I want to take attendance of a particular class and store the values in database.
I have used INNER JOIN to get the data from two tables and used those tables values in a form name attendance.
Now once i take attendance using the form i want to store that values in my database so i created another file name insertattendance.php.
The problem is it shows undefined index variables. ex.undefined index classid ..etc
so i tried using it in *if(isset($_POST['submit'])* There is no erros but the values are not posted.
My doubt is since iam using the values of my old tables is it showing error?.
Tell me how can i do this?
attendance.php
<html>
<head>
<title>grade1</title>
</head>
<body>
<table border="1" cellspacing="1" cellpadding="1" width="200" height="200">
<tr>
<th>classid</th>
<th>studentid</th>
<th>teacherid</th>
<th>locid</th>
<th>date</th>
<th>flag</th>
<th>comments</th>
</tr>
<?php
include 'conn.php';
$query = "(SELECT a.classid, a.fname, b.teacherid, c.locid
FROM class_master c JOIN student_master a
ON c.classid = a.classid JOIN teacher_link b
ON c.classid = b.classid
WHERE c.classid = 'grade1' )";
$result = mysql_query($query);
$i=1;
while( $row = mysql_fetch_array($result))
{
echo "<form action=insertattend.php method=POST>";
echo "<tr>";
echo "<td>" . "<input name=classid[$i] type=text value=" .$row['classid']." </td>";
echo "<td>" . "<input name=fname[$i] type=text value=" .$row['fname']." </td>";
echo "<td>" . "<input name=teacherid[$i] type=number value="
.$row['teacherid']." </td>";
echo "<td>" . "<input type=number name=locid[$i] value=" .$row['locid']." </td>";
echo "<td>" . "<input name=date[$i] type=date value='date'></td>";
echo "<td>" . "<input type=radio id=attend name=attend[$i] value='present'>";?>P
<?php echo "<input type=radio id=attend name=attend[$i] value='absent'>";?>A
<?php
echo"</td>";
echo "<td><input name=comment type=comment[$i] row=3 column=5></td>";
echo "</tr>";
$i++;
}
?>
</table>
<input type="submit" value="submit">
</form>
</body>
</html>
Here is my Insertattendance.php code
<?php
if (isset($_POST['submit'])){
include 'conn.php';
$clnm = mysql_real_escape_string($_POST['classid']);
$stfn = mysql_real_escape_string($_POST['fname']);
$dt = mysql_real_escape_string($_POST['date']);
$fg = mysql_real_escape_string($_POST['attend']);
$tid = mysql_real_escape_string($_POST['teacherid']);
$lid = mysql_real_escape_string($_POST['locid']);
$cmt = mysql_real_escape_string($_POST['comment']);
$inquery =("INSERT INTO attendance(classid, studentid, dateid, flag, teacherid,
locid, comments) VALUES('$clnm', '$stfn', '$dt', '$fg', '$tid', '$lid', '$cmt')");
mysql_query($inquery, $dbconnection);
echo "<br>";
echo "values inserted successfully!!!!";
mysql_close($dbconnection);
};
?>
Fix your html code:
<html>
<head>
<title>grade1</title>
</head>
<body>
<table border="1" cellspacing="1" cellpadding="1" width="200" height="200">
<tr>
<th>classid</th>
<th>studentid</th>
<th>teacherid</th>
<th>locid</th>
<th>date</th>
<th>flag</th>
<th>comments</th>
</tr>
<?php
include 'conn.php';
$query = "(SELECT a.classid, a.fname, b.teacherid, c.locid
FROM class_master c JOIN student_master a
ON c.classid = a.classid JOIN teacher_link b
ON c.classid = b.classid
WHERE c.classid = 'grade1' )";
$result = mysql_query($query);
while( $row = mysql_fetch_array($result))
{
echo "<form action='insertattend.php' method='POST'>";
echo "<tr>";
echo "<td>" . "<input name=classid type=text value=" .$row['classid']." ></td>";
echo "<td>" . "<input name=fname type=text value=" .$row['fname']." ></td>";
echo "<td>" . "<input name=teacherid type=number value=" .$row['teacherid']." ></td>";
echo "<td>" . "<input type=number name=locid value=" .$row['locid']." ></td>";
echo "<td>" . "<input name=date type=date value='date'></td>";
echo "<td>" . "<input type=radio id=attend name=attend value='present'>";?>P
<?php echo "<input type=radio id=attend name=attend value='absent'>";?>A
<?php
echo"</td>";
echo "<td><input name=comment type=comment row=3 column=5></td>";
echo "</tr>";
//echo "</form>";
?>
<input type="submit" name="submit" value="submit">
</form>
<?php } ?>
<!--<form action="insertattend.php">-->
</table>
</body>
</html>
These changes ought to be done on your attendance.php code
First move this echo "<form action=insertattend.php method=POST>"; out of your while
Actually you are closing the <form> tag before the submit button.
