'manage_' . screen . '_columns' filter not working

[arena]

in 3.0 i am using this filter to initialize the columns list in order to have them checkable with the "screen options" tab.

in 3.1 this do not work !

[scribu]

As I've said in #14651 (​http://core.trac.wordpress.org/ticket/14651#comment:11) you should be using register_column_headers() instead.

[arena]

Ok, but could you give a sample how to use your classes for an admin page plugin (list and page)

thank you

[scribu]

Sure.

Example class:

class Example_List_Table extends WP_List_Table {

	function __construct() {
		parent::WP_List_Table( array(
			'screen' => 'item',
			'plural' => 'items',
		) );
	}

	function prepare_items() {
		$this->items = get_items();

		$this->set_pagination_args( array(
			'total_items' => 100,
			'per_page' => 10
		) );
	}

	function get_columns() {
		return array(
			'cb'    => '<input type="checkbox" />',
			'name'  => 'Name',
			'color' => 'Color',
		);
	}

	function column_cb( $item ) {
		return '<input type="checkbox" name="delete_items[]" value="' . $item->id . '">';
	}

	function column_name( $item ) {
		return $item->name;
	}

	function column_color( $item ) {
		return $item->color;
	}

	function column_default( $item, $column_name ) {
		return apply_filters( "manage_items_custom_column", '', $column_name, $item->id );
	}
}

How you use it:

function example_init() {
  require dirname(__FILE__) . '/example-list-table.class.php';

  global $wp_list_table;

  $wp_list_table = new Example_List_Table;
}
add_action('admin_init', 'example_init');

// later...

$wp_list_table->prepare_items();
$wp_list_table->display();

Mockup get_items() function:

function get_items() {
	$items = array();

	$items[] = (object) array(
		'id' => 1,
		'name' => 'First item',
		'color' => 'red',
	);

	$items[] = (object) array(
		'id' => 2,
		'name' => 'Second item',
		'color' => 'green',
	);

	return $items;
}

Note: you don't need to re-open the ticket to leave a reply.

[scribu]

PS: Make sure you're at least at r15622

[nacin]

I'm afraid the loss of this filter will break existing plugins. It'll break mine as far as I can tell.

[scribu]

The filter is still there.

It just needs either register_column_headers() or a WP_List_Table instance called first.

[nacin]

Per discussion in IRC.

[scribu]

As a clarification, this only affects plugins that create completely new tables.

I.e., it still works for tables of posts, comments etc.

[scribu]

(In [15653]) Column headers revamp:

• undeprecate get_column_headers()
• undeprecate get_hidden_columns()
• in WP_List_Table, rename get_column_headers() to get_column_info()
• remove $taxonomy argument from single_row()
• merge manage_columns_prefs() into screen_meta()

Fixes #14952. Fixes #14776.

[nacin]

(In [15662]) Prevent the $title global from being stomped. Caused by merger of manage_columns_prefs() into screen_meta() in [15653]. see #14952, see #14776. The global is apparent cruft as the function doesn't use it.