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When I use add_action( 'the_content'...

The content of the page just won't load. Also the content I am trying appears in all kinds of places in the page. Why?

Is there a way to force it to only appear under my post?

function __construct()
{
    add_action( 'wp_footer', array(&$this, 'loadRatingsJs') );
    add_action( 'wp_ajax_valnetincGetRatings', array(&$this, 'getRatings' ) );
    add_action( 'wp_ajax_nopriv_valnetincGetRatings', array(&$this, 'getRatings' ) );
    //add_action( 'the_excerpt', array(&$this, 'getRatings' ) );
    add_filter( 'the_content', array(&$this, 'getRatings' ) );
}

public function getRatings($content)
{
    //echo $postID;
    if(function_exists('the_ratings')) {
        /*if(is_null($postID))
        {
            the_ratings();
        } else {
            the_ratings('div', $postID);
        }*/
        $rating = the_ratings();
        return $content.$rating;
    }
}
| improve this question | |
  • 2
    your question is a bit confusing, it would help to see the actual relevant code. what does the function you hook to the_content action do? do you call the_content function in your loop? – Milo Jan 13 '14 at 15:47
2

the_content is not an action, it is a filter. You should be concatenating a string and returning it. It sounds like you are echoing content directly.

That is: 

// wrong
function test_content($content) {
  echo 'this is wrong';
}
add_filter('the_content','test_content');

// right
function test_content($content) {
  return 'this is right '.$content;
}
add_filter('the_content','test_content');
| improve this answer | |
  • the fact that add_action and add_filter are interchangeable adds a nice layer of confusion. – Milo Jan 13 '14 at 16:29
  • Using filter works. But again the new content appears in many places in the page. I just want it to appear for the post content. Also it now only shows on top of the post and not at the bottom like I would like. I tried to interchange the var but nothing works. – jnbdz Jan 13 '14 at 16:54
  • @Milo : I completely agree. add_action and add_filter should be distinct. – s_ha_dum Jan 13 '14 at 17:17
  • @Jean-NicolasBoulayDesjardins : you are going to have to post your code if you want a more specific response to your question. – s_ha_dum Jan 13 '14 at 17:17
1

One potential problem is that you don't return anything if your conditional fails:

public function getRatings($content)
{
    //echo $postID;
    if(function_exists('the_ratings')) {
        /*if(is_null($postID))
        {
            the_ratings();
        } else {
            the_ratings('div', $postID);
        }*/
        $rating = the_ratings();
        return $content.$rating;
    }
}

To simplify:

public function getRatings($content)
{
    // Conditional
    if(function_exists('the_ratings')) {
        // Do stuff
        // Return modified content
        return $content.$rating;
    }
}

The problem is: you don't return anything if the_ratings() function doesn't exist. You need to account for that condition:

public function getRatings($content)
{
    // Conditional
    if(function_exists('the_ratings')) {
        // Do stuff
        // Return modified content
        return $content.$rating;
    }
    // Condition is false;
    // Just return the original content
    return $content;
}

An even simpler way (perhaps) is to return outside the conditional, and only modify inside the conditional:

public function getRatings($content)
{
    // Conditional
    if(function_exists('the_ratings')) {
        // Do stuff
        // Modify content
        $content .= $rating;
    }
    // Return content, modified or unmodified
    return $content;
}
| improve this answer | |
  • Actually the the_rating does output something. What used to not output anything was the post... But now it works. the only problem I still have is that the_ratings() content does not output at the bottom of the post but at his top. It also appears at other places in the page. – jnbdz Jan 13 '14 at 19:01
  • Please edit your question and add those clarifications - especially as they relate to the up-voted comment. – Chip Bennett Jan 13 '14 at 19:20

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