How to render a local HTML file with flutter dart webview

Question

I want to render a local HTML file stored in my phone memory in webview using flutter and dart.

you can use this https://stackoverflow.com/a/64875729/7760245 — Rasel Khan, Jan 21 '21 at 10:45

Suragch · Answer 1 · 2023-05-31T08:32:21.647

82

I'm using the webview_flutter plugin from the Flutter Team.

Steps

Add the dependency to pubspec.yaml:

dependencies:
  webview_flutter: ^4.2.1

Put an html file in the assets folder (see this). I'll call it help.html.
Declare it in your pubspec.yaml file:

flutter:
  assets:
    - assets/help.html

Use it in your code:

import 'package:flutter/material.dart';
import 'package:webview_flutter/webview_flutter.dart';

class HelpScreen extends StatefulWidget {
  const HelpScreen({super.key});

  @override
  State<HelpScreen> createState() => _HelpScreenState();
}

class _HelpScreenState extends State<HelpScreen> {
  late final WebViewController _controller;

  @override
  void initState() {
    super.initState();
    _controller = WebViewController();
    _controller.loadFlutterAsset('assets/help.html');
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: WebViewWidget(controller: _controller),
    );
  }
}

Notes

There are lots of other things you can do with a web view (including running JavaScript). Check out the following links for more:

