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--- programmieren:wordpress:klassische_metabox_fuer_posts_erstellen [2023/06/14 19:26] – jgehrke
+++ programmieren:wordpress:klassische_metabox_fuer_posts_erstellen [2024/08/10 10:38] (current) – jgehrke
@@ Line 4: / Line 4: @@
 <code php>
-/*
+<?php
-	METABOX EINKLINGEN
+/*  Metabox init */
- */
 new MetaboxPost();
 /**
- * SEITEN EIGENSCHAFTEN
+ * METABOX KLASSE
  */
 class MetaboxPost
@@ Line 23: / Line 22: @@
 	public function add_metabox()
 	{
-		$mb_id            = 'moewe_mb_post_marketo';
+		$mb_id            = 'plugin_metbox_name';
-		$mb_title         = 'Marketo Verbindung';
+		$mb_title         = 'Meine Metabox';
 		$mb_callback      = [ $this, 'render_metabox' ];
 		$mb_screens       = ['post','event'];
@@ Line 51: / Line 50: @@
 		// Update von einem Metafeld
 		//update_post_meta( $post_id, '_my_meta_value_key', $mydata );
+	}
+}
+</code>
+===== Alternative als statische Klasse =====
+Das hier ist eine alternative Version mit einer Klasse aus Static-Methods. Der Vorteil ist, dass diese nicht initialisiert werden muss, und wirklich nur aufgerufen wird, wenn Metaboxes von Wordpress gerendert werden.
+<code php>
+<?php
+namespace wp_admin\wp_metabox;
+add_action( 'add_meta_boxes', ['wp_admin\wp_metabox\MyMetaBox', 'add_metabox'] );
+add_action( 'save_post', ['wp_admin\wp_metabox\MyMetaBox', 'save'] );
+final class MyMetaBox
+{
+	private static $ID              = 'my_metabox_id';
+	private static $title           = 'My Metabox Title';
+	private static $render_callback = ['wp_admin\wp_metabox\MyMetaBox', 'render_metabox'];
+	private static $show_on_screens = [ 'post' ];
+	private static $position        = 'side';
+	private static $priority        = 'default';
+	public static function add_metabox()
+	{
+		add_meta_box( self::$ID, self::$title, self::$render_callback, self::$show_on_screens, self::$position, self::$priority );
+	}
+	public static function render_metabox()
+	{
+		echo "<h1>Mein lustiges HTML</h1>";
+	}
+	public static function save()
+	{
+		// Nichts machen bei Auto-Save
+		if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
+			return $post_id;
+		}
+		// Sanitizen von Eingaben
+		//$mydata = sanitize_text_field( $_POST['myplugin_new_field'] );
+		// Update von einem Metafeld
+		//update_post_meta( $post_id, '_my_meta_value_key', $mydata );
+	}
+}
+</code>
+===== Erweitertes Beispiel mit statischer Klasse =====
+In diesem Beispiel ist alles etwas konkreter. Es zeigt wie Daten aus einer Textarea gespeichert und geladen werden.
+Mit dieser Variante, kann man auf die gespeicherten Daten der Metabox auch direkt über die statische Methode zurück greifen, via:
+''$metabox_value_description = AdditionalPostInfos::get_description()''
+<code php>
+<?php
+ namespace theme\functions\theme_setup\metaboxes;
+add_action( 'add_meta_boxes', ['theme\functions\theme_setup\metaboxes\AdditionalPostInfos', 'add_metabox'] );
+add_action( 'save_post', ['theme\functions\theme_setup\metaboxes\AdditionalPostInfos', 'save'] );
+final class AdditionalPostInfos
+{
+	private static $ID              = 'mb_additional_post_infos';
+	private static $title           = 'Additional Post Infos';
+	private static $render_callback = ['theme\functions\theme_setup\metaboxes\AdditionalPostInfos', 'render_metabox'];
+	private static $show_on_screens = [ 'post' ];
+	private static $position        = 'side';
+	private static $priority        = 'high';
+	private static $entry_meta_key  = 'additional_post_infos';
+	public static function add_metabox()
+	{
+		add_meta_box( self::$ID, self::$title, self::$render_callback, self::$show_on_screens, self::$position, self::$priority );
+	}
+	public static function render_metabox()
+	{
+		$value_description = self::get_description();
+		echo <<<HTML
+			<div class="mb_additional_post_infos">
+				<label>
+					<strong>Descriptive Copy</strong>
+					<textarea type="text" name="additional_post_infos[description]" placeholder="add text here..." rows="3">{$value_description}</textarea>
+				</label>
+				<p><em>This will be displayed above the title on the blog post page.</em></p>
+			</div>
+			<style>
+				.mb_additional_post_infos label{
+					width : 100%;
+				}
+				.mb_additional_post_infos input{
+					width : 100%;
+				}
+				.mb_additional_post_infos textarea{
+					margin           : 2px 0px 0px 0px;
+					width            : 100%;
+					border           : none;
+					outline          : none;
+					border-radius    : 0px;
+					border-left      : 2px solid rgb(0,124,186,0.0);
+					background-color : rgb(245,245,245,1);
+					color            : rgb(90,90,90);
+					resize           : none;
+					transition       : border 250ms, background-color 250ms, color 250ms;
+					box-shadow       : none;
+				}
+					.mb_additional_post_infos textarea:hover{
+						border-left      : 2px solid rgb(0,124,186,0.5);
+						background-color : rgb(250,250,250,1);
+					}
+					.mb_additional_post_infos textarea:focus{
+						border           : none;
+						outline          : none;
+						border-left      : 2px solid rgb(0,124,186,1.0);
+						color            : rgb(0,0,0);
+						background-color : rgb(255,255,255,1);
+						box-shadow       : none;
+					}
+				.mb_additional_post_infos p em {
+					margin      : 4px 0px 0px 0px;
+					font-size   : 10px;
+					line-height : 12px;
+				}
+			</style>
+		HTML;
+	}
+	public static function save( $post_id )
+	{
+		// Nichts machen bei Auto-Save
+		if( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) return;
+		// Nichts tun, wenn gar kein Meta mit geschickt wurde
+		if( !isset( $_POST['additional_post_infos'] ) ) return;
+		update_post_meta( $post_id, 'additional_post_infos', $_POST['additional_post_infos'] );
+	}
+	public static function get_description():string
+	{
+		global $post;
+		$post_meta_description = get_post_meta( $post->ID, 'additional_post_infos',true )['description'] ?? '';
+		return $post_meta_description;
 	}
 }
 </code>

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