Tworzę niestandardową tabelę WP_list_table z formularzem bocznym, takim jak (dodawanie nowego formularza kategorii), ale kiedy przesyłam ten formularz, wp_list_table nie odświeża się. Kiedy ponownie odświeżę stronę, pojawia się informacja o stronie. Używam wtyczki wp_list_table_example, wszystko jest takie samo, z wyjątkiem pobierania przykładowych danych i formularza.

 class TT_Example_List_Table extends WP_List_Table {

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

        //Set parent defaults
        parent::__construct( array(
            'singular'  => 'movie',     //singular name of the listed records
            'plural'    => 'movies',    //plural name of the listed records
            'ajax'      => false        //does this table support ajax?
        ) );

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

    function column_title($item){

        //Build row actions
        $actions = array(
            'edit'      => sprintf('<a href="https://wordpress.stackexchange.com/questions/220788/?page=%s&action=%s&movie=%s">Edit</a>',$_REQUEST['page'],'edit',$item['ID']),
            'delete'    => sprintf('<a href="https://wordpress.stackexchange.com/questions/220788/?page=%s&action=%s&movie=%s">Delete</a>',$_REQUEST['page'],'delete',$item['ID']),
        );

        //Return the title contents
        return sprintf('%1$s <span style="color:silver">(id:%2$s)</span>%3$s',
            /*$1%s*/ $item['title'],
            /*$2%s*/ $item['ID'],
            /*$3%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'],  //Let's simply repurpose the table's singular label ("movie")
            /*$2%s*/ $item['ID']                //The value of the checkbox should be the record's id
        );
    }

    function get_columns(){
        $columns = array(
            'cb'        => '<input type="checkbox" />', //Render a checkbox instead of text
            'title'     => 'Title',
            'rating'    => 'Rating',
        );
        return $columns;
    }

    function get_sortable_columns() {
        $sortable_columns = array(
            'title'     => array('title',false),     //true means it's already sorted
            'rating'    => array('rating',false),
            'director'  => array('director',false)
        );
        return $sortable_columns;
    }

    function get_bulk_actions() {
        $actions = array(
            'delete'    => 'Delete'
        );
        return $actions;
    }
    function process_bulk_action() {

        //Detect when a bulk action is being triggered...
        if( 'delete'===$this->current_action() ) {
            wp_die('Items deleted (or they would be if we had items to delete)!');
        }

    }
    function prepare_items() {


          $data = array();
        $example_data = array();
    $terms = get_terms( 'productcat', array('hide_empty' => false));

print_r($terms);
        if ( ! empty( $terms )  ){
     foreach ( $terms as $term ) {

         $data[] = array(
                            'ID'          =>  $term->term_id,
                            'title'       => $term->name
                            );

     }
 }

        $example_data = $data;

        $per_page = 5;


        $columns = $this->get_columns();
        $hidden = array();
        $sortable = $this->get_sortable_columns();
        $this->_column_headers = array($columns, $hidden, $sortable);
        $this->process_bulk_action();
        $data = $example_data;

        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
        ) );
    }


}


function tt_add_menu_items(){
    add_menu_page('Example Plugin List Table', 'List Table Example', 'activate_plugins', 'tt_list_test', 'tt_render_list_page');
} add_action('admin_menu', 'tt_add_menu_items');


function tt_render_list_page(){

    //Create an instance of our package class...
    $testListTable = new TT_Example_List_Table();
    //Fetch, prepare, sort, and filter our data...
    $testListTable->prepare_items();




    ?>
    <div class="wrap">

        <div id="icon-users" class="icon32"><br/></div>
        <h2>List Table Test</h2>

        <form id="movies-filter" method="GET">

            <!-- For plugins, we also need to ensure that the form posts back to our current page -->
            <input type="hidden" name="page" value="<?php echo $_REQUEST['page'] ?>" />
            <!-- Now we can render the completed list table -->
            <?php $testListTable->display(); ?>

        </form>
          <form id="insert_term" name="insert_term" method="post" action=""> 

           <div class="form-field  term-name-wrap">
          <label for="term">Term</label>
         <input type="text" value="" name="term" id="term" size="40" />
         <p>Description</p>
        </div>

    <label>Description</label><input type="text" value="" name="termdesc" id="termdesc" />

    <input type="submit" value="Add term" id="submit" name="submit" />
    <input type="hidden" name="action" value="new_term" />

</form> 

         <?php

if( 'POST' == $_SERVER['REQUEST_METHOD']) &&  $_POST['action'] == "new_term") {
if (isset($_POST['term']) && !empty( $_POST['term']) ) {

 $new_term =  $_POST['term'];
 $description = $_POST['desc'];
        wp_insert_term(
          $new_term,
          'productcat',
            array(
         'description'=> $description,
        ));

    } 

}

?>        
    </div>
    <?php
}

Moje pytanie brzmi: kiedy dodam w formularzu nowy termin, dlaczego nie odświeżyć wp_list_table, czy to ze względu na sposób uzyskiwania danych lub sposób dodawania danych. Jak odświeżyć wp_table_list po przesłaniu nowego terminu. Każda pomoc jest mile widziana.