Wie erstelle ich benutzerdefinierte Filteroptionen in wp_list_table?

Ich habe wp_list_tableKlasse verwendet, um meine benutzerdefinierte Tabelle im Backend zu erstellen. Es funktioniert gut.

Jetzt möchte ich Filter wie im folgenden Bild hinzufügen.

Hier ist mein vorhandener Code zum Rendern der Admin-Tabelle mit meinen benutzerdefinierten Informationen.

if( ! class_exists( 'WP_List_Table' ) ) {
    require_once( ABSPATH . 'wp-admin/includes/class-wp-list-table.php' );
}

class Kv_subscribers_list extends WP_List_Table {

    function __construct(){
        global $status, $page;                

        parent::__construct( array(
            'singular'  => 'notification',  
            'plural'    => 'notifications',   
            'ajax'      => false      
        ) );        
    }

    function column_default($item, $column_name){
        switch($column_name){
            case 'email':
            case 'date':
            case 'common':          
            case 'unit_id':          
                return $item[$column_name];
            default:
                return print_r($item,true); //Show the whole array for troubleshooting purposes
        }
    }

    function column_email($item){       
        $actions = array(
            'email'     => sprintf('<a href="?page=%s&action=%s&email_id=%s">E-mail</a>',$_REQUEST['page'],'email',$item['id']),
            'delete'    => sprintf('<a href="?page=%s&action=%s&delete_id=%s">Delete</a>',$_REQUEST['page'],'delete',$item['id']),
        );

        //Return the title contents
        return sprintf('%1$s %2$s',
            /*$1%s*/ $item['email'],          
            /*$2%s*/ $this->row_actions($actions)
        );
    }

    function column_cb($item){
        return sprintf(
            '<input type="checkbox" name="%1$s[]" value="%2$s" />',
            /*$1%s*/ $this->_args['singular'],  
            /*$2%s*/ $item['id']                
        );
    }

    function get_columns(){
        $columns = array(
            'cb'        => '<input type="checkbox" />', //Render a checkbox instead of text
            'email'=>__('Date'),  
            'date'=>__('Date'),  
            'common'=>__('Common Alert'),           
            'unit_id'=>__('Unique ID')
        );
        return $columns;
    }

   public function get_sortable_columns() {
        $sortable_columns = array(
            'email'   => array('wp_user_id',false),     //true means it's already sorted
            'date'    => array('date',false),
            'common'  => array('common',false)
        );
        return $sortable_columns;
    }

   public function get_bulk_actions() {
        $actions = array(
            'delete'    => 'Delete',
            'email'     => 'Email'
        );
        return $actions;
    }

   public function process_bulk_action() {
        global $wpdb; 
        $notifications_tbl = $wpdb->prefix.'newsletter';

        if( 'delete'===$this->current_action() ) {
            foreach($_POST['notification'] as $single_val){
                $wpdb->delete( $notifications_tbl, array( 'id' => (int)$single_val ) );             
            }
            $redirect_url =  get_admin_url( null, 'admin.php?page=subscribers' );
            wp_safe_redirect($redirect_url); 
            wp_die('Items deleted (or they would be if we had items to delete)!');
        } 
        if( 'email'===$this->current_action() ) {           
                $result_email_ar = implode("-",$_POST['notification']);
            $redirect_url =  get_admin_url( null, 'admin.php?page=kvcodes&ids='.$result_email_ar  );
            wp_safe_redirect($redirect_url);        

            wp_die('  ');
        }       
    }

    function prepare_items() {
        global $wpdb; //This is used only if making any database queries
        $database_name = $wpdb->prefix.'newsletter' ;
        $per_page = 10;
        $query = "SELECT * FROM $database_name ORDER BY id DESC";

        $columns = $this->get_columns();
        $hidden = array();
        $sortable = $this->get_sortable_columns();

        $this->_column_headers = array($columns, $hidden, $sortable);        

        $this->process_bulk_action();

