PerformanceEventTiming: interactionId property

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The read-only interactionId property returns an ID that uniquely identifies a user interaction which triggered a series of associated events.

Description

When a user interacts with a web page, a user interaction (for example a click) usually triggers a sequence of events, such as pointerdown, pointerup, and click events. To measure the latency of this series of events, the events share the same interactionId.

An interactionId is only computed for the following event types belonging to a user interaction. It is 0 otherwise.

Event types User interaction
pointerdown, pointerup, click click / tap / drag
keydown, keyup key press

Value

A number.

Examples

Using interactionId

The following example collects event duration for all events corresponding to an interaction. The eventLatencies map can then be used to find events with maximum duration for a user interaction, for example.

js
// The key is the interaction ID.
let eventLatencies = {};

const observer = new PerformanceObserver((list) => {
  list.getEntries().forEach((entry) => {
    if (entry.interactionId > 0) {
      const interactionId = entry.interactionId;
      if (!eventLatencies.has(interactionId)) {
        eventLatencies[interactionId] = [];
      }
      eventLatencies[interactionId].push(entry.duration);
    }
  });
});

observer.observe({ type: "event", buffered: true });

// Log events with maximum event duration for a user interaction
Object.entries(eventLatencies).forEach(([k, v]) => {
  console.log(Math.max(...v));
});

Specifications

Specification
Event Timing API
# dom-performanceeventtiming-interactionid

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
interactionId
Experimental

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.