Taxonomy: Show error message for terms without a name.

Display an error message to users if they attempt to create a term without a name via the admin-ajax `add-tag` action. This improves the accessibility of the screen by avoiding the use of color alone to indicate an error.

Props conner_bw, birgire, afercia.
Fixes #47018.



git-svn-id: https://develop.svn.wordpress.org/trunk@53088 602fd350-edb4-49c9-b593-d223f7449a82

src/js/_enqueues/admin/tags.js

@@ -101,9 +101,6 @@ jQuery( function($) {
 	$('#submit').on( 'click', function(){
 		var form = $(this).parents('form');
 
-		if ( ! validateForm( form ) )
-			return false;
-
 		if ( addingTerm ) {
 			// If we're adding a term, noop the button to avoid duplicate requests.
 			return false;
@@ -127,8 +124,14 @@ jQuery( function($) {
 
 			$('#ajax-response').empty();
 			res = wpAjax.parseAjaxResponse( r, 'ajax-response' );
-			if ( ! res || res.errors )
+
+			if ( res.errors && res.responses[0].errors[0].code === 'empty_term_name' ) {
+				validateForm( form );
+			}
+
+			if ( ! res || res.errors ) {
 				return;
+			}
 
 			parent = form.find( 'select#parent' ).val();
 

src/wp-admin/includes/ajax-actions.php

@@ -1071,16 +1071,21 @@ function wp_ajax_add_tag() {
 	}
 
 	if ( ! $tag || is_wp_error( $tag ) ) {
-		$message = __( 'An error has occurred. Please reload the page and try again.' );
+		$message    = __( 'An error has occurred. Please reload the page and try again.' );
+		$error_code = 'error';
 
 		if ( is_wp_error( $tag ) && $tag->get_error_message() ) {
 			$message = $tag->get_error_message();
 		}
 
+		if ( is_wp_error( $tag ) && $tag->get_error_code() ) {
+			$error_code = $tag->get_error_code();
+		}
+
 		$x->add(
 			array(
 				'what' => 'taxonomy',
-				'data' => new WP_Error( 'error', $message ),
+				'data' => new WP_Error( $error_code, $message ),
 			)
 		);
 		$x->send();