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<h1 class="article-title" itemprop="name">Parse Parameters</h1>
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<a target="_blank" rel="noopener external nofollow noreferrer" href="https://github.com/harttle/liquidjs/edit/master/docs/source/tutorials/parse-parameters.md" class="article-edit-link" title="Improve this doc"><i class="icon-pencil"></i></a>
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<h2 id="Access-Raw-Parameters" class="article-heading"><a href="#Access-Raw-Parameters" class="headerlink" title="Access Raw Parameters"></a>Access Raw Parameters<a class="article-anchor" href="#Access-Raw-Parameters" aria-hidden="true"></a></h2><p>As covered in <a href="/tutorials/register-filters-tags.html">Register Filters/Tags</a>, tag parameters is available on <code>tagToken.args</code> as a raw string. For example:</p>
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<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token comment">// Usage: {% random foo bar coo %}</span>
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<span class="token comment">// Output: "foo", "bar" or "coo"</span>
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engine<span class="token punctuation">.</span><span class="token function">registerTag</span><span class="token punctuation">(</span><span class="token string">'random'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
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<span class="token function">parse</span><span class="token punctuation">(</span><span class="token parameter">tagToken</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// tagToken.args === "foo bar coo"</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>items <span class="token operator">=</span> tagToken<span class="token punctuation">.</span>args<span class="token punctuation">.</span><span class="token function">split</span><span class="token punctuation">(</span><span class="token string">' '</span><span class="token punctuation">)</span>
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<span class="token punctuation">}</span><span class="token punctuation">,</span>
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<span class="token function">render</span><span class="token punctuation">(</span><span class="token parameter">context<span class="token punctuation">,</span> emitter</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// get a random index</span>
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<span class="token keyword">const</span> index <span class="token operator">=</span> Math<span class="token punctuation">.</span><span class="token function">floor</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>items<span class="token punctuation">.</span>length <span class="token operator">*</span> Math<span class="token punctuation">.</span><span class="token function">random</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
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<span class="token comment">// output that item</span>
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emitter<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>items<span class="token punctuation">[</span>index<span class="token punctuation">]</span><span class="token punctuation">)</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><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></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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<p>Here’s a JSFiddle version: <a target="_blank" rel="noopener external nofollow noreferrer" href="https://jsfiddle.net/ctj364up/2/">https://jsfiddle.net/ctj364up/2/</a></p>
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<h2 id="Parse-Parameters-as-Values" class="article-heading"><a href="#Parse-Parameters-as-Values" class="headerlink" title="Parse Parameters as Values"></a>Parse Parameters as Values<a class="article-anchor" href="#Parse-Parameters-as-Values" aria-hidden="true"></a></h2><p>Sometimes we need more dynamic tags and want to pass values to the custom tag instead of static strings. Variables in LiquidJS can be literal (string, number, etc.) or a variable from current context scope.</p>
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<p>The following modified template also contains 3 values to random from, but they’re values instead of static strings. The first one is string literal, second one is an identifier, third one is a property access sequence containing two identifiers.</p>
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<pre class="line-numbers language-liquid" data-language="liquid"><code class="language-liquid"><span class="token liquid language-liquid"><span class="token delimiter punctuation">{%</span> random <span class="token string">"foo"</span> bar obj<span class="token punctuation">.</span>coo <span class="token delimiter punctuation">%}</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
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<p>It can be tricky to parse all these cases manually, but there’s a <a href="/api/classes/Tokenizer.html">Tokenizer</a> class in LiquidJS you can make use of.</p>
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<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token keyword">const</span> <span class="token punctuation">{</span> Liquid<span class="token punctuation">,</span> Tokenizer<span class="token punctuation">,</span> evalToken <span class="token punctuation">}</span> <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'liquidjs'</span><span class="token punctuation">)</span>
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engine<span class="token punctuation">.</span><span class="token function">registerTag</span><span class="token punctuation">(</span><span class="token string">'random'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
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<span class="token function">parse</span><span class="token punctuation">(</span><span class="token parameter">tagToken</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">const</span> tokenizer <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Tokenizer</span><span class="token punctuation">(</span>tagToken<span class="token punctuation">.</span>args<span class="token punctuation">)</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>items <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span>
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<span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token operator">!</span>tokenizer<span class="token punctuation">.</span><span class="token function">end</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 comment">// here readValue() returns a LiteralToken or PropertyAccessToken</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>items<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>tokenizer<span class="token punctuation">.</span><span class="token function">readValue</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>
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<span class="token punctuation">}</span><span class="token punctuation">,</span>
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<span class="token operator">*</span> <span class="token function">render</span><span class="token punctuation">(</span><span class="token parameter">context<span class="token punctuation">,</span> emitter</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">const</span> index <span class="token operator">=</span> Math<span class="token punctuation">.</span><span class="token function">floor</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>items<span class="token punctuation">.</span>length <span class="token operator">*</span> Math<span class="token punctuation">.</span><span class="token function">random</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
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<span class="token keyword">const</span> token <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>items<span class="token punctuation">[</span>index<span class="token punctuation">]</span>
