Create more Meta Boxes as needed

I’d like users to be able to create and remove additional meta box fields as needed.

For example, say a music podcast with a variable amount of songs played per episode.
The user should be able to click a button that will add additional fields to enter each song as needed.

Ideally this would be done without the use of a plugin, but coded into the functions file.


So you mean something like this?

enter image description here

and when you click on Add tracks it becomes this:

enter image description here

if it is what you mean the its done by creating a metabox that has simple jquery function to add and remove fields in it, and the data is saved as an array in of data in a single meta row, here you go:

  add_action( 'add_meta_boxes', 'dynamic_add_custom_box' );

    /* Do something with the data entered */
    add_action( 'save_post', 'dynamic_save_postdata' );

    /* Adds a box to the main column on the Post and Page edit screens */
    function dynamic_add_custom_box() {
            __( 'My Tracks', 'myplugin_textdomain' ),

    /* Prints the box content */
    function dynamic_inner_custom_box() {
        global $post;
        // Use nonce for verification
        wp_nonce_field( plugin_basename( __FILE__ ), 'dynamicMeta_noncename' );
        <div id="meta_inner">

        //get the saved meta as an array
        $songs = get_post_meta($post->ID,'songs',false);

        $c = 0;
        if ( count( $songs ) > 0 ) {
            foreach( $songs as $track ) {
                if ( isset( $track['title'] ) || isset( $track['track'] ) ) {
                    printf( '<p>Song Title <input type="text" name="songs[%1$s]Create more Meta Boxes as needed" value="%2$s" /> -- Track number : <input type="text" name="songs[%1$s][track]" value="%3$s" /><span class="remove">%4$s</span></p>', $c, $track['title'], $track['track'], __( 'Remove Track' ) );
                    $c = $c +1;

    <span id="here"></span>
    <span class="add"><?php _e('Add Tracks'); ?></span>
        var $ =jQuery.noConflict();
        $(document).ready(function() {
            var count = <?php echo $c; ?>;
            $(".add").click(function() {
                count = count + 1;

                $('#here').append('<p> Song Title <input type="text" name="songs['+count+']Create more Meta Boxes as needed" value="" /> -- Track number : <input type="text" name="songs['+count+'][track]" value="" /><span class="remove">Remove Track</span></p>' );
                return false;
// The live() method was deprecated in jQuery version 1.7, and removed in version 1.9. Use the on() method instead. We can use .on
            $(".remove").live('click', function() {


    /* When the post is saved, saves our custom data */
    function dynamic_save_postdata( $post_id ) {
        // verify if this is an auto save routine. 
        // If it is our form has not been submitted, so we dont want to do anything
        if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) 

        // verify this came from the our screen and with proper authorization,
        // because save_post can be triggered at other times
        if ( !isset( $_POST['dynamicMeta_noncename'] ) )

        if ( !wp_verify_nonce( $_POST['dynamicMeta_noncename'], plugin_basename( __FILE__ ) ) )

        // OK, we're authenticated: we need to find and save the data

        $songs = $_POST['songs'];


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