style(ngRequired): mark when invalid

Author: dimirc

src/select.css

@@ -6,6 +6,10 @@
 
 /* Select2 theme */
 
+/* Mark invalid Select2 */
+.ng-dirty.ng-invalid > a.select2-choice {
+    border-color: #D44950;
+}
 
 /* Selectize theme */
 
@@ -19,6 +23,11 @@
   width: 100%;
 }
 
+/* Mark invalid Selectize */
+.ng-dirty.ng-invalid > div.selectize-input {
+    border-color: #D44950;
+}
+
 
 /* Bootstrap theme */
 
@@ -61,3 +70,8 @@
 .ui-select-search.ng-hide-add {
     display: none !important;
 }
+
+/* Mark invalid Bootstrap */
+.ui-select-bootstrap.ng-dirty.ng-invalid > button.btn.ui-select-match {
+    border-color: #D44950;
+}