我正在尝试在metabox中添加一个新字段。有一个演示url字段工作正常。我创建了一个新字段，该字段没有存储或保存插入该字段的任何数据。
这是我的大衣。
// Adding meta box for freebie custom post type
function demo_url_meta_box() {
add_meta_box(
\'demo_url_meta_box\',
__( \'Freebie Details\', \'\' ),
\'demo_url_meta_box_callback\',
\'freebie\',
\'normal\',
\'low\'
);
}
add_action( \'add_meta_boxes_freebie\', \'demo_url_meta_box\' );
// Callback function of metabox
function demo_url_meta_box_callback( $post ) {
// Add a nonce field so we can check for it later.
wp_nonce_field( \'demo_url_nonce\', \'demo_url_nonce\' );
// postmeta key: _demo_url
$demo_url = get_post_meta( $post->ID, \'_demo_url\', true );
?>
Enter freebie details such as URL of download and also demo URL
<table class="form-table">
<tbody>
<tr>
<th><label for="freebie-demo">Enter demo URL</label></th>
<td><input type="text" style="width:100%" id="freebie-demo" name="freebie-demo" value="<?php echo $demo_url; ?>"/></td>
</tr>
<tr>
<th><label for="freebie-downurl">Enter Download URL</label></th>
<td><input type="text" style="width:100%" id="freebie-downurl" name="freebie-downurl" /></td>
</tr>
</tbody>
</table>
<?php
}
/**
* When the post is saved, saves our custom data.
*
* @param int $post_id
*/
function save_demo_url_meta_box_data( $post_id ) {
// Check if our nonce is set.
if ( ! isset( $_POST[\'demo_url_nonce\'] ) ) {
return;
}
// Verify that the nonce is valid.
if ( ! wp_verify_nonce( $_POST[\'demo_url_nonce\'], \'demo_url_nonce\' ) ) {
return;
}
// If this is an autosave, our form has not been submitted, so we don\'t want to do anything.
if ( defined( \'DOING_AUTOSAVE\' ) && DOING_AUTOSAVE ) {
return;
}
// Check the user\'s permissions.
if ( isset( $_POST[\'post_type\'] ) && \'page\' == $_POST[\'post_type\'] ) {
if ( ! current_user_can( \'edit_page\', $post_id ) ) {
return;
}
}
else {
if ( ! current_user_can( \'edit_post\', $post_id ) ) {
return;
}
}
/* OK, it\'s safe for us to save the data now. */
// Make sure that it is set.
if ( ! isset( $_POST[\'freebie-demo\'] ) ) {
return;
}
// Sanitize user input.
$de_url = sanitize_text_field( $_POST[\'freebie-demo\'] );
// Update the meta field in the database.
update_post_meta( $post_id, \'_demo_url\', $de_url );
}
// add meta box data when save_post is hooked
add_action( \'save_post\', \'save_demo_url_meta_box_data\' );
