Feat: Custom error messages for Address lookup element.

Adding custom error messages to several subelements of the Address lookup
element.  This is for better UX.

Author: Adnan-cds

src/Element/AddressLookupElement.php

@@ -101,6 +101,7 @@ public static function processAddressLookupElement(&$element, FormStateInterface
       '#type' => 'textfield',
       '#title' => t('Postcode or street'),
       '#description' => $element['#address_search_description'] ?? t('Enter the postcode…'),
+      '#required_error' => t('You must enter a postcode or street.'),
       '#maxlength' => 64,
       '#size' => 64,
       '#weight' => '0',

src/Element/UKAddressLookup.php

@@ -59,6 +59,9 @@ public static function getCompositeElements(array $element) {
     $element_list['address_1']['#prefix'] = '<div class="js-address-entry-container">';
     $element_list['postcode']['#suffix'] = '</div>';
 
+    // Custom error message for address line 1.
+    $element_list['address_1']['#required_error'] = t('You must select an address.');
+
     // Extras to store information for webform builders to access in
     // computed twig.
     // @See DRUP-1287.
@@ -161,7 +164,7 @@ public static function validateWebformComposite(&$element, FormStateInterface $f
       // Then show an error to search for a local address or select can't find
       // the address.
       if (!empty($search_string) && $element['address_lookup']['address_select']['address_select_list']['#type'] == 'markup') {
-        $form_state->setError($element['address_lookup']['address_search']['address_searchstring'], t('Search for a local address, or select "Can\'t find the address" to enter an address.'));
+        $form_state->setError($element['address_lookup']['address_search']['address_searchstring'], t('Enter a local address, or select "Can\'t find the address".'));
 
         // Inline form errors don't work well for this element in Ajax calls.
         // This is because the Ajax callback attached to the `Find address`

src/Element/WebformUKAddress.php

@@ -65,6 +65,7 @@ public static function getCompositeElements(array $element) {
     $elements['town_city'] = [
       '#type' => 'textfield',
       '#title' => t('Town/City'),
+      '#required_error' => t('You must enter the town/city.'),
       '#attributes' => [
         'data-webform-composite-id' => $html_id . '--town_city',
         // Add a namespaced class for setting the address fields
@@ -78,6 +79,7 @@ public static function getCompositeElements(array $element) {
     $elements['postcode'] = [
       '#type' => 'textfield',
       '#title' => t('Postcode'),
+      '#required_error' => t('You must enter the postcode.'),
       '#attributes' => [
         'data-webform-composite-id' => $html_id . '--postcode',
         // Add a namespaced class for setting the address fields