Adding WebView to your Flutter app (official codelab)
Plugin example

edited May 31 '23 at 08:32

answered Mar 13 '19 at 18:50

Suragch

484,302
314
1,365
1,393

14

@Suragch How do I access local js file from html in webview? eg: `` – Arnold Parge Jan 03 '20 at 11:31
I am facing issue, while loading a .js file – Sanjay Kumar Aug 22 '20 at 05:57
@ArnoldParge I saw that you're trying to load Froala; I'm about to try the same thing. Were you able to get this to work? – jdixon04 Dec 14 '20 at 23:00
What about PDF ? How would you load a PDF ? – GoodSp33d Jun 19 '21 at 17:09
@GoodSp33d, You'd probably want to use a package for that. I haven't done it myself. – Suragch Jun 20 '21 at 23:45
`````` not working – Prashant Jun 26 '21 at 18:26
Can we use this `webview_flutter` for loading local html file in windows chrome browser – Mithson Sep 21 '21 at 08:08
I copy+pasted this code, didnt work. – João Martins Aug 12 '22 at 07:44
This code is out of date unfortunately. – Andrej May 25 '23 at 10:29
@Andrej, I've rewritten the answer so that it is up to date again. – Suragch May 31 '23 at 08:32

score 28 · Answer 2 · answered Dec 18 '18 at 11:41

You can pass a data URI

Uri.dataFromString('<html><body>hello world</body></html>', mimeType: 'text/html').toString()

or you can launch a web server inside Flutter and pass an URL that points to the IP/port the server serves the file from.

See also the discussion in https://github.com/fluttercommunity/flutter_webview_plugin/issues/23

See https://flutter.io/docs/development/ui/assets-and-images#loading-text-assets about how to load a string from assets.

See https://flutter.io/docs/cookbook/persistence/reading-writing-files for how to read other files.

encoding: Encoding.getByName('utf-8') would be also useful – K.Amanov Jun 07 '21 at 09:34 — K.Amanov, Jun 07 '21 at 09:34

score 17 · Answer 3 · edited Jun 01 '21 at 06:25

You may use Flutter InAppWebView Plugin. It will create a local server inside the app and it’ll run the HTML app there in the WebView. Start your server:

InAppLocalhostServer localhostServer = new InAppLocalhostServer();

Future main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await localhostServer.start();
  runApp(new MyApp());
}

//... ...

class _MyHomePageState extends State < MyHomePage > {

//... ...

  @override
  void dispose() {
    localhostServer.close();
    super.dispose();
  }
}

And then point your localhost html index file in the WebView.

InAppWebView(
  initialUrlRequest: URLRequest(
          url: Uri.parse('http://localhost:8080/assets/index.html')),
),

In many cases it doesn't work for many people because they forget to add all the folders as the assets in the pubspec.yaml file. For example, you need to specify all the folders and index file like below:

  assets:
    - assets/index.html
    - assets/css/
    - assets/images/
    - assets/js/
    - assets/others/

You can see this tutorial for further details.

Can it be done with html and css files downloaded from api? I tried, but, it only loads simple html, but no images or css. Seems like path issue, but found no solution so far. — Karanveer Singh, Apr 28 '22 at 11:25

score 14 · Answer 4 · edited Sep 29 '20 at 14:22

14

@Suragch, your code doesn't work as you posted it, it says localUrl was called on null. _loadHtmlFromAssets needs to be called after assigning the controller :

onWebViewCreated: (WebViewController webViewController) {
  _controller = webViewController;
  _loadHtmlFromAssets();
}

Then it works fine :)

edited Sep 29 '20 at 14:22

Yashwardhan Pauranik

5,370
5
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answered Jun 03 '19 at 14:19

Garbor

141
1
3

score 11 · Answer 5 · answered Oct 11 '19 at 02:39

I have the same problem; this is how I solved it.

Add webview_flutter to your project dependencies:

webview_flutter: 0.3.14+1
Create a WebViewController inside your screen/stateful widget

WebViewController _controller;
Implement the WebView and assign a value to the _controller using the onWebViewCreated property. Load the HTML file.

    WebView(
        initialUrl: '',
        onWebViewCreated: (WebViewController webViewController) async {
          _controller = webViewController;
          await loadHtmlFromAssets('legal/privacy_policy.html', _controller);
        },
      )

Implement the function to load the file from the asset folder

    Future<void> loadHtmlFromAssets(String filename, controller) async {
        String fileText = await rootBundle.loadString(filename);
        controller.loadUrl(Uri.dataFromString(fileText, mimeType: 'text/html', encoding: Encoding.getByName('utf-8')).toString());
    }

thanks but it seems to stop at this line String fileText = await rootBundle.loadString(filename); — 68060, Nov 16 '21 at 03:52

score 6 · Answer 6 · answered Nov 30 '19 at 18:21

You can use my plugin flutter_inappwebview, which has a lot of events, methods, and options compared to other plugins!

To load an html file from your assets folder, you need to declare it in the pubspec.yaml file before use it (see more here).

Example of a pubspec.yaml file:

...

# The following section is specific to Flutter.
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  assets:
    - assets/index.html

...

After that, you can simply use the initialFile parameter of the InAppWebView widget to load index.html into the WebView:

import 'dart:async';

import 'package:flutter/material.dart';

import 'package:flutter_inappwebview/flutter_inappwebview.dart';

Future main() async {
  runApp(new MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => new _MyAppState();
}

class _MyAppState extends State<MyApp> {

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

  @override
  void dispose() {
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        home: InAppWebViewPage()
    );
  }
}

class InAppWebViewPage extends StatefulWidget {
  @override
  _InAppWebViewPageState createState() => new _InAppWebViewPageState();
}

class _InAppWebViewPageState extends State<InAppWebViewPage> {
  InAppWebViewController webView;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
            title: Text("InAppWebView")
        ),
        body: Container(
            child: Column(children: <Widget>[
              Expanded(
                child: Container(
                  child: InAppWebView(
                    initialFile: "assets/index.html",
                    initialHeaders: {},
                    initialOptions: InAppWebViewWidgetOptions(
                      inAppWebViewOptions: InAppWebViewOptions(
                        debuggingEnabled: true,
                      ),
                    ),
                    onWebViewCreated: (InAppWebViewController controller) {
                      webView = controller;
                    },
                    onLoadStart: (InAppWebViewController controller, String url) {

                    },
                    onLoadStop: (InAppWebViewController controller, String url) {

                    },
                  ),
                ),
              ),
            ]))
    );
  }
}

Is it working with large(3-5Mb) html strings (via loadData)? Does it support inner href links (Title1) inside these pages? — iBog, May 18 '20 at 10:29

缘去皆空 · Answer 7 · 2019-08-09T02:42:46.300

2

unzip the apk package,I found the reason: path is wrong;

For Android:

"assets/test.html" == "file:///android_asset/flutter_assets/assets/test.html"

so,just like this:

WebView(
    initialUrl: "file:///android_asset/flutter_assets/assets/test.html",
    javascriptMode: JavascriptMode.unrestricted,
  )

