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                                <h1 id="form-handling">Form Handling</h1>
<p>When using Vuex in strict mode, it could be a bit tricky to use <code>v-model</code> on a piece of state that belongs to Vuex:</p>
<pre class="language-"><code class="lang-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name">v-model</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">&quot;</span>obj.message<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
</code></pre>
<p>Assuming <code>obj</code> is a computed property that returns an Object from the store, the <code>v-model</code> here will attempt to directly mutate <code>obj.message</code> when the user types in the input. In strict mode, this will result in an error because the mutation is not performed inside an explicit Vuex mutation handler.</p>
<p>The &quot;Vuex way&quot; to deal with it is binding the <code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span><span class="token punctuation">&gt;</span></span></code>&apos;s value and call an action on the <code>input</code> or <code>change</code> event:</p>
<pre class="language-"><code class="lang-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name">:value</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">&quot;</span>message<span class="token punctuation">&quot;</span></span> <span class="token attr-name">@input</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">&quot;</span>updateMessage<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
</code></pre>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// ...</span>
computed<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  <span class="token operator">...</span><span class="token function">mapState</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    message<span class="token punctuation">:</span> state <span class="token operator">=</span><span class="token operator">&gt;</span> state<span class="token punctuation">.</span>obj<span class="token punctuation">.</span>message
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
methods<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  updateMessage <span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>$store<span class="token punctuation">.</span><span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;updateMessage&apos;</span><span class="token punctuation">,</span> e<span class="token punctuation">.</span>target<span class="token punctuation">.</span>value<span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>And here&apos;s the mutation handler:</p>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// ...</span>
mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  updateMessage <span class="token punctuation">(</span>state<span class="token punctuation">,</span> message<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    state<span class="token punctuation">.</span>obj<span class="token punctuation">.</span>message <span class="token operator">=</span> message
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="two-way-computed-property">Two-way Computed Property</h3>
<p>Admittedly, the above is quite a bit more verbose than <code>v-model</code> + local state, and we lose some of the useful features from <code>v-model</code> as well. An alternative approach is using a two-way computed property with a setter:</p>
<pre class="language-"><code class="lang-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name">v-model</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">&quot;</span>message<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
</code></pre>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// ...</span>
computed<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  message<span class="token punctuation">:</span> <span class="token punctuation">{</span>
    <span class="token keyword">get</span> <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">this</span><span class="token punctuation">.</span>$store<span class="token punctuation">.</span>state<span class="token punctuation">.</span>obj<span class="token punctuation">.</span>message
    <span class="token punctuation">}</span><span class="token punctuation">,</span>
    <span class="token keyword">set</span> <span class="token punctuation">(</span>value<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span>$store<span class="token punctuation">.</span><span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;updateMessage&apos;</span><span class="token punctuation">,</span> value<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>

                                
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