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class="VPLink link link" href="/sigpro/api/signal.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>$ signals</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/watch.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>$watch</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/if.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>$if</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/for.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>$for</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/router.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>$router</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/mount.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>$mount</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/html.html" data-v-a4b0d9bf><!--[--><p class="text" 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data-v-a4b0d9bf>Quick Start</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-a9a9e638 data-v-91765379><div class="VPDoc has-sidebar has-aside" data-v-91765379 data-v-83890dd9><!--[--><!--]--><div class="container" data-v-83890dd9><div class="aside" data-v-83890dd9><div class="aside-curtain" data-v-83890dd9></div><div class="aside-container" data-v-83890dd9><div class="aside-content" data-v-83890dd9><div class="VPDocAside" data-v-83890dd9 data-v-6d7b3c46><!--[--><!--]--><!--[--><!--]--><nav aria-labelledby="doc-outline-aria-label" class="VPDocAsideOutline" data-v-6d7b3c46 data-v-b38bf2ff><div class="content" data-v-b38bf2ff><div class="outline-marker" data-v-b38bf2ff></div><div aria-level="2" class="outline-title" id="doc-outline-aria-label" role="heading" data-v-b38bf2ff>On this page</div><ul class="VPDocOutlineItem root" data-v-b38bf2ff data-v-3f927ebe><!--[--><!--]--></ul></div></nav><!--[--><!--]--><div class="spacer" data-v-6d7b3c46></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-83890dd9><div class="content-container" data-v-83890dd9><!--[--><!--]--><main class="main" data-v-83890dd9><div style="position:relative;" class="vp-doc _sigpro_api_if" data-v-83890dd9><div><h1 id="🔀-reactive-branching-if" tabindex="-1">🔀 Reactive Branching: <code>$if( )</code> <a class="header-anchor" href="#🔀-reactive-branching-if" aria-label="Permalink to "🔀 Reactive Branching: `$if( )`""></a></h1><p>The <code>$if</code> function is a reactive control flow operator. It manages the conditional rendering of components, ensuring that only the active branch exists in the DOM and in memory.</p><h2 id="🛠️-function-signature" tabindex="-1">🛠️ Function Signature <a class="header-anchor" href="#🛠️-function-signature" aria-label="Permalink to "🛠️ Function Signature""></a></h2><div class="language-typescript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">typescript</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">$if</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;"> condition: Signal</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"><</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">boolean</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">></span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> |</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> Function, </span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> thenVal: Component </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">|</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> Node, </span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> otherwiseVal</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">?:</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> Component </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">|</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> Node</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">): HTMLElement</span></span></code></pre></div><table tabindex="0"><thead><tr><th style="text-align:left;">Parameter</th><th style="text-align:left;">Type</th><th style="text-align:left;">Required</th><th style="text-align:left;">Description</th></tr></thead><tbody><tr><td style="text-align:left;"><strong><code>condition</code></strong></td><td style="text-align:left;"><code>Signal</code></td><td style="text-align:left;">Yes</td><td style="text-align:left;">A reactive source that determines which branch to render.</td></tr><tr><td style="text-align:left;"><strong><code>thenVal</code></strong></td><td style="text-align:left;"><code>any</code></td><td style="text-align:left;">Yes</td><td style="text-align:left;">The content to show when the condition is <strong>truthy</strong>.</td></tr><tr><td style="text-align:left;"><strong><code>otherwiseVal</code></strong></td><td style="text-align:left;"><code>any</code></td><td style="text-align:left;">No</td><td style="text-align:left;">The content to show when the condition is <strong>falsy</strong> (defaults to null).</td></tr></tbody></table><p><strong>Returns:</strong> A <code>div</code> element with <code>display: contents</code> that acts as a reactive portal for the branches.</p><hr><h2 id="📖-usage-patterns" tabindex="-1">📖 Usage Patterns <a class="header-anchor" href="#📖-usage-patterns" aria-label="Permalink to "📖 Usage Patterns""></a></h2><h3 id="_1-simple-toggle" tabindex="-1">1. Simple Toggle <a class="header-anchor" href="#_1-simple-toggle" aria-label="Permalink to "1. Simple Toggle""></a></h3><p>The most common use case is showing or hiding a single element based on a state.</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:#005CC5;--shiki-dark:#79B8FF;"> isVisible</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> $</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">false</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:#6F42C1;--shiki-dark:#B392F0;">Div</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">([</span></span>
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<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> Button</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">({ </span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">onclick</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;"> isVisible</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;">isVisible</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">()) }, </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"Toggle Message"</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:#6F42C1;--shiki-dark:#B392F0;"> $if</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(isVisible, </span></span>
