Custom Metabox Listing All Audio Files From Media Library

Snippets by IsItWP

Are you looking for a way to add a metabox to your post editing screen menu containing all audio files? While there’s probably a plugin for this, we have created a quick code snippet that you can use to add custom metabox listing all audio files from media library in WordPress.


All you have to do is add this code to your theme’s functions.php file or in a site-specific plugin:

	add_action("admin_init", "audio_init");
	add_action('save_post', 'save_audio_link');

	function audio_init(){
		add_meta_box("mp3-audio", "MP3 AUDIO", "audio_link", "post", "normal", "low");

	function audio_link(){
		global $post;
		$custom  = get_post_custom($post->ID);
		$link    = $custom["link"][0];
		$count   = 0;

		echo '<div class="link_header">';

		$query_audio_args = array(
			'post_type' => 'attachment',
			'post_mime_type' =>'audio',
			'post_status' => 'inherit',
			'posts_per_page' => -1,

		$query_audio = new WP_Query( $query_audio_args );
		$audio = array();

		echo '<select name="link">';
		echo '<option class="audio_select">SELECT AUDIO FILE</option>';
		foreach ( $query_audio->posts as $file) {
		   if($link == $audio[]= $file->guid){
		      echo '<option value="'.$audio[]= $file->guid.'" selected="true">'.$audio[]= $file->guid.'</option>';
		      echo '<option value="'.$audio[]= $file->guid.'">'.$audio[]= $file->guid.'</option>';
		echo '</select><br /></div>';
		echo '<p>Selecting an audio file from the above list to attach to this post.</p>';
		echo '<div class="audio_count"><span>Files:</span> <b>'.$count.'</b></div>';
	function save_audio_link(){
		global $post;
		if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE){ return $post->ID; }
		update_post_meta($post->ID, "link", $_POST["link"]);

	add_action( 'admin_head', 'audio_css' );
	function audio_css() {
		echo '<style type="text/css">
			border-top:solid 1px #e5e5e5;
			padding:6px 6px 6px 12px;
			margin:0px -6px -8px -6px;
			-moz-border-radius:0px 0px 6px 6px;
			-webkit-border-radius:0px 0px 6px 6px;
			border-radius:0px 0px 6px 6px;
		.audio_count span{color:#666;}

	function audio_file_url(){
		global $wp_query;
		$custom = get_post_custom($wp_query->post->ID);
		echo $custom['link'][0];

Add this code snippet to display the specified audio URL in your WordPress template file.


Note: If this is your first time adding code snippets in WordPress, then please refer to our guide on how to properly add code snippets in WordPress, so you don’t accidentally break your site.

If you liked this code snippet, please consider checking out our other articles on the site like: 19 best WordPress plugins for photographers and 30 ways to make money with online blogging.

Comments   Leave a Reply

  1. Michael Wilhelmsen January 25, 2014 at 3:45 pm

    Hi Kevin, could you tell me how I can get the URL to display as an audio shortcode in my theme?

  2. Hi,

    First this is brilliant, I think something like this should be part of wordpress’s core functionality.

    I’ve been looking at this too see if I can use it as guide for something I’m doing. I’m wondering if there’s a way to adapt this to show link categories rather than media files? Meta boxes with checks and fields I’m familiar with, but drop downs are new for me, and I’m playing around with get_terms(link_category) but its a bit over me on how to work it into a solution like this.

    Any ideas? If not, that’s alright.


    1. Hi Jen,
      What is it that you are trying to do ? if you send me a quick email about it I should be able to help you get things going.

  3. Thank you so much! This is exactly what I needed!

    1. Hey Doug, cool  glad you like the snippet.

  4. Hie,
    Thanks for your post.
    I have a question : how display file name instead of file url.
    Sorry for my bad english.

    1. Hi Anne, You will notice on line 24 & 26 – $file->guid change the second instance on each line or guid to post_title eg:   $file->post_title

      line 24

      echo ‘guid.'” selected=”true”>’.$audio[]= $file->guid.”;

      echo ‘guid.'” selected=”true”>’.$audio[]= $file->post_title.”;

      line 26:
      echo ‘guid.'”>’.$audio[]= $file->guid.”;

      echo ‘guid.'”>’.$audio[]= $file->post_title.”;

      1. Hie Kevin,
        Thanks a lot for your help !

        1. No problem Anne enjoy the wordpress snippets,

  5. well, nice tips.Is there any sample site that already success to use your script?

    1. Its hard to know because a lot of people like this snippet, but since its an admin snippet it is hard to tell.

  6. Hi Kevin, I have a request which may also relate to this article. I hope you could take a look at it and consider if you could publish an article about it.

    My users use custom fields to attach files such as pdf, word, etc. to their posts. It would be wonderfull if I could make it alittle easier for the readers to understan that this is a file rather than a link to other sites by adding an icon to the left side of the file title automatically.
    For example, a user uploads a pdf file and bellow the content (front-end) there is the files title and a pdf icon beside the title. I usually use Custom Field Template plugin.

    I appreciate your concern.

    1. Hi Zeb you can do this type of thing with javascript,

      Works very well.  however ill look into an updated version of this snippet as well.

      1. Thanks for the reply Kevin.
        As you already have stated, it needs an update. It uses jQuery 1.2.6 which is outdated and I’m not quite sure if it is optimated for WordPress and security issues. It would be kind of you if you could publish an update for this.  


        1. Hi Zeb,
          Ill post an update soon, however it does not use JQuery, so that should not be a problem.

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