echo "</tr>";
echo "</form>"; //<--- Comment or Remove this line
Also, remove this line too (because you already defined above the while loop)
<form action="insertattend.php"> <!-- Remove this line -->
<input type="submit" value="submit">
</form>
Another thing is.. echo "<td><input name=comment type=comment row=3 column=5></td>"; I don't think there is something called type=comment replace that to type=text or use a <textarea>
You missed name="submit" in your attendance.php form.
<input type="submit" name="submit" value="submit">
use form opening and closing tags like this:
<html>
<head>
<title>grade1</title>
</head>
<body>
<table border="1" cellspacing="1" cellpadding="1" width="200" height="200">
<tr>
<th>classid</th>
<th>studentid</th>
<th>teacherid</th>
<th>locid</th>
<th>date</th>
<th>flag</th>
<th>comments</th>
</tr>
<?php
include 'conn.php';
$query = "(SELECT a.classid, a.fname, b.teacherid, c.locid
FROM class_master c JOIN student_master a
ON c.classid = a.classid JOIN teacher_link b
ON c.classid = b.classid
WHERE c.classid = 'grade1' )";
$result = mysql_query($query);
?>
<form action=insertattend.php method=POST>
<?php
while ($row = mysql_fetch_array($result)) {
echo "<tr>";
echo "<td>" . "<input name='classid[]' type=text value=" . $row['classid'] . " </td>";
echo "<td>" . "<input name='fname[]' type=text value=" . $row['fname'] . " </td>";
echo "<td>" . "<input name='teacherid[]' type=number value=" . $row['teacherid'] . " </td>";
echo "<td>" . "<input type=number name='locid[]' value=" . $row['locid'] . " </td>";
echo "<td>" . "<input name='date[]' type=date value='date'></td>";
echo "<td>" . "<input type=radio id=attend name='attend[]' value='present'>";
?>P
<?php echo "<input type=radio id=attend name='attend[]' value='absent'>"; ?>A
<?php
echo"</td>";
echo "<td><input name='comment[]' type=comment row=3 column=5></td>";
echo "</tr>";
}
?>
</table>
<input type="submit" name= "submit" value="submit">
</form>
</body>
</html>
You have to post the values as array in form fields inside the loop. Then you have to get the array of post values in foreach to insert all the records to the database.
There are two forms.
Input types are in one form and submit button in another one.So avoid that and put together in one form.There is no need for another form with same action value. There are more than one student so write form outside while loop and then array name for input values. Then in php page values in array so use loop to get all values seperately.
<html>
<head>
<title>grade1</title>
</head>
<body>
<form action=insertattend.php method=POST>
<table border="1" cellspacing="1" cellpadding="1" width="200" height="200">
<tr>
<th>classid</th>
<th>studentid</th>
<th>teacherid</th>
<th>locid</th>
<th>date</th>
<th>flag</th>
<th>comments</th>
</tr>
<?php
include 'conn.php';
$query = "(SELECT a.classid, a.fname, b.teacherid, c.locid
FROM class_master c JOIN student_master a
ON c.classid = a.classid JOIN teacher_link b
ON c.classid = b.classid
WHERE c.classid = 'grade1' )";
$result = mysql_query($query);
$i=1;
while( $row = mysql_fetch_array($result))
{
echo "<tr>";
echo "<td>" . "<input name=classid[] type=text value=" .$row['classid']." </td>";
echo "<td>" . "<input name=fname[] type=text value=" .$row['fname']." </td>";
echo "<td>" . "<input name=teacherid[] type=number value="
.$row['teacherid']." </td>";
echo "<td>" . "<input type=number name=locid[] value=" .$row['locid']." </td>";
echo "<td>" . "<input name=date[] type=date value='date'></td>";
echo "<td>" . "<input type=radio id=attend name=attend[] value='present'>";?>P
<?php echo "<input type=radio id=attend name=attend[] value='absent'>";?>A
<?php
echo"</td>";
echo "<td><input name=comment[] type=text row=3 column=5></td>";
echo "</tr>";
}
?>
</table>
<input type="submit" value="submit">
</form>
</body>
</html>
And in php page you take size of any of the coming array
For eg:sizeof(classid);using that write for loop to accept values
Related
I'm coding an html table that displays information from a MySql table. Each row is a series of input's so the values of the table can be easily updated.
