gojs
Version:
Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
465 lines (464 loc) • 25.3 kB
HTML
<html class="default no-js">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>PanelLayout | GoJS API</title>
<meta name="description" content="Documentation for GoJS API">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="../assets/css/main.css">
<link rel="stylesheet" href="../../assets/css/style.css">
<script async src="../assets/js/search.js" id="search-script"></script>
</head>
<body>
<header>
<nav id="navTop" class="w-full z-30 top-0 text-white bg-nwoods-primary">
<div class="w-full container max-w-screen-lg mx-auto flex flex-wrap sm:flex-nowrap items-center justify-between mt-0 py-2">
<div class="md:pl-4">
<a class="text-white hover:text-white no-underline hover:no-underline
font-bold text-2xl lg:text-4xl rounded-lg hover:bg-nwoods-secondary" href="../">
<h1 class="mb-0 p-1">GoJS</h1>
</a>
</div>
<button id="topnavButton" class="rounded-lg sm:hidden focus:outline-none focus:ring" aria-label="Navigation">
<svg fill="currentColor" viewBox="0 0 20 20" class="w-6 h-6">
<path id="topnavOpen" fill-rule="evenodd" d="M3 5a1 1 0 011-1h12a1 1 0 110 2H4a1 1 0 01-1-1zM3 10a1 1 0 011-1h12a1 1 0 110 2H4a1 1 0 01-1-1zM9 15a1 1 0 011-1h6a1 1 0 110 2h-6a1 1 0 01-1-1z" clip-rule="evenodd"></path>
<path id="topnavClosed" class="hidden" fill-rule="evenodd" d="M4.293 4.293a1 1 0 011.414 0L10 8.586l4.293-4.293a1 1 0 111.414 1.414L11.414 10l4.293 4.293a1 1 0 01-1.414 1.414L10 11.414l-4.293 4.293a1 1 0 01-1.414-1.414L8.586 10 4.293 5.707a1 1 0 010-1.414z" clip-rule="evenodd"></path>
</svg>
</button>
<div id="topnavList" class="hidden sm:block items-center w-auto mt-0 text-white p-0 z-20">
<ul class="list-reset list-none flex justify-end flex-wrap sm:flex-nowrap items-center px-0 pb-0">
<li class="p-1 sm:p-0"><a class="topnav-link" href="../learn/">Learn</a></li>
<li class="p-1 sm:p-0"><a class="topnav-link" href="../samples/">Samples</a></li>
<li class="p-1 sm:p-0"><a class="topnav-link" href="../intro/">Intro</a></li>
<li class="p-1 sm:p-0"><a class="topnav-link" href="../api/">API</a></li>
<li class="p-1 sm:p-0"><a class="topnav-link" href="https://www.nwoods.com/products/register.html">Register</a></li>
<li class="p-1 sm:p-0"><a class="topnav-link" href="../download.html">Download</a></li>
<li class="p-1 sm:p-0"><a class="topnav-link" href="https://forum.nwoods.com/c/gojs/11">Forum</a></li>
<li class="p-1 sm:p-0"><a class="topnav-link" href="https://www.nwoods.com/contact.html">Contact</a></li>
<li class="p-1 sm:p-0"><a class="topnav-link" href="https://www.nwoods.com/sales/index.html">Buy</a></li>
</ul>
</div>
</div>
<hr class="border-b border-gray-600 opacity-50 my-0 py-0" />
</nav>
<div class="tsd-page-header">
<div class="tsd-page-toolbar">
<div class="container plr15">
<div class="table-wrap">
<div class="table-cell" id="tsd-search" data-index="../assets/js/search.json" data-base="..">
<div class="field">
<label for="tsd-search-field" class="tsd-widget search no-caption">Search</label>
<input id="tsd-search-field" type="text" />
</div>
<ul class="results">
<li class="state loading">Preparing search index...</li>
<li class="state failure">The search index is not available</li>
</ul>
<a href="../index.html" class="title">GoJS API</a>
</div>
<div class="table-cell" id="tsd-widgets">
<div id="tsd-filter">
<a href="#" class="tsd-widget options no-caption" data-toggle="options">Options</a>
<div class="tsd-filter-group">
<div class="tsd-select" id="tsd-filter-visibility">
<span class="tsd-select-label">All</span>
<ul class="tsd-select-list">
<li data-value="public">Public</li>
<li data-value="protected">Public/Protected</li>
<li data-value="private" class="selected">All</li>
</ul>
</div>
</div>
</div>
<a href="#" class="tsd-widget menu no-caption" data-toggle="menu">Menu</a>
</div>
</div>
</div>
</div>
<div class="tsd-page-title">
<div class="container plr15">
<div class="top-copyright">
<b>GoJS</b>® Diagramming Components<br/>version 2.1.39<br/>by <a href="https://www.nwoods.com/">Northwoods Software®</a>
</div>
<div>
<h1>Class PanelLayout</h1>
</div>
</div>
</div>
</div>
</header>
<div class="container container-main plr-15">
<div class="row">
<div class="col-8 col-content">
<section class="tsd-panel tsd-hierarchy">
<h3>Hierarchy</h3>
<ul class="tsd-hierarchy">
<li>
<span class="target">PanelLayout</span>
</li>
</ul>
</section>
<section class="tsd-panel tsd-comment">
<div class="tsd-comment tsd-typography">
<p>This is the abstract base class for all Panel Layouts, which inform the possible Panel types.
