Conditional statement not working in function

Question

Why doesnt this work ? I am trying to selectively load scripts but the second if statement is not loading them where it should.

function my_init() {
    if (!is_admin()) {

        wp_deregister_script('jquery');
        wp_register_script('jquery', 'https://ajax.googleapis.com/ajax/libs/jquery/1.5.0/jquery.min.js', false, '1.5');
        wp_enqueue_script('jquery');

            if (in_category('41') )  {
            wp_register_script('validator', '/wp-content/themes/myTheme/library/jquery.validationEngine.js', array('jquery'), '2.0', false);
            wp_enqueue_script('validator');

            wp_register_script('vEngine', '/wp-content/themes/myTheme/library/jquery.validationEngine-en.js', array('validator'), '2.0', false);
            wp_enqueue_script('vEngine');
            }

    }   


}
add_action('init', 'my_init');

If I remove the second if statement for that category it works but I want to restrict it to a single category or even an is_single('123')

What am I doing wrong?

Answer 1

I suspect you're doing this too early. The loop isn't setup yet when init is run, so you need to hook it somewhere else. wp_print_scripts and wp_print_styles or get_header are always nice choices. ;-)

Answer 2

I poked around, and it seems that the Codex reference that you can use conditional tags like is_category() in the init hook is incorrect. However, this code does work just fine:

function my_init() {
    if (!is_admin()) {

        wp_deregister_script('jquery');
        wp_register_script('jquery', 'https://ajax.googleapis.com/ajax/libs/jquery/1.5.0/jquery.min.js', false, '1.5');
        wp_enqueue_script('jquery');
    }   
}
function my_scripts() {
    if (in_category('41') )  {
        wp_register_script('validator', '/wp-content/themes/myTheme/library/jquery.validationEngine.js', array('jquery'), '2.0', false);
        wp_enqueue_script('validator');

        wp_register_script('vEngine', '/wp-content/themes/myTheme/library/jquery.validationEngine-en.js', array('validator'), '2.0', false);
        wp_enqueue_script('vEngine');
        }
}
add_action('init', 'my_init');
add_action('wp_print_scripts', 'my_scripts');