Here's my current code:
<form action=index.php/component/studentmanagement/?task=update method=post>
<table>
<tr>
<th>Name</th>
<th>Email</th>
<th>Program</th>
<th>Class</th>
</tr>
<?php
$db = JFactory::getDBO();
$query = "SELECT * FROM student_management_module";
$db->setQuery($query);
$rows = $db->loadObjectList();
foreach ($rows as &$row) {
echo "<tr>";
echo "<td>" . "<input type=text name=fullName id=name_val value=" .$row->name. "> </td>";
echo "<td>" . "<input type=text name=email id=email_val value=" .$row->email. "> </td>";
echo "<td>" . "<input type=text name=prog id=prog_val value=" .$row->program. "> </td>";
echo "<td>" . "<input type=text name=class id=class_val value=" .$row->class. "> </td>";
echo "<td class = 'headcol'> <input type=submit name=update class='btnupdate' value=update>";
echo "<td>" . "<input type=hidden name=hidden value=" .$row->student_id. "> </td>";
echo "</tr>";
}
?>
</table> </form>
But whenever I try submitting the updated values, they don't get pass to my update functions. Am I putting the table in the form correctly?
Thanks in advance, and I'll appreciate any help.
This is my update function:
<?php
$db = JFactory::getDBO();
$query = "UPDATE student_management_module SET name = '$_POST[fullName]', email = '$_POST[email]', program='$_POST[prog]', class='$_POST[class]' WHERE student_id='$_POST[hidden]'";
$db->setQuery($query);
$db->query();
?>
Try having the value of the name and id in quotes or double quote. I.e., id="class_val". In your case, since you have already inserted the td in a double quote, use single quote. So it will be "<td class='foo' id='foo' name='foo'></td>".
Basically I am not getting any errors when I press update or add. Can anyone help me out? I want it so when I press add it adds that data to the database, and when I press update it updates the database with that value.
<html>
<head>
<title>Subcontractors Data</title>
</head>
<body>
Logout
Homepage
<?php
//make connection
$con = mysqli_connect("localhost","root","");
if(!$con){
die("Can not connect " . mysqli_error());
}
//select db
mysqli_select_db($con , 'subcontractor');
$sql="SELECT * FROM subcontractors";
if(isset($_POST['update'])){
$UpdateQuery = "UPDATE subcontractors SET ID='$_POST[ID]', Name='$_POST[Name]', Surname='$_POST[Surname]', FPA='$_POST[FPA]', Performance='$_POST[Performance]' WHERE ID='$_POST[hidden]'";
mysqli_query($con, $UpdateQuery);
};
if(isset($_POST['add'])){
$AddQuery = "INSERT INTO subcontractors (ID, Name, Surname, FPA, Performance) VALUES ('$_POST[aID]','$_POST[aName]','$_POST[aSurname]','$_POST[aFPA]','$_POST[aPerformance]')";
mysqli_query($con, $AddQuery);
};
$my_Data=mysqli_query($con,$sql);
echo "<table border=1>";
echo"<tr>";
echo"<th>ID</th>";
echo"<th>Name</th>";
echo"<th>Surname</th>";
echo"<th>FPA</th>";
echo "<th>Performance</th>";
echo "</tr>";
while($record=mysqli_fetch_assoc($my_Data)){
echo "<form action=editsub.php method=post>";
echo "<tr>";
echo "<td>" . "<input type=text name='ID' value=".$record['ID'] ." </td>";
echo "<td>" . "<input type=text name='Name' value=".$record['Name'] . " </td>";
echo "<td>" . "<input type=text name='Surname' value=".$record['Surname'] . " </td>";
echo "<td>" . "<input type=text name='FPA' value=".$record['FPA'] . "% </td>";
echo "<td>" . "<input type=text name='Performance' value=".$record['Performance'] . "% </td>";
echo "<input type=hidden name='hidden' value=" . $record['ID'] . ">";
echo "<input type=submit name='update' value='update'>";
echo "</tr>";
echo "</form>";
}
echo "<form action=editsub.php mehtod=post>";
echo "<tr>";
echo "<td><input type=text name='aID'></td>";
echo "<td><input type=text name='aName'></td>";
echo "<td><input type=text name='aSurname'></td>";
echo "<td><input type=text name='aFPA'></td>";
echo "<td><input type=text name='aPerformance'></td>";
echo "<td>" . "<input type=submit name='add' value='add'" . " </td>";
echo "</form>";
echo "</table>";
mysqli_close($con);
?>
</body>
</html>
This way you can check error.
