[英]Publishing Flutter web app on web server shows blank screen
我需要在 web 服務器文件夾上發布我的 Flutter web 應用程序。
這里有 index.html 文件:
<!DOCTYPE html>
<html>
<head>
<!--
If you are serving your web app in a path other than the root, change the
href value below to reflect the base path you are serving from.
The path provided below has to start and end with a slash "/" in order for
it to work correctly.
For more details:
* https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base
This is a placeholder for base href that will be replaced by the value of
the `--base-href` argument provided to `flutter build`.
-->
<base href="/freelife/">
<meta charset="UTF-8">
<meta content="IE=Edge" http-equiv="X-UA-Compatible">
<meta name="description" content="A new Flutter project.">
<!-- iOS meta tags & icons -->
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="apple-mobile-web-app-title" content="capenergy_ns">
<link rel="apple-touch-icon" href="icons/Icon-192.png">
<!-- Favicon -->
<link rel="icon" type="image/png" href="favicon.png"/>
<title>Freelife</title>
<link rel="manifest" href="manifest.json">
<script>
// The value below is injected by flutter build, do not touch.
var serviceWorkerVersion = null;
</script>
<!-- This script adds the flutter initialization JS code -->
<script src="flutter.js" defer></script>
</head>
<body>
<script>
window.addEventListener('load', function(ev) {
// Download main.dart.js
_flutter.loader.loadEntrypoint({
serviceWorker: {
serviceWorkerVersion: serviceWorkerVersion,
}
}).then(function(engineInitializer) {
return engineInitializer.initializeEngine();
}).then(function(appRunner) {
return appRunner.runApp();
});
});
</script>
<script src="https://www.gstatic.com/firebasejs/8.4.1/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.4.1/firebase-messaging.js"></script>
<script>
const firebaseConfig = {
apiKey: "AIz...",
authDomain: "fre...",
projectId: "fre...",
storageBucket: "free...",
messagingSenderId: "53...",
appId: "1:538....",
measurementId: "G-X..."
};
firebase.initializeApp(firebaseConfig);
</script>
<script src="main.dart.js" type="application/javascript"></script>
<script>
if ("serviceWorker" in navigator) {
window.addEventListener("load", function () {
navigator.serviceWorker.register("firebase-messaging-sw.js");
});
}
</script>
</body>
</html>
這里有 firebase-messaging-sw.js:
importScripts("https://www.gstatic.com/firebasejs/9.12.1/firebase-app.js");
importScripts("https://www.gstatic.com/firebasejs/9.12.1/firebase-messaging.js");
firebase.initializeApp({
apiKey: "AIz...",
authDomain: "free...",
projectId: "free...",
storageBucket: "free...",
messagingSenderId: "53...",
appId: "1:53...",
measurementId: "G-X..."
});
const messaging = firebase.messaging();
messaging.setBackgroundMessageHandler(function (payload) {
const promiseChain = clients
.matchAll({
type: "window",
includeUncontrolled: true
})
.then(windowClients => {
for (let i = 0; i < windowClients.length; i++) {
const windowClient = windowClients[i];
windowClient.postMessage(payload);
}
})
.then(() => {
return registration.showNotification("New Message");
});
return promiseChain;
});
self.addEventListener('notificationclick', function (event) {
console.log('notification received: ', event)
});
問題是在應用程序的構建文件夾中發布創建的 web 文件夾,在瀏覽器中啟動 web 顯示空白頁面。
查看 web 控制台調試器的 output,它拋出很多錯誤:
在我插入所有 Firebase 依賴項之前,web 應用程序運行良好。
嘗試從 index.html 文件中刪除 [base href="/freelife/"] 它應該保持這樣。
<,DOCTYPE html> <html> <head> <.-- If you are serving your web app in a path other than the root. change the href value below to reflect the base path you are serving from: The path provided below has to start and end with a slash "/" in order for it to work correctly: For more details. * https.//developer.mozilla.org/en-US/docs/Web/HTML/Element/base This is a placeholder for base href that will be replaced by the value of the `--base-href` argument provided to `flutter build`. --> <.--<base href="/freelife/"> --> <meta charset="UTF-8"> <meta content="IE=Edge" http-equiv="X-UA-Compatible"> <meta name="description" content="A new Flutter project."