From the course: JavaScript: Service Workers

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Work with the registration - JavaScript Tutorial

From the course: JavaScript: Service Workers

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- [Instructor] I'm in 02_07 > Begin project and I'm inside the index.html. When we were registering the serviceWorker, we need to remember that we receive a promise. When that promise give us the callback when that promise was fulfilled, we're going to receive a registration object. That object is important because there are several events that we combine to the registration, also there are some properties that we can listen to, for example, when we check the registration object, we can verify if there is an actual active serviceWorker currently available and it will give us the active serviceWorker. So, for example, we can listen to events for that serviceWorker such as onerror or onstatechange in the case that serviceWorker, for example, is going to be replaced by a new one. Also we can check its scriptURL and current state. Active is not the only serviceWorker that we can check. We can also check if there is any waiting serviceWorker. That's another serviceWorker with the same API…

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