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HTML
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HTML
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<title>Plugins | LiquidJS</title>
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<a target="_blank" rel="noopener external nofollow noreferrer" href="https://github.com/harttle/liquidjs" class="main-nav-link icon-nav-link"><i class="icon-github"></i> <span class="icon-nav-title">Github</span></a>
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<strong class="sidebar-title">Getting Started</strong><a href="intro-to-liquid.html" class="sidebar-link">Intro to Liquid</a><a href="setup.html" class="sidebar-link">Setup</a><a href="options.html" class="sidebar-link">Options</a><a href="render-file.html" class="sidebar-link">Render Files</a><a href="partials-and-layouts.html" class="sidebar-link">Includes and Layouts</a><a href="use-in-expressjs.html" class="sidebar-link">Use in Express.js</a><strong class="sidebar-title">Advanced</strong><a href="caching.html" class="sidebar-link">Caching</a><a href="register-filters-tags.html" class="sidebar-link">Register Filters/Tags</a><a href="access-scope-in-filters.html" class="sidebar-link">Access Scope in Filters</a><a href="parse-parameters.html" class="sidebar-link">Parse Parameters</a><a href="render-tag-content.html" class="sidebar-link">Render Tag Content</a><a href="sync-and-async.html" class="sidebar-link">Sync and Async</a><a href="whitespace-control.html" class="sidebar-link">Whitespace Control</a><a href="plugins.html" class="sidebar-link current">Plugins</a><a href="operators.html" class="sidebar-link">Operators</a><a href="truthy-and-falsy.html" class="sidebar-link">Truthy and Falsy</a><strong class="sidebar-title">Miscellaneous</strong><a href="migrate-to-9.html" class="sidebar-link">Migrate to LiquidJS 9</a><a href="changelog.html" class="sidebar-link">Changelog</a><a href="differences.html" class="sidebar-link">Differences with Shopify/liquid</a><a href="contribution-guidelines.html" class="sidebar-link">Contribution Guidelines</a>
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<div class="article">
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<div class="inner">
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<header class="article-header">
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<h1 class="article-title" itemprop="name">Plugins</h1>
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<a target="_blank" rel="noopener external nofollow noreferrer" href="https://github.com/harttle/liquidjs/edit/master/docs/source/tutorials/plugins.md" class="article-edit-link" title="Improve this doc"><i class="icon-pencil"></i></a>
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</header>
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<div class="article-content" itemprop="articleBody">
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<p>A number of tags and filters can be encapsulated into a <strong>plugin</strong>, which will be typically installed via npm. This article provides information about how to create and use a plugin.</p>
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<h2 id="Write-a-Plugin" class="article-heading"><a href="#Write-a-Plugin" class="headerlink" title="Write a Plugin"></a>Write a Plugin<a class="article-anchor" href="#Write-a-Plugin" aria-hidden="true"></a></h2><p>A liquidjs plugin is simple function which takes the <a href="../api/classes/liquid_.liquid.html">Liquid class</a> as the first parameter and the Liquid instance for <code>this</code>. We can call liquidjs APIs on <code>this</code> to make certain changes, especially <a href="/harttle/liquidjs/wiki/Register-Filters-Tags">register filters and tags</a>.</p>
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<p>Now we’ll make a plugin to upper case every letter of the input, save the following snippet to <code>upup.js</code>:</p>
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<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token comment">/**
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* Inside the plugin function, `this` refers to the Liquid instance.
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*
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* @param Liquid: provides facilities to implement tags and filters.