        $data =  $wpdb->get_results($query, ARRAY_A );

        function usort_reorder($a,$b){
            $orderby = (!empty($_REQUEST['orderby'])) ? $_REQUEST['orderby'] : 'title'; //If no sort, default to title
            $order = (!empty($_REQUEST['order'])) ? $_REQUEST['order'] : 'asc'; //If no order, default to asc
            $result = strcmp($a[$orderby], $b[$orderby]); //Determine sort order
            return ($order==='asc') ? $result : -$result; //Send final sort direction to usort
        }
       // usort($data, 'usort_reorder');        

        $current_page = $this->get_pagenum();        

        $total_items = count($data);

        $data = array_slice($data,(($current_page-1)*$per_page),$per_page); 

        $this->items = $data;

        $this->set_pagination_args( array(
            'total_items' => $total_items,                  //WE have to calculate the total number of items
            'per_page'    => $per_page,                     //WE have to determine how many items to show on a page
            'total_pages' => ceil($total_items/$per_page)   //WE have to calculate the total number of pages
        ) );
    }
}//class

und

echo '<form method="post">';
    $mydownloads = new Kv_subscribers_list(); 
    echo '</pre><div class="wrap"><h2>Subscribers<a href="'."http://".$_SERVER["SERVER_NAME"].$_SERVER['REQUEST_URI'].'&add_new=true" class="add-new-h2">Add New</a></h2>'; 
    $mydownloads->prepare_items(); 
    $mydownloads->display(); 
    echo '</div></form>'; 

Jetzt möchte ich die Filter wie machen

Alle || Veröffentlicht || Müll

Ich muss einen benutzerdefinierten Filter wie diesen erstellen.

Code

class Kv_subscribers_list extends WP_List_Table {

function __construct(){
    global $status, $page;                

    parent::__construct( array(
        'singular'  => 'notification',  
        'plural'    => 'notifications',   
        'ajax'      => false      
    ) );        
}

protected function get_views() { 
    $status_links = array(
        "all"       => __("<a href='#'>All</a>",'my-plugin-slug'),
        "published" => __("<a href='#'>Published</a>",'my-plugin-slug'),
        "trashed"   => __("<a href='#'>Trashed</a>",'my-plugin-slug')
    );
    return $status_links;
}

function column_default($item, $column_name){
    switch($column_name){
        case 'email':
        case 'date':
        case 'common':          
        case 'unit_id':          
            return $item[$column_name];
        default:
            return print_r($item,true); //Show the whole array for troubleshooting purposes
    }
}

function column_email($item){       
    $actions = array(
        'email'     => sprintf('<a href="?page=%s&action=%s&email_id=%s">E-mail</a>',$_REQUEST['page'],'email',$item['id']),
        'delete'    => sprintf('<a href="?page=%s&action=%s&delete_id=%s">Delete</a>',$_REQUEST['page'],'delete',$item['id']),
    );

    //Return the title contents
    return sprintf('%1$s %2$s',
        /*$1%s*/ $item['email'],          
        /*$2%s*/ $this->row_actions($actions)
    );
}

function column_cb($item){
    return sprintf(
        '<input type="checkbox" name="%1$s[]" value="%2$s" />',
        /*$1%s*/ $this->_args['singular'],  
        /*$2%s*/ $item['id']                
    );
}

function get_columns(){
    $columns = array(
        'cb'        => '<input type="checkbox" />', 
        'email'=>__('Email'),  
        'date'=>__('Date'),  
        'common'=>__('Common Alert'),           
        'unit_id'=>__('Unique ID')
    );
    return $columns;
}
public function get_sortable_columns() {
    $sortable_columns = array(
        'email'   => array('wp_user_id',false),     //true means it's already sorted
        'date'    => array('date',false),
        'common'  => array('common',false)
    );
    return $sortable_columns;
}
public function get_bulk_actions() {
    $actions = array(
        'delete'    => 'Delete',
        'email'     => 'Email'
    );
    return $actions;
}

public function process_bulk_action() {

    global $wpdb; 
    $notifications_tbl = $wpdb->prefix.'newsletter';

    if( 'delete'===$this->current_action() ) {
        foreach($_POST['notification'] as $single_val){
            $wpdb->delete( $notifications_tbl, array( 'id' =>    (int)$single_val ) );             
        }
        $redirect_url =  get_admin_url( null, 'admin.php?page=subscribers' );
        wp_safe_redirect($redirect_url); 
        wp_die('Items deleted (or they would be if we had items to delete)!');
    } 
    if( 'email'===$this->current_action() ) {           
            $result_email_ar = implode("-",$_POST['notification']);
        $redirect_url =  get_admin_url( null, 'admin.php?page=kvcodes&ids='.$result_email_ar  );
        wp_safe_redirect($redirect_url);        

        wp_die('  ');
    }       
}

function prepare_items() {
    global $wpdb; //This is used only if making any database queries
    $database_name = $wpdb->prefix.'newsletter' ;
    $per_page = 10;
    $query = "SELECT * FROM $database_name ORDER BY id DESC";

