Fix IE11 not able to submit (rjsf-team#1432)

* Fix rjsf-team#1431 - ie11 not able to submit * Fix code formatting * Add react-app-polyfill/ie11 for playground

Author: Marton Bodonyi

playground/app.js

@@ -5,6 +5,7 @@ import MonacoEditor from "react-monaco-editor";
 import { shouldRender } from "../src/utils";
 import { samples } from "./samples";
 import Form from "../src";
+import "react-app-polyfill/ie11";
 
 const log = type => console.log.bind(console, type);
 const toJson = val => JSON.stringify(val, null, 2);

src/components/Form.js

@@ -323,7 +323,11 @@ export default class Form extends Component {
 
  submit() {
  if (this.formElement) {
- this.formElement.dispatchEvent(new Event("submit", { cancelable: true }));
+ this.formElement.dispatchEvent(
+ new CustomEvent("submit", {
+ cancelable: true,
+ })
+ );
  }
  }