pichillilorenzo/FlutterInAppWebView5JavaScriptHandlersExample.dart

## FlutterInAppWebView5JavaScriptHandlersExample.dart
import 'dart:async';
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flutter_inappwebview/flutter_inappwebview.dart';

Future main() async {
  WidgetsFlutterBinding.ensureInitialized();

  if (Platform.isAndroid) {
    await AndroidInAppWebViewController.setWebContentsDebuggingEnabled(true);
  }

  runApp(new MyApp());
}

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

class _MyAppState extends State<MyApp> {

  InAppWebViewGroupOptions options = InAppWebViewGroupOptions(
      android: AndroidInAppWebViewOptions(
        useHybridComposition: true,
      ),);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
          appBar: AppBar(title: Text("JavaScript Handlers")),
          body: SafeArea(
              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</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: options,
                    onWebViewCreated: (controller) {
                      controller.addJavaScriptHandler(handlerName: 'handlerFoo', callback: (args) {
                        // return data to the JavaScript side!
                        return {
                          'bar': 'bar_value', 'baz': 'baz_value'
                        };
                      });

                      controller.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 'dart:io';
	import 'package:flutter/material.dart';
	import 'package:flutter_inappwebview/flutter_inappwebview.dart';

	Future main() async {
	WidgetsFlutterBinding.ensureInitialized();

	if (Platform.isAndroid) {
	await AndroidInAppWebViewController.setWebContentsDebuggingEnabled(true);
	}

	runApp(new MyApp());
	}

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

	class _MyAppState extends State<MyApp> {

	InAppWebViewGroupOptions options = InAppWebViewGroupOptions(
	android: AndroidInAppWebViewOptions(
	useHybridComposition: true,
	),);

	@override
	Widget build(BuildContext context) {
	return MaterialApp(
	home: Scaffold(
	appBar: AppBar(title: Text("JavaScript Handlers")),
	body: SafeArea(
	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</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: options,
	onWebViewCreated: (controller) {
	controller.addJavaScriptHandler(handlerName: 'handlerFoo', callback: (args) {
	// return data to the JavaScript side!
	return {
	'bar': 'bar_value', 'baz': 'baz_value'
	};
	});

	controller.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}
	},
	),
	),
	]))),
	);
	}
	}