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Update analytics data sending method #4002

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Update analytics data sending method #4002

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8212df2
Update analytics data sending method
Shrishti0423 Oct 22, 2026
1a7496a
Fix analytics reporting on visibility change
Shrishti0423 Nov 3, 2026
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15 changes: 10 additions & 5 deletions 2-ui/5-loading/01-onload-ondomcontentloaded/article.md
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Expand Up @@ -133,20 +133,25 @@ The notable exception is sending analytics.

Let's say we gather data about how the page is used: mouse clicks, scrolls, viewed page areas, and so on.

Naturally, `unload` event is when the user leaves us, and we'd like to save the data on our server.
When the page becomes hidden, we may want to save the collected data on our server. The `visibilitychange` event is useful for this: it fires when the user switches tabs, minimizes the browser, or leaves the page.

There exists a special `navigator.sendBeacon(url, data)` method for such needs, described in the specification <https://w3c.github.io/beacon/>.

It sends the data in background. The transition to another page is not delayed: the browser leaves the page, but still performs `sendBeacon`.
It sends the data in the background. The transition to another page is not delayed: the browser leaves the page, but still performs `sendBeacon`.

Here's how to use it:

```js
let analyticsData = { /* object with gathered data */ };
let analyticsSent = false;

window.addEventListener("unload", function() {
navigator.sendBeacon("/analytics", JSON.stringify(analyticsData));
document.addEventListener("visibilitychange", function() {
if (document.visibilityState === "hidden" && !analyticsSent) {
analyticsSent = navigator.sendBeacon("/analytics", JSON.stringify(analyticsData));
}
});
```
```


- The request is sent as POST.
- We can send not only a string, but also forms and other formats, as described in the chapter <info:fetch>, but usually it's a stringified object.
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