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);
I decided to make my database with an active hyperlink so when I find a record I click on an email address and and email is opened. BUT I have a problem with update, When I want to make a correction to the entry and when I press update the email disappears and I get:
Notice: Undefined index: Mail in /Applications/XAMPP/xamppfiles/htdocs/robocze/mydata_dodaj_test_1.php on line 36
I can add records but I can't update...
Can You please help me, thank You
the code:
<?php
session_start();
if(!isset($_SESSION["sess_user"])){
header("location:login.php");
} else {
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Baza Klientów</title>
</head>
<body>
<h3>Welcome, <?=$_SESSION['sess_user'];?>! Logout </h3>
<input type="button" onclick="location.href='mydata_dodaj_test_1.php';" value="Powrót do wyszukiwania" />
<input type="button" onclick="location.href='index.php';" value="MENU powrót" />
<h2><b><center>Wyszukiwanie Klientów ITalents</center></b></h2>
<?php
}
?>
<?php
$con = mysql_connect("","","","");
if (!$con){
die("Błąd połączenia: " . mysql_error());
}
mysql_select_db("baza",$con);
if(isset($_POST['update'])) {
$UpdateQuery = "UPDATE Klienci SET id='$_POST[id]', Firma='$_POST[Firma]', Mail='$_POST[Mail]', Data='$_POST[Data]', Konsultant='$_POST[Konsultant]' WHERE id='$_POST[hidden]'";
mysql_query($UpdateQuery,$con);
};
if(isset($_POST['add'])) {
$AddQuery = "INSERT INTO Klienci (id, Firma, Mail, Data, Konsultant) VALUES ('$_POST[uid]','$_POST[uFirma]','$_POST[uMail]','$_POST[uData]','$_POST[uKonsultant]')"; // this is the 36 line
mysql_query($AddQuery,$con);
};
if(isset($_POST['search']))
{
$valueToSearch = $_POST['valueToSearch'];
$query = "SELECT * FROM Klienci WHERE CONCAT(Firma, Mail, Konsultant) LIKE '%".$valueToSearch."%'";
$search_result = filterTable($query);
}
else {
$query = "SELECT * FROM Klienci ORDER BY id ASC";
$search_result = filterTable($query);
}
function filterTable($query)
{
$con = mysql_connect("","","","");
if (!$con){
die("Błąd połączenia: " . mysql_error());
}
mysql_select_db("baza",$con);
$filter_Result = mysql_query($query, $con);
return $filter_Result;
};
echo "<form action=mydata_dodaj_test_1.php method=post>";
echo "<input type=text name=valueToSearch placeholder=wpisz>";
echo "<input type=submit name=search value=Szukaj>";
echo "<table align=center style=text-align:center border=5>
<tr>
<th>ID</th>
<th>Firma</th>
<th>Mail</th>
<th>Data</th>
<th>Konsultant</th>
</tr>";
while($row = mysql_fetch_array($search_result)) {
echo "<form action=mydata_dodaj_test_1.php method=post>";
echo "<tr>";
echo "<td>" . "<input type=int name=id value=" . $row['id'] . " </td>";
echo "<td>" . "<input type=varchar name=Firma value=" . $row['Firma'] . " </td>";
echo "<td>" . "<a href='mailto:{$row['Mail']}'>" . $row['Mail'] . " </td>";
echo "<td>" . "<input type=date name=Data value=" . $row['Data'] . " </td>";
echo "<td>" . "<input type=varchar name=Konsultant value=" . $row['Konsultant'] . " </td>";
echo "<td>" . "<input type=hidden name=hidden value=" . $row['id'] . " </td>";
echo "<td>" . "<input type=submit name=update value=update" . " </td>";
echo "</form>";
}
echo "<form action=mydata_dodaj_test_1.php method=post>";
echo "<tr>";
echo "<td><input type=text name=uid></td>";
echo "<td><input type=varchar name=uFirma></td>";
echo "<td><input type=text name=uMail></td>";
echo "<td><input type=text name=uData></td>";
echo "<td><input type=text name=uKonsultant></td>";
echo "<td>" . "<input type=submit name=add value=dodaj" . " </td>";
echo "</form>";
echo "</table>";
?>
<input type="button" onclick="location.href='mydata_dodaj_test_1.php';" value="Powrót do wyszukiwania" />
<input type="button" onclick="location.href='index.php';" value="MENU powrót" />
</body>
</html>
As error stated undefined index in your update statement
$UpdateQuery = "UPDATE Klienci SET id='$_POST[id]', Firma='$_POST[Firma]', Mail='$_POST[Mail]', Data='$_POST[Data]', Konsultant='$_POST[Konsultant]' WHERE id='$_POST[hidden]'";
you are accessing $_POST[Mail] which is no where in your form.
