<?php 
	if(!empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest') {
		if ( have_posts() ) :
				// Start the Loop.
				while ( have_posts() ) : the_post();
					
					?>
					<div data-title="<?php the_title(); ?>"></div>
					<?php
					get_template_part( 'content', get_post_format() );

				endwhile;
				

			else :
				// If no content, include the "No posts found" template.
				get_template_part( 'content', 'none' );

			endif;
			die();
	}
?>

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If you need on ajax request to get only the post content

WordPress - get only post content on ajax request

PHP