Online Status

2021年4月12日
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Some browsers implement Online/Offline events from the WHATWG Web Applications 1.0 specification.Overview
In order to build a good offline-capable web application, you need to know when your application is actually offline. You also need to know when your application has returned to an ’online’ status again. Effectively, the requirements break down as such:
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*In order to build a good offline-capable web application, you need to know when your application is actually offline. You also need to know when your application has returned to an ’online’ status again. Effectively, the requirements break down as such: You need to know when the user comes back online, so that you can re-synchronize with the.
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*You need to know when the user comes back online, so that you can re-synchronize with the server.
*You need to know when the user is offline, so that you can queue your server requests for a later time.
It is this process that online/offline events help to simplify.
Unfortunately, these events aren’t fully reliable. If you need greater reliability, or if the API isn’t implemented in the browser, you can use other signals to detect if you are offline including using service workers and responses from XMLHttpRequest.APInavigator.onLine
navigator.onLine is a property that maintains a true/false value (true for online, false for offline).
This property is updated whenever the user switches into ’Offline Mode’ (File → Work Offline in Firefox). Additionally, this property should update whenever a browser is no longer capable of connecting to the network. According to the specification:The navigator.onLine attribute must return false if the user agent will not contact the network when the user follows links or when a script requests a remote page (or knows that such an attempt would fail)...
Firefox 2 updates this property when switching to/from the browser’s Offline mode. Firefox 41 updates this property also when the OS reports a change in network connectivity on Windows, Linux, and OS X.
This property existed in older versions of Firefox and Internet Explorer (the specification based itself off of these prior implementations), so you can begin using it immediately. Network status autodetection was implemented in Firefox 2.’online’ and ’offline’ events
Firefox 3 introduces two new events: ’online’ and ’offline’. These two events are fired on the <body> of each page when the browser switches between online and offline mode. Additionally, the events bubble up from document.body, to document, ending at window. Both events are non-cancellable (you can’t prevent the user from coming online, or going offline).
Firefox 41 fires these events when the OS reports a change in network connectivity on Windows, Linux, and OS X.
You can register listeners for these events in a few familiar ways:
*using addEventListener on the window, document, or document.body
*by setting the .ononline or .onoffline properties on document or document.body to a JavaScript Function object. (Note: using window.ononline or window.onoffline will not work for compatibility reasons.)
*by specifying ononline=’...’ or onoffline=’...’ attributes on the <body> tag in the HTML markup.Example
There’s a simple test case that you can run to verify that the events are working (does not work in Chrome due to attaching the event listener to document.body).
Here’s the JavaScript part:
A touch of CSS
And the corresponding HTMLXXX When mochitests for this are created, point to those instead and update this example -nickolay
Here’s the live resultOnline Status SassaNotes
If the API isn’t implemented in the browser, you can use other signals to detect if you are offline including using service workers and responses from XMLHttpRequest.References
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