This question already has answers here:
Why would $_FILES be empty when uploading files to PHP?
(22 answers)
Closed 8 years ago.
I am trying to build a file uploader, with a youtube tutorial that doesn't cover files, and right now I am stuck on the name. Using $_Files returns nothing and I am unsure as to why. :/
I tried to echo it out, but nothing comes back.
Everything else seems to work though.
<html>
<head>
</head>
<body>
<?php
error_reporting(-1);
ini_set('display_errors', 'On');
$con = mysql_connect("localhost","root","root");
if (!$con){
die("Can not connect: " . mysql_error());
}
mysql_select_db("example",$con);
if(isset($_POST['update'])){
$UpdateQuery = "UPDATE repo SET location='$_POST[location]', name='$_POST[name]', description='$_POST[description]' WHERE location='$_POST[hidden]'";
mysql_query($UpdateQuery, $con);
};
if(isset($_POST['delete'])){
$DeleteQuery = "DELETE FROM repo WHERE location='$_POST[hidden]'";
mysql_query($DeleteQuery, $con);
};
if(isset($_POST['add'])){
$AddQuery = "INSERT INTO repo (name, id, image, location, partners, description, date) VALUES ('$image_name', '','$_POST[uimage]', '$_POST[ulocation]', '$_POST[upartners]', '$_POST[udescription]', NOW())";
mysql_query($AddQuery, $con);
};
$sql = "SELECT * FROM repo";
$myData = mysql_query($sql,$con);
echo "<table border=1>
<tr>
<th>Image</th>
<th>Name</th>
<th>Location</th>
<th>Partners</th>
<th>Description</th>
<th>Date</th>
</tr>";
while($record = mysql_fetch_array($myData)){
?>
<form action="mydata5.php"
method="post" enctype="multipart/form-data">
<?php
echo "<tr>";
echo "<td>" . "<img src=Assets/Images/" . $record['name'] . " </td>";
echo "<td>" . "<input type=text name=topic value=" . $record['name'] . " </td>";
echo "<td>" . "<input type=text name=name value=" . $record['location'] . " </td>";
echo "<td>" . "<input type=text name=name value=" . $record['partners'] . " </td>";
echo "<td>" . "<input type=text name=description value=" . $record['description'] . " </td>";
echo "<td>" . "<input type=text name=description value=" . $record['date'] . " </td>";
echo "<td>" . "<input type=hidden name=hidden value=" . $record['location'] . " </td>";
echo "<td>" . "<input type=submit name=update value=update" . " </td>";
echo "<td>" . "<input type=submit name=delete value=delete" . " </td>";
echo "</tr>";
echo "</form>";
}
echo "<form action=mydata5.php method=post>";
echo "<tr>";
// echo "<td><input type=file name=uimage></td>";
?>
<td><input type="file" name="uimage" id="uimage"></td>
<?php
$file = $_FILES['uimage']['tmp_name'];
$image_name = mysql_real_escape_string($_FILES['uimage']['name']);
echo $_FILES['uimage']['error'];
echo "<td><input type=hidden name=uname></td>";
echo "<td><input type=text name=ulocation></td>";
echo "<td><input type=text name=upartners></td>";
echo "<td><input type=text name=udescription></td>";
echo "<td>" . "<input type=submit name=add value=add" . " </td>";
echo "</form>";
echo "</table>";
mysql_close($con);
?>
</body>
</html>
You need to add enctype="multipart/form-data" in the form tag.
For file type fields you need to add enctype attribute in your form so that uploaded files can be access using $_FILES
Update form starting tag with below
<form action="mydata5.php"
method="post" enctype="multipart/form-data">
Check your Insert Query.You are using $_POST for image name. That is wrong.
I'm trying to create a dropdown list with the values being populated from the database. In the following code, I have created a table for viewing the student details and created delete and add buttons to add and delete the information.
