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<!DOCTYPE HTML> <html lang="fr" > <head> <meta charset="UTF-8"> <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> <title>Actions · Vuex</title> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta name="description" content=""> <meta name="generator" content="GitBook 3.2.3"> <link rel="stylesheet" href="../gitbook/style.css"> <link rel="stylesheet" href="../gitbook/gitbook-plugin-prism/prism.css"> <link rel="stylesheet" href="../gitbook/gitbook-plugin-search/search.css"> <link rel="stylesheet" href="../gitbook/gitbook-plugin-theme-vuejs/vue.css"> <meta name="HandheldFriendly" content="true"/> <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no"> <meta name="apple-mobile-web-app-capable" content="yes"> <meta name="apple-mobile-web-app-status-bar-style" content="black"> <link rel="apple-touch-icon-precomposed" sizes="152x152" href="../gitbook/images/apple-touch-icon-precomposed-152.png"> <link rel="shortcut icon" href="../gitbook/images/favicon.ico" type="image/x-icon"> <link rel="next" href="modules.html" /> <link rel="prev" href="mutations.html" /> </head> <body> <div class="book"> <div class="book-summary"> <div id="book-search-input" role="search"> <input type="text" placeholder="Tapez pour rechercher" /> </div> <nav role="navigation"> <script async type="text/javascript" src="//cdn.carbonads.com/carbon.js?zoneid=1673&serve=C6AILKT&placement=vuejs" id="_carbonads_js"></script> <ul class="summary"> <li class="chapter " data-level="1.1" data-path="./"> <a href="./"> Introduction </a> </li> <li class="chapter " data-level="1.2" > <a target="_blank" href="https://github.com/vuejs/vuex/releases"> Notes de version </a> </li> <li class="chapter " data-level="1.3" data-path="installation.html"> <a href="installation.html"> Installation </a> </li> <li class="chapter " data-level="1.4" data-path="intro.html"> <a href="intro.html"> Vuex, qu'est-ce que c'est ? </a> </li> <li class="chapter " data-level="1.5" data-path="getting-started.html"> <a href="getting-started.html"> Pour commencer </a> </li> <li class="chapter " data-level="1.6" data-path="core-concepts.html"> <a href="core-concepts.html"> Concepts de base </a> <ul class="articles"> <li class="chapter " data-level="1.6.1" data-path="state.html"> <a href="state.html"> État </a> </li> <li class="chapter " data-level="1.6.2" data-path="getters.html"> <a href="getters.html"> Accesseurs </a> </li> <li class="chapter " data-level="1.6.3" data-path="mutations.html"> <a href="mutations.html"> Mutations </a> </li> <li class="chapter active" data-level="1.6.4" data-path="actions.html"> <a href="actions.html"> Actions </a> </li> <li class="chapter " data-level="1.6.5" data-path="modules.html"> <a href="modules.html"> Modules </a> </li> </ul> </li> <li class="chapter " data-level="1.7" data-path="structure.html"> <a href="structure.html"> Structure d'une application </a> </li> <li class="chapter " data-level="1.8" data-path="plugins.html"> <a href="plugins.html"> Plugins </a> </li> <li class="chapter " data-level="1.9" data-path="strict.html"> <a href="strict.html"> Mode strict </a> </li> <li class="chapter " data-level="1.10" data-path="forms.html"> <a href="forms.html"> Gestion des formulaires </a> </li> <li class="chapter " data-level="1.11" data-path="testing.html"> <a href="testing.html"> Tests </a> </li> <li class="chapter " data-level="1.12" data-path="hot-reload.html"> <a href="hot-reload.html"> Rechargement à chaud </a> </li> <li class="chapter " data-level="1.13" data-path="api.html"> <a href="api.html"> Documentation de l'API </a> </li> <li class="divider"></li> <li> <a href="https://www.gitbook.com" target="blank" class="gitbook-link"> Publié avec GitBook </a> </li> </ul> </nav> </div> <div class="book-body"> <div class="body-inner"> <div class="book-header" role="navigation"> <!-- Title --> <h1> <i class="fa fa-circle-o-notch fa-spin"></i> <a href="." >Actions</a> </h1> </div> <div class="page-wrapper" tabindex="-1" role="main"> <div class="page-inner"> <div id="book-search-results"> <div class="search-noresults"> <section class="normal markdown-section"> <h1 id="actions">Actions</h1> <p>Les actions sont similaires aux mutations, &#xE0; la diff&#xE9;rence que :</p> <ul> <li>Au lieu de modifier l&apos;&#xE9;tat, les actions actent des mutations.</li> <li>Les actions peuvent contenir des op&#xE9;rations asynchrones.</li> </ul> <p>Enregistrons une simple action :</p> <pre class="language-"><code class="lang-js"><span class="token keyword">const</span> store <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Vuex<span class="token punctuation">.