gistfile1.txt

/**
 * INSTALLATION: this code should be pasted into your theme's functions.php file.
 *
 */
function metaslider_slide_change_callback($options, $slider_id, $settings) {
    $options['after'][] = "
    
    // debug
    console.log("current slide: " + slider.currentSlide);
    
    if (slider.currentSlide == 1) { 
        // do something 
    }
    
    if (slider.currentSlide == 2) { 
        // do something 
    }
    
    if (slider.currentSlide == 3) { 
        // do something 
    }
    
    ";
    
    
    return $options;
}
add_filter('metaslider_flex_slider_parameters', 'metaslider_slide_change_callback', 10, 3);