List Tables: Prevent Filter button submission and show admin notice when no filters are selected

src/js/_enqueues/admin/common.js

@@ -1330,7 +1330,53 @@ $( function() {
 			'bulk_action' : window.bulkActionObserverIds.bulk_action,
 			'changeit' : window.bulkActionObserverIds.changeit
 		};
-		if ( ! Object.keys( bulkFieldRelations ).includes( submitterName ) ) {
+
+		var filterButtonNames = [
+			window.bulkActionObserverIds.filter_action,
+			window.bulkActionObserverIds['post-query-submit']
+		];
+
+		if ( ! Object.keys( bulkFieldRelations ).includes( submitterName ) && ! filterButtonNames.includes( submitterName ) ) {
+			return;
+		}
+
+		if ( filterButtonNames.includes( submitterName ) ) {
+			var filterDropdowns = form.querySelectorAll( '.actions select' );
+			var isFilterActionValid = false;
+			var urlParams = new URLSearchParams( window.location.search );
+
+			for ( var i = 0; i < filterDropdowns.length; i++ ) {
+				var select = filterDropdowns[ i ];
+				if ( select.name === 'action' || select.name === 'action2' ) {
+					continue;
+				}
+				if ( select.value !== '0' && select.value !== '' && select.value !== '-1' ) {
+					isFilterActionValid = true;
+					break;
+				}
+				if ( urlParams.has( select.name ) ) {
+					isFilterActionValid = true;
+					break;
+				}
+			}
+
+			if ( isFilterActionValid ) {
+				return;
+			}
+
+			event.preventDefault();
+			event.stopPropagation();
+			$( 'html, body' ).animate( { scrollTop: 0 } );
+
+			var filterErrorMessage = __( 'Please select a filter to apply.' );
+			addAdminNotice( {
+				id: 'no-filter-selected',
+				type: 'error',
+				message: filterErrorMessage,
+				dismissible: true,
+			} );
+
+			wp.a11y.speak( filterErrorMessage );
 			return;
 		}
 

src/wp-includes/script-loader.php

@@ -767,8 +767,10 @@ function wp_default_scripts( $scripts ) {
 	$scripts->set_translations( 'common' );
 
 	$bulk_action_observer_ids = array(
-		'bulk_action' => 'action',
-		'changeit'    => 'new_role',
+		'bulk_action'       => 'action',
+		'changeit'          => 'new_role',
+		'filter_action'     => 'filter_action',
+		'post-query-submit' => 'post-query-submit',
 	);
 	did_action( 'init' ) && $scripts->localize(
 		'common',