</span>Store</span><span class="token punctuation">(</span><span class="token punctuation">{</span> state<span class="token punctuation">:</span> <span class="token punctuation">{</span> count<span class="token punctuation">:</span> <span class="token number">0</span> <span class="token punctuation">}</span><span class="token punctuation">,</span> mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span> increment <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token punctuation">{</span> state<span class="token punctuation">.</span>count<span class="token operator">++</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span><span class="token punctuation">,</span> actions<span class="token punctuation">:</span> <span class="token punctuation">{</span> increment <span class="token punctuation">(</span>context<span class="token punctuation">)</span> <span class="token punctuation">{</span> context<span class="token punctuation">.</span><span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;increment&apos;</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span><span class="token punctuation">)</span> </code></pre> <p>Les gestionnaires d&apos;action re&#xE7;oivent un objet contexte qui expose le m&#xEA;me ensemble de m&#xE9;thodes et propri&#xE9;t&#xE9;s que l&apos;instance du store, donc vous pouvez appeler <code>context.commit</code> pour acter une mutation, ou acc&#xE9;der &#xE0; l&apos;&#xE9;tat et aux accesseurs via <code>context.state</code> et <code>context.getters</code>. Nous verrons pourquoi cet objet contexte n&apos;est pas l&apos;instance du store elle-m&#xEA;me lorsque nous pr&#xE9;senterons les <a href="modules.html">Modules</a> plus tard.</p> <p>En pratique, nous utilisons souvent la <a href="https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Op%C3%A9rateurs/Affecter_par_d%C3%A9composition" target="_blank">d&#xE9;structuration d&apos;argument</a> pour simplifier quelque peu le code (particuli&#xE8;rement si nous avons besoin d&apos;appeler <code>commit</code> plusieurs fois) :</p> <pre class="language-"><code class="lang-js">actions<span class="token punctuation">:</span> <span class="token punctuation">{</span> increment <span class="token punctuation">(</span><span class="token punctuation">{</span> commit <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;increment&apos;</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span> </code></pre> <h3 id="propager-des-actions">Propager des actions</h3> <p>Les actions sont d&#xE9;clench&#xE9;es par la m&#xE9;thode <code>store.dispatch</code> :</p> <pre class="language-"><code class="lang-js">store<span class="token punctuation">.</span><span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token string">&apos;increment&apos;</span><span class="token punctuation">)</span> </code></pre> <p>Cela peut sembler idiot au premier abord : si nous avons besoin d&apos;incr&#xE9;menter le compteur, pourquoi ne pas simplement appeler <code>store.commit(&apos;increment&apos;)</code> directement ? Vous rappelez-vous que <strong>les mutations doivent &#xEA;tre synchrones</strong> ? Les actions ne suivent pas cette r&#xE8;gle. Il est possible de proc&#xE9;der &#xE0; des op&#xE9;rations <strong>asynchrones</strong> dans une action :</p> <pre class="language-"><code class="lang-js">actions<span class="token punctuation">:</span> <span class="token punctuation">{</span> incrementAsync <span class="token punctuation">(</span><span class="token punctuation">{</span> commit <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span> <span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;increment&apos;</span><span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token number">1000</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span> </code></pre> <p>Les actions prennent &#xE9;galement en charge les param&#xE8;tres additionnels (&#xAB; payload &#xBB;) et les objets pour propager :</p> <pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// propager avec un param&#xE8;tre additionnel</span> store<span class="token punctuation">.</span><span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token string">&apos;incrementAsync&apos;</span><span class="token punctuation">,</span> <span class="token punctuation">{</span> amount<span class="token punctuation">:</span> <span class="token number">10</span> <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token comment" spellcheck="true">// propager avec un objet</span> store<span class="token punctuation">.