you can load "assets/test.html".

edited Aug 09 '19 at 02:42

answered Aug 09 '19 at 02:34

缘去皆空

133
4

7

Bad solution for multiplatform Flutter – AlexeyVMP Aug 29 '19 at 11:39
1

Just for Android，It is useful for me – 缘去皆空 Sep 03 '19 at 01:55
works ok on android, but for ios ? – IulianT Jan 05 '22 at 12:09

score 1 · Answer 8 · answered May 15 '21 at 17:40

1

The asset_webview plugin is specifically designed for this. Fewer features than other plugins, but simple to use.

answered May 15 '21 at 17:40

David Green

874
7
5

score 1 · Answer 9 · answered May 06 '22 at 07:59

Finally found a proper way


    String webview_content = '''
     <!DOCTYPE html>
     <html lang="en">
     <head>
     <title>Load file or HTML string example</title>
     </head>
     <body>

     <h1>Local demo page</h1>
     <p>
      This is an example page used to demonstrate how to load a local file 
      or 
      HTML 
      string using the <a 
      href="https://pub.dev/packages/webview_flutter">Flutter 
      webview</a> plugin.
     </p>

    </body>
    </html>
    ''';

   final Completer<WebViewController> _controller =
        Completer<WebViewController>();

    Future<void> _loadHtmlString(
        Completer<WebViewController> controller, BuildContext context) async {
      WebViewController _controller = await controller.future;
      await _controller.loadHtmlString(webview_content);

    return WebView(
     initialUrl: 'https://flutter.dev',
     onWebViewCreated:
     (WebViewController webViewController) async {
     _controller.complete(webViewController);
     _loadHtmlString(_controller, context);
},
),

score 1 · Answer 10 · answered Mar 22 '23 at 19:29

You can use webview_flutter plugin in this case

Add webview_flutter to your dependencies

dependencies:
  webview_flutter: ^4.0.7

Make sure to declare your HTML file as an asset in the pubspec.yaml file

assets:
  - assets/index.html

Instantiate a WebViewController and load your HTML file using loadFlutterAsset() method

final controller = WebViewController()..loadFlutterAsset('assets/index.html');

Finally pass the above instantiated controller to WebViewWidget

WebViewWidget(
  controller: controller
)

Also, in place of loadFlutterAsset() method, you can use methods like loadHtmlString() to load HTML from a String or loadFile() to load the HTML file located on the device (Refer docs for more information).

I hope this solves your problem

Rasel Khan · Answer 11 · 2022-05-07T04:28:09.257

0

Use flutter_widget_from_html_core---->

link -> https://pub.dev/packages/flutter_widget_from_html_core

dependencies:
  flutter_widget_from_html_core: ^0.5.1+4

Code like this

HtmlWidget(
     """
               <html lang="en">
                <body>hello world</body>
               </html>
          """,
    ),

edited May 07 '22 at 04:28

answered Nov 17 '20 at 12:57

Rasel Khan

2,976
19
25

1

In my opinion this does not answer, since he mentioned he wants to render a local file. Nothing about it is in this answer. – Iván Yoed Sep 23 '21 at 15:31

Cong-Binh Le · Answer 12 · 2022-11-23T10:31:55.067

I follow @Suragch answer and find that local image path in the html file cannot be loaded. So I tried a few ways and found that replacing the method loadUrl() with loadFlutterAsset() actually do the job (the code is also more simple).

class UserGuidePage extends StatefulWidget {
  final UserGuideArguments arguments;

  const UserGuidePage({required this.arguments, Key? key}) : super(key: key);

  @override
  State<UserGuidePage> createState() => _UserGuidePageState();
}

class _UserGuidePageState extends State<UserGuidePage> {
  late WebViewController _controller;

  @override
  Widget build(BuildContext context) {
    return WebView(
      initialUrl: 'about:blank',
      onWebViewCreated: (WebViewController webViewController) {
      _controller = webViewController;
      _loadHtmlFromAssets();
    },
   );
  }

  void _loadHtmlFromAssets() {
    _controller.loadFlutterAsset('assets/index.html');
  }
}

score -1 · Answer 13 · answered Jul 18 '21 at 08:24

You can get the page html and use it to load the page with code below that is an example

    import 'dart:convert';

import 'package:aws_bot/Utils/Const.dart';
import 'package:aws_bot/Utils/User.dart';
import 'package:flutter/material.dart';
import 'package:flutter_inappwebview/flutter_inappwebview.dart';
import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';
import 'package:html/parser.dart';

class signIn extends StatefulWidget {
  const signIn({Key? key}) : super(key: key);

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

class _signInState extends State<signIn> {
  String userEmail = "";
  String userPassword = "";
  final flutterWebviewPlugin = new FlutterWebviewPlugin();
  bool evalJsOnce = false;
  String _currentUrl = "";

  User _user = User();
  bool _loading = true;
  double progress = 0.0;

  @override
  void initState() {
    super.initState();
    // Future.delayed(Duration(microseconds: 3), () async {
    //   Map info = await _user.getEmailPassword();
    //   _user.userEmail = info['email'];
    //   _user.userPassword = info['password'];
    //   setState(() {});
    // });
  }

  @override
  Widget build(BuildContext context) {
    flutterWebviewPlugin.onProgressChanged.listen((double progress) {
      print("progress changed = $progress");
      if (progress == 1.0) {
        //https://portal.aws.amazon.com/billing/signup
        flutterWebviewPlugin.onUrlChanged.listen((String url) {
          _currentUrl = url;
          print("url changed = $url");
          if (url.contains('https://portal.aws.amazon.com/billing/signup')) {
            print("signup");
            flutterWebviewPlugin.evalJavascript(''
                'document.querySelector("#CredentialCollection").addEventListener("submit", function(e) {window.Mchannel.postMessage(JSON.stringify({"email": document.querySelector("#awsui-input-0").value, "password": document.querySelector("#awsui-input-1").value, "confirmPass": document.querySelector("#awsui-input-2").value, "accountName": document.querySelector("#awsui-input-3").value}));});');
          } else {
            flutterWebviewPlugin.evalJavascript(''
                'let pageHtml = document.documentElement.innerHTML;'
                'window.Emailchannel.postMessage(pageHtml);'
                'if (pageHtml.includes("Root user email address")) {'
                'document.querySelector("#next_button").addEventListener("click", function(e) {window.Emailchannel.postMessage(JSON.stringify({"email": document.querySelector("#resolving_input").value}));});}'
                '');
          }
          // } else if (url.contains(
          //     'https://signin.aws.amazon.com/signin?redirect_uri=https%3A%2F%2Fconsole.aws.amazon.com%2Fconsole%2Fhome%3Ffromtb%3Dtrue%26hashArgs%3D%2523%26isauthcode%3Dtrue%26state%3DhashArgsFromTB_us-east-1_2b2a9061808657b8&client_id=arn%3Aaws%3Asignin%3A%3A%3Aconsole%2Fcanvas&forceMobileApp=0&code_challenge=-HEkj8kWzXDv2qBLcBQX2GYULvcP2gsHr0p0X_fJJcU&code_challenge_method=SHA-256')) {
          //   flutterWebviewPlugin.evalJavascript(''
          //       'document.querySelector("#next_button").addEventListener("click", function(e) {e.preventDefault(); window.Emailchannel.postMessage(JSON.stringify({"email": document.querySelector("#resolving_input").value}));});;');
          // } else if (url.contains(
          //     "https://signin.aws.amazon.com/signin?redirect_uri=https%3A%2F%2Fconsole.aws.amazon.com%2Fconsole%2Fhome%3Ffromtb%3Dtrue%26hashArgs%3D%2523%26isauthcode%3Dtrue%26state%3DhashArgsFromTB_us-east-1_c885b81ed0514ab4&client_id=arn%3Aaws%3Asignin%3A%3A%3Aconsole%2Fcanvas&forceMobileApp=0&code_challenge=_Tqr3pEXTDAqOYjWp0ehE6ToYYSN7OLeyJWBx5HTPVM&code_challenge_method=SHA-256")) {
