I recently tried to use screen options for a wordpress backend plugin. I wanted to use a per page variable to be able to easily manage a number of users to request.
I first init the screen options :
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add_action('my_plugin_slug', array( $this, 'screen_set_option')); function screen_set_option() { add_screen_option('per_page', array( 'default'=>10, 'label'=>__('Users per page', 'my_domain'), 'option'=>'users_per_page')); } |
But then I couldn’t find a way to make the filter set-screen-option to work. This filter is used to filter a screen option value before it is set (https://developer.wordpress.org/reference/hooks/set-screen-option/).
I tried this code with no success :
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add_filter('set-screen-option', array($this, 'set_screen_option'), 10, 3); function FFP_set_screen_option($status, $option, $value) { if ( 'FFP_search_member_per_page' == $option ) { $user = get_current_user_id(); update_user_meta($user, 'users_per_page', $value); return $value; } return $value; } |
So I choose to save the screen option value after it was posted :
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// when rendering the page : $user=get_current_user_id(); $screen=get_current_screen(); if ( isset( $_POST['wp_screen_options'] ) &&is_array( $_POST['wp_screen_options'] ) ) { $option=$_POST['wp_screen_options']['option']; if ($option=='users_per_page') { $users_per_page=$_POST['wp_screen_options']['value']; update_user_meta($user, users_per_page', $users_per_page); apply_filters( 'set-screen-option', false, $option, $users_per_page ); } } else { $users_per_page=get_user_meta($user, 'users_per_page', true); if ( empty ( $users_per_page) ||$users_per_page<1 ) { $users_per_page=$screen->get_option( 'per_page', 'default' ); } else { apply_filters( 'set-screen-option', false, 'users_per_page', $users_per_page); } } |
Notice that I store the screen option value in the user meta table to be able to easily retrieved it.