It is possible to create your own Panel type by creating a subclass of PanelLayout,
though this is not common and not recommended for beginners.</p>
<p>By default, GoJS has 12 panel types, each corresponding to a PanelLayout subclass:</p>
<ul>
<li><code>'Position', PanelLayoutPosition</code></li>
<li><code>'Horizontal', PanelLayoutHorizontal</code></li>
<li><code>'Vertical', PanelLayoutVertical</code></li>
<li><code>'Spot', PanelLayoutSpot</code></li>
<li><code>'Auto', PanelLayoutAuto</code></li>
<li><code>'Table', PanelLayoutTable</code></li>
<li><code>'Viewbox', PanelLayoutViewbox</code></li>
<li><code>'TableRow', PanelLayoutTableRow</code></li>
<li><code>'TableColumn', PanelLayoutTableColumn</code></li>
<li><code>'Link', PanelLayoutLink</code></li>
<li><code>'Grid', PanelLayoutGrid</code></li>
<li><code>'Graduated', PanelLayoutGraduated</code></li>
</ul>
<p>These are included by default in builds of <code>go.js</code> and <code>go-debug.js</code>.
When building from source, you can optionally exclude all of them except <code>Position</code>,
<code>Vertical</code>, <code>Auto</code>, <code>Link</code>, and <code>Grid</code>.
This is demonstrated in <code>minimalSource</code> and <code>maximalSource</code>, in the <code>/projects</code> folder.</p>
<p>Adding a new Layout is done by calling the static function, <a href="Panel.html#static-definePanelLayout">Panel.definePanelLayout</a>:</p>
<pre><code class="language-js"><span style="color: #9CDCFE">Panel</span><span style="color: #D4D4D4">.</span><span style="color: #DCDCAA">definePanelLayout</span><span style="color: #D4D4D4">(</span><span style="color: #CE9178">'Table'</span><span style="color: #D4D4D4">, </span><span style="color: #569CD6">new</span><span style="color: #D4D4D4"> </span><span style="color: #DCDCAA">PanelLayoutTable</span><span style="color: #D4D4D4">());</span>
</code></pre>
<p>Each PanelLayout defines a <a href="PanelLayout.html#measure">measure</a> and <a href="PanelLayout.html#arrange">arrange</a> routine.
