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Change FlexSlider options on mobile in Woocommerce

By default on single product page enabled option ‘controlNav’ = ‘thumbnails’. It’s ok for desktop. But on mobile i want to be ‘controlNav’ = true (dots). I tried to do it with ajax, but I think I need somehow refresh that fragment with flex slides to apply filter. I cant get it.

in JS file:

if (window.matchMedia('(max-width: 800px)').matches) {
      
        $.ajax({
            url: wc_add_to_cart_params.ajax_url,
            data: { action: 'mobile_slider'},
            type: 'POST'
        })
        .then(res => console.log('works', res))
    }

in functions.php:

function hellenik_change_slider_mobile()
{
    add_filter('woocommerce_single_product_carousel_options', 'hellenik_update_woo_flexslider_options');

    function hellenik_update_woo_flexslider_options($options)
    {

        $options['smoothHeight'] = true;
        $options['controlNav'] = true;
        $options['animation'] = "slide";
        $options['slideshow'] = false;



        return $options;
    }
    
    wp_die();
}
add_action('wp_ajax_mobile_slider', 'hellenik_change_slider_mobile');
add_action('wp_ajax_nopriv_mobile_slider', 'hellenik_change_slider_mobile');

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Answer

The following that uses WooCommerce dedicated woocommerce_single_product_carousel_options filter hook and using WordPress wp_is_mobile() conditional tag:

add_filter( 'woocommerce_single_product_carousel_options', 'filter_single_product_carousel_options' );
function filter_single_product_carousel_options( $options ) {
    if ( wp_is_mobile() ) {
        $options['smoothHeight'] = true; // Already "true" by default
        $options['controlNav'] = true; // Option 'thumbnails' by default
        $options['animation'] = "slide"; // Already "slide" by default
        $options['slideshow'] = false; // Already "false" by default
    }
    return $options;
}

Code goes in functions.php file of your active child theme (or active theme). Tested and works.

See WooCommerce related default settings for woocommerce_single_product_carousel_options hook:

'flexslider' => apply_filters( 'woocommerce_single_product_carousel_options',
    array(
        'rtl'            => is_rtl(),
        'animation'      => 'slide',
        'smoothHeight'   => true,
        'directionNav'   => false,
        'controlNav'     => 'thumbnails',
        'slideshow'      => false,
        'animationSpeed' => 500,
        'animationLoop'  => false, // Breaks photoswipe pagination if true.
        'allowOneSlide'  => false,
    )
),

Documentation: WordPress Developer Resources – wp_is_mobile() conditional function

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