infinite scroll code

global $wp_query; 
	
	wp_register_script( 'understrap_loadmore', get_stylesheet_directory_uri() . '/myloadmore.js', array('jquery') );
 
	wp_localize_script( 
	'understrap_loadmore', 
	'understrap_loadmore_params', 
	array(
		'ajaxurl' => site_url() . '/wp-admin/admin-ajax.php',
		'posts' => json_encode( $wp_query->query_vars ),
		'current_page' => get_query_var( 'paged' ) ? get_query_var('paged') : 1,
		'max_page' => $wp_query->max_num_pages
	) );
 
 	wp_enqueue_script( 'understrap_loadmore' );
 	
 	
 	
 	// my-loadmore.js
 	
 	
 	jQuery(function($){
	var canBeLoaded = true,
	    bottomOffset = 2000;
 
	$(window).scroll(function(){
		var data = {
			'action': 'loadmore',
			'query': understrap_loadmore_params.posts,
			'page' : understrap_loadmore_params.current_page
		};
		if( $(document).scrollTop() > ( $(document).height() - bottomOffset ) && canBeLoaded == true ){
			$.ajax({
				url : understrap_loadmore_params.ajaxurl,
				data:data,
				type:'POST',
				beforeSend: function( xhr ){
					canBeLoaded = false; 
				},
				success:function(data){
					if( data ) {
						$('#main').find('article:last-of-type').after( data );
						canBeLoaded = true;
						understrap_loadmore_params.current_page++;
					}
				}
			});
		}
	});
});





// nonce functions

function understrap_loadmore_ajax_handler(){
 
	$args = json_decode( stripslashes( $_POST['query'] ), true );
	$args['paged'] = $_POST['page'] + 1;
	$args['post_status'] = 'publish';
 
	
	query_posts( $args );
 
	if( have_posts() ) :
 
		while( have_posts() ): the_post();
			get_template_part( 'template-parts/post/content', get_post_format() );
		endwhile;
 
	endif;
	die;
}

add_action('wp_ajax_loadmore', 'understrap_loadmore_ajax_handler');
add_action('wp_ajax_nopriv_loadmore', 'understrap_loadmore_ajax_handler');


blog url: https://rudrastyh.com/wordpress/load-more-posts-ajax.html