ServiceWorkerContainer
Experimental
Это экспериментальная технология
Так как спецификация этой технологии ещё не стабилизировалась, смотрите таблицу совместимости по поводу использования в различных браузерах. Также заметьте, что синтаксис и поведение экспериментальной технологии может измениться в будущих версиях браузеров, вслед за изменениями спецификации.
ServiceWorker API предоставляет интерфейс ServiceWorkerContainer
, являющийся объектом (объект представляет собой сервис воркер, как единое целое в сетевой экосистеме) включающим следующие средства:
Регистрация;
Отмена регистрации;
Обновление сервис воркеров;
Доступ к состоянию сервис воркеров;
Доступ к регистрации сервис воркеров.
Most importantly, it exposes the ServiceWorkerContainer.register(scriptURL, scope[, base])
method used to register service workers, and the ServiceWorkerContainer.controller
property used to determine whether or not the current page is actively controlled.
Properties
ServiceWorkerContainer.controller
Только для чтения- Returns a
ServiceWorker
object if its state isactivated
(the same object returned byServiceWorkerRegistration.active
(en-US)). This property returnsnull
if the request is a force refresh (Shift + refresh) or if there is no active worker.
ServiceWorkerContainer.ready
(en-US) Только для чтения- Defines whether a service worker is ready to control a page or not. It returns a
Promise
that will never reject, which resolves to aServiceWorkerRegistration
with anServiceWorkerRegistration.active
(en-US) worker.
Event handlers
ServiceWorkerContainer.oncontrollerchange
(en-US)- An event handler fired whenever a
controllerchange
event occurs — when the document's associatedServiceWorkerRegistration
acquires a newServiceWorkerRegistration.active
(en-US) worker. ServiceWorkerContainer.onerror
(en-US)- An event handler fired whenever an
error (en-US)
event occurs in the associated service workers. ServiceWorkerContainer.onmessage
(en-US)- An event handler fired whenever a
message
event occurs — when incoming messages are received to theServiceWorkerContainer
object (e.g. via aMessagePort.postMessage()
(en-US) call.)
Methods
ServiceWorkerContainer.register()
- Creates or updates a
ServiceWorkerRegistration
for the givenscriptURL
. ServiceWorkerContainer.getRegistration()
(en-US)- Gets a
ServiceWorkerRegistration
object whose scope URL matches the provided document URL. If the method can't return aServiceWorkerRegistration
, it returns aPromise
. ServiceWorkerContainer.getRegistrations()
(en-US)- Returns all
ServiceWorkerRegistration
s associated with aServiceWorkerContainer
in an array. If the method can't returnServiceWorkerRegistration
s, it returns aPromise
.
Examples
This code snippet is from the service worker fallback-response sample (see fallback-response live). The code checks to see if the browser supports service workers. Then the code registers the service worker and determines if the page is actively controlled by the service worker. If it isn't, it prompts the user to reload the page so the service worker can take control. The code also reports any registration failures.
if ('serviceWorker' in navigator) {
navigator.serviceWorker.register('service-worker.js', {scope: './'}).then(function() {
if (navigator.serviceWorker.controller) {
document.querySelector('#status').textContent = 'The service worker is currently handling network operations.';
showRequestButtons();
} else {
document.querySelector('#status').textContent = 'Please reload this page to allow the service worker to handle network operations.';
}
}).catch(function(error) {
document.querySelector('#status').textContent = error;
});
} else {
var aElement = document.createElement('a');
aElement.href = 'http://www.chromium.org/blink/serviceworker/service-worker-faq';
aElement.textContent = 'unavailable';
document.querySelector('#status').appendChild(aElement);
}
Specifications
Specification | Status | Comment |
---|---|---|
Service Workers Определение 'ServiceWorkerContainer' в этой спецификации. |
Рабочий черновик | Initial definition. |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support | 40.0 | 44.0 (44.0)[1] | Нет | 24 | Нет |
Feature | Android | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
---|---|---|---|---|---|---|---|
Basic support | ? | 44.0 (44.0) | (Да) | Нет | ? | Нет | ? |
[1] Service workers (and Push) have been disabled in the Firefox 45 Extended Support Release (ESR.)