Improve Tom Select usability and accessibility defaults

contao/templates/frontend/event_filter.html.twig

@@ -31,7 +31,7 @@
         </div>
     </div>
 
-    <button type="button" id="eventfilter-reset" class="eventfilter-reset" hidden>Filter zurücksetzen</button>
+    <button type="button" id="eventfilter-reset" class="eventfilter-reset" aria-label="Alle Filter zurücksetzen" aria-controls="{{ targetEventListId|default('eventlist')|e('html_attr') }}" hidden>Filter zurücksetzen</button>
 
     <p id="eventfilter-status" class="visually-hidden" aria-live="polite"></p>
 </div>
@@ -69,19 +69,31 @@
     }
 
     #eventfilters .widget-select.active .ts-control {
-        outline: 2px solid currentColor;
-        outline-offset: 2px;
+        outline: 3px solid currentColor;
+        outline-offset: 3px;
     }
 
     #eventfilters .ts-control:focus-within {
-        outline: 2px solid currentColor;
-        outline-offset: 2px;
+        outline: 3px solid currentColor;
+        outline-offset: 3px;
     }
 
     #eventfilters .eventfilter-reset[hidden] {
         display: none;
     }
 
+    #eventfilters .ts-wrapper.single .ts-control {
+        background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath fill='none' stroke='%23343a40' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3E%3C/svg%3E");
+        background-repeat: no-repeat;
+        background-position: right 0.75rem center;
+        background-size: 16px 12px;
+        padding-right: 2rem;
+    }
+
+    #eventfilters .ts-wrapper.single .ts-control > input {
+        width: auto;
+    }
+
 </style>
 
 <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/tom-select@2.4.3/dist/css/tom-select.css">
@@ -124,11 +136,19 @@
         }
 
         return new window.TomSelect(selectElement, {
-            create: true,
+            create: false,
             sortField: {
                 field: 'text',
                 direction: 'asc',
             },
+            render: {
+                no_results() {
+                    return '<div class="no-results" role="option" aria-disabled="true">Keine Ergebnisse gefunden</div>';
+                },
+                no_more_results() {
+                    return '<div class="no-more-results" role="option" aria-disabled="true">Keine weiteren Ergebnisse</div>';
+                },
+            },
         });
     };