          //   print("enter pass");
          //   // flutterWebviewPlugin.evalJavascript(''
          //   //     'document.querySelector("#signin_button").addEventListener("click", function(e) {e.preventDefault(); window.Passwordchannel.postMessage(JSON.stringify({"password": document.querySelector("#password").value}));});;');
          // } else if (url.contains("https://console.aws.amazon.com/")) {
          //   // flutterWebviewPlugin.launch(_consts.successDirectUrl +
          //   //     "email=${_user.userEmail}&password=${_user.userPassword}");
          // }
        });
      }
    });

    flutterWebviewPlugin.onStateChanged.listen((WebViewStateChanged state) {
      print("state changed = $state");
    });

    return Scaffold(
      appBar: AppBar(
        title: Text(
          'AWS Sign In',
          style: TextStyle(color: Colors.black),
        ),
        backgroundColor: Colors.yellow[600],
      ),
      floatingActionButton: _backButton(context),
      body: Column(
        children: [
          (progress != 1.0)
              ? LinearProgressIndicator(
                  // minHeight: 10.0,
                  value: progress,
                  backgroundColor: Colors.redAccent,
                  valueColor: AlwaysStoppedAnimation<Color>(Colors.black))
              : Container(),
          Container(
              color: Colors.yellow[600],
              width: double.infinity,
              padding: EdgeInsets.all(8.0),
              child: Column(
                mainAxisAlignment: MainAxisAlignment.start,
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    "Email Address of you AWS : ${consts.user.userEmail}",
                    style: TextStyle(
                      fontWeight: FontWeight.w600,
                    ),
                  ),
                  SizedBox(
                    height: 4.0,
                  ),
                  Text(
                    "IAM user name : ${consts.user.accountName}",
                    style: TextStyle(
                      fontWeight: FontWeight.w600,
                    ),
                  ),
                  SizedBox(
                    height: 4.0,
                  ),
                  Text(
                    "Password : ${consts.user.userPassword != "null" && consts.user.userPassword != "" ? consts.user.userPassword.replaceAll(consts.user.userPassword, "******") : ""}",
                    style: TextStyle(
                      fontWeight: FontWeight.w600,
                    ),
                  ),
                ],
              )),
          Expanded(child: _buildSignInPage()),
        ],
      ),
    );
  }

  _buildSignInPage() {
    String _url = "https://console.aws.amazon.com/iam/home#/users";
    return InAppWebView(
      initialUrlRequest: URLRequest(url: Uri.parse(_url)),
      // javascriptChannels: Set.from([
      //   JavascriptChannel(
      //       name: 'Emailchannel',
      //       onMessageReceived: (JavascriptMessage message) {
      //         //This is where you receive message from
      //         //javascript code and handle in Flutter/Dart
      //         //like here, the message is just being printed
      //         //in Run/LogCat window of android studio
      //         print("console message = ${message.message}");
      //         setState(() {
      //           _user.userEmail =
      //               jsonDecode(message.message)['email'].toString();
      //         });
      //       }),
      //   JavascriptChannel(
      //       name: 'Passwordchannel',
      //       onMessageReceived: (JavascriptMessage message) {
      //         //This is where you receive message from
      //         //javascript code and handle in Flutter/Dart
      //         //like here, the message is just being printed
      //         //in Run/LogCat window of android studio
      //         print("console message = ${jsonDecode(message.message)}");
      //         setState(() {
      //           _user.userEmail =
      //               jsonDecode(message.message)['password'].toString();
      //         });
      //       })
      // ]),
      // withJavascript: true,
      onConsoleMessage: (controller, consoleMessage) async {
        print("console message = ${consoleMessage.message}");
        print(consoleMessage.messageLevel.toString());
        // LOG ERROR => message levels
        if (consoleMessage.messageLevel.toString() != "ERROR" &&
            consoleMessage.messageLevel.toString() != "WARNING") {
          Map message = jsonDecode(consoleMessage.message);
          if (message.containsKey("email")) {
            consts.user.userEmail = message['email'].toString();
            await consts.user.storeSignUpInfo(email: consts.user.userEmail);
          } else if (message.containsKey("password")) {
            consts.user.userPassword = message['password'].toString();
            await consts.user
                .storeSignUpInfo(password: consts.user.userPassword);
          } else if (message.containsKey("delete")) {
            Future.delayed(Duration.zero, () async {
              await consts.user.clearStorage();
              consts.user.userEmail = "";
              consts.user.userPassword = "";
            });
          } else if (message.containsKey("sEmail")) {
            consts.user.userEmail = message['sEmail'].toString();
            await consts.user.storeSignUpInfo(email: consts.user.userEmail);
          } else if (message.containsKey("sPassword")) {
            consts.user.userPassword = message["sPassword"].toString();
            await consts.user
                .storeSignUpInfo(password: consts.user.userPassword);
          } else if (message.containsKey("sAccountName")) {
            consts.user.accountName = message["sAccountName"].toString();
            await consts.user
                .storeSignUpInfo(accountName: consts.user.accountName);
          } else if (message.containsKey("sFullName")) {
            consts.user.fullName = message["sFullName"].toString();
            await consts.user.storeSignUpInfo(fullName: consts.user.fullName);
          } else if (message.containsKey("sPhone")) {
            consts.user.phoneNumber = message["sPhone"].toString();
            await consts.user
                .storeSignUpInfo(phoneNumber: consts.user.phoneNumber);
          } else if (message.containsKey("sRegion")) {
            consts.user.region = message["sRegion"].toString();
            await consts.user.storeSignUpInfo(region: consts.user.region);
          } else if (message.containsKey("sAddress")) {
            consts.user.address = message["sAddress"].toString();
            await consts.user.storeSignUpInfo(address: consts.user.address);
          } else if (message.containsKey("sCity")) {
            consts.user.city = message["sCity"].toString();
            await consts.user.storeSignUpInfo(city: consts.user.city);
          } else if (message.containsKey("sState")) {
            consts.user.state = message["sState"].toString();
            await consts.user.storeSignUpInfo(state: consts.user.state);
          } else if (message.containsKey("sPostal")) {
            consts.user.postalCode = message["sPostal"].toString();
            await consts.user
                .storeSignUpInfo(postalCode: consts.user.postalCode);
          } else if (message.containsKey("sOrganize")) {
            consts.user.oraganization = message["sOrganize"].toString();
