Submit returning a blank page - php

Question

A blank page is returned when I try to add a new note. My code is in php and the DB is mysql
This is the php code:
if (isset($_POST['Submit'])) {
$candidate_id = $_POST['candidate_id'];
$Notes = $_POST['notes'];
if ($Notes != "") {
$sql3 = "INSERT INTO notes (notes_id, candidate_id, notes) VALUES(DEFAULT,'$candidate_id','$Notes')";
$result3=mysql_query($sql3);
if (!$result3) {
die('Error: ' . mysql_error());
}
echo "</br>1 note added"
}
}
mysql_close();
The code for the form
<div id="tab3">
<h2> Notes </h2>
<dl>
<dt>Notes</dt>
<dd>
<textarea id="notes" style="width: 80%; height: 150px;" name="notes"></textarea>
</dd>
</dl>
<?php
echo "";
?>
</div>

Answer 1

try
if($_SERVER['REQUEST_METHOD']=="POST"){
or
if(isset($_POST['update'])){
instead of
if (isset($_POST['Submit'])) {
the name of the submit button is update not Submit on your form
also stop using mysql_* functions. If you have to use them for now, at least escape the inputs properly before inserting them to database.

Answer 2

To sum this up:
use error reporting in the beginning of your script
error_reporting(E_ALL);
Echo out the SQL query (after you created it) to see what weird, unescaped stuff you want to send to the server:
echo $sql3;
exit; // to prevent execution
Try the echoed SQL with phpmyadmin to see if the problem is your query or the missing database connection.
There are a lot more bad things in your script, but for first error-tracing those tips might be okay... In general, i recommend you to completely rewrite this after you read into SQL injection, modern database query methods, proper php coding etc. ! To finish your project, you should consider using a micro framework to get quick and secure results.

Answer 3

in your submit button you have no form
try this
<div id ="tab3">
<h2> Notes </h2>
<dl><dt>Notes</dt><dd><form action="" method="post" name="myform"><textarea id="notes" style="width: 80%; height: 150px;" name="notes"></textarea></dd></dl>
<?php echo "</form>";
?> </div>
and please avoid using inner css , please use classes in other css file.

Answer 4

Try This
<?php
if(isset($_POST['submit'])){
// Code
<?php
}
else
{
echo "form not submited properly";
}
?>
<?php
include 'header.php';
include 'nav.php';
include 'config.php';
?>
Except
<?php
include 'header.php';
include 'nav.php';
include 'config.php';
?>
<?php
if(isset($_POST['submit'])){
// Code
<?php
}
else
{
echo "form not submited properly";
}
?>