The problem is while adding the details for class id, I used a dropdown value from another table to be populate the values, but I was not able to do it.
<html>
<head><title>viewstudent</title>
<?php
$host = "localhost";
$user = "root";
$pass = "";
$dbname = "my_attendance";
$prefix = "";
$con = mysql_connect($host, $user, $pass)
or die ("not connected to db");
mysql_select_db($dbname, $con)
or die("database not selected");
if (isset($_POST['delete'])){
$deleteqry = "DELETE from student_master WHERE ID='$_POST[hidden]'" ;
mysql_query($deleteqry, $con);
};
if (isset($_POST['add'])){
$clid=mysql_real_escape_string($_POST['classid']);
$sid=mysql_real_escape_string($_POST['studentid']);
$fn=mysql_real_escape_string($_POST['fname']);
$ln=mysql_real_escape_string($_POST['lname']);
$dob=mysql_real_escape_string($_POST['dob']);
$em=mysql_real_escape_string($_POST['email']);
$ph=mysql_real_escape_string($_POST['phone']);
$loc=mysql_real_escape_string($_POST['locationid']);
$emer=mysql_real_escape_string($_POST['emergency']);
$addquery = ("INSERT INTO student_master(classid, studentid, fname, lname, dob, phone, email, locationid, emergency)
VALUES('$clid', '$sid', '$fn', '$ln', '$dob', '$ph', '$em', '$loc', '$emer')");
mysql_query($addquery, $con);
};
$query=("SELECT * FROM student_master");
$result = mysql_query($query);
?>
</head>
<body>
<table align="center" width="500" border="1" cellspacing="1" cellpadding="1">
<tr>
<th>Id</th><th>classid</th><th>studentid</th><th>fname</th><th>lname</th><th>dob</th><th>phone</th><th>email</th><th>locationid</th><th>emergency</th>
</tr>
<?php
while( $row = mysql_fetch_array($result,MYSQLI_ASSOC))
{
echo "<form action=viewstudentinfo.php method=POST >";
echo "<tr align='center'>";
echo "<td>" . "<input type=text name=ids value=" .$row['id']." </td>";
echo "<td>" . "<input type=text name=classid value=" .$row['classid']." </td>";
echo "<td>" . "<input type=number name=studentid value=" .$row['studentid']." </td>";
echo "<td>" . "<input type=text name=fname value=" .$row['fname']." </td>";
echo "<td>" . "<input type=text name=lname value=" .$row['lname']." </td>";
echo "<td>" . "<input type=text name=dob value=" .$row['dob']." </td>";
echo "<td>" . "<input type=text name=phone value=" .$row['phone']." </td>";
echo "<td>" . "<input type=text name=email value=" .$row['email']." </td>";
echo "<td>" . "<input type=text name=locationid value=" .$row['locationid']." </td>";
echo "<td>" . "<input type=text name=emergency value=" .$row['emergency']." </td>";
echo "<td>" . "<input type=hidden name=hidden value=" .$row['id']." </td>";
echo "<td>" . "<input type=submit name=delete value=Delete" ." </td>";
echo "</tr>";
echo "</form>";
}
echo "<form action=viewstudentinfo.php method= post>";
echo "<tr>";
echo "<td><input type=text name=id></td>";
echo "<td><select type=text name=classid></td>";?>
// populating classid values from another table....
<?php
$query = 'SELECT classid FROM class_master';
$result1 = mysql_query($query, $con) or die(mysql_error($con));
while ($row = mysql_fetch_array($result1))
{
echo '<option value="' . $row["classid"] . '"> ' . $row["classid"] . '</option>';
}
echo "</select>";
?>
<?php
echo "<td><input type=number name=studentid></td>";
echo "<td><input type=text name=fname></td>";
echo "<td><input type=text name=lname></td>";
echo "<td><input type=date name=dob></td>";
echo "<td><input type=number name=phone></td>";
echo "<td><input type=email name=email></td>";
echo "<td><input type=number name=locationid></td>";
echo "<td><input type=number name=emergency></td>";
echo "<td>" . "<input type=submit name=add value=ADD" ." </td>";
echo "</tr>";
echo "</form>";
echo "</table>";
mysql_close($con);
?>
You are closing the <td> inside the select:
Replace
echo "<td><select type=text name=classid></td>";?>
With
echo "<td><select type=text name=classid>";?>
And close the '</td>' after the '</select>'
Find out <td><select type=text name=classid></td> in your code and remove the ending tag </td> from it. After all the <option> ... </option> close the </td>