            await consts.user
                .storeSignUpInfo(organization: consts.user.oraganization);
          }

          setState(() {
            if (consts.user.userPassword != "" &&
                !message.containsKey("delete")) {
              /*Future.delayed(Duration.zero, () async {
                await consts.user.storeEmailAndPassword(
                    consts.user.userEmail, consts.user.userPassword);
                // controller.loadUrl(
                //     urlRequest: URLRequest(
                //         url: Uri.parse(_consts.successDirectUrl +
                //             "email=${_user.userEmail}&password=${_user.userPassword}")));
              });*/
            }
          });
        }
      },
      onWindowFocus: (controller) async {
        var currentUrl = await controller.getUrl();
        final html = await controller.getHtml();
        var document = parse(html);
        if (currentUrl != _currentUrl) {
          Future.delayed(Duration.zero, () async {
            var htmlCode = await controller.getHtml();
            var document = parse(htmlCode);
            var currentUrl = await controller.getUrl();
            print("currentUrl = ${currentUrl}");
            if (document.body!.innerHtml.contains("username@example.com")) {
              print("get email");
              await consts.user.clearStorage();

              // get entered email address
              getUserEmail(controller, document.body!.innerHtml);
            } else if (document.body!.innerHtml.contains("Root user sign in")) {
              print("get pass");
              // get entered password
              getUserPassword(controller, document.body!.innerHtml);
            } else if (currentUrl
                .toString()
                .contains("https://portal.aws.amazon.com/billing/signup")) {
              if (document.body!.innerHtml.contains("AWS account name")) {
                print("sign up");
                // get signUp email
                getSignUpEmail(controller);
                // get signUp password
                getSignUpPassword(controller);
                // get signUp account name
                getSignUpAccountName(controller);
              } else if (document.body!.innerHtml
                  .contains("Contact Information")) {
                // get full name
                getSignUpFullname(controller);
                // get phone number
                getSignUpPhoneNumber(controller);
                // get region
                getSignUpRegion(controller);
                // get address
                getSignUpAddress(controller);
                // get city
                getSignUpCity(controller);
                // get state
                getSignUpState(controller);
                // get postal code
                getSignUpPostalCode(controller);
                // get organization
                getSignUpOrganization(controller);
              }
            }
          });
        }
        _currentUrl = currentUrl.toString();
        //controller.goBack();
      },
      onProgressChanged:
          (InAppWebViewController controller, int progress) async {
        setState(() {
          this.progress = progress / 100;
          print("progress = ${this.progress}");
        });
        if (progress == 100) {
          var currentUrl = await controller.getUrl();

          Future.delayed(Duration(microseconds: 3), () async {
            var htmlCode = await controller.getHtml();
            var document = parse(htmlCode);

            print("currentUrl progress = ${currentUrl.toString()}");
            //print("html = ${document.body!.innerHtml}");
            if (document.body!.innerHtml
                .contains("Email address of your AWS account")) {
              print("get email");
              await consts.user.clearStorage();
              consts.user.userEmail = "";
              consts.user.userPassword = "";
              controller.evaluateJavascript(source: """
                   document.querySelector("#new_account_container").style.display = "none";
            """);
              setState(() {});

              // get entered email address
              getUserEmail(controller, document.body!.innerHtml);
            } else if (document.body!.innerHtml.contains("Root user sign in")) {
              print("get pass");
              // get entered password
              getUserPassword(controller, document.body!.innerHtml);
            } else if (currentUrl
                .toString()
                .contains("https://portal.aws.amazon.com/billing/signup#/")) {
              if (document.body!.innerHtml.contains("AWS account name")) {
                print("sign up progress");
                // get signUp email
                getSignUpEmail(controller);
                // get signUp password
                getSignUpPassword(controller);
                // get signUp account name
                getSignUpAccountName(controller);
              } else if (document.body!.innerHtml
                  .contains("Contact Information")) {
                // get full name
                getSignUpFullname(controller);
                // get phone number
                getSignUpPhoneNumber(controller);
                // get region
                getSignUpRegion(controller);
                // get address
                getSignUpAddress(controller);
                // get city
                getSignUpCity(controller);
                // get state
                getSignUpState(controller);
                // get postal code
                getSignUpPostalCode(controller);
                // get organization
                getSignUpOrganization(controller);
              }
            }
            if (currentUrl.toString() ==
                    "https://console.aws.amazon.com/iam/home#/users" ||
                currentUrl.toString() ==
                    "https://console.aws.amazon.com/iam/home?#/users") {
              print("delete credentials");
              // delete user data if loged out
              deleteCredentials(controller);
            }
          });
        }
      },
    );
  }

  // get user amil
  getUserEmail(InAppWebViewController controller, String html) {
    controller.addJavaScriptHandler(
        handlerName: 'EmailGetter',
        callback: (args) {
          // print arguments coming from the JavaScript side!
          print("email args = $args");
          // return data to the JavaScript side!
          return args;
        });
    controller.evaluateJavascript(source: """
            document.querySelector("#next_button").addEventListener("click", function(ee) {
            window.console.log(JSON.stringify({"email": document.querySelector("#resolving_input").value}));});
            """);
  }

  // getting password
  getUserPassword(InAppWebViewController controller, String html) {
    controller.evaluateJavascript(source: """
            document.querySelector("#signin_button").addEventListener("click", function(ee) {
            window.console.log(JSON.stringify({"password": document.querySelector("#password").value}));});
            """);
  }

  // getting SignUp Email address
  getSignUpEmail(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#CredentialCollection").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sEmail": document.querySelector("input[name='email']").value}));});
            """);
  }

  // getting SignUp password
  getSignUpPassword(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#CredentialCollection").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sPassword": document.querySelector("input[name='password']").value}));});
