post Excerpt

I think what is wanted here is something I was going to ask as well.

I have several textarea MB fields (actually in a custom post type, but could also apply to a standard post).

What I want is for the MB textarea field to automatically be linked to the standard WP Excerpt field in much the same way that you linked a custom image field to the User Profile image.

The reason for this in my case is that the custom post type only has the custom fields displayed through a Beaver Themer template, I don't use the standard post content area at all. As a result on post archive pages when the loop is trying to get the excerpt (or the first n words of the post content) it doesn't find anything. To avoid having to copy the text from one of the textarea custom fields and paste it into the post excerpt field it would be great to have the excerpt field automatically get populated with that custom field.

Can this be done similar to the way you did the User Profile image?

Hi, we have a tutorial for doing this here. It's for post content, but it also works for post excerpt if you change the field ID in the tutorial to excerpt.

Here is the code: https://pastebin.com/t3tBWcG6

Here's how I tried to adapt your wysiwyg field to post content example to fit my wysiwyg field to post excerpt. Not working, it removes excerpt field from CPT, but does not return the wysiwyg field content to the post_excerpt in a loop.

// Remove the editor. Change 'post' to your custom post type.
add_action( 'init', function () {
    remove_post_type_support( 'code-snippet', 'excerpt' , 'post_content' ); // also tried to remove the post_content editor for the CPT, but it still shows
} );
add_filter( 'rwmb_meta_boxes', function ( $meta_boxes ) {
// was not sure if the following 3 lines were necessary so commented them out, did not work either way
    // Get the current post content and set as the default value for the wysiwyg field.
    // $post_id = filter_input( INPUT_GET, 'code-snippet', FILTER_SANITIZE_NUMBER_INT );
   //  $post_content = get_post_field( 'post_excerpt', $post_id );
    $meta_boxes[] = [
        'title'      => 'Code Snippet Before', // this is the Field Group Title
        'post_types' => 'code-snippet', // Change 'post' to your custom post type.- done
        'fields'     => [
            // Register a wysiwyg field of which the content is saved as post content.
            [
                'type' => 'wysiwyg',
                'id'   => 'excerpt', // This is the must!
                'name' => 'Reason for snippet', // label for the custom field
                'std'  => $post_excerpt, // was not sure what to put here
            ],
            // Custom style to overwrite the editor style set by WordPress.
            [
                'type' => 'custom_html',
                'std'  => '<style>#wp-content-editor-tools{background:none;padding-top:0;}</style>',
            ],
        ],
    ];
    return $meta_boxes;
} );
// Set the value for the 'excerpt' field.
add_filter( 'rwmb_content_field_meta', function() {
    $post_id = filter_input( INPUT_GET, 'code-snippet', FILTER_SANITIZE_NUMBER_INT ); //assumed I should use code-snippet the CPT instead of 'post' here
    return get_post_field( 'post_excerpt', $post_id ); // assumed I should use 'post_excerpt instead of 'post_content here
} );
// did not think the following were necessary in this case so commented them out
// Do not save 'content' field to post meta.
// add_filter( 'rwmb_content_value', '__return_empty_string' );

I made a short video to explain things here:

https://www.loom.com/share/0b651f654cce47aa82419cd91631e100

And here is the code for both content and excerpt:

https://pastebin.com/1tL0bNhW

getting very close 🙂

Since I prefer to use the MB Builder to create the CPT and Custom Fields, I removed that part of the php code you put in pastebin so I'm left with something that works great except for one problem using Beaver Themer to layout the front end. Here is the code I'm using:

/**
* In MB Builder I have a custom field replace the post <strong>content</strong> by setting custom field "Reason for Snippet", wysiwyg field ID to content
* I removed the custom post excerpt field from code snippets custom post type <strong>done through unchecking box in CPT setting </strong>
* I removed the custom post content editor field from code snippets CPT <strong>done through unchecking box in CPT setting </strong>
**/
// what I'm left with is:
// This is for content
add_filter( 'rwmb_content_field_meta', function() {
    $post_id = filter_input( INPUT_GET, 'post', FILTER_SANITIZE_NUMBER_INT );
    return get_post_field( 'post_content', $post_id );
} );
add_filter( 'rwmb_content_value', '__return_empty_string' );

The custom field "Reason for Snippet" field content now shows up on the front end in Beaver Builder layouts that display posts where the excerpt would be. It turns out this is better than making that field the Excerpt because the manual excerpt field overrides controls on the front end like how many words are displayed. The Post modules in Beaver Builder for example will grab the post content and use it as an excerpt and you can set it to display say the first 25 words of the content if you want. If the custom field becomes the Excerpt then the whole field content is displayed instead regardless of the excerpt length setting. Also RSS feeds will grab part of the content when the Excerpt field is empty. So it's better to use the custom field as the content instead of the excerpt for my usage. But an advantage is a manual Excerpt field can have html which gets stripped out when grabbing the first n words of the content.

Now for the problem I ran into with Beaver Themer. The wysiwyg field with ID set to content allows text formatting in both the visual and text tabs including Add Media, etc. But trying to display the MB custom field on the front end doesn't work.

Using the Themer connector in a text or html module if I select a metabox field I see the Reason for Snippet field, and when I insert it I get: [wpbb post:meta_box field='content'] but nothing shows on the front end even if there is content in that custom field. The workaround is to connect with the Post Content [wpbb post:content]. Then everyting shows up ok fully formatted with and the images too. It's confusing not to be able to select the MB field, but not the end of the world if you know to use the Post Content connector instead.

@B: You don't need to set custom attributes, all you need to do in Meta Box Builder is set the field ID to content or excerpt, like this: https://imgur.com/998hlgP. Nothing more.

And if you can, add this code to your theme's functions.php file. Or you can install the Code Snippet plugin (free on .org) and add the following code:

add_filter( 'rwmb_content_field_meta', function() {
    $post_id = filter_input( INPUT_GET, 'post', FILTER_SANITIZE_NUMBER_INT );
    return get_post_field( 'post_content', $post_id );
} );
add_filter( 'rwmb_content_value', '__return_empty_string' );

add_filter( 'rwmb_excerpt_field_meta', function() {
    $post_id = filter_input( INPUT_GET, 'post', FILTER_SANITIZE_NUMBER_INT );
    return get_post_field( 'post_excerpt', $post_id );
} );
add_filter( 'rwmb_excerpt_value', '__return_empty_string' );