</span><span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token punctuation">{</span> type<span class="token punctuation">:</span> <span class="token string">&apos;incrementAsync&apos;</span><span class="token punctuation">,</span> amount<span class="token punctuation">:</span> <span class="token number">10</span> <span class="token punctuation">}</span><span class="token punctuation">)</span> </code></pre> <p>Un exemple concret d&apos;application serait une action pour vider un panier d&apos;achats, ce qui implique <strong>d&apos;appeler une API asynchrone</strong> et d&apos;<strong>acter de multiples mutations</strong> :</p> <pre class="language-"><code class="lang-js">actions<span class="token punctuation">:</span> <span class="token punctuation">{</span> checkout <span class="token punctuation">(</span><span class="token punctuation">{</span> commit<span class="token punctuation">,</span> state <span class="token punctuation">}</span><span class="token punctuation">,</span> products<span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token comment" spellcheck="true">// sauvegarder les articles actuellement dans le panier</span> <span class="token keyword">const</span> savedCartItems <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token operator">...</span>state<span class="token punctuation">.</span>cart<span class="token punctuation">.</span>added<span class="token punctuation">]</span> <span class="token comment" spellcheck="true">// envoyer la requ&#xEA;te de checkout,</span> <span class="token comment" spellcheck="true">// et vider le panier</span> <span class="token function">commit</span><span class="token punctuation">(</span>types<span class="token punctuation">.</span>CHECKOUT_REQUEST<span class="token punctuation">)</span> <span class="token comment" spellcheck="true">// l&apos;API de la boutique en ligne prend une fonction de rappel en cas de succ&#xE8;s et une autre en cas d&apos;&#xE9;chec</span> shop<span class="token punctuation">.</span><span class="token function">buyProducts</span><span class="token punctuation">(</span> products<span class="token punctuation">,</span> <span class="token comment" spellcheck="true">// g&#xE9;rer le succ&#xE8;s</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token function">commit</span><span class="token punctuation">(</span>types<span class="token punctuation">.</span>CHECKOUT_SUCCESS<span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true">// g&#xE9;rer l&apos;&#xE9;chec</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token function">commit</span><span class="token punctuation">(</span>types<span class="token punctuation">.</span>CHECKOUT_FAILURE<span class="token punctuation">,</span> savedCartItems<span class="token punctuation">)</span> <span class="token punctuation">)</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span> </code></pre> <p>Notez que nous proc&#xE9;dons &#xE0; un flux d&apos;op&#xE9;rations asynchrones, et enregistrons les effets de bord (mutation de l&apos;&#xE9;tat) de l&apos;action en les actant.</p> <h3 id="propager-des-actions-dans-les-composants">Propager des actions dans les composants</h3> <p>Vous pouvez propager des actions dans les composants avec <code>this.$store.dispatch(&apos;xxx&apos;)</code>, ou en utilisant la fonction utilitaire <code>mapActions</code> qui attache les m&#xE9;thodes du composant aux appels de <code>store.dispatch</code> (n&#xE9;cessite l&apos;injection de <code>store</code> &#xE0; la racine) :</p> <pre class="language-"><code class="lang-js"><span class="token keyword">import</span> <span class="token punctuation">{</span> mapActions <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;vuex&apos;</span> <span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token punctuation">{</span> <span class="token comment" spellcheck="true">// ...</span> methods<span class="token punctuation">:</span> <span class="token punctuation">{</span> <span class="token operator">...</span><span class="token function">mapActions</span><span class="token punctuation">(</span><span class="token punctuation">[</span> <span class="token string">&apos;increment&apos;</span> <span class="token comment" spellcheck="true">// attacher `this.increment()` &#xE0; `this.$store.dispatch(&apos;increment&apos;)`</span> <span class="token comment" spellcheck="true">// `mapActions` supporte &#xE9;galement les param&#xE8;tres additionnels :</span> <span class="token string">&apos;incrementBy&apos;</span> <span class="token comment" spellcheck="true">// attacher `this.incrementBy(amount)` &#xE0; `this.$store.dispatch(&apos;incrementBy&apos;, amount)`</span> <span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token operator">...</span><span class="token function">mapActions</span><span class="token punctuation">(</span><span class="token punctuation">{</span> add<span class="token punctuation">:</span> <span class="token string">&apos;increment&apos;</span> <span class="token comment" spellcheck="true">// attacher `this.add()` &#xE0; `this.