The measure routine must call <a href="PanelLayout.html#measureElement">measureElement</a> with each element of the Panel,
and the arrange routine must similarly call <a href="PanelLayout.html#arrangeElement">arrangeElement</a> with each element of the Panel.</p>
<p>There is an example PanelLayout in the <a href="../../samples/panelLayout.html">PanelLayout sample</a>.</p>
<dl class="tsd-comment-tags">
<dt>since</dt>
<dd><p>2.0</p>
</dd>
</dl>
</div>
</section>
<section class="tsd-panel-group tsd-index-group">
<h2>Index</h2>
<section class="tsd-panel tsd-index-panel">
<div class="tsd-index-content">
<section class="tsd-index-section ">
<h3>Constructors</h3>
<ul class="tsd-index-list">
<li class="tsd-kind-constructor tsd-parent-kind-class"><a href="PanelLayout.html#constructor" class="tsd-kind-icon">constructor</a></li>
</ul>
</section>
<section class="tsd-index-section ">
<h3>Methods</h3>
<ul class="tsd-index-list">
<li class="tsd-kind-method tsd-parent-kind-class"><a href="PanelLayout.html#arrange" class="tsd-kind-icon">arrange</a></li>
<li class="tsd-kind-method tsd-parent-kind-class tsd-is-protected"><a href="PanelLayout.html#arrangeElement" class="tsd-kind-icon">arrange<wbr>Element</a></li>
<li class="tsd-kind-method tsd-parent-kind-class"><a href="PanelLayout.html#measure" class="tsd-kind-icon">measure</a></li>
<li class="tsd-kind-method tsd-parent-kind-class tsd-is-protected"><a href="PanelLayout.html#measureElement" class="tsd-kind-icon">measure<wbr>Element</a></li>
</ul>
</section>
</div>
</section>
</section>
<section class="tsd-panel-group tsd-member-group ">
<h2>Constructors</h2>
<section class="tsd-panel tsd-member tsd-kind-constructor tsd-parent-kind-class">
<a name="constructor" class="tsd-anchor"></a>
<h3>
constructor
</h3>
<ul class="tsd-signatures tsd-kind-constructor tsd-parent-kind-class">
<li class="tsd-signature tsd-kind-icon">new <wbr>Panel<wbr>Layout<span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><a href="PanelLayout.html" class="tsd-signature-type" data-tsd-kind="Class">PanelLayout</a></li>
</ul>
<ul class="tsd-descriptions">
<li class="tsd-description">
<h4 class="tsd-returns-title">Returns <a href="PanelLayout.html" class="tsd-signature-type" data-tsd-kind="Class">PanelLayout</a></h4>
</li>
</ul>
</section>
</section>
<section class="tsd-panel-group tsd-member-group ">
<h2>Methods</h2>
<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-class">
<a name="arrange" class="tsd-anchor"></a>
<h3>
<span class="tsd-flag ts-flagVirtual">Virtual</span>
arrange
</h3>
<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-class">
<li class="tsd-signature tsd-kind-icon">arrange<span class="tsd-signature-symbol">(</span>panel<span class="tsd-signature-symbol">: </span><a href="Panel.html" class="tsd-signature-type" data-tsd-kind="Class">Panel</a>, elements<span class="tsd-signature-symbol">: </span><a href="GraphObject.html" class="tsd-signature-type" data-tsd-kind="Class">GraphObject</a><span class="tsd-signature-symbol">[]</span>, union<span class="tsd-signature-symbol">: </span><a href="Rect.html" class="tsd-signature-type" data-tsd-kind="Class">Rect</a><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">void</span></li>
</ul>
<ul class="tsd-descriptions">
<li class="tsd-description">
<div class="tsd-comment tsd-typography">
<p>Given the panel and its list of elements, arrange each element.</p>
<p>This must call <a href="PanelLayout.html#arrangeElement">arrangeElement</a> with each Panel element, which will set that element's <a href="GraphObject.html#actualBounds">GraphObject.actualBounds</a>.</p>
<p>For arranging some elements, it is useful to know the total unioned area of every element.
This Rect can be used to right-align or center-align, etc, elements within an area.</p>
</div>
<h4 class="tsd-parameters-title">Parameters</h4>
<ul class="tsd-parameters">
<li>
<h5>panel: <a href="Panel.html" class="tsd-signature-type" data-tsd-kind="Class">Panel</a></h5>
<div class="tsd-comment tsd-typography">
<p>Panel which called this layout</p>
</div>
</li>
<li>
<h5>elements: <a href="GraphObject.html" class="tsd-signature-type" data-tsd-kind="Class">GraphObject</a><span class="tsd-signature-symbol">[]</span></h5>
<div class="tsd-comment tsd-typography">
<p>Array of Panel elements</p>
</div>
</li>
<li>
<h5>union: <a href="Rect.html" class="tsd-signature-type" data-tsd-kind="Class">Rect</a></h5>
<div class="tsd-comment tsd-typography">
<p>rectangle, if properly constructed in <a href="PanelLayout.html#measure">measure</a>, that contains the expected union bounds of every element in the Panel.</p>
</div>
</li>
</ul>
<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4>
</li>
</ul>
</section>
<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-class tsd-is-protected">
<a name="arrangeElement" class="tsd-anchor"></a>
<h3>
<span class="tsd-flag ts-flagProtected">Protected</span>
arrange<wbr>Element
</h3>
<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-class tsd-is-protected">
<li class="tsd-signature tsd-kind-icon">arrange<wbr>Element<span class="tsd-signature-symbol">(</span>obj<span class="tsd-signature-symbol">: </span><a href="GraphObject.html" class="tsd-signature-type" data-tsd-kind="Class">GraphObject</a>, fx<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span>, fy<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span>, fw<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span>, fh<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span>, clipRect<span class="tsd-signature-symbol">?: </span><a href="Rect.html" class="tsd-signature-type" data-tsd-kind="Class">Rect</a><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">void</span></li>
</ul>
<ul class="tsd-descriptions">
<li class="tsd-description">
<div class="tsd-comment tsd-typography">
<p>Arranges the GraphObject onto its parent Panel.
