Loading partial templates with AJAX/PJAX

If you’re concerned about the performance I would recommend using the WordPress API instead of trying to load markup using ajax.

If you look at wp-includes/template-loader.php you can see how WordPress itself figures out which template to use. You could in theory just load that file, but you might have problems with template_redirect.

require_once( ABSPATH . WPINC . '/template-loader.php' );

Alternatively, you can just copy paste the code you need.

$template = false;
if     ( is_embed()          && $template = get_embed_template()          ) :
elseif ( is_404()            && $template = get_404_template()            ) :
elseif ( is_search()         && $template = get_search_template()         ) :
elseif ( is_front_page()     && $template = get_front_page_template()     ) :
elseif ( is_home()           && $template = get_home_template()           ) :
elseif ( is_post_type_archive() && $template = get_post_type_archive_template() ) :
elseif ( is_tax()            && $template = get_taxonomy_template()       ) :
elseif ( is_attachment()     && $template = get_attachment_template()     ) :
  remove_filter('the_content', 'prepend_attachment');
elseif ( is_single()         && $template = get_single_template()         ) :
elseif ( is_page()           && $template = get_page_template()           ) :
elseif ( is_singular()       && $template = get_singular_template()       ) :
elseif ( is_category()       && $template = get_category_template()       ) :
elseif ( is_tag()            && $template = get_tag_template()            ) :
elseif ( is_author()         && $template = get_author_template()         ) :
elseif ( is_date()           && $template = get_date_template()           ) :
elseif ( is_archive()        && $template = get_archive_template()        ) :
else :
  $template = get_index_template();
endif;
/**
 * Filters the path of the current template before including it.
 *
 * @since 3.0.0
 *
 * @param string $template The path of the template to include.
 */
if ( $template = apply_filters( 'template_include', $template ) ) {
  include( $template );
}

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