user-attention v1.0.3

user-attention

A simple library to detect user's attention on page.

We don't introduce any intelligent solution, just a deadly simple detection that:

• When user continuously interact with document (mouse events, keyboard events, touch events, etc...), it is active.
• When document is hidden or window is blurred, it is inactive.
• When user idles for a certain time, it is a "unknown" state.

In the future we may improve this algorithm by detecting more evidences like playing <video> tags.

API

We expose a single create function:

const create = (options: Options) => AttentionContext;

type AttentionState = 'active' | 'inactive' | 'unknown';

interface AttentionContext {
    subscribe(callback: () => void): () => void;
    dispose(): void;
    getState(): AttentionState;
    getLastActionAt(): number;
}

interface Options {
    readonly maxIdleTime?: number;
}

By subscribe we can listen to change of user attention state, getState and getLastActionAt will provide current attention states.

const attention = create();

attention.subscribe(() => {
    console.log(`Currently user is ${attention.getState()}`);
});