Get needed attribute working

Will cancel submit, shows validation message

api/js/etemplate/Validators/ManualMessage.ts

@@ -0,0 +1,16 @@
+import {ResultValidator} from "@lion/form-core";
+
+/**
+ * Manual validator for server-side validation messages passed
+ * from Etemplate.  It just gives whatever message is passed in when created.
+ *
+ */
+export class ManualMessage extends ResultValidator
+{
+	static validatorName = "ManualMessage";
+
+	static async getMessage({fieldName, modelValue, formControl, params})
+	{
+		return params;
+	}
+}