programmare wordpress
Un semplice widget
Per creare un widget si deve estendere la casse di wordpress WP_Widget utilizzare l’hook widgets_init e registrarlo con register_widget
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<?php class My_Widget extends WP_Widget { function __construct() { parent::__construct( 'my-text', // Base ID 'My Text' // Name ); add_action( 'widgets_init', function() { register_widget( 'My_Widget' ); }); } public $args = array( 'before_title' => '<h4 class="widgettitle">', 'after_title' => '</h4>', 'before_widget' => '<div class="widget-wrap">', 'after_widget' => '</div></div>' ); public function widget( $args, $instance ) { echo $args['before_widget']; if ( ! empty( $instance['title'] ) ) { echo $args['before_title'] . apply_filters( 'widget_title', $instance['title'] ) . $args['after_title']; } echo '<div class="textwidget">'; echo esc_html__( $instance['text'], 'text_domain' ); echo '</div>'; echo $args['after_widget']; } public function form( $instance ) { $title = ! empty( $instance['title'] ) ? $instance['title'] : esc_html__( '', 'text_domain' ); $text = ! empty( $instance['text'] ) ? $instance['text'] : esc_html__( '', 'text_domain' ); ?> <p> <label for="<?php echo esc_attr( $this->get_field_id( 'title' ) ); ?>"><?php echo esc_html__( 'Title:', 'text_domain' ); ?></label> <input class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'title' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'title' ) ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>"> </p> <p> <label for="<?php echo esc_attr( $this->get_field_id( 'Text' ) ); ?>"><?php echo esc_html__( 'Text:', 'text_domain' ); ?></label> <textarea class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'text' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'text' ) ); ?>" type="text" cols="30" rows="10"><?php echo esc_attr( $text ); ?></textarea> </p> <?php } public function update( $new_instance, $old_instance ) { $instance = array(); $instance['title'] = ( !empty( $new_instance['title'] ) ) ? strip_tags( $new_instance['title'] ) : ''; $instance['text'] = ( !empty( $new_instance['text'] ) ) ? $new_instance['text'] : ''; return $instance; } } $my_widget = new My_Widget(); ?> |
Un widget per visualizzare i feed
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<?php // usa l'azione widgets_init hook per eseguire la funzione personalizzata add_action( 'widgets_init', 'boj_awe_register_widgets' ); //registra il nostro widget function boj_awe_register_widgets() { register_widget( 'boj_awe_widget'); } //boj_widget_my_info class class boj_awe_widget extends WP_Widget { //process the new widget function __construct () { $widget_ops = array( 'classname' => 'boj_awe_widget_class', 'description' => 'Display an RSS feed with options.' ); //$this->WP_Widget( 'boj_awe_widget', 'Advanced RSS Widget', $widget_ops ); parent::__construct('boj_awe_widget', 'Advanced RSS Widget', $widget_ops ); } //build the widget settings form function form($instance) { $defaults = array( 'title' => 'RSS Feed', 'rss_feed' => 'http://strangework.com/feed', 'rss_items' => '2' ); $instance = wp_parse_args( (array) $instance, $defaults ); $title = $instance['title']; $rss_feed = $instance['rss_feed']; $rss_items = $instance['rss_items']; $rss_date = $instance['rss_date']; $rss_summary = $instance['rss_summary']; ?> <p>Title: <input class="widefat" name=" <?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>" /></p> <p>RSS Feed: <input class="widefat" name="<?php echo $this->get_field_name( 'rss_feed' ); ?>" type="text" value="<?php echo esc_attr( $rss_feed ); ?>" /></p> <p>Items to Display: <select name="<?php echo $this->get_field_name('rss_items' ); ?>"> <option value="1" <?php selected( $rss_items, 1 ); ?>>1</option> <option value="2" <?php selected( $rss_items, 2 ); ?>>2</option> <option value="3" <?php selected( $rss_items, 3 ); ?>>3</option> <option value="4" <?php selected( $rss_items, 4 ); ?>>4</option> <option value="5" <?php selected( $rss_items, 5 ); ?>>5</option> </select> </p> <p>Show Date?: <input name=" <?php echo $this->get_field_name( 'rss_date' ); ?>" type="checkbox" <?php checked( $rss_date, 'on' ); ?> /></p> <p>Show Summary?: <input name=" <?php echo $this->get_field_name( 'rss_summary' ); ?>" type="checkbox" <?php checked( $rss_summary, 'on' ); ?> /></p> <?php } //save the widget settings function update($new_instance, $old_instance) { $instance = $old_instance; $instance['title'] = strip_tags( $new_instance['title'] ); $instance['rss_feed'] = strip_tags( $new_instance['rss_feed'] ); $instance['rss_items'] = strip_tags( $new_instance['rss_items'] ); $instance['rss_date'] = strip_tags( $new_instance['rss_date'] ); $instance['rss_summary'] = strip_tags( $new_instance['rss_summary'] ); return $instance; } //display the widget function widget($args, $instance) { extract($args); echo $before_widget; //load the widget settings $title = apply_filters( 'widget_title', $instance['title'] ); $rss_feed = empty( $instance['rss_feed'] ) ? '' : $instance['rss_feed']; $rss_items = empty( $instance['rss_items'] ) ? 2 : $instance['rss_items']; $rss_date = empty( $instance['rss_date'] ) ? 0 : 1; $rss_summary = empty( $instance['rss_summary'] ) ? 0 : 1; if ( !empty( $title ) ) { echo $before_title . $title . $after_title; }; if ( $rss_feed ) { //display the RSS feed wp_widget_rss_output( array( 'url' => $rss_feed, 'title' => $title, 'items' => $rss_items, 'show_summary' => $rss_summary, 'show_author' => 0, 'show_date' => $rss_date ) ); } echo $after_widget; } } ?> |
I Feed di un sito wordpress, si possono visualizzare con nomesito.com/feed
Per inserire un widget utilizzare la bacheca di wordpress Aspetto-> Widget e nella barra di ricerca ricercare il nome dato al plugin all’interno del construttore.
Per inserire informazioni del widget nella dashboard di wordpress, utilizzare il seguente codice
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function boj_dashboard ( ) { wp_add_dashboard_widget( 'dashboard_custom_feed', 'Mio dashboard personalizzato', 'boj_dashboard_example_display'); } function boj_dashboard_example_display(){ echo '<p>Contatta support@example.com per segnalare bug.</p>'; } |
Se si vuole far personalizzare il widget salvando delle opzioni add_option utilizzare un quarto parametro al wp_add_dashboard_widget