Set HTML editor as default for specific pages only?

You can set the html editor as the default editor (http://www.wpbeginner.com/wp-tutorials/how-to-set-html-editor-as-the-default-post-editor-in-wordpress/) but you cannot change the default editor for specific posts/pages.

I have a similar problem, only the HTML bits that kept disappearing are from my Pages.

So after seeing this, armed with the piece of code from panther8’s link, I did a bit of searching and found this page about Page Detection for Post Types in the Admin Menu and I managed to cobbled together something that works for me.

function post_type_script($pagehook) {
    global $post_type;
    $pages = array( 'post.php', 'post-new.php' );
    if ( in_array( $pagehook, $pages ) && $post_type == 'page' ) {
        add_filter( 'wp_default_editor', create_function('', 'return "html";') );
    }
}

add_action('admin_enqueue_scripts', 'post_type_script', '', array(&$this) );

I’m not sure how you can edit it to help with your issue, but I believe it can be used for getting the post.php to do certain things only for posts of certain criteria.

I do know that post.php has the post ID for the post to be edited. A vague idea in my head is to store a list(array?) of the post ID of the posts which shouldn’t be edited somewhere(options?) and check with the list when loading post.php.

Maybe somebody else can work it out. :3 I’m not confident of my code-cobbling skills for something this bit more complicated. I think it can work as a simple plugin, to be honest.

Drats, I meant to write that and I forgot. The link in my post actually explains the more complicated part better, but I’ll try and explain.

Basically, it checks what page I’m loading and see if it matches the $pages array (which I put ‘post.php’ and ‘post-new.php’ because that’s where the editor is) and then it checks (with some data passed to the page) to see if the post type is ‘page’ (because I want only Pages to have HTML editor as default), and if both options are yes, it runs the add_filter to set the default editor to html editor.

There are bits in between that I’m not sure how exactly they work, but the code is working for me.