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I have a form in the admin-backend of a selfmade plugin, written the old fashioned style. So I'm not using the Settings API. Instead I've written a form, added nonces, wrote an endpoint checking the nonces and so on.

Now I want to utilize the Settings API of WordPress to provide a modern way of managing my plugin. But I'm stuck with handling the API according my needs for adding additional input fields dynamically (accomplished via JavaScript).

Here's my use case (simplified): I'm managing the box offices of movies. So I have a bunch of movies, I read from a custom table and create an output via foreach:

// $movies contains the result of my MySQL query
foreach ($movies as $mkey => $mvalue) {
        $moviefacts = new NT_Movie($mvalue['tmdb_id']);
        echo '<tr>
        <td style="width: 60px"><img src="'.$moviefacts->get_the_poster_url('xs') . '" width="50" /></td>
        <td><input type="hidden" name="id[]" value="' . $mvalue['id'] . '" />
        <input type="text" name="moviename[]" value="' . $moviefacts->get_the_title() . '" /></td>
        <td><input type="text" name="real_visitors[]" value="' . $moviefacts->get_the_real_visitors().'" /></td>
        <td><input type="text" name="tmdb_id[]" value="' . $mvalue['tmdb_id'].'" /></td>
        </tr>';
}

For adding new movies to the list, I've created a JavaScript, which adds new rows to the form:

function AddFormField() {
    jQuery('#NTT_form').prepend('<tr>
    <td>&nbsp;</td>
    <td><input type="hidden" name="id[]" value="" />
    <input type="text" name="moviename[]" /></td>
    <td><input type="hidden" name="real_visitors[]" value="DUMMY_NEW_VALUE" /></td>
    <td><input type="text" name="tmdb_id[]" /></td>
    </tr>');
    return false;
}

With this approach, I can iterate through the fields when processing the form, regardless of the amount of datasets: New datasets are recognized by the value "DUMMY_NEW_VALUE" and existing datasets get updated, if something has changed in them.

Do you have any approach, how to transform this setting to the Settings API of WordPress?

Thanks in advance.

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