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*/</span>
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module<span class="token punctuation">.</span><span class="token function-variable function">exports</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">Liquid</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">registerFilter</span><span class="token punctuation">(</span><span class="token string">'upup'</span><span class="token punctuation">,</span> <span class="token parameter">x</span> <span class="token operator">=></span> x<span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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<h2 id="Use-a-Plugin" class="article-heading"><a href="#Use-a-Plugin" class="headerlink" title="Use a Plugin"></a>Use a Plugin<a class="article-anchor" href="#Use-a-Plugin" aria-hidden="true"></a></h2><p>Simply pass the plugin function into the <code>.plugin()</code> method:</p>
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<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token keyword">const</span> engine <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Liquid</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
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engine<span class="token punctuation">.</span><span class="token function">plugin</span><span class="token punctuation">(</span><span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'./upup.js'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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engine
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<span class="token punctuation">.</span><span class="token function">parseAndRender</span><span class="token punctuation">(</span><span class="token string">'{{ "foo" | upup }}'</span><span class="token punctuation">)</span>
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<span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span>console<span class="token punctuation">.</span>log<span class="token punctuation">)</span> <span class="token comment">// outputs "FOO"</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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<h2 id="Plugin-List" class="article-heading"><a href="#Plugin-List" class="headerlink" title="Plugin List"></a>Plugin List<a class="article-anchor" href="#Plugin-List" aria-hidden="true"></a></h2><p>Since this library excludes certain features that are available on the Shopify platform but not on the <a target="_blank" rel="noopener external nofollow noreferrer" href="https://github.com/Shopify/liquid/">Shopify/liquid</a> repo, see <a target="_blank" rel="noopener external nofollow noreferrer" href="https://github.com/harttle/liquidjs#differences-and-limitations">https://github.com/harttle/liquidjs#differences-and-limitations</a>.</p>
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<p>Here’s a list of plugins that backfill those features. Feel free to add yours, this file is publicly editable.</p>
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<ul>
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<li>Sections Tags (WIP): <a target="_blank" rel="noopener external nofollow noreferrer" href="https://github.com/harttle/liquidjs-section-tags">https://github.com/harttle/liquidjs-section-tags</a></li>
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<li>Color Filters: <a target="_blank" rel="noopener external nofollow noreferrer" href="https://github.com/harttle/liquidjs-color-filters">https://github.com/harttle/liquidjs-color-filters</a></li>
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</ul>
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</div>
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<footer class="article-footer">
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<time class="article-footer-updated" datetime="2022-10-17T19:06:28.671Z" itemprop="dateModified">Last updated: 2022-10-17</time>
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<a href="whitespace-control.html" class="article-footer-prev" title="Whitespace Control"><i class="icon-chevron-left"></i><span>Prev</span></a><a href="operators.html" class="article-footer-next" title="Operators"><span>Next</span><i class="icon-chevron-right"></i></a>
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<strong class="sidebar-title">Contents</strong>
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<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#Write-a-Plugin"><span class="toc-text">Write a Plugin</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Use-a-Plugin"><span class="toc-text">Use a Plugin</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Plugin-List"><span class="toc-text">Plugin List</span></a></li></ol>
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© 2022 <a href="https://github.com/harttle/liquidjs/graphs/contributors" rel="external nofollow noreferrer" target="_blank">Harttle</a><br>
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Documentation licensed under <a href="http://creativecommons.org/licenses/by/4.0/" rel="external nofollow noreferrer" target="_blank">CC BY 4.0</a>.
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<strong class="mobile-nav-title">Getting Started</strong><a href="intro-to-liquid.html" class="mobile-nav-link">Intro to Liquid</a><a href="setup.html" class="mobile-nav-link">Setup</a><a href="options.html" class="mobile-nav-link">Options</a><a href="render-file.html" class="mobile-nav-link">Render Files</a><a href="partials-and-layouts.html" class="mobile-nav-link">Includes and Layouts</a><a href="use-in-expressjs.html" class="mobile-nav-link">Use in Express.js</a><strong class="mobile-nav-title">Advanced</strong><a href="caching.html" class="mobile-nav-link">Caching</a><a href="register-filters-tags.html" class="mobile-nav-link">Register Filters/Tags</a><a href="access-scope-in-filters.html" class="mobile-nav-link">Access Scope in Filters</a><a href="parse-parameters.html" class="mobile-nav-link">Parse Parameters</a><a href="render-tag-content.html" class="mobile-nav-link">Render Tag Content</a><a href="sync-and-async.html" class="mobile-nav-link">Sync and Async</a><a href="whitespace-control.html" class="mobile-nav-link">Whitespace Control</a><a href="plugins.html" class="mobile-nav-link current">Plugins</a><a href="operators.html" class="mobile-nav-link">Operators</a><a href="truthy-and-falsy.html" class="mobile-nav-link">Truthy and Falsy</a><strong class="mobile-nav-title">Miscellaneous</strong><a href="migrate-to-9.html" class="mobile-nav-link">Migrate to LiquidJS 9</a><a href="changelog.html" class="mobile-nav-link">Changelog</a><a href="differences.html" class="mobile-nav-link">Differences with Shopify/liquid</a><a href="contribution-guidelines.html" class="mobile-nav-link">Contribution Guidelines</a>
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