Adding Google Analytics to WordPress’ next_post_link function

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Working on setting up Google Analytics within a custom theme. I make use of the previous_post_link and next_post_link functions within my site to do some navigation pieces. Now I’m trying to add in some Google Analytics to those.

I’ve added this to my functions.php file:

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add_filter('next_post_link', 'ga_next_post_link');
function ga_next_post_link($link) {
    $link = str_replace('" rel="next">', '" onclick="ga('send', 'event', 'NavNext', 'click');" rel="next">', $link);
    return $link;
}
add_filter('previous_post_link', 'ga_previous_post_link');
function ga_previous_post_link($link) {
    $link = str_replace('" rel="last">', '" onclick="ga('send', 'event', 'NavLast', 'click');" rel="last">', $link);
    return $link;
}

When I try that, I get a 500 error thrown back at me. If I replace the ga('...'); junk with test, it will load and work fine.

Anyone know why this is, and how I can fix it?

Post Views: 2

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1 comment

  1. Try escaping your quotes. Since you’re using single quotes on str_replace() you have to escape the quotes in the function itself.

     $link = str_replace('" rel="next">', '" onclick="ga('send', 'event', 'NavNext', 'click');" rel="next">', $link);

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