Conditional statements in functions file

Hello,
In the theme i am developing (using wordpress and the genesis framework), i have a number of conditional statements in the functions file to determine what content appears on which pages, for example:

/* Add directory to directory page*/
function include_storefinder(){
    if ( is_page('a-z-directory') ){
        require(CHILD_DIR.'/storefinder.php');
        remove_action('genesis_post_content', 'genesis_do_post_content');
    }
}

add_action( 'genesis_after_post_title', 'include_storefinder' );

However, when i try to use the same conditional statement to load a javascript only on this page, it stops the script from loading at all; I can only have it on all pages (which increases load time), or none.

/* Register directory.js*/
function directoryinit() {
    if ( is_admin() ) return;
    /* Conditional for a-z directory page won't work */
    wp_register_script('shopDirectory',
        get_stylesheet_directory_uri(). '/js/storedirectory.js',
        array('jquery') );
    wp_enqueue_script('shopDirectory');
    wp_localize_script( 'shopDirectory', 'localnames', localize_vars());

}

add_action('init', 'directoryinit');

I know some of my code is genesis-specific, but the underlying problem of getting a script to load just on the page(s) where it is required is general to wordpress. Thanks in advance for any help.