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Hi

Thank you for the reply. No, I don't submit any fields to frontend. I'm building a custom backend system to register data (of people), and I have multiple users and each have difference roles and capabilities. Some can only view part of data, and edit the other part - while other roles can edit all the fields - so I need a way to "control" which fields is uneditable.
As the 'disabled' and 'readonly' attributes is only controlled in frontend in the user's own browser, I can't ensure that they don't edit the attributes, allowing them to edit the fields they are not allowed to edit.
Thus, in this case my definition of "frontend" is actual WP admin backend, where users can either edit or read the difference fields.

I hope that it's to understand now? 🙂

Best
Troels

Perhaps you can apply the filter in the next update of Admin Columns, so I still in the future can filter the sortable_columns to add more custom columns which I want to being filtered 🙂

Thank you for the reply. But I can't make head or tail in the approach. Here is my code. How should I modify this to let me sort the "name" column?

<?php
class MM_Medlem_Custom_Admin_Columns extends MB_Admin_Columns_Post {
	/**
	 * MM_Medlem_Custom_Admin_Columns constructor.
	 */
	function __construct() {
		parent::__construct( 'mm_medlem', array() );
		add_action( 'pre_get_posts', array( $this, 'filter' ) );
	}

	public function columns( $columns ) {
		$columns = parent::columns( $columns );

		/**
		 * Add more column in a specific position
		 *
		 * @param string $position New column position. Empty to not specify the position. Could be 'before', 'after' or 'replace'
		 * @param string $target The target column. Used with combination with $position
		 */
		$position = 'after';
		$target   = 'mm_ddi-nr';
		$this->add( $columns, 'navn', 'Navn', $position, $target );

		return $columns;
	}

	public function show( $column, $post_id ) {
		switch ( $column ) {
			case 'navn':
				$navn = '';

				$fnavn = get_post_meta( $post_id, 'mm_fornavn', true );
				$mnavn = get_post_meta( $post_id, 'mm_mellemnavn', true );
				$enavn = get_post_meta( $post_id, 'mm_efternavn', true );

				$navn .= $fnavn;
				if ( $mnavn ) {
					$navn .= ' ' . $mnavn;
				}
				$navn .= ' ' . $enavn;

				echo $navn;
				break;
		}
	}

	function filter( $query ) {
		$query->set( 'orderby', 'mm_fornavn' );
		$query->set( 'order', 'ASC' );
	}
}