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<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> P</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"Now you see me!"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">), </span></span>
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<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> P</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"Now you don't..."</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> )</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">]);</span></span></code></pre></div><h3 id="_2-lazy-component-loading" tabindex="-1">2. Lazy Component Loading <a class="header-anchor" href="#_2-lazy-component-loading" aria-label="Permalink to "2. Lazy Component Loading""></a></h3><p>Unlike using a hidden class (CSS <code>display: none</code>), <code>$if</code> is <strong>lazy</strong>. The branch that isn't active <strong>is never created</strong>. This saves memory and initial processing time.</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:#6F42C1;--shiki-dark:#B392F0;">$if</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> user.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">isLogged</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(), </span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> () </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=></span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> Dashboard</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(), </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// Only executed if logged in</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> () </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=></span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> LoginGate</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">() </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// Only executed if guest</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span></code></pre></div><hr><h2 id="🧹-automatic-cleanup" tabindex="-1">🧹 Automatic Cleanup <a class="header-anchor" href="#🧹-automatic-cleanup" aria-label="Permalink to "🧹 Automatic Cleanup""></a></h2><p>One of the core strengths of <code>$if</code> is its integrated <strong>Cleanup</strong> logic. SigPro ensures that when a branch is swapped out, it is completely purged.</p><ol><li><strong>Stop Watchers</strong>: All <code>$.watch</code> calls inside the inactive branch are permanently stopped.</li><li><strong>Unbind Events</strong>: Event listeners attached via <code>$.html</code> are removed.</li><li><strong>Recursive Sweep</strong>: SigPro performs a deep "sweep" of the removed branch to ensure no nested reactive effects remain active.</li></ol><hr><h2 id="💡-best-practices" tabindex="-1">💡 Best Practices <a class="header-anchor" href="#💡-best-practices" aria-label="Permalink to "💡 Best Practices""></a></h2><ul><li><strong>Function Wrappers</strong>: If your branches are heavy (e.g., they contain complex components), wrap them in a function <code>() => MyComponent()</code>. This prevents the component from being initialized until the condition actually meets its requirement.</li><li><strong>Logical Expressions</strong>: You can pass a complex computed function as the condition:<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:#6F42C1;--shiki-dark:#B392F0;">$if</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=></span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> count</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">></span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 10</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> &&</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> status</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">===</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 'ready'</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span></span>
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<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> Span</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"Threshold reached!"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span></code></pre></div></li></ul><hr><h2 id="🏗️-technical-comparison" tabindex="-1">🏗️ Technical Comparison <a class="header-anchor" href="#🏗️-technical-comparison" aria-label="Permalink to "🏗️ Technical Comparison""></a></h2><table tabindex="0"><thead><tr><th style="text-align:left;">Feature</th><th style="text-align:left;">Standard CSS <code>hidden</code></th><th style="text-align:left;">SigPro <code>$if</code></th></tr></thead><tbody><tr><td style="text-align:left;"><strong>DOM Presence</strong></td><td style="text-align:left;">Always present</td><td style="text-align:left;">Only if active</td></tr><tr><td style="text-align:left;"><strong>Reactivity</strong></td><td style="text-align:left;">Still processing in background</td><td style="text-align:left;"><strong>Paused/Destroyed</strong></td></tr><tr><td style="text-align:left;"><strong>Memory usage</strong></td><td style="text-align:left;">Higher</td><td style="text-align:left;"><strong>Optimized</strong></td></tr><tr><td style="text-align:left;"><strong>Cleanup</strong></td><td style="text-align:left;">Manual</td><td style="text-align:left;"><strong>Automatic</strong></td></tr></tbody></table></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/api/watch.html" data-v-4f9813fa><!--[--><span class="desc" data-v-4f9813fa>Previous page</span><span class="title" data-v-4f9813fa>$watch</span><!--]--></a></div><div class="pager" data-v-4f9813fa><a class="VPLink link pager-link next" href="/sigpro/api/for.html" data-v-4f9813fa><!--[--><span class="desc" data-v-4f9813fa>Next page</span><span class="title" data-v-4f9813fa>$for</span><!--]--></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><!----><!--[--><!--]--></div></div>
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