How to put placeholder text in the main post input area?

I’m making a course plugin for a university in England. I’m looking to put some default placeholder text in the main post content area, on the admin side. Its the rich text editor I want it to go behind. I might just be typing the wrong words, but can’t find it here… preferably a non js thing…

Basically something like ‘Use this area to write an introduction to the course…’.

Thanks

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You can change ‘post’ to which ever post type you want to apply the default content to.

add_filter( 'default_content', 'wpse57907_default_content', 10, 2 );
function wpse57907_default_content( $content, $post ) {
    if ( 'post' == $post->post_type )
        $content = 'Use this area to write an introduction to the course...';

    return $content;
}

Edit

I’m not sure you can add placeholder text to tinymce editors. The followng method will add a placeholder to the underlying textarea (you can view it on the ‘html’, soon to be ‘text’ tab):

add_filter('the_editor','wpse57907_add_placeholder');
function wpse57907_add_placeholder( $html ){
    $html = preg_replace('/<textarea/', '<textarea placeholder="my place holder text" ', $html);
    return $html;
}

But this does not appear on the visual editor (as I say, I’m not sure placeholders work with TinyMCE – if someone knows how, please comment.).

This could be the answer:
http://codepen.io/flesler/pen/AEIFc

Just adding the following CSS will make it work like a placeholder:

[contenteditable=true]:empty:before {
    content: attr(placeholder);
    display: block; /* For Firefox */
}

We just need to find a way to add a data-attribute to the contenteditable element in the tinyMCE and also add the little bit of CSS to it to affect the content editable.

Based off a placeholder plugin I found for TinyMCE, I adapted it to work for WordPress, and created a repo specifically for it. Works perfectly for me!

https://github.com/tripflex/wp-tinymce-placeholder