Problem with adding custom field data to postslider.php

Hi,
I’ve introduced a custom field to show an overline / deck head above a post’s heading (variable name $dachzeile) instead of the category name.
Works fine on the post page itself – I managed to add this code snippet to loop-index.php:

$dachzeile = get_post_meta($post->ID, 'dachzeile', true);
				if($dachzeile != '') {  echo '<div class="dachzeile">' . $dachzeile . '</div>'; }
				else { echo '<div class="dachzeile">'; the_category(' / '); echo '</div>';}

However, I struggle to modify postslider.php in the correct way.
Tried to modify the line with h3 like this …

$output .= "<div class='dachzeile_startseite'>".$dachzeile."</div><h3 class='slide-entry-title entry-title' $markup><a href='{$link}' title='".esc_attr(strip_tags($title))."'>".$title."</a></h3>";

… (fallback option from above not implemented yet), but the value of the custom field does not appear.

• What is missing to make the custom field data loading (getting it into the loop, registering support for custom fields within a custom post type in supports $args etc.)?
• How does the correct code with fallback option (“use category name if $dachzeile is empty”) look like?

Thanks!

• This topic was modified 7 years, 5 months ago by fmg. Reason: Addtional links/explanations