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<!DOCTYPE html>
<html lang="en"><head>
<link rel="icon" href="/logo.svg">
<title>VanGraph - Visualize Dependencies in Your App</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
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<link rel="stylesheet" href="/code/w3-v1.css">
<link rel="stylesheet" href="/code/prism-v1.css">
<link rel="stylesheet" href="/vanjs.css">
</head>
<body class="line-numbers" data-prismjs-copy="📋">
<!-- Gurubase Widget -->
<script async src="https://widget.gurubase.io/widget.latest.min.js" id="guru-widget-id" data-widget-id="f0WMAZ_-X7VX2FTx6oGbm_FvuhgEyJTZKjTrEqCDlQ0" data-text="Ask AI" data-bg-color="rgba(244, 67, 54, 0.3)" data-light-mode="true">
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gtag('js', new Date());
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<script type="text/javascript" src="/code/prism-v1.js" defer></script>
<!-- Sidebar/menu -->
<nav class="w3-sidebar w3-red w3-collapse w3-top w3-large w3-padding" style="z-index:3;width:280px;font-weight:bold;" id="mySidebar"><br>
<a href="javascript:void(0)" onclick="w3_close()" class="w3-button w3-hide-large w3-display-topleft" style="width:100%;font-size:22px">Close Menu</a>
<div class="w3-container">
<h1 class="w3-padding-16 w3-xxxlarge">
<img src="/logo.svg" alt="VanJS" width="192px" height="192px">
</h1>
</div>
<div id="nav" class="w3-bar-block"><a href="/" onclick="w3_close()" class="w3-bar-item w3-button w3-hover-white">Home</a><a href="/start" onclick="w3_close()" class="w3-bar-item w3-button w3-hover-white">Getting Started</a><a href="/tutorial" onclick="w3_close()" class="w3-bar-item w3-button w3-hover-white">Tutorial</a><a href="/demo" onclick="w3_close()" class="w3-bar-item w3-button w3-hover-white">VanJS by Example</a><a href="/convert" onclick="w3_close()" class="w3-bar-item w3-button w3-hover-white">HTML/MD to VanJS</a><a href="/vanui" onclick="w3_close()" class="w3-bar-item w3-button w3-hover-white">VanUI</a><a href="/minivan" onclick="w3_close()" class="w3-bar-item w3-button w3-hover-white">Mini-Van</a><a href="/ssr" onclick="w3_close()" class="w3-bar-item w3-button w3-hover-white">SSR & Hydration</a><a href="/x" onclick="w3_close()" class="w3-bar-item w3-button w3-hover-white">X</a><a href="/advanced" onclick="w3_close()" class="w3-bar-item w3-button w3-hover-white">Advanced Topics</a><a href="/media" onclick="w3_close()" class="w3-bar-item w3-button w3-hover-white">Media Coverage</a><a href="/about" onclick="w3_close()" class="w3-bar-item w3-button w3-hover-white">About</a></div>
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<header class="w3-container w3-top w3-hide-large w3-red w3-xlarge w3-padding">
<a href="javascript:void(0)" class="w3-button w3-red w3-margin-right" onclick="w3_open()">☰</a>
<span id="title-bar"></span>
</header>
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<div class="w3-overlay w3-hide-large" onclick="w3_close()" style="cursor:pointer" title="close side menu" id="myOverlay"></div>
<!-- !PAGE CONTENT! -->
<div class="w3-main" style="margin-left:300px;">
<div id="page">
<div id="content"><h1 class="w3-xxlarge"><strong>VanGraph</strong>: Visualize Dependencies in Your App</h1><p><strong>VanGraph</strong> is a library that helps you visualize dependency graph among states and DOM nodes with the help of <a href="https://graphviz.org/" class="w3-hover-opacity">Graphviz</a>. Here is the sample usage:</p><pre><code class="language-js">const firstName = van.state("Tao"), lastName = van.state("Xin")
const fullName = van.derive(() => `${firstName.val} ${lastName.val}`)
// Build the DOM tree...
