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user/plugins/admin/themes/grav/app/utils/selectize-required-fix.js

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+/**
+ * This is a plugin to override the `.refreshValidityState` method of
+ * the Selectize library (https://selectize.github.io/selectize.js/).
+ * The library is not maintained anymore (as of 2017-09-13) and contains
+ * a bug which causes Microsoft Edge to not work with selectized [required]
+ * form fields. This plugin should be removed if
+ * https://github.com/selectize/selectize.js/pull/1320 is ever merged
+ * and a new version of Selectize gets released.
+ */
+
+import Selectize from 'selectize';
+
+Selectize.define('required-fix', function(options) {
+    this.refreshValidityState = () => {
+        if (!this.isRequired) return false;
+
+        let invalid = !this.items.length;
+        this.isInvalid = invalid;
+
+        if (invalid) {
+            this.$control_input.attr('required', '');
+            this.$input.removeAttr('required');
+        } else {
+            this.$control_input.removeAttr('required');
+            this.$input.attr('required');
+        }
+    };
+});