Iframe with a submit form in a Fancybox not posting data - php

Question

I'm trying to submit a form inside a fancybox. It is a simple contact us form with name and email and a submit button.
I set the fancybox to iframe and it loads "download.php". This is what "download.php" has:
<form action="sendmail.php" type="post">
<fieldset style="width: 300px;">
<legend>Please fill out completely:</legend>
<span style="color: red;">* required field</span>
<br>
<label for="txtName">Name:</label><br>
<input type="text" id="txtName" style="width: 200px;" name="txtName"><span id="lblName" style="color: red;">*</span><br>
<label for="txtEmail">Email:</label><br>
<input type="text" id="txtEmail" style="width: 200px;" name="txtEmail"><span style="color: red;">*</span><br><br>
<button id="btnSubmit">Submit</button>
<input type="text" id="txtH" style="display: none;" name="txtH">
</fieldset>
</form>
When it submits it works properly other than "txtName" and "txtEmail" being blank. I can't seem to get the values to send. It sends an email after submitting properly otherwise which is why I need to use PHP and not jQuery. Thanks for any help!
Here is the sendmail.php code.
ini_set('SMTP','mail.######.com' );
ini_set('smtp_port', '25');
ini_set('sendmail_from', 'info######.com');
$name = $_POST["txtName"];
$email = $_POST["txtEmail"];
$url = "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
$msgBody = 'The following information was submitted via the download form.' . PHP_EOL . PHP_EOL .
'Name: ' . $name . PHP_EOL .
'Email: ' . $email . PHP_EOL .
'URL: ' . $url . PHP_EOL;
$to = "me#me.com";
$subject = "A White Paper was downloaded";
$headers = "From: info#me.com" . "\r\n";
if (mail($to, $subject, $msgBody, $headers)) {
header('Location: download-success.php');
}
else {
header('Location: same.php');
}
}

Answer 1

You have a mistake here,
<form action="sendmail.php" type="post">
it should be method="post" not type="post"
<form action="sendmail.php" method="post">
and also in your submit button, add type="submit"
<button id="btnSubmit" type="submit">Submit</button>
and here you don't need to set display:none; you can use type="hidden" if you want to hide the input
<input type="hidden" id="txtH" name="txtH">
and In your PHP, use isset
if (isset($_POST['txtName']) {
$name = $_POST["txtName"];
//and rest of the code goes here
}
And always
Add error reporting to the top of PHP file which will help find errors.
error_reporting(E_ALL); //Error reporting enable
ini_set('display_errors',1);