Custom field only on custom post type?

Question

I have added some fields to a custom post type through

function add_electric_portfolio_box() {
        add_meta_box(
                "electric_portfolio_info", __('Detalles de la web'), "electric_portfolio_fields", "electric_portfolio", "normal"
        );    
}

Which I then call with:

add_action('admin_init', 'add_electric_portfolio_box');

But now those custom fields appear in regular pages too. Is it posible to show those fields ONLY on that type of post?

Here is a screenshot of the undesired fields in the regular pages

as opposed to the desired fields in the custom post:

Answer 1

Sure, just check the post type of the post you're on.

global $post; // make sure $post is available
if( get_post_type( $post ) == 'your_custom_post_type's_name' ) {
    add_meta_box( ... );
}

UPDATE: I think the $post variable might not have been getting passed to get_post_type.