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class="VPDoc has-sidebar has-aside" data-v-91765379 data-v-83890dd9><!--[--><!--]--><div class="container" data-v-83890dd9><div class="aside" data-v-83890dd9><div class="aside-curtain" data-v-83890dd9></div><div class="aside-container" data-v-83890dd9><div class="aside-content" data-v-83890dd9><div class="VPDocAside" data-v-83890dd9 data-v-6d7b3c46><!--[--><!--]--><!--[--><!--]--><nav aria-labelledby="doc-outline-aria-label" class="VPDocAsideOutline" data-v-6d7b3c46 data-v-b38bf2ff><div class="content" data-v-b38bf2ff><div class="outline-marker" data-v-b38bf2ff></div><div aria-level="2" class="outline-title" id="doc-outline-aria-label" role="heading" data-v-b38bf2ff>On this page</div><ul class="VPDocOutlineItem root" data-v-b38bf2ff data-v-3f927ebe><!--[--><!--]--></ul></div></nav><!--[--><!--]--><div class="spacer" data-v-6d7b3c46></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-83890dd9><div class="content-container" data-v-83890dd9><!--[--><!--]--><main class="main" data-v-83890dd9><div style="position:relative;" class="vp-doc _sigpro_plugins_core_fetch" data-v-83890dd9><div><h1 id="data-fetching-fetch" tabindex="-1">Data Fetching: <code>_fetch</code> <a class="header-anchor" href="#data-fetching-fetch" aria-label="Permalink to "Data Fetching: `_fetch`""></a></h1><p>The <strong>Fetch Plugin</strong> provides a reactive wrapper around the native browser Fetch API. Instead of managing complex <code>async/await</code> flows within your UI, <code>_fetch</code> returns a "Reactive Tripod" (Data, Loading, and Error) that your components can listen to automatically.</p><h2 id="_1-core-concept" tabindex="-1">1. Core Concept <a class="header-anchor" href="#_1-core-concept" aria-label="Permalink to "1. Core Concept""></a></h2><p>When you call <code>_fetch</code>, it returns three signals immediately. Your UI declares how to react to these signals as they change from their initial state to the final response.</p><ul><li><strong><code>$data</code></strong>: Initialized as <code>null</code>. Automatically holds the JSON response on success.</li><li><strong><code>$loading</code></strong>: Initialized as <code>true</code>. Flips to <code>false</code> once the request settles.</li><li><strong><code>$error</code></strong>: Initialized as <code>null</code>. Holds the error message if the request fails.</li></ul><hr><h2 id="_2-installation" tabindex="-1">2. Installation <a class="header-anchor" href="#_2-installation" aria-label="Permalink to "2. Installation""></a></h2><p>Register the <code>Fetch</code> plugin in your <code>main.js</code>. By convention, we load it alongside the UI and Router to have the full SigPro ecosystem ready.</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { $ } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 'sigpro'</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { Fetch } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 'sigpro/plugins'</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">$.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">plugin</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">([Fetch]).</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">then</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // Now _fetch() is available globally</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">'./App.js'</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">).</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">then</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">app</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> $.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">mount</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(app.default));</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">});</span></span></code></pre></div><hr><h2 id="_3-basic-usage" tabindex="-1">3. Basic Usage <a class="header-anchor" href="#_3-basic-usage" aria-label="Permalink to "3. Basic Usage""></a></h2><p>Use <code>_fetch</code> inside your component to get live updates. The UI updates surgically whenever a signal changes.</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> default</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> () </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> const</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">$data</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">$loading</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">$error</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> _fetch</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">'https://api.github.com/users/octocat'</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> return</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> div</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">({ class: </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">'p-6 flex flex-col gap-4'</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }, [</span></span>
|
||
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> h1</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"Profile Details"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">),</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> </span></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // 1. Loading State (using SigPro UI button)</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> () </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=></span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> $loading</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">&&</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> _button</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">({ $loading: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">true</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }, </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"Fetching..."</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">),</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // 2. Error State</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> () </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=></span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> $error</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">&&</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> div</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">({ class: </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">'alert alert-error'</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }, </span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">$error</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">()),</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // 3. Success State</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> () </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=></span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> $data</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">&&</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> div</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">({ class: </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">'card bg-base-200 p-4'</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }, [</span></span>
|
||
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> img</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">({ src: </span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">$data</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">().avatar_url, class: </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">'w-16 rounded-full'</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }),</span></span>
|
||
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> h2</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">$data</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">().name),</span></span>
|
||
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> p</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">$data</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">().bio)</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> ])</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> ]);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">};</span></span></code></pre></div><hr><h2 id="_4-advanced-configuration" tabindex="-1">4. Advanced Configuration <a class="header-anchor" href="#_4-advanced-configuration" aria-label="Permalink to "4. Advanced Configuration""></a></h2><p><code>_fetch</code> accepts the same <code>RequestInit</code> options as the standard <code>fetch()</code> (methods, headers, body, etc.).</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">$data</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">$loading</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> _fetch</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">'/api/v1/update'</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, {</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> method: </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">'PATCH'</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">,</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> headers: { </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">'Content-Type'</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">'application/json'</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> },</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> body: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">JSON</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">stringify</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">({ status: </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">'active'</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> })</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">});</span></span></code></pre></div><hr><h2 id="_5-why-use-fetch-instead-of-native-fetch" tabindex="-1">5. Why use <code>_fetch</code> instead of native Fetch? <a class="header-anchor" href="#_5-why-use-fetch-instead-of-native-fetch" aria-label="Permalink to "5. Why use `_fetch` instead of native Fetch?""></a></h2><ol><li><strong>Declarative UI</strong>: You define the "Loading", "Error", and "Success" templates once, and they swap automatically.</li><li><strong>No <code>useEffect</code> required</strong>: Since SigPro is natively reactive, you don't need lifecycle hooks to trigger re-renders; the signals handle it.</li><li><strong>Consistency</strong>: It follows the same <code>_prefix</code> pattern as the rest of the official plugin ecosystem.</li><li><strong>Automatic JSON Parsing</strong>: It assumes JSON by default and handles 404/500 errors by populating the <code>$error</code> signal.</li></ol></div></div></main><footer class="VPDocFooter" data-v-83890dd9 data-v-4f9813fa><!--[--><!--]--><!----><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-4f9813fa><span class="visually-hidden" id="doc-footer-aria-label" data-v-4f9813fa>Pager</span><div class="pager" data-v-4f9813fa><a class="VPLink link pager-link prev" href="/sigpro/plugins/core.ui.html" data-v-4f9813fa><!--[--><span class="desc" data-v-4f9813fa>Previous page</span><span class="title" data-v-4f9813fa>@core UI Plugin</span><!--]--></a></div><div class="pager" data-v-4f9813fa><a class="VPLink link pager-link next" href="/sigpro/plugins/core.storage.html" data-v-4f9813fa><!--[--><span class="desc" data-v-4f9813fa>Next page</span><span class="title" data-v-4f9813fa>@core UI Storage</span><!--]--></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><!----><!--[--><!--]--></div></div>
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