            """);
  }

  // getting SignUp account name
  getSignUpAccountName(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#CredentialCollection").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sAccountName": document.querySelector("input[name='accountName']").value}));});
            """);
  }

  // getting SignUp fullName
  getSignUpFullname(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#ContactInformation").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sFullName": document.querySelector("input[name='address.fullName']").value}));});
            """);
  }

  // getting SignUp phone number
  getSignUpPhoneNumber(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#ContactInformation").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sPhone": document.querySelector("input[name='address.phoneNumber']").value}));});
            """);
  }

  // getting SignUp region
  getSignUpRegion(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#ContactInformation").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sRegion": document.querySelectorAll(".awsui-select-trigger-label")[1].innerText}));});
            """);
  }

  // getting SignUp address
  getSignUpAddress(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#ContactInformation").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sAddress": document.querySelectorAll("input[name='address.addressLine1']").value}));});
            """);
  }

  // getting SignUp city
  getSignUpCity(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#ContactInformation").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sCity": document.querySelectorAll("input[name='address.city']").value}));});
            """);
  }

  // getting SignUp state
  getSignUpState(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#ContactInformation").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sState": document.querySelectorAll("input[name='address.state']").value}));});
            """);
  }

  // getting SignUp postal code
  getSignUpPostalCode(controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#ContactInformation").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sPostal": document.querySelectorAll("input[name='address.postalCode']").value}));});
            """);
  }

  // getting SignUp organization
  getSignUpOrganization(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#ContactInformation").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sOrganize": document.querySelectorAll("input[name='address.company']").value}));});
            """);
  }

  // deleting user credentials
  deleteCredentials(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#aws-console-logout").addEventListener("click", function(ee) {
            window.console.log(JSON.stringify({"delete": "delete"}));});
            """);
  }

  _backButton(BuildContext context) {
    return ElevatedButton(
      onPressed: () {
        Navigator.pop(context);
      },
      child: Icon(Icons.arrow_back),
    );
  }
}

You should remove the comments and maybe split your code in more logical blocks — Philipos D., Dec 22 '21 at 12:27

score -1 · Answer 14 · answered Dec 22 '21 at 13:55

Here is much more cleaner code of above code

import 'dart:convert';

import 'package:aws_bot/Utils/Const.dart';
import 'package:aws_bot/Utils/User.dart';
import 'package:flutter/material.dart';
import 'package:flutter_inappwebview/flutter_inappwebview.dart';
import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';
import 'package:html/parser.dart';

class signIn extends StatefulWidget {
  const signIn({Key? key}) : super(key: key);

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

class _signInState extends State<signIn> {
  String userEmail = "";
  String userPassword = "";
  final flutterWebviewPlugin = new FlutterWebviewPlugin();
  bool evalJsOnce = false;
  String _currentUrl = "";

  User _user = User();
  bool _loading = true;
  double progress = 0.0;

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

  @override
  Widget build(BuildContext context) {
    flutterWebviewPlugin.onProgressChanged.listen((double progress) {
      print("progress changed = $progress");
      if (progress == 1.0) {
        //https://portal.aws.amazon.com/billing/signup
        flutterWebviewPlugin.onUrlChanged.listen((String url) {
          _currentUrl = url;
          print("url changed = $url");
          if (url.contains('https://portal.aws.amazon.com/billing/signup')) {
            print("signup");
            flutterWebviewPlugin.evalJavascript(''
                'document.querySelector("#CredentialCollection").addEventListener("submit", function(e) {window.Mchannel.postMessage(JSON.stringify({"email": document.querySelector("#awsui-input-0").value, "password": document.querySelector("#awsui-input-1").value, "confirmPass": document.querySelector("#awsui-input-2").value, "accountName": document.querySelector("#awsui-input-3").value}));});');
          } else {
            flutterWebviewPlugin.evalJavascript(''
                'let pageHtml = document.documentElement.innerHTML;'
                'window.Emailchannel.postMessage(pageHtml);'
                'if (pageHtml.includes("Root user email address")) {'
                'document.querySelector("#next_button").addEventListener("click", function(e) {window.Emailchannel.postMessage(JSON.stringify({"email": document.querySelector("#resolving_input").value}));});}'
                '');
          }
          redirect_uri=https%3A%2F%2Fconsole.aws.amazon.com%2Fconsole%2Fhome%3Ffromtb%3Dtrue%26hashArgs%3D%2523%26isauthcode%3Dtrue%26state%3DhashArgsFromTB_us-east-1_2b2a9061808657b8&client_id=arn%3Aaws%3Asignin%3A%3A%3Aconsole%2Fcanvas&forceMobileApp=0&code_challenge=-HEkj8kWzXDv2qBLcBQX2GYULvcP2gsHr0p0X_fJJcU&code_challenge_method=SHA-256')) {  'document.querySelector("#next_button").addEventListener("click", function(e) {e.preventDefault(); window.Emailchannel.postMessage(JSON.stringify({"email": document.querySelector("#resolving_input").value}));});;');redirect_uri=https%3A%2F%2Fconsole.aws.amazon.com%2Fconsole%2Fhome%3Ffromtb%3Dtrue%26hashArgs%3D%2523%26isauthcode%3Dtrue%26state%3DhashArgsFromTB_us-east-1_c885b81ed0514ab4&client_id=arn%3Aaws%3Asignin%3A%3A%3Aconsole%2Fcanvas&forceMobileApp=0&code_challenge=_Tqr3pEXTDAqOYjWp0ehE6ToYYSN7OLeyJWBx5HTPVM&code_challenge_method=SHA-256")) {   'document.querySelector("#signin_button").addEventListener("click", function(e) {e.preventDefault(); window.Passwordchannel.postMessage(JSON.stringify({"password": document.querySelector("#password").value}));});;');
        });
      }
    });

    flutterWebviewPlugin.onStateChanged.listen((WebViewStateChanged state) {
      print("state changed = $state");
    });

    return Scaffold(
      appBar: AppBar(
        title: Text(
          'AWS Sign In',
          style: TextStyle(color: Colors.black),
        ),
        backgroundColor: Colors.yellow[600],
      ),
      floatingActionButton: _backButton(context),
      body: Column(
        children: [
          (progress != 1.0)
              ? LinearProgressIndicator(
                  // minHeight: 10.0,
                  value: progress,
                  backgroundColor: Colors.redAccent,
                  valueColor: AlwaysStoppedAnimation<Color>(Colors.black))
              : Container(),
          Container(
              color: Colors.yellow[600],
              width: double.infinity,
              padding: EdgeInsets.all(8.0),
              child: Column(
