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I'm trying to include selectivizr.js inside conditional comments. What am I doing wrong here?

<!DOCTYPE html>
<html class="no-js" <?php language_attributes(); ?>>
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <title><?php wp_title('|', true, 'right'); ?></title>
  <meta name="viewport" content="width=device-width, initial-scale=1">

    <?php wp_head(); ?>

  <!--[if (gte IE 6)&(lte IE 8)]>
  <?php
    function blarg(){
      wp_enqueue_script('selectivizr', get_template_directory_uri() . 'assets/js/vendor/selectivizr.js');
    }
    add_action('wp_enqueue_scripts', 'blarg', 101);
  ?>
  <![endif]-->

  <link rel="alternate" type="application/rss+xml" title="<?php echo get_bloginfo('name'); ?> Feed" href="<?php echo esc_url(get_feed_link()); ?>">
</head>

Nothing appears between the comments. I'm using the Roots theme. They have a scripts.php where other scripts are queued. If I put the wp_enqueue_script() in that file it works, but then I can't do the conditional comments.

UPDATE:

OK, the real challenge seems to be getting a script inside conditional comments (or any other particular HTML) will still using the queuing system. What is the best way to do that? Or is there a way?

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3
2

Change

<!--[if (gte IE 6)&(lte IE 8)]>
  <?php
    function blarg(){
      wp_enqueue_script('selectivizr', get_template_directory_uri() . 'assets/js/vendor/selectivizr.js');
    }
    add_action('wp_enqueue_scripts', 'blarg', 101);
  ?>
  <![endif]-->

to

<!--[if (gte IE 6)&(lte IE 8)]>

<script src="<?php echo get_template_directory_uri(); ?>/assets/js/vendor/selectivizr.js" type="text/javascript"></script>

<![endif]-->

wp_enqueue_script() should only be used in a functions file.

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  • +1. Technically, it's not that wp_enqueue_script() can only be used in functions.php; rather, it is that it must be called before wp_head(), inside of which the wp_enqueue_scripts action is fired. By calling it after wp_head(), it can't/won't do anything, because wp_enqueue_scripts has already fired. – Chip Bennett Mar 13 '14 at 19:05
  • I did try putting it before wp_head() but that didn't work either... I see now that I have to have the add_action(wp_enqueue_scripts...) thing inside the functions.php or something that functions.php includes I guess. But then that still places the script outside the conditional comments. So is Pieter's solution the best/only way to get it inside conditional comments? – Moss Mar 13 '14 at 19:26
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Personally, I'd refrain from using wp_enqueue_scripts unless you're in the functions.php file.

If you're looking to call this scripts exclusively on a certain page, you can use the is_page() function. Then to detect the browser and call the function conditionally, we'll use the global variable $_SERVER['HTTP_USER_AGENT'].

function blarg(){
    if (is_page( 'Page_name' )){
        if (preg_match('/(?i)msie [6-8]/',$_SERVER['HTTP_USER_AGENT'])){
            wp_enqueue_script('selectivizr', get_template_directory_uri() . 'assets/js/vendor/selectivizr.js');
        }
    }
}   
add_action('wp_enqueue_scripts', 'blarg');
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