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Post Thumbnails: Only update featured images when saving a post.

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Previously, changing the post thumbnail of a published post in the edit screen
would immediately apply the change, rather than waiting for the post to be
saved before applying the update. This could lead to someone unintentionally
editing the post thumbnail on a published post, and made it impossible to
preview changes to post thumbnails on published posts before saving the change.

This introduces a new Ajax handler, `wp_ajax_get_post_thumbnail_html()` to
retrieve the HTML for the post thumbnail meta box without updating the post
meta value for `_thumbnail_id`. It also allows post thumbnail changes to be
previewed by passing the `_thumbnail_id` as a query variable to the preview
screen and adding a new filter, `_wp_preview_post_thumbnail_filter()`, which
gets applied to `get_post_metadata` during the post preview process.

Props flixos90.
Fixes #12922.
Built from https://develop.svn.wordpress.org/trunk@38118


git-svn-id: http://core.svn.wordpress.org/trunk@38059 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Joe McGill
2016-07-20 16:24:28 +00:00
parent c50056a1f2
commit 3dbba0fff3
8 changed files with 90 additions and 8 deletions
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10
wp-includes/post.php
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@@ -3260,6 +3260,16 @@ function wp_insert_post( $postarr, $wp_error = false ) {
}
}
// Set or remove featured image.
if ( isset( $postarr['_thumbnail_id'] ) && ( post_type_supports( $post_type, 'thumbnail' ) || 'revision' === $post_type ) ) {
$thumbnail_id = intval( $postarr['_thumbnail_id'] );
if ( -1 === $thumbnail_id ) {
delete_post_thumbnail( $post_ID );
} else {
set_post_thumbnail( $post_ID, $thumbnail_id );
}
}
if ( ! empty( $postarr['meta_input'] ) ) {
foreach ( $postarr['meta_input'] as $field => $value ) {
update_post_meta( $post_ID, $field, $value );