Shortcode to show list of project-related categories/tags on Project Page itself

[schneiderbrett]

Hello

I'm working on the "info section" of my project page template. Now I was wondering if there is already a built-in solution to show a list of categories or tags related to the project itself.

Ideally i'm thinking of some shortcode with which all subcategories of a group, which are related to the project itself are shown/listed.

Example:
Main Category: Clients
Sub-Categories: Client1, Client2, Client3....

-> The shortcode [project_page_subcats_client] will generate a list of all "Client" Sub-Categories, which are selected for this project.

I installed the "Shortcoder" plugin, but didn't manage to get done yet. My issue is I don't really know where to start looking. Some Java coding probably? Would be great if somebody can give me some first pointers!

The project-page I'm talking about: https://schneiderbrett.com/hotel-hasle-linie/

Kind regards,
Amadeus

[schneiderbrett]

Hello again

I tryed different things and here my solution so far:

Basically the best info I found was after searching the web for something like "display tags on post page wordpress".

What I found was that some changes have to be made in the "function.php" file which can be found in WP->Appearance->Theme File Editor.

The changes where some code (probably java?) Here an example, which worked for me (after some modifications). What I did here was generate a list of "sub-categories" of a certain "main-category" to be shown on a project page itself.

function getWorkCatList() {
    global $post;
	$args = array('parent' => 1);
	$categories = get_categories( $args );
        $categoryOutput = [];

    if (!empty($categories)) {
        array_push($categoryOutput, '<ul class="_Default">');
        foreach($categories as $category) {
            array_push($categoryOutput, '<a href="' . get_category_link( $category->term_id ) . '" title="' . sprintf( __( "View all posts in %s" ), $category->name ) . '" ' . '>' . $category->name.'</a> </br> ');
        }
        array_push($categoryOutput, '</ul>');
    }

    return implode('', $categoryOutput);
}

add_shortcode('work_cats_pg', 'getWorkCatList');

Explaining:
$args = array('parent' => 1); <== Here manually input the id of the "main-category"

array_push($categoryOutput, '<ul class="_Default">'); <== Here manually indicate which Text Format to use

array_push($categoryOutput, '<a href="' . get_category_link( $category->term_id ) . '" title="' . sprintf( __( "View all posts in %s" ), $category->name ) . '" ' . '>' . <== Here generating a clickable link to the sub-category page itself.

add_shortcode('work_cats_pg', 'getWorkCatList'); <== Finally defining the Shortcode. The list of project-related categorys can be inserted on any page by using following shortcode: [work_cats_pg]

The aim of all this? Less repetitive work with every new project which is posted. And projects basically show up anywhere where the user clicks a link. ;P

If anybody sees a better solution to all this feel free to post it. I just arrived here through trial and error - probably there are more efficient solutions out there.

One last question: Are the changes made in the "functions.php" file permanent? Hope to not crash my site with the next update.

Best regards,
Amadeus

[schneiderbrett]

Hi there

A little problem came up, which I can't seem to solve.

Thanks to the code I'll post below I can get all the active sub-categories filtered by main category. What is missing is that the sub-categories are filtered according to current post. (Not only show globaly active sub-categories but show all active sub-categories related to current post).

function getProjSkillList() {
    global $post;
	$args = array('parent' => 193);
	$categories = get_categories( $args );
    $categoryOutput = [];

    if (!empty($categories)) {
        array_push($categoryOutput, '<ul class="_Default">');
        foreach($categories as $category) {
            array_push($categoryOutput, '<a href="' . get_category_link( $category->term_id ) . '" title="' . sprintf( __( "View all posts in %s" ), $category->name ) . '" ' . '>' . $category->name.'</a> </br> ');
        }
        array_push($categoryOutput, '</ul>');
    }

    return implode('', $categoryOutput);
}
add_shortcode('project_skills_pg', 'getProjSkillList');

By changing the number "193" I can control by which main category the sub-categories should be filtered.

The shortcode [project_skills_pg] can be placed on page to show list of sub-categories.

What changes to make, so that only sub-categories related to the current post are showing?

Link to a page: https://schneiderbrett.com/fr/hotel-hasle-linie/

Happy about any kind of hint/feedback!

Best,
Amadeus

[schneiderbrett]

And last question resolved again. Here the code:

function createPostListSubCatWork() {
	global $post;
	$categories = wp_get_object_terms( $post->ID, 'category', [ 'parent' => 1, 'number' => 99 ] );
    $categoryOutput = [];

    if (!empty($categories)) {
        array_push($categoryOutput, '<ul class="_Default">');
        foreach($categories as $category) {
            array_push($categoryOutput, '<a href="' . get_category_link( $category->term_id ) . '" title="' . sprintf( __( "View all posts in %s" ), $category->name ) . '" ' . '>' . $category->name.'</a> </br> ');
        }
        array_push($categoryOutput, '</ul>');
    }

    return implode('', $categoryOutput);
}
add_shortcode('work_cats_pg', 'createPostListSubCatWork');

• List categories for the current post: [work_cats_pg]
• The categories should be children of category 1.
• No more than 99 positions should be displayed.

Source which kinde resolved it for me: https://wordpress.stackexchange.com/questions/330128/display-a-list-of-subcategories-from-specific-category-a-post-belongs-to

Best regards,
Amadezs