Custom Login module creation in Magento

Magento is an open source ecommerce solution. Magento module development have a certain standard procedures. Let us look in to the new custom module creation.
Create one folder local inside app/code/. This local folder is used for our custom module creation. This folder will not affect any upgrade of magento in future if any.
/app/code   |- /core/   |- /community/   |- /local/
Inside this local folder create another folder called as Name Space(Test), inside that folder create another folder, it is usually called as modulename(Mymodule).
App/code/local/Test/Mymodule.
app/code/local/Test/Mymodule/
here Test is our Name Space and Mymodule is our modulename.
 



How to activate the module?
Create a file Test_Mymodule.xml in app/etc/modules/, this will tell Magento to look for and use our custom module.

           true
           local

create config.xml file in app/code/local/Test/Mymodule/etc

            0.1.0
     
        
            
                
                standard
                
                    
                    Test_Mymodule
                    
                    mymodule
                    mymodule.xml
Then create a controller file called as IndexController.php in app/code/local/Test/Mymodule/controllers

inside that file write our indexaction

public function indexAction()
    {
     $this->loadLayout();
     $this->renderLayout();
    }

this will load the layout and render the view file
Create login Action function

public function loginAction()
    {
    	$session = Mage::getSingleton('customer/session');
        if ($session->isLoggedIn()) {
        // is already login redirect to account page
            return;
        }
        $result = array('success' => false);
        if ($this->getRequest()->isPost())
        {
            $login_data = $this->getRequest()->getPost('login');
            if (empty($login_data['username']) || empty($login_data['password'])) {
                $result['error'] = Mage::helper('onepagecheckout')->__('Login and password are required.');
            }
            else
            {
                try
                {
                    $session->login($login_data['username'], $login_data['password']);
                    $result['success'] = true;
                    $result['redirect'] = Mage::getUrl('*/*/index');
                }
                catch (Mage_Core_Exception $e)
                {
                    switch ($e->getCode()) {
                        case Mage_Customer_Model_Customer::EXCEPTION_EMAIL_NOT_CONFIRMED:
                            $message = Mage::helper('onepagecheckout')->__('Email is not confirmed. Resend confirmation email.', Mage::helper('customer')->getEmailConfirmationUrl($login_data['username']));
                            break;
                        default:
                            $message = $e->getMessage();
                    }
                    $result['error'] = $message;
                    $session->setUsername($login_data['username']);
                }
            }
        }
        $this->_redirect('customer/account/');
        //$this->getResponse()->setBody(Mage::helper('core')->jsonEncode($result));
    }

Now let’s create mymodule.xml file in app/design/frontend/default/default/layout/

Create a template file callled as view.phtml in app/design/frontend/default/default/template/mymodule
this is our login form

create a Block file called as Mymodule.php in app/code/local/Test/Mymodule/Block/  the block folder might not be there, we have to create the same.

type this url in your browser and check the custom login module http://example.com/mymodule where example.com will be your domain name.