Wordpress：FORM标签不会仅显示在Admin Post Lists的第一篇文章中

Question

I'm trying to add the FORM tag in each post at Admin Post Lists but doesn't show only at 1st post.

functions.php code for testing

function manage_posts_columns($columns) {
    $columns['status'] = "form test";
    return $columns;
}

function add_column($column_name, $post_id) {
    echo '<form><input type="text" name="mail" size="3" value="" /></form>';
}
add_filter( 'manage_posts_columns', 'manage_posts_columns' );
add_action( 'manage_posts_custom_column', 'add_column', 10, 2 );

1st line source at Admin Post Lists There's no form tag.

<td class="status column-status" data-colname="form test">
    <input type="text" name="mail" size="3" value="">
</td>

After 2nd line

<td class="status column-status" data-colname="form test">
    <form>
        <input type="text" name="mail" size="3" value="">
    </form>
</td>

Is there something I'm missing?

Thanks in advance for any help.

Regards,

Answer 1

The reason is nest form tag.

Admin Post Lists is huge form and I added form tag. That's why it didn't work.