我有一个颤振代码片段，它从我的 iframe 页面侦听 postMessage。(flutter_webview_plugin: ^0.3.9+1)
flutterWebviewPlugin.onStateChanged.listen((viewState) async {
String script = 'window.addEventListener("message", receiveMessage, false);' +
'function receiveMessage(event) {console.log(\'receiving data from child , data as follows: \',event.data)}';
flutterWebviewPlugin.evalJavascript(script);
}
如果event.data返回特定值，我想触发特定的颤振函数， 相机值将触发我调用相机插件等的特定函数。意思是说我的目标 iFrame 将尝试通过postMessage方法进行跨域通信。
对于科尔多瓦，我可以这样做：
window.addEventListener( "message" , function( event )
{
else if( event.data.indexOf( "camera" ) >= 0 )
{
//Trigger Camera Function
我该如何为颤振做这件事？
Trầ*_*Tâm 10
2个解决方案：
解决方案1：推荐
import 'package:flutter/material.dart';
import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';
final Set<JavascriptChannel> jsChannels = [
JavascriptChannel(
name: 'Print',
onMessageReceived: (JavascriptMessage message) {
print('message.message: ${message.message}');
}),
].toSet();
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
routes: {
"/": (_) => WebviewScaffold(
url: Uri.dataFromString(
'<html><button onclick="Print.postMessage(\'test\');">Click me</button></html>',
mimeType: 'text/html')
.toString(),
appBar: new AppBar(title: new Text("Widget webview")),
javascriptChannels: jsChannels,
),
},
);
}
}
I/flutter (22119): message.message: test
解决方案 2：如果您想保留您的window.post. （也许您想使用iframe其他平台的）
import 'package:flutter/material.dart';
import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';
final Set<JavascriptChannel> jsChannels = [
JavascriptChannel(
name: 'Print',
onMessageReceived: (JavascriptMessage message) {
print('message.message: ${message.message}');
}),
].toSet();
void main() {
final flutterWebviewPlugin = FlutterWebviewPlugin();
flutterWebviewPlugin.onStateChanged.listen((state) async {
if (state.type == WebViewState.finishLoad) {
String script =
'window.addEventListener("message", receiveMessage, false);' +
'function receiveMessage(event) {Print.postMessage(event.data);}';
flutterWebviewPlugin.evalJavascript(script);
}
});
return runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
routes: {
"/": (_) => WebviewScaffold(
url: Uri.dataFromString(
'<html><button onclick="window.postMessage(\'test\', \'*\');">Click me</button></html>',
mimeType: 'text/html')
.toString(),
appBar: new AppBar(title: new Text("Widget webview")),
javascriptChannels: jsChannels,
),
},
);
}
}
I/flutter (22119): message.message: test
pubspec.yaml：
dependencies:
flutter:
sdk: flutter
cupertino_icons: ^0.1.2
flutter_webview_plugin: 0.3.9+1
参考：
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