Uncaught (in promise) DOMException: Subscription failed - no active Service Worker
Posted
技术标签:
【中文标题】Uncaught (in promise) DOMException: Subscription failed - no active Service Worker【英文标题】: 【发布时间】:2016-09-21 19:08:49 【问题描述】:我正在尝试订阅用户,但这是我第一次遇到的错误。 第二次,它正在工作,因为用户已经处于活动状态
这是我的代码:
if ('serviceWorker' in navigator)
console.log('Service Worker is supported');
navigator.serviceWorker.register('sw.js').then(function(reg)
console.log(':^)', reg);
reg.pushManager.subscribe(
userVisibleOnly: true
).then(function(sub)
console.log('endpoint:', sub.endpoint);
var div = document.getElementById('id');
div.innerhtml = div.innerHTML + sub.endpoint;
// var b = document.getElementsByTagName('body')[0];
//b.appendChild(div);
//alert(sub.endpoint);
);
);
我已经尝试了以下方法,但 ready.then()
方法没有发生:
if ('serviceWorker' in navigator)
console.log('Service Worker is supported');
navigator.serviceWorker.register('sw.js').then(function(sreg)
console.log(':^)', sreg);
navigator.serviceWorker.ready.then(function(reg)
reg.pushManager.subscribe(
userVisibleOnly: true
).then(function(sub)
console.log('endpoint:', sub.endpoint);
var div = document.getElementById('id');
div.innerHTML = div.innerHTML + sub.endpoint;
// var b = document.getElementsByTagName('body')[0];
//b.appendChild(div);
//alert(sub.endpoint);
);
);
);
有什么想法吗?
【问题讨论】:
【参考方案1】:在触发订阅之前,您应该等待服务工作者被激活。
使用 stateChange 监听器来确定 service worker 是否处于活动状态
navigator.serviceWorker.register(workerFileName, scope: "/")
.then(
function (reg)
var serviceWorker;
if (reg.installing)
serviceWorker = reg.installing;
// console.log('Service worker installing');
else if (reg.waiting)
serviceWorker = reg.waiting;
// console.log('Service worker installed & waiting');
else if (reg.active)
serviceWorker = reg.active;
// console.log('Service worker active');
if (serviceWorker)
console.log("sw current state", serviceWorker.state);
if (serviceWorker.state == "activated")
//If push subscription wasnt done yet have to do here
console.log("sw already activated - Do watever needed here");
serviceWorker.addEventListener("statechange", function(e)
console.log("sw statechange : ", e.target.state);
if (e.target.state == "activated")
// use pushManger for subscribing here.
console.log("Just now activated. now we can subscribe for push notification")
subscribeForPushNotification(reg);
);
,
function (err)
console.error('unsuccessful registration with ', workerFileName, err);
);
【讨论】:
【参考方案2】:您可以通过检查 Service Worker 状态来解决此问题。仅在服务人员处于活动状态时执行您的操作。
navigator.serviceWorker.register('sw.js').then(function(reg)
if(reg.installing)
console.log('Service worker installing');
else if(reg.waiting)
console.log('Service worker installed');
else if(reg.active)
console.log('Service worker active');
// Include below mentioned validations
检查是否支持推送通知
// Check if push messaging is supported
if (!('PushManager' in window))
console.log('Push messaging isn\'t supported.');
return;
//
if (Notification.permission === 'denied')
console.log('The user has blocked notifications.');
return;
在这两个检查实现您的功能之后。
navigator.serviceWorker.ready.then(function(reg) .... )
希望对你有帮助
【讨论】:
但它仍然没有注册用户,这是我的问题 是这个console.log(':^)', reg);打印出来? 你能检查一下没有推送管理器的代码是否工作正常吗? 只需注释掉 reg.pushManager.subscribe( 代码并检查它是否工作正常? 尝试为 serviceWorker.register 方法设置范围。检查我的代码@github.com/bandhavya/bandhavya.github.io 我没有包含 pushManager。以上是关于Uncaught (in promise) DOMException: Subscription failed - no active Service Worker的主要内容,如果未能解决你的问题,请参考以下文章
解决Uncaught (in promise) reason的问题
Uncaught (in Promise) DOMException: play() 只能由用户手势启动
解决Uncaught (in promise) reason的问题
Uncaught (in promise):消息端口在收到响应之前关闭
vue控制台报 Uncaught (in promise) TypeError:
Uncaught (in promise) TypeError: Cannot set properties of null (setting 'innerText') in OpenWetherMa