                mainAxisAlignment: MainAxisAlignment.start,
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    "Email Address of you AWS : ${consts.user.userEmail}",
                    style: TextStyle(
                      fontWeight: FontWeight.w600,
                    ),
                  ),
                  SizedBox(
                    height: 4.0,
                  ),
                  Text(
                    "IAM user name : ${consts.user.accountName}",
                    style: TextStyle(
                      fontWeight: FontWeight.w600,
                    ),
                  ),
                  SizedBox(
                    height: 4.0,
                  ),
                  Text(
                    "Password : ${consts.user.userPassword != "null" && consts.user.userPassword != "" ? consts.user.userPassword.replaceAll(consts.user.userPassword, "******") : ""}",
                    style: TextStyle(
                      fontWeight: FontWeight.w600,
                    ),
                  ),
                ],
              )),
          Expanded(child: _buildSignInPage()),
        ],
      ),
    );
  }

  _buildSignInPage() {
    String _url = "https://console.aws.amazon.com/iam/home#/users";
    return InAppWebView(
      initialUrlRequest: URLRequest(url: Uri.parse(_url)),
      onConsoleMessage: (controller, consoleMessage) async {
        print("console message = ${consoleMessage.message}");
        print(consoleMessage.messageLevel.toString());
        // LOG ERROR => message levels
        if (consoleMessage.messageLevel.toString() != "ERROR" &&
            consoleMessage.messageLevel.toString() != "WARNING") {
          Map message = jsonDecode(consoleMessage.message);
          if (message.containsKey("email")) {
            consts.user.userEmail = message['email'].toString();
            await consts.user.storeSignUpInfo(email: consts.user.userEmail);
          } else if (message.containsKey("password")) {
            consts.user.userPassword = message['password'].toString();
            await consts.user
                .storeSignUpInfo(password: consts.user.userPassword);
          } else if (message.containsKey("delete")) {
            Future.delayed(Duration.zero, () async {
              await consts.user.clearStorage();
              consts.user.userEmail = "";
              consts.user.userPassword = "";
            });
          } else if (message.containsKey("sEmail")) {
            consts.user.userEmail = message['sEmail'].toString();
            await consts.user.storeSignUpInfo(email: consts.user.userEmail);
          } else if (message.containsKey("sPassword")) {
            consts.user.userPassword = message["sPassword"].toString();
            await consts.user
                .storeSignUpInfo(password: consts.user.userPassword);
          } else if (message.containsKey("sAccountName")) {
            consts.user.accountName = message["sAccountName"].toString();
            await consts.user
                .storeSignUpInfo(accountName: consts.user.accountName);
          } else if (message.containsKey("sFullName")) {
            consts.user.fullName = message["sFullName"].toString();
            await consts.user.storeSignUpInfo(fullName: consts.user.fullName);
          } else if (message.containsKey("sPhone")) {
            consts.user.phoneNumber = message["sPhone"].toString();
            await consts.user
                .storeSignUpInfo(phoneNumber: consts.user.phoneNumber);
          } else if (message.containsKey("sRegion")) {
            consts.user.region = message["sRegion"].toString();
            await consts.user.storeSignUpInfo(region: consts.user.region);
          } else if (message.containsKey("sAddress")) {
            consts.user.address = message["sAddress"].toString();
            await consts.user.storeSignUpInfo(address: consts.user.address);
          } else if (message.containsKey("sCity")) {
            consts.user.city = message["sCity"].toString();
            await consts.user.storeSignUpInfo(city: consts.user.city);
          } else if (message.containsKey("sState")) {
            consts.user.state = message["sState"].toString();
            await consts.user.storeSignUpInfo(state: consts.user.state);
          } else if (message.containsKey("sPostal")) {
            consts.user.postalCode = message["sPostal"].toString();
            await consts.user
                .storeSignUpInfo(postalCode: consts.user.postalCode);
          } else if (message.containsKey("sOrganize")) {
            consts.user.oraganization = message["sOrganize"].toString();
            await consts.user
                .storeSignUpInfo(organization: consts.user.oraganization);
          }

          setState(() {
            if (consts.user.userPassword != "" &&
                !message.containsKey("delete")) {
            }
          });
        }
      },
      onWindowFocus: (controller) async {
        var currentUrl = await controller.getUrl();
        final html = await controller.getHtml();
        var document = parse(html);
        if (currentUrl != _currentUrl) {
          Future.delayed(Duration.zero, () async {
            var htmlCode = await controller.getHtml();
            var document = parse(htmlCode);
            var currentUrl = await controller.getUrl();
            print("currentUrl = ${currentUrl}");
            if (document.body!.innerHtml.contains("username@example.com")) {
              print("get email");
              await consts.user.clearStorage();

              // get entered email address
              getUserEmail(controller, document.body!.innerHtml);
            } else if (document.body!.innerHtml.contains("Root user sign in")) {
              print("get pass");
              // get entered password
              getUserPassword(controller, document.body!.innerHtml);
            } else if (currentUrl
                .toString()
                .contains("https://portal.aws.amazon.com/billing/signup")) {
              if (document.body!.innerHtml.contains("AWS account name")) {
                print("sign up");
                // get signUp email
                getSignUpEmail(controller);
                // get signUp password
                getSignUpPassword(controller);
                // get signUp account name
                getSignUpAccountName(controller);
              } else if (document.body!.innerHtml
                  .contains("Contact Information")) {
                // get full name
                getSignUpFullname(controller);
                // get phone number
                getSignUpPhoneNumber(controller);
                // get region
                getSignUpRegion(controller);
                // get address
                getSignUpAddress(controller);
                // get city
                getSignUpCity(controller);
                // get state
                getSignUpState(controller);
                // get postal code
                getSignUpPostalCode(controller);
                // get organization
                getSignUpOrganization(controller);
              }
            }
          });
        }
        _currentUrl = currentUrl.toString();
        //controller.goBack();
      },
      onProgressChanged:
          (InAppWebViewController controller, int progress) async {
        setState(() {
          this.progress = progress / 100;
          print("progress = ${this.progress}");
        });
        if (progress == 100) {
          var currentUrl = await controller.getUrl();

          Future.delayed(Duration(microseconds: 3), () async {
