Add a Topic page to WordPress

Do you want to have an introduction to a category of posts (or by a tag). Add a page template to your theme for topic pages.

All the articles in this site are categorized. The menus are based on these categories, but there is a topic page to introduce each category. After the introduction there is a list of all articles in the category (the featured image, title and excerpt). This kind of topic page template is not typically included in WordPress themes, but you can roll your own.

Automation is the way to ease administraton. In this code example the page slug automatically determines the category of the posts displayed. E.g. if the page slug is "wordpress" then all posts in "wordpress" category are displayed at the end of the page (to be precise, the category slug is "wordpress"). You can also make such a topic page template for keywords.

Copy page.php to topic.php. If there is no page.php in your theme, copy it from the parent theme. Add Template Name to the comments at the top:

 * The template for displaying topic pages
Template Name: Topic

Towards the end of topic.php, but inside of the main <div> (or <main> element, if there is one), add:

$args = array( 
    'category_name' => get_post_field( 'post_name' ),
    'numberposts' => -1,     // All posts
    'orderby' => 'title',    // Alphabetically
    'order' => 'ASC'         // From A to Z
$topicposts = get_posts( $args );

foreach ( $topicposts as $post ) {
    setup_postdata( $post );
    <article id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
    <?php if ( has_post_thumbnail() ) { the_post_thumbnail('thumbnail'); } ?>
    <header class="entry-header listing">
        <a href="<?php the_permalink(); ?>">
            <?php the_title( sprintf( '<h3>', '</h3>' )); ?>
    </header><!-- .entry-header -->
    <?php the_excerpt(); ?>
    </article><!-- #post-## -->

There is one caveat: There are <?php and ?> at the beginning and end of the code. They are needed if the code is inserted inside of HTML code, but should be removed if inserted inside PHP code.

The $args at the beginning defines the posts to be displayed. The most important is the first one, where category_name field gets the value of the current page slug. If you want to use keywords instead, use 'tag' => get_post_field( 'post_name' ). The other fields control the count and ordering of the posts. Removing those lines would get you the defaults (5 articles at a time, ordered by time published, newest first).

To use:

  1. Create a new page and use page template Topic
  2. Type in the introduction you want
  3. Use the same value for the page slug as the slug for the category (or tag)

Polylang language menu

How to create the language menu in the upper right corner using WordPress and Polylang?

This is a bilingual site: Finnish and English. There are multiple language plugins for WordPress and this site uses Polylang. Polylang is very nice and useful, but lacks the menu type so common in Finland: Finnish | Swedish | English. Writing a standalone plugin for such a menu turned out to be complicated, so this article will guide you to create it by hand.

The language menu requires changes to the theme. The best starting point is to create a child theme and there are multiple guides available to do that. When you have a child theme, add this to the style.css file:

/* Languages horizontally */ 
#language ul { margin: 0; padding: 0; } 
li.lang-item { list-style-type: none; display: inline; } 
li.lang-item:before { content: " | "; } 
li.lang-item:first-child:before { content: none; }

The functions.php file in the theme needs a definition for a new widget area:

register_sidebar( array(
        'name'          => 'Language',
        'id'            => 'language',
        'description'   => 'Polylang switcher area.',
        'before_widget' => '<div id="language">',
        'after_widget'  => '</div>'
) );

You need to add the widget area defined above to the header.php in the spot of your choice:

<aside id="language-nav" role="navigation">
    <?php dynamic_sidebar( 'language' ); ?>
</aside><!-- .language-nav-widgets -->

Finally add Language Switcher widget to Language widget are in WordPress Dashboard.

You can align the widget area to the right by adding for example this code to the style.css:

aside#language-nav {
  text-align: right;
  margin-left: auto;