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[WP] Modifying order of posts in the slider

There is new_royalslider_posts_slider_query_args filter that allows filtering of query arguments.

For example:

If you want to modify existing WP_Query, for example set order by title:

// Add to your theme functions.php
function newrs_custom_query($args, $index) {
    // $args is WP_Query arguments object. 
    // feel free to change it here
    $args['orderby'] = 'title';

    // $index is an ID of slider that you're modifying

    return $args;
}
add_filter('new_royalslider_posts_slider_query_args', 'newrs_custom_query', 10, 2);

Refer to WordPress codex for the list of available arguments - http://codex.wordpress.org/Class_Reference/WP_Query . Also, useful code that contains list of all possible arguments - https://gist.github.com/luetkemj/2023628

If you want to run multiple post queries for one slider (or you need completely custom query):​

Use new_rs_slides_filter. Example below will add posts with post_type=pages after your current slides:

function add_additional_posts_to_slider($slides, $options, $type) {
        // $options['id'] is a slider index

    $args = array(
        'post_type' => 'page'
    );
    $query = new WP_Query($args);
    
    $additiona_slides = (array)$query->posts;
    if( is_array($additiona_slides) ) {
        $slides = array_merge($slides, $additiona_slides);
    }
    return $slides; // slides is array of WP Post objects that will be displayed in slider
}
add_filter('new_rs_slides_filter', 'add_additional_posts_to_slider', 10, 3);

Cache​

If the code that you added isn't working, make sure that slider isn't cached (set cache refresh time to 0 on RoyalSlider Settings page, or preview it in admin).