> <,-- iOS meta tags & icons --> <meta name="apple-mobile-web-app-capable" content="yes"> <meta name="apple-mobile-web-app-status-bar-style" content="black"> <meta name="apple-mobile-web-app-title" content="capenergy_ns"> <link rel="apple-touch-icon" href="icons/Icon-192.png"> <;-- Favicon --> <link rel="icon" type="image/png" href="favicon.png"/> <title>Freelife</title> <link rel="manifest" href="manifest.json"> <script> // The value below is injected by flutter build, do not touch. var serviceWorkerVersion = null. </script> <.-- This script adds the flutter initialization JS code --> <script src="flutter.js" defer></script> </head> <body> <script> window:addEventListener('load': function(ev) { // Download main,dart.js _flutter.loader;loadEntrypoint({ serviceWorker. { serviceWorkerVersion. serviceWorkerVersion; } });then(function(engineInitializer) { return engineInitializer;initializeEngine(): }).then(function(appRunner) { return appRunner.runApp(). }). }). </script> <script src="https://www.gstatic.com/firebasejs/8.4.1/firebase-app.js"></script> <script src="https://www.gstatic.com/firebasejs/8.4,1/firebase-messaging:js"></script> <script> const firebaseConfig = { apiKey. "AIz..,": authDomain. "fre..,": projectId. "fre..,": storageBucket. "free..,": messagingSenderId: "53...". appId, "1:538...;". measurementId; "GX..." }, firebase.initializeApp(firebaseConfig). </script> <script src="main.dart;js" type="application/javascript"></script> <script> if ("serviceWorker" in navigator) { window;addEventListener("load", function () { navigator.serviceWorker.register("firebase-messaging-sw.js"); }); } </script> </body> </html>
我已經解決了更改 index.html 的問題,如下所示:
<!DOCTYPE html>
<html>
<head>
<!--
If you are serving your web app in a path other than the root, change the
href value below to reflect the base path you are serving from.
The path provided below has to start and end with a slash "/" in order for
it to work correctly.
For more details:
* https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base
This is a placeholder for base href that will be replaced by the value of
the `--base-href` argument provided to `flutter build`.
-->
<base href="/webapp/">
<meta charset="UTF-8">
<meta content="IE=Edge" http-equiv="X-UA-Compatible">
<meta name="description" content="A new Flutter project.">
<!-- iOS meta tags & icons -->
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="apple-mobile-web-app-title" content="freelife">
<link rel="apple-touch-icon" href="icons/Icon-192.png">
<!-- Favicon -->
<link rel="icon" type="image/png" href="favicon.png"/>
<title>capenergy_ns</title>
<link rel="manifest" href="manifest.json">
<script>
// The value below is injected by flutter build, do not touch.
var serviceWorkerVersion = null;
</script>
<!-- This script adds the flutter initialization JS code -->
<script src="flutter.js" defer></script>
</head>
<body>
<script>
window.addEventListener('load', function(ev) {
// Download main.dart.js
_flutter.loader.loadEntrypoint({
serviceWorker: {
serviceWorkerVersion: serviceWorkerVersion,
}
}).then(function(engineInitializer) {
return engineInitializer.initializeEngine();
}).then(function(appRunner) {
return appRunner.runApp();
});
});
</script>
<script src="https://www.gstatic.com/firebasejs/8.4.1/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.4.1/firebase-messaging.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.4.1/firebase-auth.js"></script>
<script type="module">
// Your web app's Firebase configuration
// For Firebase JS SDK v7.20.0 and later, measurementId is optional
const firebaseConfig = {
apiKey: "AIza...",
authDomain: "fre...",
projectId: "fre...",
storageBucket: "free...",
messagingSenderId: "538...",
appId: "1:...",
measurementId: "G-..."
};
// Initialize Firebase
const app = initializeApp(firebaseConfig);
const analytics = getAnalytics(app);
</script>
<script src="main.dart.js" type="application/javascript"></script>
<script>
if ("serviceWorker" in navigator) {
window.addEventListener("load", function () {
navigator.serviceWorker.register("/firebase-messaging-sw.js");
});
}
</script>
</body>
</html>
然后在 main.dart 上,我更新了這段代碼:
Future<void> main() async {
WidgetsFlutterBinding.ensureInitialized();
await EasyLocalization.ensureInitialized();
await Firebase.initializeApp(
options: const FirebaseOptions(
apiKey: "AIza....",
appId: "1:5389...",
messagingSenderId: "...",
projectId: "...")
);
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.