Please help me with the js code

Hi,

I like the way you build the template with async js. But I don't know how to use the plugin within my html. Ex: I want to have a flex slider (with thumbnail nav) on my page. I tried this way but it's not work:

    
        
            
                
                    
                        [
![attachment](https://loremflickr.com/1920/1280?random=1)
](#)
                        [
![attachment](https://loremflickr.com/1920/1280?random=2)
](#)
                        [
![attachment](https://loremflickr.com/1920/1280?random=3)
](#)
                    
                
            
        
    
        
    

window.addEventListener('pluginFlexSliderReady', () => {
    var flexpParent = new FlexSlider('.slider-wrap', {
        animation: "slide",
        controlNav: "thumbnails"
    });
});

Thanks