Add event to customer registration success

Question

I have a custom field in customer registration form which I want to add the value of it into a session variable called passcode. So far I have no success, what am I doing wrong?

<input type="text" name="passcode" id="passcode" value="" title="<?php echo $this->__('Passcode') ?>" class="input-text required-entry" />

Here is my observer

public function customerRegisterSuccess(Varien_Event_Observer $observer) {
    $login = Mage::app()->getRequest()->getParams('passcode');
    $session = Mage::getSingleton('customer/session');
    $session->setPasscode($login);
}

Answer 1

you have to pass your field in login array

<input type="text" name="login[passcode]" id="passcode" value="" title="<?php echo $this->__('Passcode') ?>" class="input-text required-entry" />

in your observer

public function customerRegisterSuccess(Varien_Event_Observer $observer) {
    $login = Mage::app()->getRequest()->getPost('login');
    $session = Mage::getSingleton('customer/session');
    $session->setPasscode($login['passcode']);
}

Answer 2

Change getParams() to getParam():

public function customerRegisterSuccess(Varien_Event_Observer $observer) {
    $login = Mage::app()->getRequest()->getParam('passcode');
    $session = Mage::getSingleton('customer/session');
    $session->setPasscode($login);
}

Answer 3

Try this

$postData = Mage::app()->getRequest()->getPost();
print_r($postData['passcode']);

OR

Mage::app()->getFrontController()->getRequest()->getParams();
Mage::app()->getFrontController()->getRequest()->getParam('passcode');