我正在Chrome版本42.0.2311.152m下进行测试,并且想要实现在notificationclick上打开一个窗口,如下例所示:(源:https://developer.mozilla.org/en-US/docs/Web/API/WindowClient


self.addEventListener('notificationclick', function(event) {
  console.log('On notification click: ', event.notification.tag);
  event.notification.close();

  // This looks to see if the current is already open and
  // focuses if it is
  event.waitUntil(clients.matchAll({
    type: "window"
  }).then(function(clientList) {
    for (var i = 0; i < clientList.length; i++) {
      var client = clientList[i];
      if (client.url == '/' && 'focus' in client)
        return client.focus();
    }
    if (clients.openWindow)
      return clients.openWindow('/');
  }));
});


我的文件结构是这样的:
https://myurl.no-ip.org/app/index.html
https://myurl.no-ip.org/app/manifest.json
https://myurl.no-ip.org/app/service-worker.js

我有一个问题,我总是得到


InvalidAccessError


在service-worker.js中调用clients.openWindow('/')或clients.openWindow('https://myurl.no-ip.org/app/index.html')时,收到错误消息:

{code: 15,
message: "Not allowed to open a window.",
name: "InvalidAccessError"}


永远不会到达“ return client.focus()”行,因为client.url绝不会只是“ /”。
看着

clients.matchAll({type: "window"})
.then(function (clientList) {
console.log(clientList[0])});


我看到当前的WindowClient:

{focused: false,
frameType: "top-level",
url: "https://myurl.no-ip.org/app/index.html",
visibilityState: "hidden" }


属性“ focused”和“ visibilityState”正确且正确更改。
通过手动聚焦

clients.matchAll({type: "window"})
    .then(function (clientList) {
    clientList[0].focus()});


我收到错误:

{code: 15,
message: "Not allowed to focus a window.",
name: "InvalidAccessError"}


我认为问题在于网址不只是'/'。您对此有什么想法吗?

非常感谢你!
最好的祝福
和我

最佳答案

您的代码对我来说很好用,所以我将解释使用openWindow / focus的要求以及如何避免出现“不允许[打开|聚焦]窗口”错误消息。

只有在单击通知后(至少在Chrome 47中),才允许使用clients.openWindow()windowClient.focus(),并且在单击处理程序期间,最多可以调用这些方法之一。此行为在https://github.com/slightlyoff/ServiceWorker/issues/602中指定。

如果您的openWindow / focus呼叫被拒绝并显示错误消息


“不允许打开窗户。”对于openWindow
“不允许聚焦窗口。”对于focus


则您不满足openWindow / focus的要求。例如(所有点也适用于focus,而不仅仅是openWindow)。


未单击通知时调用了openWindow
openWindow处理程序返回后,调用了notificationclick,并且您未通过承诺调用event.waitUntil
传递给openWindow的承诺解决后,调用event.waitUntil
该诺言尚未解决,但是花费了太长的时间(10 seconds in Chrome),因此调用openWindow的临时权限已过期。


确实有必要在openWindow处理程序完成之前最多调用一次focus / notificationclick

正如我之前所说,问题中的代码有效,因此我将展示另一个带注释的示例。

// serviceworker.js
self.addEventListener('notificationclick', function(event) {
    // Close notification.
    event.notification.close();

    // Example: Open window after 3 seconds.
    // (doing so is a terrible user experience by the way, because
    //  the user is left wondering what happens for 3 seconds.)
    var promise = new Promise(function(resolve) {
        setTimeout(resolve, 3000);
    }).then(function() {
        // return the promise returned by openWindow, just in case.
        // Opening any origin only works in Chrome 43+.
        return clients.openWindow('https://example.com');
    });

    // Now wait for the promise to keep the permission alive.
    event.waitUntil(promise);
});


index.html

<button id="show-notification-btn">Show notification</button>
<script>
navigator.serviceWorker.register('serviceworker.js');
document.getElementById('show-notification-btn').onclick = function() {
    Notification.requestPermission(function(result) {
        // result = 'allowed' / 'denied' / 'default'
        if (result !== 'denied') {
            navigator.serviceWorker.ready.then(function(registration) {
                // Show notification. If the user clicks on this
                // notification, then "notificationclick" is fired.
                registration.showNotification('Test');
            });
        }
    });
}
</script>


PS。服务人员仍在开发中,因此值得一提的是,我已验证上述说明在Chrome 49中是正确的,并且该示例在Chrome 43+中可用(并且打开/而不是https://example.com也可以在Chrome中使用42)。

关于google-chrome - client.openWindow()“不允许打开窗口。”在serviceWorker Google Chrome上,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/30302636/

10-11 13:12