Can I make the next/previous post be in the same category as the current post?

Whoops a typo in the links I’d sent: my 3 category blogs are http://www.katiesonger.com/category/writing, http://www.katiesonger.com/category/health, and http://www.katiesonger.com/category/politics.

Hi there,

Thanks very much for this info. I’m still a little confused: I see the code I need to use, and I see that the link you sent says I should put this code in single.php, but I don’t know where I should put the new code into the single.php code.

Here is the entire code for single.php:

<?php
/**
 * The template for displaying all single posts.
 *
 * @link https://developer.wordpress.org/themes/basics/template-hierarchy/#single-post
 *
 * @package Blog_Way
 */

get_header(); 

	/**
	 * Hook - blog_way_before_primary.
	 *
	 * @hooked blog_way_before_primary_action - 10
	 */
	do_action( 'blog_way_before_primary' );
?>

	<?php
	while ( have_posts() ) : the_post();

		get_template_part( 'template-parts/content', 'single' );

		do_action( 'blog_way_related_post' );

		do_action( 'blog_way_author_info' );

		//Load up the navigation function if it is enabled.
		$show_nav = blog_way_get_option( 'show_post_nav' );

		if ( 1 == $show_nav ) :
			the_post_navigation();
		endif;

		// If comments are open or we have at least one comment, load up the comment template.
		if ( comments_open() || get_comments_number() ) :
			comments_template();
		endif;

	endwhile; ?>

<?php
	/**
	 * Hook - blog_way_after_primary.
	 *
	 * @hooked blog_way_after_primary_action - 10
	 */
	do_action( 'blog_way_after_primary' );

	/**
	 * Hook - blog_way_sidebar.
	 *
	 * @hooked blog_way_sidebar_action - 10
	 */
	do_action( 'blog_way_sidebar' );

get_footer();

Can you tell me where I should insert the new code? Thanks very much!

Thank you! This partly worked, but there is still one problem.

Here is the code I’ve inserted, combining your instructions with the WordPress codex instructions found here:

	if ( 1 == $show_nav ) : ?>
	<div class="alignright"><?php next_post_link( '%link', '%title', TRUE ); ?></div>
	<div class="alignleft"><?php previous_post_link('%link', '%title', TRUE); ?></div>
<?php
Endif;

The remaining problem is that the next/previous post links are excluding parent categories; right now they are only including child categories. I’m guessing this is because I am using category pages? Maybe the next_post_link is ignoring the parent categories because each blog is already located on a parent category page?

How can I modify this code, or use other code somewhere else, to clarify that I want next_post_link and previous_post_link to use PARENT categories?

Thanks very much!
Katie

And finally, a couple more questions:

– I wanted the next/previous post links to appear BEFORE the Related Posts, so I moved them in single.php. But now there is no space (no line break) between the next/previous post links and the Related Posts. How can I make space between them?

– Some of my blog post titles are very long. When that occurs, the next/previous post links interfere with each other, moving each other up or down on the page instead of wrapping the long title. How can I wrap it?

So to summarize, my questions are:

1) How do I include parent categories in the next/previous post links?
2) How can I make the next/previous post links appear as a black button with white text, as in the theme?
3) How do I add space after the next/previous post links, so that there is space between them and Related Posts?
4) How can I ensure that the text of long titles will be wrapped in the next/previous post links, so that they will not move the other link up or down the page?

Thank you!
Katie