Installez @adobe/aem-headless-client-js en exécutant la commande npm install à partir de la racine de votre projet Node.js.

$ npm i @adobe/aem-headless-client-js

Cet exemple de code montre comment effectuer des requêtes sur AEM à l’aide du module npm @adobe/aem-headless-client-js utilisant une syntaxe async/await. Le SDK d’AEM Headless pour JavaScript prend également en charge la syntaxe de promesse.

Ce code suppose qu’une requête persistante avec le nom wknd/adventureNames a été créée sur l’instance de création AEM et publiée sur l’instance de publication AEM.

import AEMHeadless from '@adobe/aem-headless-client-js';

// Initialize the AEMHeadless client with connection details
const aemHeadlessClient = new AEMHeadless({
    serviceURL: 'https://publish-p123-e789.adobeaemcloud.com',  // The AEM environment to query, this can be pulled out to env variables
    endpoint: '/content/cq:graphql/wknd-shared/endpoint.json',  // The AEM GraphQL endpoint, this is not used when invoking persisted queries.
})

/**
 * Uses the AEM Headless SDK to execute a persisted query with optional query variables.

 * @param {String} persistedQueryName the fully qualified name of the persisted query
 * @param {*} queryParameters an optional JavaScript object containing query parameters
 * @returns the GraphQL data or an error message
 */
export async function executePersistedQuery(persistedQueryName, queryParameters) {
    let data;
    let errors;

    try {
        // AEM GraphQL queries are asynchronous, either await their return or use Promise-based .then(..) { ... } syntax
        const response = await aemHeadlessClient.runPersistedQuery(persistedQueryName, queryParameters);
        // The GraphQL data is stored on the response's data field
        data = response.data;
    } catch (e) {
        console.error(e.toJSON())
        errors = e;
    }

    return { data, errors };
};

// Execute the persisted query using its name 'wknd-shared/adventures-by-slug' and optional query variables
let { data, errors } = executePersistedQuery('wknd-shared/adventures-by-slug', { "slug": "bali-surf-camp" });

Installez @adobe/aem-headless-client-js en exécutant la commande npm install à partir de la racine de votre projet React.

$ npm i @adobe/aem-headless-client-js

Cet exemple de code montre comment utiliser le hook React useEffect(…) pour exécuter un appel asynchrone vers AEM GraphQL.

L’utilisation de useEffect pour effectuer l’appel GraphQL asynchrone dans React est utile car :

1. cela fournit un wrapper synchrone pour l’appel asynchrone à AEM ;
2. cela réduit les nouvelles requêtes inutiles dans AEM.

Ce code suppose qu‘une requête persistante avec le nom wknd-shared/adventure-by-slug a été créée sur l’instance de création AEM et publiée sur l’instance de publication AEM à l’aide de GraphiQL.

import AEMHeadless from '@adobe/aem-headless-client-js';
import { useEffect, useState } from "react";

// Initialize the AEMHeadless client with connection details
const aemHeadlessClient = new AEMHeadless({
    serviceURL: 'https://publish-p123-e789.adobeaemcloud.com', // The AEM environment to query
    endpoint: '/content/cq:graphql/wknd-shared/endpoint.json'         // The AEM GraphQL endpoint, this is not used when invoking persisted queries.
})

/**
 * Private, shared function that invokes the AEM Headless client.
 * React components/views will invoke GraphQL via the custom React useEffect hooks defined below.
 *
 * @param {String} persistedQueryName the fully qualified name of the persisted query
 * @param {*} queryParameters an optional JavaScript object containing query parameters
 * @returns the GraphQL data or an error message
 */
async function fetchPersistedQuery(persistedQueryName, queryParameters) {
  let data;
  let err;

  try {
    // AEM GraphQL queries are asynchronous, either await their return or use Promise-based .then(..) { ... } syntax
    const response = await aemHeadlessClient.runPersistedQuery(
      persistedQueryName,
      queryParameters
    );
    // The GraphQL data is stored on the response's data field
    data = response?.data;
  } catch (e) {
    // An error occurred, return the error messages
    err = e
      .toJSON()
      ?.map((error) => error.message)
      ?.join(", ");
    console.error(e.toJSON());
  }

  return { data, err };
}

/**
 * Calls the 'wknd-shared/adventure-by-slug' and provided the {slug} as the persisted query's `slug` parameter.
 *
 * @param {String!} slug the unique slug used to specify the adventure to return
 * @returns a JSON object representing the adventure
 */
export function useAdventureBySlug(slug) {
  const [adventure, setAdventure] = useState(null);
  const [errors, setErrors] = useState(null);

  useEffect(() => {
    async function fetchData() {
      // The key is the variable name as defined in the persisted query, and may not match the model's field name
      const queryParameters = { slug: slug };

      // Invoke the persisted query, and pass in the queryParameters object as the 2nd parameter
      const { data, err } = await fetchPersistedQuery(
        "wknd-shared/adventure-by-slug",
        queryParameters
      );

      if (err) {
        // Capture errors from the HTTP request
        setErrors(err);
      } else if (data?.adventureList?.items?.length === 1) {
        // Set the adventure data after data validation (there should only be 1 matching adventure)
        setAdventure(data.adventureList.items[0]);
      } else {
        // Set an error if no adventure could be found
        setErrors(`Cannot find adventure with slug: ${slug}`);
      }
    }
    fetchData();
  }, [slug]);

  return { adventure, errors };
}

Appelez le hook React personnalisé useEffect depuis un autre endroit dans un composant React.

import useAdventureBySlug from '...';

let { data, errors } = useAdventureBySlug('bali-surf-camp');

De nouveaux hooks useEffect peuvent être créés pour chaque requête persistante utilisée par l’application React.