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<span class="token comment">// in LiquidJS, we use yield to wait for async call</span>
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<span class="token keyword">const</span> value <span class="token operator">=</span> <span class="token keyword">yield</span> <span class="token function">evalToken</span><span class="token punctuation">(</span>token<span class="token punctuation">,</span> context<span class="token punctuation">)</span>
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emitter<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>value<span class="token punctuation">)</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><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></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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<p>Calling this tag in scope <code>{ bar: "bar", obj: { coo: "coo" } }</code> yields exactly the same result as the first example. See this JSFiddle: <a target="_blank" rel="noopener external nofollow noreferrer" href="https://jsfiddle.net/ctj364up/3/">https://jsfiddle.net/ctj364up/3/</a></p>
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<blockquote class="note info"><strong class="note-title">Async and Promises</strong><p>Async calls in LiquidJS are implemented by generators directly, for we can call generators in synchronous manner so this tag implementation is also valid for <code>renderSync()</code>, <code>parseAndRenderSync()</code>, <code>renderFileSync()</code>. If you need to await a promise in tag implementation, simply replace <code>await somePromise</code> with <code>yield somePromise</code> and keep <code>* render()</code> instead of <code>async render()</code> will do the trick. See <a href="/tutorials/sync-and-async.html">Sync and Async</a> for more details.</p>
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</blockquote>
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<h2 id="Parse-Key-Value-Pairs-as-Named-Parameters" class="article-heading"><a href="#Parse-Key-Value-Pairs-as-Named-Parameters" class="headerlink" title="Parse Key-Value Pairs as Named Parameters"></a>Parse Key-Value Pairs as Named Parameters<a class="article-anchor" href="#Parse-Key-Value-Pairs-as-Named-Parameters" aria-hidden="true"></a></h2><p>Named parameters become very handy when there’re optional parameters or lots of parameters, in which case the order of parameters is not important. This is exactly what <a href="/api/classes/Hash.html">Hash</a> class is invented for.</p>
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<pre class="line-numbers language-liquid" data-language="liquid"><code class="language-liquid"><span class="token liquid language-liquid"><span class="token delimiter punctuation">{%</span> random from<span class="token operator">:</span><span class="token number">2</span><span class="token punctuation">,</span> to<span class="token operator">:</span>max <span class="token delimiter punctuation">%}</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
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<p>In the above example, we’re trying to generate a random number in the range [2, max]. We’ll use <code>Hash</code> to parse <code>from</code> and <code>to</code> parameters.</p>
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<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token keyword">const</span> <span class="token punctuation">{</span> Liquid<span class="token punctuation">,</span> Hash <span class="token punctuation">}</span> <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'liquidjs'</span><span class="token punctuation">)</span>
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engine<span class="token punctuation">.</span><span class="token function">registerTag</span><span class="token punctuation">(</span><span class="token string">'random'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
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<span class="token function">parse</span><span class="token punctuation">(</span><span class="token parameter">tagToken</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// parse the parameters structure into `this.args`</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>args <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Hash</span><span class="token punctuation">(</span>tagToken<span class="token punctuation">.</span>args<span class="token punctuation">)</span>
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<span class="token punctuation">}</span><span class="token punctuation">,</span>
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<span class="token operator">*</span> <span class="token function">render</span><span class="token punctuation">(</span><span class="token parameter">context<span class="token punctuation">,</span> emitter</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// evaluate the parameters in `context`</span>
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<span class="token keyword">const</span> <span class="token punctuation">{</span>from<span class="token punctuation">,</span> to<span class="token punctuation">}</span> <span class="token operator">=</span> <span class="token keyword">yield</span> <span class="token keyword">this</span><span class="token punctuation">.</span>args<span class="token punctuation">.</span><span class="token function">render</span><span class="token punctuation">(</span>context<span class="token punctuation">)</span>
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<span class="token keyword">const</span> length <span class="token operator">=</span> to <span class="token operator">-</span> from <span class="token operator">+</span> <span class="token number">1</span>
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<span class="token keyword">const</span> value <span class="token operator">=</span> from <span class="token operator">+</span> Math<span class="token punctuation">.</span><span class="token function">floor</span><span class="token punctuation">(</span>length <span class="token operator">*</span> Math<span class="token punctuation">.</span><span class="token function">random</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
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emitter<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>value<span class="token punctuation">)</span>
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||
<span class="token punctuation">}</span>
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||
<span class="token punctuation">}</span><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></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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<p>Rendering <code>{% random from:2, to:max %}</code> in scope <code>{ max: 10 }</code> will generate a random number in the range [2, 10]. See this JSFiddle: <a target="_blank" rel="noopener external nofollow noreferrer" href="https://jsfiddle.net/ctj364up/4/">https://jsfiddle.net/ctj364up/4/</a></p>
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<time class="article-footer-updated" datetime="2024-12-01T01:55:02.466Z" itemprop="dateModified">Last updated: 2024-12-01</time>
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<a href="access-scope-in-filters.html" class="article-footer-prev" title="Access Scope in Filters"><i class="icon-chevron-left"></i><span>Prev</span></a><a href="render-tag-content.html" class="article-footer-next" title="Render Tag Content"><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="#Access-Raw-Parameters"><span class="toc-text">Access Raw Parameters</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Parse-Parameters-as-Values"><span class="toc-text">Parse Parameters as Values</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Parse-Key-Value-Pairs-as-Named-Parameters"><span class="toc-text">Parse Key-Value Pairs as Named Parameters</span></a></li></ol>
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