Add an Observer API

[inexorabletash]

Change-tracking events for synchronizing. Basically we need to figure out what primitives we need to provide to allow applications to build synchronizing of IndexedDB databases.

Threads:

• http://lists.w3.org/Archives/Public/public-webapps/2013JanMar/0246.html
• http://lists.w3.org/Archives/Public/www-tag/2013Feb/0023.html
• http://lists.w3.org/Archives/Public/public-webapps/2013JanMar/0447.html

[inexorabletash]

Proposal by Google folks: https://github.com/dmurph/indexed-db-observers

Moz's tracking bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1059724#c1 (and full proposal)

[sicking]

The mozilla link is actually to the full mozilla proposal.

[dmurph]

FYI - the explainer above is not up to date.

We want to remove the transaction feature, and add batching of changes.

[inexorabletash]

TPAC 2019 Web Apps Indexed DB triage notes:

Moving from V3 until any implementer has more certainty about a timeline for implementing.

[Rush]

Any updates?

[dmurph]

On the backburner. We need a partner to run an origin trial with to prioritize this again.

[burtonator]

Hello from 2021 and we still don't have this feature :)

Note that Google Firestore actually implemented their own cross tab communication system handle notifications.

Not sure how they did it.

[aydincandan]

flash, flash : https://github.com/WICG/indexed-db-observers/blob/gh-pages/EXPLAINER.md Experimental

[dberardo-com]

any news on this topic ?

[AshishIvoyant]

Any updates yet?

[osovv]

Waiting for this

[pubkey]

Note that Google Firestore actually implemented their own cross tab communication system handle notifications. Not sure how they did it.

@burtonator I did the same for RxDB with the BroadcastChannel API. Because BroadcastChannel is widely supported since 2022, I think most use cases for IndexedDB observer can be solved by just emitting BroadcastChannel events across browser tabs.