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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.

git-svn-id: https://develop.svn.wordpress.org/trunk@38118 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Joe McGill
2016-07-20 16:23:36 +00:00
parent f5f8d1df2b
commit 2586eeeeca
6 changed files with 88 additions and 6 deletions
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src/wp-includes/post.php
+10
View File
@@ -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 );