pichillilorenzo/JavaScriptHandlersExample.dart

## JavaScriptHandlersExample.dart
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter_inappwebview/flutter_inappwebview.dart';

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

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

class _MyAppState extends State<MyApp> {
  InAppWebViewController _webViewController;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('InAppWebView Example'),
        ),
        body: Container(
            child: Column(children: <Widget>[
              Expanded(
                child:InAppWebView(
                    initialData: InAppWebViewInitialData(
                      data: """
<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    </head>
    <body>
        <h1>JavaScript Handlers (Channels) TEST</h1>
        <script>
            window.addEventListener("flutterInAppWebViewPlatformReady", function(event) {
                window.flutter_inappwebview.callHandler('handlerFoo')
                  .then(function(result) {
                    // print to the console the data coming
                    // from the Flutter side.
                    console.log(JSON.stringify(result));

                    window.flutter_inappwebview
                      .callHandler('handlerFooWithArgs', 1, true, ['bar', 5], {foo: 'baz'}, result);
                });
            });
        </script>
    </body>
</html>
                      """
                    ),
                    initialOptions: InAppWebViewGroupOptions(
                        crossPlatform: InAppWebViewOptions(
                          debuggingEnabled: true,
                        )
                    ),
                    onWebViewCreated: (InAppWebViewController controller) {
                      _webViewController = controller;

                      _webViewController.addJavaScriptHandler(handlerName:'handlerFoo', callback: (args) {
                        // return data to JavaScript side!
                        return {
                          'bar': 'bar_value', 'baz': 'baz_value'
                        };
                      });

                      _webViewController.addJavaScriptHandler(handlerName: 'handlerFooWithArgs', callback: (args) {
                        print(args);
                        // it will print: [1, true, [bar, 5], {foo: baz}, {bar: bar_value, baz: baz_value}]
                      });
                    },
                    onConsoleMessage: (controller, consoleMessage) {
                      print(consoleMessage);
                      // it will print: {message: {"bar":"bar_value","baz":"baz_value"}, messageLevel: 1}
                    },
                ),
              ),
            ])),
      ),
    );
  }
}
	import 'dart:async';
	import 'package:flutter/material.dart';
	import 'package:flutter_inappwebview/flutter_inappwebview.dart';

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

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

	class _MyAppState extends State<MyApp> {
	InAppWebViewController _webViewController;

	@override
	Widget build(BuildContext context) {
	return MaterialApp(
	home: Scaffold(
	appBar: AppBar(
	title: const Text('InAppWebView Example'),
	),
	body: Container(
	child: Column(children: <Widget>[
	Expanded(
	child:InAppWebView(
	initialData: InAppWebViewInitialData(
	data: """
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
	</head>
	<body>
	<h1>JavaScript Handlers (Channels) TEST</h1>
	<script>
	window.addEventListener("flutterInAppWebViewPlatformReady", function(event) {
	window.flutter_inappwebview.callHandler('handlerFoo')
	.then(function(result) {
	// print to the console the data coming
	// from the Flutter side.
	console.log(JSON.stringify(result));

	window.flutter_inappwebview
	.callHandler('handlerFooWithArgs', 1, true, ['bar', 5], {foo: 'baz'}, result);
	});
	});
	</script>
	</body>
	</html>
	"""
	),
	initialOptions: InAppWebViewGroupOptions(
	crossPlatform: InAppWebViewOptions(
	debuggingEnabled: true,
	)
	),
	onWebViewCreated: (InAppWebViewController controller) {
	_webViewController = controller;

	_webViewController.addJavaScriptHandler(handlerName:'handlerFoo', callback: (args) {
	// return data to JavaScript side!
	return {
	'bar': 'bar_value', 'baz': 'baz_value'
	};
	});

	_webViewController.addJavaScriptHandler(handlerName: 'handlerFooWithArgs', callback: (args) {
	print(args);
	// it will print: [1, true, [bar, 5], {foo: baz}, {bar: bar_value, baz: baz_value}]
	});
	},
	onConsoleMessage: (controller, consoleMessage) {
	print(consoleMessage);
	// it will print: {message: {"bar":"bar_value","baz":"baz_value"}, messageLevel: 1}
	},
	),
	),
	])),
	),
	);
	}
	}