How To Show A Login/register Page On Clicking A Submit Button Or A Link

Store Builder Questions
1

How can we show a login/register page on clicking a submit button or a link on a page ?

2

Use the code similar to

Link text
3

Use the code similar to

Link text

Use the code similar to

Link text

Can we write some php code in the backend to do the same or will it be on the smarty template only?

4

Can we write some php code in the backend to do the same or will it be on the smarty template only?

You can use pre controller and the following code in php:

    if (empty($auth['user_id']) && empty($auth['order_ids'])) {
        return array(
            CONTROLLER_STATUS_REDIRECT,
            'auth.login_form?return_url=' . urlencode(Registry::get('config.current_url'))
        );
    }