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  137. <h1>
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  139. <a href="." >Actions</a>
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  146. <section class="normal markdown-section">
  147. <h1 id="actions">Actions</h1>
  148. <p>Actions are similar to mutations, the differences being that:</p>
  149. <ul>
  150. <li>Instead of mutating the state, actions commit mutations.</li>
  151. <li>Actions can contain arbitrary asynchronous operations.</li>
  152. </ul>
  153. <p>Let&apos;s register a simple action:</p>
  154. <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>
  155. state<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  156. count<span class="token punctuation">:</span> <span class="token number">0</span>
  157. <span class="token punctuation">}</span><span class="token punctuation">,</span>
  158. mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  159. increment <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token punctuation">{</span>
  160. state<span class="token punctuation">.</span>count<span class="token operator">++</span>
  161. <span class="token punctuation">}</span>
  162. <span class="token punctuation">}</span><span class="token punctuation">,</span>
  163. actions<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  164. increment <span class="token punctuation">(</span>context<span class="token punctuation">)</span> <span class="token punctuation">{</span>
  165. 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>
  166. <span class="token punctuation">}</span>
  167. <span class="token punctuation">}</span>
  168. <span class="token punctuation">}</span><span class="token punctuation">)</span>
  169. </code></pre>
  170. <p>Action handlers receive a context object which exposes the same set of methods/properties on the store instance, so you can call <code>context.commit</code> to commit a mutation, or access the state and getters via <code>context.state</code> and <code>context.getters</code>. We will see why this context object is not the store instance itself when we introduce <a href="modules.html">Modules</a> later.</p>
  171. <p>In practice, we often use ES2015 <a href="https://github.com/lukehoban/es6features#destructuring" target="_blank">argument destructuring</a> to simplify the code a bit (especially when we need to call <code>commit</code> multiple times):</p>
  172. <pre class="language-"><code class="lang-js">actions<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  173. 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>
  174. <span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;increment&apos;</span><span class="token punctuation">)</span>
  175. <span class="token punctuation">}</span>
  176. <span class="token punctuation">}</span>
  177. </code></pre>
  178. <h3 id="dispatching-actions">Dispatching Actions</h3>
  179. <p>Actions are triggered with the <code>store.dispatch</code> method:</p>
  180. <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>
  181. </code></pre>
  182. <p>This may look dumb at first sight: if we want to increment the count, why don&apos;t we just call <code>store.commit(&apos;increment&apos;)</code> directly? Remember that <strong>mutations have to be synchronous</strong>? Actions don&apos;t. We can perform <strong>asynchronous</strong> operations inside an action:</p>
  183. <pre class="language-"><code class="lang-js">actions<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  184. 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>
  185. <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>
  186. <span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;increment&apos;</span><span class="token punctuation">)</span>
  187. <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token number">1000</span><span class="token punctuation">)</span>
  188. <span class="token punctuation">}</span>
  189. <span class="token punctuation">}</span>
  190. </code></pre>
  191. <p>Actions support the same payload format and object-style dispatch:</p>
  192. <pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// dispatch with a payload</span>
  193. 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>
  194. amount<span class="token punctuation">:</span> <span class="token number">10</span>
  195. <span class="token punctuation">}</span><span class="token punctuation">)</span>
  196. <span class="token comment" spellcheck="true">// dispatch with an object</span>
  197. store<span class="token punctuation">.</span><span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  198. type<span class="token punctuation">:</span> <span class="token string">&apos;incrementAsync&apos;</span><span class="token punctuation">,</span>
  199. amount<span class="token punctuation">:</span> <span class="token number">10</span>
  200. <span class="token punctuation">}</span><span class="token punctuation">)</span>
  201. </code></pre>
  202. <p>A more practical example of real-world actions would be an action to checkout a shopping cart, which involves <strong>calling an async API</strong> and <strong>committing multiple mutations</strong>:</p>
  203. <pre class="language-"><code class="lang-js">actions<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  204. 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>
  205. <span class="token comment" spellcheck="true">// save the items currently in the cart</span>
  206. <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>
  207. <span class="token comment" spellcheck="true">// send out checkout request, and optimistically</span>
  208. <span class="token comment" spellcheck="true">// clear the cart</span>
  209. <span class="token function">commit</span><span class="token punctuation">(</span>types<span class="token punctuation">.</span>CHECKOUT_REQUEST<span class="token punctuation">)</span>
  210. <span class="token comment" spellcheck="true">// the shop API accepts a success callback and a failure callback</span>
  211. shop<span class="token punctuation">.</span><span class="token function">buyProducts</span><span class="token punctuation">(</span>
  212. products<span class="token punctuation">,</span>