$store.dispatch(&apos;increment&apos;)`</span> <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span> </code></pre> <h3 id="composer-les-actions">Composer les actions</h3> <p>Les actions sont souvent asynchrones, donc comment savoir lorsqu&apos;une action est termin&#xE9;e ? Et plus important, comment composer plusieurs actions ensemble pour manipuler des flux asynchrones plus complexes ?</p> <p>La premi&#xE8;re chose &#xE0; savoir est que <code>store.dispatch</code> peut g&#xE9;rer la Promesse (&#xAB; Promise &#xBB;) retourn&#xE9;e par le gestionnaire d&apos;action d&#xE9;clench&#xE9; et par cons&#xE9;quent vous pouvez &#xE9;galement retourner une Promesse :</p> <pre class="language-"><code class="lang-js">actions<span class="token punctuation">:</span> <span class="token punctuation">{</span> actionA <span class="token punctuation">(</span><span class="token punctuation">{</span> commit <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">Promise</span><span class="token punctuation">(</span><span class="token punctuation">(</span>resolve<span class="token punctuation">,</span> reject<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span> <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span> <span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;someMutation&apos;</span><span class="token punctuation">)</span> <span class="token function">resolve</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token number">1000</span><span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span> </code></pre> <p>Maintenant vous pouvez faire :</p> <pre class="language-"><code class="lang-js">store<span class="token punctuation">.</span><span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token string">&apos;actionA&apos;</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span> <span class="token comment" spellcheck="true">// ...</span> <span class="token punctuation">}</span><span class="token punctuation">)</span> </code></pre> <p>Et &#xE9;galement dans une autre action :</p> <pre class="language-"><code class="lang-js">actions<span class="token punctuation">:</span> <span class="token punctuation">{</span> <span class="token comment" spellcheck="true">// ...</span> actionB <span class="token punctuation">(</span><span class="token punctuation">{</span> dispatch<span class="token punctuation">,</span> commit <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">return</span> <span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token string">&apos;actionA&apos;</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span> <span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;someOtherMutation&apos;</span><span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span> </code></pre> <p>Pour finir, si nous utilisons <a href="https://tc39.github.io/ecmascript-asyncawait/" target="_blank"><code>async</code> / <code>await</code></a>, nous pouvons composer nos actions ainsi :</p> <pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// sachant que `getData()` et `getOtherData()` retournent des Promesses.</span> actions<span class="token punctuation">:</span> <span class="token punctuation">{</span> <span class="token keyword">async</span> actionA <span class="token punctuation">(</span><span class="token punctuation">{</span> commit <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;gotData&apos;</span><span class="token punctuation">,</span> <span class="token keyword">await</span> <span class="token function">getData</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token keyword">async</span> actionB <span class="token punctuation">(</span><span class="token punctuation">{</span> dispatch<span class="token punctuation">,</span> commit <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">await</span> <span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token string">&apos;actionA&apos;</span><span class="token punctuation">)</span> <span class="token comment" spellcheck="true">// attendre que `actionA` soit finie</span> <span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;gotOtherData&apos;</span><span class="token punctuation">,</span> <span class="token keyword">await</span> <span class="token function">getOtherData</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span> </code></pre> <blockquote> <p>Il est possible pour un <code>store.dispatch</code> de d&#xE9;clencher plusieurs gestionnaires d&apos;action dans diff&#xE9;rents modules. 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