first upload all files

Modules/Admin/Resources/assets/js/Form.js

@@ -0,0 +1,20 @@
+export default class {
+    appendHiddenInput(form, name, value) {
+        $('<input>').attr({
+            type: 'hidden',
+            name: name ,
+            value: value,
+        }).appendTo(form);
+    }
+
+    appendHiddenInputs(form, name, values) {
+        for (let value of values) {
+            this.appendHiddenInput(form, name + '[]', value);
+        }
+    }
+
+    removeErrors() {
+        $('.has-error > .help-block').remove();
+        $('.has-error').removeClass('has-error');
+    }
+}