Description:

webview jsbridge

webview_jsbridge #
中文文档
A flutter jsbridge package compatible with webview_flutter, no native dependence.
Full compatible with Android JsBridge and iOS WebViewJavascriptBridge.
Usage #
WebView _buildWebView() {
return WebView(
javascriptChannels: jsBridge.jsChannels,
// must enable js
javascriptMode: JavascriptMode.unrestricted,
onWebViewCreated: (controller) {
jsBridge.controller = controller;
jsBridge.defaultHandler = _defaultHandler;
jsBridge.registerHandler("NativeEcho", _nativeEchoHandler);
},
navigationDelegate: (NavigationRequest navigation) {
// this is no effect on Android
if (navigation.url.contains('__bridge_loaded__')) {
jsBridge.injectJs();
return NavigationDecision.prevent;
}
return NavigationDecision.navigate;
},
onPageFinished: (String url) {
jsBridge.injectJs();
},
initialUrl: 'https://example.com',
);
}

Future<void> _send() async {
final res = await jsBridge.send('send from native');
print('_send res: $res');
}

Future<void> _callJs() async {
final res =
await jsBridge.callHandler('JSEcho', data: 'callJs from native');
print('callJs res: $res');
}

Future<Object?> _defaultHandler(Object? data) async {
await Future.delayed(Duration(seconds: 1), () {});
return '_defaultHandler from native';
}

Future<Object?> _nativeEchoHandler(Object? data) async {
await Future.delayed(Duration(seconds: 1), () {});
return '_nativeEchoHandler from native';
}
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default js implementation #
Default js implementation is es5 version. Using this version, web client has no need to change anything.
async js implementation #
If web client is using es7, here is a async implementation. You just need choose es7 version to inject. Like this:
dart client
jsBridge.injectJs(esVersion: WebViewInjectJsVersion.es7);
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js client
setupWebViewJavascriptBridge(function (bridge) {
console.log('setupWebViewJavascriptBridge done');
async function defaultHandler(message) {
console.log('defaultHandler JS got a message', message);
return new Promise(resolve => {
let data = {
'Javascript Responds': 'defaultHandler Wee!'
};
console.log('defaultHandler JS responding with', data);
setTimeout(() => resolve(data), 0);
});
}

bridge.init(defaultHandler);

async function JSEcho(data) {
console.log("JS Echo called with:", data);
return new Promise(resolve => setTimeout(() => resolve(data), 0));
}

bridge.registerHandler('JSEcho', JSEcho);
});

async function sendHello() {
let responseData = await window.WebViewJavascriptBridge.send('hello');
console.log("repsonseData from java, data = ", responseData);
}

async function callHandler() {
let responseData = await window.WebViewJavascriptBridge.callHandler('NativeEcho', { 'key': 'value' });
console.log("JS received response:", responseData);
}
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License

For personal and professional use. You cannot resell or redistribute these repositories in their original state.

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