  213. <span class="token comment" spellcheck="true">// handle success</span>
  214. <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>
  215. <span class="token comment" spellcheck="true">// handle failure</span>
  216. <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>
  217. <span class="token punctuation">)</span>
  218. <span class="token punctuation">}</span>
  219. <span class="token punctuation">}</span>
  220. </code></pre>
  221. <p>Note we are performing a flow of asynchronous operations, and recording the side effects (state mutations) of the action by committing them.</p>
  222. <h3 id="dispatching-actions-in-components">Dispatching Actions in Components</h3>
  223. <p>You can dispatch actions in components with <code>this.$store.dispatch(&apos;xxx&apos;)</code>, or use the <code>mapActions</code> helper which maps component methods to <code>store.dispatch</code> calls (requires root <code>store</code> injection):</p>
  224. <pre class="language-"><code class="lang-js"><span class="token keyword">import</span> <span class="token punctuation">{</span> mapActions <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;vuex&apos;</span>
  225. <span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token punctuation">{</span>
  226. <span class="token comment" spellcheck="true">// ...</span>
  227. methods<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  228. <span class="token operator">...</span><span class="token function">mapActions</span><span class="token punctuation">(</span><span class="token punctuation">[</span>
  229. <span class="token string">&apos;increment&apos;</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true">// map `this.increment()` to `this.$store.dispatch(&apos;increment&apos;)`</span>
  230. <span class="token comment" spellcheck="true">// `mapActions` also supports payloads:</span>
  231. <span class="token string">&apos;incrementBy&apos;</span> <span class="token comment" spellcheck="true">// map `this.incrementBy(amount)` to `this.$store.dispatch(&apos;incrementBy&apos;, amount)`</span>
  232. <span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
  233. <span class="token operator">...</span><span class="token function">mapActions</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  234. add<span class="token punctuation">:</span> <span class="token string">&apos;increment&apos;</span> <span class="token comment" spellcheck="true">// map `this.add()` to `this.$store.dispatch(&apos;increment&apos;)`</span>
  235. <span class="token punctuation">}</span><span class="token punctuation">)</span>
  236. <span class="token punctuation">}</span>
  237. <span class="token punctuation">}</span>
  238. </code></pre>
  239. <h3 id="composing-actions">Composing Actions</h3>
  240. <p>Actions are often asynchronous, so how do we know when an action is done? And more importantly, how can we compose multiple actions together to handle more complex async flows?</p>
  241. <p>The first thing to know is that <code>store.dispatch</code> can handle Promise returned by the triggered action handler and it also returns Promise:</p>
  242. <pre class="language-"><code class="lang-js">actions<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  243. 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>
  244. <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>
  245. <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>
  246. <span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;someMutation&apos;</span><span class="token punctuation">)</span>
  247. <span class="token function">resolve</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  248. <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token number">1000</span><span class="token punctuation">)</span>
  249. <span class="token punctuation">}</span><span class="token punctuation">)</span>
  250. <span class="token punctuation">}</span>
  251. <span class="token punctuation">}</span>
  252. </code></pre>
  253. <p>Now you can do:</p>
  254. <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>
  255. <span class="token comment" spellcheck="true">// ...</span>
  256. <span class="token punctuation">}</span><span class="token punctuation">)</span>
  257. </code></pre>
  258. <p>And also in another action:</p>
  259. <pre class="language-"><code class="lang-js">actions<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  260. <span class="token comment" spellcheck="true">// ...</span>
  261. 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>
  262. <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>
  263. <span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;someOtherMutation&apos;</span><span class="token punctuation">)</span>
  264. <span class="token punctuation">}</span><span class="token punctuation">)</span>
  265. <span class="token punctuation">}</span>
  266. <span class="token punctuation">}</span>
  267. </code></pre>
  268. <p>Finally, if we make use of <a href="https://tc39.github.io/ecmascript-asyncawait/" target="_blank">async / await</a>, we can compose our actions like this:</p>
  269. <pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// assuming `getData()` and `getOtherData()` return Promises</span>
  270. actions<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  271. <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>
  272. <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>
  273. <span class="token punctuation">}</span><span class="token punctuation">,</span>
  274. <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>
  275. <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">// wait for `actionA` to finish</span>
  276. <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>
  277. <span class="token punctuation">}</span>
  278. <span class="token punctuation">}</span>
  279. </code></pre>
  280. <blockquote>
  281. <p>It&apos;s possible for a <code>store.dispatch</code> to trigger multiple action handlers in different modules. In such a case the returned value will be a Promise that resolves when all triggered handlers have been resolved.</p>
  282. </blockquote>
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