// To visualize the dependency graph among `firstName`, `lastName`, `fullName`, and all the
// derived states and DOM nodes from them.
vanGraph.show({firstName, lastName, fullName})
</code></pre><p>Checkout a demo in <a href="https://codesandbox.io/p/devbox/github/vanjs-org/van/tree/main/graph/examples/basic?file=%2Fsrc%2Fmain.ts" class="w3-hover-opacity">CodeSandbox</a>.</p><h2 class="w3-xxlarge w3-text-red" id="installation"><a class="self-link" href="#installation">Installation</a></h2><hr style="width:50px;border:5px solid red" class="w3-round"><h3 class="w3-large w3-text-red" id="via-npm"><a class="self-link" href="#via-npm">Via NPM</a></h3><p>The library is published as NPM package <a href="https://www.npmjs.com/package/vanjs-graph" class="w3-hover-opacity">vanjs-graph</a>. Run the following command to install the package:</p><pre><code class="language-shell">npm install vanjs-graph
</code></pre><p>To use the NPM package, add this line to your script:</p><pre><code class="language-js">import * as vanGraph from "vanjs-graph"
</code></pre><h3 class="w3-large w3-text-red" id="via-a-script-tag"><a class="self-link" href="#via-a-script-tag">Via a Script Tag</a></h3><p>Alternatively, you can import <strong>VanGraph</strong> from CDN via a <code class="symbol"><script type="text/javascript"></code> tag:</p><pre><code class="language-html"><script type="text/javascript" src="https://cdn.jsdelivr.net/npm/[email protected]/dist/van-graph.nomodule.min.js"></script>
</code></pre><p><code class="symbol">https://cdn.jsdelivr.net/npm/[email protected]/dist/van-graph.nomodule.js</code> can be used for the non-minified version.</p><p>Note that: you need to import <strong>VanJS</strong> and <code class="symbol">@viz-js/viz</code> before <strong>VanGraph</strong> for it to be used properly:</p><pre><code class="language-html"><script type="text/javascript" src="https://cdn.jsdelivr.net/gh/vanjs-org/van/public/van-1.5.3.nomodule.min.js"></script>
<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/@viz-js/[email protected]/lib/viz-standalone.js"></script>
</code></pre><p><a href="https://jsfiddle.net/zo49cqys/1/" class="w3-hover-opacity">Try on jsfiddle</a></p><h2 class="w3-xxlarge w3-text-red" id="documentation"><a class="self-link" href="#documentation">Documentation</a></h2><hr style="width:50px;border:5px solid red" class="w3-round"><pre><code class="language-js">vanGraph.show(states[, options]) => Promise<SVGSVGElement>
</code></pre><p>The parameter <code class="symbol">states</code> represents a collection of <code class="symbol">State</code> objects whose dependency graph we want to visualize. All the <code class="symbol">State</code> objects and their dependents will be rendered in the dependency graph. <code class="symbol">states</code> can either be specified as a plain object, e.g.: <code class="symbol">{firstName, lastName, fullName}</code>, or as an array, e.g.: <code class="symbol">[firstName, lastName, fullName]</code>. If <code class="symbol">states</code> is specified as an array, the variable names won't be shown in the rendered graph.</p><p><code class="symbol">options</code> is a plain object with the following properties:</p><ul><li><code class="symbol">rankdir</code>: Type <code class="symbol">string</code>. Default <code class="symbol">"LR"</code>. Optional. Corresponding to the graph attribute <code class="symbol">rankdir</code> in Graphviz.</li></ul><p>The function returns a <code class="symbol">Promise<SVGSVGElement></code> so that you can await the result and then attach <code class="symbol">SVGSVGElement</code> to the main DOM tree.</p></div>
<aside id="toc"><ul><li><a href="#installation" class="w3-hover-opacity">Installation</a><ul><li><a href="#via-npm" class="w3-hover-opacity">Via NPM</a></li><li><a href="#via-a-script-tag" class="w3-hover-opacity">Via a Script Tag</a></li></ul></li><li><a href="#documentation" class="w3-hover-opacity">Documentation</a></li></ul></aside>
</div>
</div>
<script>
// Script to open and close sidebar
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document.getElementById("mySidebar").style.display = "block"
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const file = e.previousElementSibling.innerText
const importLine = file.includes("nomodule") ?
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