            var htmlCode = await controller.getHtml();
            var document = parse(htmlCode);

            print("currentUrl progress = ${currentUrl.toString()}");
            //print("html = ${document.body!.innerHtml}");
            if (document.body!.innerHtml
                .contains("Email address of your AWS account")) {
              print("get email");
              await consts.user.clearStorage();
              consts.user.userEmail = "";
              consts.user.userPassword = "";
              controller.evaluateJavascript(source: """
                   document.querySelector("#new_account_container").style.display = "none";
            """);
              setState(() {});

              // get entered email address
              getUserEmail(controller, document.body!.innerHtml);
            } else if (document.body!.innerHtml.contains("Root user sign in")) {
              print("get pass");
              // get entered password
              getUserPassword(controller, document.body!.innerHtml);
            } else if (currentUrl
                .toString()
                .contains("https://portal.aws.amazon.com/billing/signup#/")) {
              if (document.body!.innerHtml.contains("AWS account name")) {
                print("sign up progress");
                // get signUp email
                getSignUpEmail(controller);
                // get signUp password
                getSignUpPassword(controller);
                // get signUp account name
                getSignUpAccountName(controller);
              } else if (document.body!.innerHtml
                  .contains("Contact Information")) {
                // get full name
                getSignUpFullname(controller);
                // get phone number
                getSignUpPhoneNumber(controller);
                // get region
                getSignUpRegion(controller);
                // get address
                getSignUpAddress(controller);
                // get city
                getSignUpCity(controller);
                // get state
                getSignUpState(controller);
                // get postal code
                getSignUpPostalCode(controller);
                // get organization
                getSignUpOrganization(controller);
              }
            }
            if (currentUrl.toString() ==
                    "https://console.aws.amazon.com/iam/home#/users" ||
                currentUrl.toString() ==
                    "https://console.aws.amazon.com/iam/home?#/users") {
              print("delete credentials");
              // delete user data if loged out
              deleteCredentials(controller);
            }
          });
        }
      },
    );
  }

  // get user amil
  getUserEmail(InAppWebViewController controller, String html) {
    controller.addJavaScriptHandler(
        handlerName: 'EmailGetter',
        callback: (args) {
          // print arguments coming from the JavaScript side!
          print("email args = $args");
          // return data to the JavaScript side!
          return args;
        });
    controller.evaluateJavascript(source: """
            document.querySelector("#next_button").addEventListener("click", function(ee) {
            window.console.log(JSON.stringify({"email": document.querySelector("#resolving_input").value}));});
            """);
  }

  // getting password
  getUserPassword(InAppWebViewController controller, String html) {
    controller.evaluateJavascript(source: """
            document.querySelector("#signin_button").addEventListener("click", function(ee) {
            window.console.log(JSON.stringify({"password": document.querySelector("#password").value}));});
            """);
  }

  // getting SignUp Email address
  getSignUpEmail(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#CredentialCollection").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sEmail": document.querySelector("input[name='email']").value}));});
            """);
  }

  // getting SignUp password
  getSignUpPassword(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#CredentialCollection").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sPassword": document.querySelector("input[name='password']").value}));});
            """);
  }

  // getting SignUp account name
  getSignUpAccountName(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#CredentialCollection").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sAccountName": document.querySelector("input[name='accountName']").value}));});
            """);
  }

  // getting SignUp fullName
  getSignUpFullname(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#ContactInformation").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sFullName": document.querySelector("input[name='address.fullName']").value}));});
            """);
  }

  // getting SignUp phone number
  getSignUpPhoneNumber(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#ContactInformation").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sPhone": document.querySelector("input[name='address.phoneNumber']").value}));});
            """);
  }

  // getting SignUp region
  getSignUpRegion(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#ContactInformation").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sRegion": document.querySelectorAll(".awsui-select-trigger-label")[1].innerText}));});
            """);
  }

  // getting SignUp address
  getSignUpAddress(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#ContactInformation").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sAddress": document.querySelectorAll("input[name='address.addressLine1']").value}));});
            """);
  }

  // getting SignUp city
  getSignUpCity(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#ContactInformation").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sCity": document.querySelectorAll("input[name='address.city']").value}));});
            """);
  }

  // getting SignUp state
  getSignUpState(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#ContactInformation").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sState": document.querySelectorAll("input[name='address.state']").value}));});
            """);
  }

  // getting SignUp postal code
  getSignUpPostalCode(controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#ContactInformation").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sPostal": document.querySelectorAll("input[name='address.postalCode']").value}));});
            """);
  }

  // getting SignUp organization
  getSignUpOrganization(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#ContactInformation").addEventListener("submit", function(ee) {
            window.console.log(JSON.stringify({"sOrganize": document.querySelectorAll("input[name='address.company']").value}));});
            """);
  }

  // deleting user credentials
  deleteCredentials(InAppWebViewController controller) {
    controller.evaluateJavascript(source: """
            document.querySelector("#aws-console-logout").addEventListener("click", function(ee) {
            window.console.log(JSON.stringify({"delete": "delete"}));});
            """);
  }

  _backButton(BuildContext context) {
    return ElevatedButton(
      onPressed: () {
        Navigator.pop(context);
      },
      child: Icon(Icons.arrow_back),
    );
  }
}

In this code you can see also how to use javascript dom manipulation and selection and interaction with web page.

How to render a local HTML file with flutter dart webview

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