hook filter after the_content on a specific page

Question

I've made a function to hook after the_content. This is only working on certain pages/posts. It's working on the default template but not on my custom one's.

function insertFootNote($content) {
   $content.= "<div>";
   $content.="additional content";
   $content.= "</div>";
   return $content;
}

add_filter ('the_content', 'insertCpontent');

In my custom page template I haven the following code

<?php if(have_posts()): ?>
<?php get_template_part( 'part', 'addressbook' ); ?>
<?php endif; ?>

in the template('part-addressbook.php) I have the following.

 echo '<div class="category-description"><p>'.get_the_content().'</p></div>';

On this template part the hook is not working although i'm using the_content/get_the_content function

Why does the hook does not work in this case?

Answer 1

get_the_content do not apply the_content filter. You have to apply it after receiving contents like following

<?php apply_filters('the_content',get_the_content( $more_link_text, $stripteaser, $more_file )) ?>

It is also detailed at the bottom of codex page

Answer 2

You are already echoing the data. Just use the_content():

echo '<div class="category-description"><p>',the_content(),'</p></div>';

Please note: those are commas not periods. echo will accept multiple parameters separated by commas and you will not see the odd results you get if you try to concatenate. The above is functionally the same as:

echo '<div class="category-description"><p>';
  the_content();
echo '</p></div>';