braintree into flutter web using JS got this error "options.selector or options.container must reference a valid DOM node"

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Trying to implement Braintree payment gateway into flutter web. Still no SDK for flutter web from Braintree. So trying to implement their javascript SDK.

Here is my js file

function payment(auth){
    var button = document.querySelector('submit-button');
    console.log(auth);
    console.log(button);
    braintree.dropin.create({
      authorization: auth,
      container: 'dropin-container'
    }, function (createErr, instance) {
        console.log(createErr);
        console.log(instance);
         button.addEventListener('click', function () {
            instance.requestPaymentMethod(function (requestPaymentMethodErr, payload) {
              // Submit payload.nonce to your server
              return payload.nonce
            });
         });
    });
}

Calling this js function from dart. Here is the complete dart code.

@JS()
library my_script;

import 'dart:html';
import 'dart:js_util';

import 'package:carbonbins/model/model.dart';
import 'package:carbonbins/pages/navigation.gr.dart';
import 'package:carbonbins/utils/image_helper.dart';
import 'package:flutter/material.dart';
import 'dart:ui' as ui;

import 'package:js/js.dart';
import 'package:js/js.dart' as js;

@JS()
external void initBraintree(auth);

@JS()
external String payment(auth);

class PaymentPage extends StatefulWidget {
  final UserModel userModel;

  PaymentPage({@required this.userModel});

  @override
  _PaymentPageState createState() => _PaymentPageState();
}

class _PaymentPageState extends State<PaymentPage> {

  String auth = "sandbox_.....";

  void getButton() {
    var htmlL = """<div id="checkout-message"></div>
        <div id="dropin-container"></div>
    <button id="submit-button">Submit payment</button>""";

    // ignore: undefined_prefixed_name
    ui.platformViewRegistry.registerViewFactory(
        'payment-container',
        (int viewId) => DivElement()
          ..appendHtml(htmlL)
          ..style.border = 'none');

    print(HtmlElementView(
      viewType: "dropin-container",
    ));
  }

  void setupDropin() {
    print(auth);
    var status = payment(auth);
    print("Status: $status");
  }

  @override
  void initState() {
    getButton();
    setupDropin();
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        width: MediaQuery.of(context).size.width,
        child: Column(
          children: <Widget>[
            SizedBox(
              height: 100,
            ),
            Container(
              width: 500.0,
              height: 300.0,
              child: HtmlElementView(
                viewType: "payment-container",
              ),
            )
          ],
        ),
      ),
    );
  }

When I run this code, I see only the submit button in the screen. Got this error from web console, 

"options.selector or options.container must reference a valid DOM node."

How can I integrate the Braintree payment into the flutter web?

or any other international payment gateway that works in flutter web.

braintree flutter-web flutter javascript
1 Answers

Technical Disclaimer: flutter-web is in beta and I would not recommend it to be used with any payment service. This might lead to critical issues and not advisable.

The HtmlElementView widget adds all its elements into shadowdom which is not directly accessible for the global javascript context. Check this issue here in github.

The solution would be to pass the DivElement reference to the external js function. For e.g. in your case

Create the div element out side the build method and hold a reference, like in initSate


DivElement paymentDiv;

@override
initState(){

// always call before rest of the logic.
super.initState();

var htmlL = """<div id="checkout-message"></div>
        <div id="dropin-container"></div>
    <button id="submit-button">Submit payment</button>""";
paymentDiv=  DivElement()
          ..appendHtml(htmlL)
          ..style.border = 'none');
// remaining logic

}

Then in your build/other method pass this element for the registerViewFactory method.

// ignore: undefined_prefixed_name
    ui.platformViewRegistry.registerViewFactory(
        'payment-container',
        (int viewId) => paymentDiv;

Set you JS interop to accept dynamic parameter.

@JS()
external String payment(dynamic auth);

Rewrite you Javascript to directly work with this element reference. e.g

function payment(auth){
    var button = auth;
    // Remaining logic
}
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