@longsightgroup/qti3-player-preact

Preact TSX adapter for the qti3 assessment item player web component.

The underlying browser primitive remains <qti-assessment-item-player> from @longsightgroup/qti3-player. This package only handles Preact lifecycle wiring, typed callbacks, declarative XML loading, and an imperative ref handle.

Install

npm install @longsightgroup/qti3-player-preact @longsightgroup/qti3-player preact

Use

import { useRef } from "preact/hooks";
import type { PlayerMessageCatalog } from "@longsightgroup/qti3-player";
import {
  QtiAssessmentItemPlayer,
  type QtiAssessmentItemPlayerHandle,
} from "@longsightgroup/qti3-player-preact";

export function Preview({
  candidateSafeXml,
  messageCatalog,
}: {
  candidateSafeXml: string;
  messageCatalog?: PlayerMessageCatalog;
}) {
  const playerRef = useRef<QtiAssessmentItemPlayerHandle>(null);

  return (
    <QtiAssessmentItemPlayer
      ref={playerRef}
      xml={candidateSafeXml}
      languageOfInterface="sv-SE"
      messageCatalog={messageCatalog}
      loadOptions={{
        status: "interacting",
        sessionControl: { validateResponses: false, showFeedback: false },
      }}
      onStateChange={({ state }) => console.log(state)}
      onLoadError={(error) => console.error(error)}
    />
  );
}

Declarative loading

• Pass xml to load an item after mount. Omit xml or set xml={undefined} to clear the player. Clearing does not emit player events; update host state from the prop transition.
• xml="" is not the same as xml={undefined}: an empty string attempts a load and shows a parse error when the XML is invalid.
• Pass messageCatalog for localized player chrome (languageOfInterface alone does not load locale files).
• The adapter reloads when xml, restored loadOptions.state, status, session-control flags, fetchXml, or resolveAsset change.
• Equivalent loadOptions.state objects with different references do not trigger a reload when their serialized content matches. Key order follows object construction order; mutating a state object in place without changing the reload key does not trigger a reload.
• Keep messageCatalog, fetchXml, resolveAsset, and loadOptions object literals stable across renders (useMemo / hooks memoization). New references on every render cause unnecessary resyncs or reloads.
• URL loading stays imperative: ref.current?.loadUrl(url, loadOptions).

Security Boundary

For high-stakes delivery, pass XML that has already been prepared by the host with buildQtiDeliverySafeXml() from @longsightgroup/qti3-core, and gate delivery on that result's ok flag. This adapter does not redact XML, decide deliverability, or perform authoritative server-side scoring.

The ref exposes scoreAttempt() because the web component exposes it. Browser scoring is local preview/convenience scoring only; high-stakes scoring should use scoreQtiItemServerSide() on the server with authoritative XML.