
{
deleteTeacher($delete[$i]);
}
}
print("<script language='JavaScript'>
// Function to make sure the teacher wants to delete the teacher(s) //
function validate()
{
if( document.teachers.selectteacher.value > 0 )
{
var confirmed = confirm(\"Are you sure you want to delete this teacher?\");
if( confirmed == true )
{
document.teachers.submit();
}
}
else
{
alert('You must select a teacher to delete.');
}
}
// Function to make sure only one checkbox has been selected //
function checkboxes()
{
if( document.teachers.selectteacher.value == 1 )
{
document.teachers.submit();
}
else
{
if( document.teachers.selectteacher.value > 1 )
{
alert('You can only edit one teacher at a time.');
}
else
{
alert('You must select a teacher to edit.');
}
}
}
// Function to keep track of how many checkboxes are checked //
function updateboxes(row)
{
row = row + 2;
if(document.teachers.elements[row].checked)
{
document.teachers.selectteacher.value = Math.round(document.teachers.selectteacher.value) + 1;
}
else
{
document.teachers.selectteacher.value = Math.round(document.teachers.selectteacher.value) - 1;
}
}
</script>
<h1>Manage Teachers</h1>
<br><br>
<table align='center' width='400' cellspacing='0' cellpadding='0' border='0'>
<tr>
<td>
<form name='teachers' action='./index.php' method='POST'>
<input type='button' value='Add' onClick='document.teachers.page2.value=16;document.teachers.submit();'>
<input type='button' value='Edit' onClick='document.teachers.page2.value=17;checkboxes();'>
<input type='button' value='Delete' onClick='document.teachers.deleteteacher.value=1;validate();'>
<br><br>
<table cellspacing='0' width='400' cellpadding='8' class='dynamiclist'>
<tr class='header'>
<td> </td>
<th>First Name</th>
<th>Last Name</th>
<th>Username</th>
</tr>");
// Get the total number of teachers to know how many pages to have //
$query = mysql_query("SELECT COUNT(*) FROM teachers")
or die("ManageTeachers.php: Unable to retrieve total number of teachers - ".mysql_error());
$numrows = mysql_result($query,0);
$numpages = ceil($numrows / 25);
if($_POST["onpage"] == "")
{
$_POST["onpage"]=1;
}
// Get and display the teachers //
$query = mysql_query("SELECT t.teacherid,t.fname,t.lname,u.username FROM teachers t, users u WHERE t.userid = u.userid");
$row = 0;
$actualrow = 0;
while($teacher = mysql_fetch_row($query))
{
$row++;
if($row > ($_POST["onpage"]*25)-25 && $row <= ($_POST["onpage"]*25))
{
$actualrow++;
print("<tr class='".( $row%2==0 ? "even" : "odd" )."'>
<td><input type='checkbox' name='delete[]' value='$teacher[0]' onClick='updateboxes($actualrow);' /></td>
<td>$teacher[1]</td>
<td>$teacher[2]</td>
<td>$teacher[3]</td>
</tr>");
}
}
print(" </table>
<br>
<input type='button' value='Add' onClick='document.teachers.page2.value=16;document.teachers.submit();'>
<input type='button' value='Edit' onClick='document.teachers.page2.value=17;checkboxes();'>
<input type='button' value='Delete' onClick='document.teachers.deleteteacher.value=1;validate();'>
<br><br>
<center>Page: ");
for($i=1; $i<=$numpages; $i++)
{
if($i == $_POST["onpage"])
{
print("<a href='JavaScript: document.teachers.deleteteacher.value=0;document.teachers.page2.value=3;document.teachers.onpage.value=$i;document.teachers.submit();' class='selectedpagenum' onMouseover=\"window.status='Go to page $i';return true;\" onMouseout=\"window.status='';return true;\">$i</a> \n");
}
else
{
print("<a href='JavaScript: document.teachers.deleteteacher.value=0;document.teachers.page2.value=3;document.teachers.onpage.value=$i;document.teachers.submit();' class='pagenum' onMouseover=\"window.status='Go to page $i';return true;\" onMouseout=\"window.status='';return true;\">$i</a> \n");
}
}
print("\n</center>
<input type='hidden' name='deleteteacher'>
<input type='hidden' name='selectteacher'>
<input type='hidden' name='page2' value='$page2'>
<input type='hidden' name='onpage' value='$_POST[onpage]'>
<input type='hidden' name='logout'>
<input type='hidden' name='page' value='$page'>
</form>
</td>
</tr>
</table>
<table width='520' border=0 cellspacing=0 cellpadding=0 height=1>
<tr>
<td valign='top'>
<empty>
</td>
</tr>
</table>
");
?>