    $columns = $this->get_columns();
    $hidden = array();
    $sortable = $this->get_sortable_columns();

    $this->_column_headers = array($columns, $hidden, $sortable);        

    $this->process_bulk_action();

    $data =  $wpdb->get_results($query, ARRAY_A );

    function usort_reorder($a,$b){
        $orderby = (!empty($_REQUEST['orderby'])) ? $_REQUEST['orderby'] : 'title'; //If no sort, default to title
        $order = (!empty($_REQUEST['order'])) ? $_REQUEST['order'] : 'asc'; //If no order, default to asc
        $result = strcmp($a[$orderby], $b[$orderby]); //Determine sort order
        return ($order==='asc') ? $result : -$result; //Send final sort direction to usort
    }
   // usort($data, 'usort_reorder');        

    $current_page = $this->get_pagenum();        

    $total_items = count($data);

    $data = array_slice($data,(($current_page-1)*$per_page),$per_page); 

    $this->items = $data;

    $this->set_pagination_args( array(
        'total_items' => $total_items,                  //WE have to calculate the total number of items
        'per_page'    => $per_page,                     //WE have to determine how many items to show on a page
        'total_pages' => ceil($total_items/$per_page)   //WE have to calculate the total number of pages
    ) );
}
}//class

Admin-Seite & Rendering-Beispiel

function o_add_menu_items(){
    add_menu_page('Plugin List Table', 'Sub', 'activate_plugins', 'subscribers', 'o_render_list_page');
} 
add_action('admin_menu', 'o_add_menu_items');

function o_render_list_page() {
    $mydownloads = new Kv_subscribers_list();
    $title = __("Subscribers","my_plugin_slug");
    ?>
    <div class="wrap">
        <h1>
            <?php echo esc_html( $title );?>
             <!-- Check edit permissions -->
             <a href="<?php echo admin_url( 'admin.php?page=subscribers&add_new=true' ); ?>" class="page-title-action">
                <?php echo esc_html_x('Add New', 'my-plugin-slug'); ?>
            </a>
            <?php
            ?>
        </h1>
    </div>
    <?php $mydownloads->views(); ?>
    <form method="post">
    <?php 

        $mydownloads->prepare_items(); 
        $mydownloads->display();
    ?>
    </form>
<?php
}

Erläuterung

Wir müssen die WP_List_TableKlassenmethode get_views überschreiben , um Statuslinks oben zu erhalten. Standardmäßig ist es ein leeres Array.

Die Views- Methode WP_List_Tableverwendet get_views , um eine Liste der Links anzuzeigen, die wir in get_views als assoziatives Array mit Trennzeichen zurückgeben |.

Wir können auch die Ansichtsmethode überschreiben , um mehr Kontrolle zu haben, beispielsweise wenn wir das Trennzeichen ändern möchten.

Schauen Sie sich an, wie andere Listentabellen das verwenden. Überprüfen Sie beispielsweise WP_Posts_List_Table .

Nachdem Sie die Methode überschrieben haben, platzieren Sie. $mydownloads->views();Stellen Sie sicher, dass Sie alle maskieren und Zeichenfolgen internationalisieren.

Filter verwenden

Wir können den views_{$this->screen->id}Filter verwenden, sobald wir die Methode get_views hinzugefügt haben . Angenommen toplevel_page_subscribersals Bildschirm-ID

add_filter('views_toplevel_page_subscribers','my_plugin_slug_status_links',10, 1);

function my_plugin_slug_status_links($views) {
   $views['scheduled'] =  "<a href='#'>Scheduled</a>";
   return $views;
}