The passed-in numbers typically account for <a href="GraphObject.html#margin">GraphObject.margin</a> and other offsets.
This sets <a href="GraphObject.html#actualBounds">GraphObject.actualBounds</a>.</p>
</div>
<h4 class="tsd-parameters-title">Parameters</h4>
<ul class="tsd-parameters">
<li>
<h5>obj: <a href="GraphObject.html" class="tsd-signature-type" data-tsd-kind="Class">GraphObject</a></h5>
<div class="tsd-comment tsd-typography">
<p>GraphObject to be arranged.</p>
</div>
</li>
<li>
<h5>fx: <span class="tsd-signature-type">number</span></h5>
<div class="tsd-comment tsd-typography">
<p>The final x value of actualBounds that the Panel computes for the GraphObject.</p>
</div>
</li>
<li>
<h5>fy: <span class="tsd-signature-type">number</span></h5>
<div class="tsd-comment tsd-typography">
<p>The final y value of actualBounds that the Panel computes for the GraphObject.</p>
</div>
</li>
<li>
<h5>fw: <span class="tsd-signature-type">number</span></h5>
<div class="tsd-comment tsd-typography">
<p>The final width value of actualBounds that the Panel computes for the GraphObject.</p>
</div>
</li>
<li>
<h5>fh: <span class="tsd-signature-type">number</span></h5>
<div class="tsd-comment tsd-typography">
<p>The final height value of actualBounds that the Panel computes for the GraphObject.</p>
</div>
</li>
<li>
<h5><span class="tsd-flag ts-flagOptional">Optional</span> clipRect: <a href="Rect.html" class="tsd-signature-type" data-tsd-kind="Class">Rect</a></h5>
<div class="tsd-comment tsd-typography">
<p>an optional area to constrain this actualBounds to when picking and drawing.
By default, this is only used with Fixed/Table panels element, provided as a Rect.</p>
</div>
</li>
</ul>
<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4>
</li>
</ul>
</section>
<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-class">
<a name="measure" class="tsd-anchor"></a>
<h3>
<span class="tsd-flag ts-flagVirtual">Virtual</span>
measure
</h3>
<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-class">
<li class="tsd-signature tsd-kind-icon">measure<span class="tsd-signature-symbol">(</span>panel<span class="tsd-signature-symbol">: </span><a href="Panel.html" class="tsd-signature-type" data-tsd-kind="Class">Panel</a>, width<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span>, height<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span>, elements<span class="tsd-signature-symbol">: </span><a href="GraphObject.html" class="tsd-signature-type" data-tsd-kind="Class">GraphObject</a><span class="tsd-signature-symbol">[]</span>, union<span class="tsd-signature-symbol">: </span><a href="Rect.html" class="tsd-signature-type" data-tsd-kind="Class">Rect</a>, minw<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span>, minh<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">void</span></li>
</ul>
<ul class="tsd-descriptions">
<li class="tsd-description">
<div class="tsd-comment tsd-typography">
<p>Given the available size, measure the Panel and
determine its expected drawing size. Sets the measuredBounds of the object.</p>
<p>This must call <a href="PanelLayout.html#measureElement">measureElement</a> with each Panel element.</p>
<p>This must also construct the union.width and union.height of the passed in union Rect argument.
This union must reflect the measured size of the panel.</p>
</div>
<h4 class="tsd-parameters-title">Parameters</h4>
<ul class="tsd-parameters">
<li>
<h5>panel: <a href="Panel.html" class="tsd-signature-type" data-tsd-kind="Class">Panel</a></h5>
<div class="tsd-comment tsd-typography">
<p>Panel which called this layout</p>
</div>
</li>
<li>
<h5>width: <span class="tsd-signature-type">number</span></h5>
<div class="tsd-comment tsd-typography">
<p>expected width of the panel</p>
</div>
</li>
<li>
<h5>height: <span class="tsd-signature-type">number</span></h5>
<div class="tsd-comment tsd-typography">
<p>expected height of the panel</p>
</div>
</li>
<li>
<h5>elements: <a href="GraphObject.html" class="tsd-signature-type" data-tsd-kind="Class">GraphObject</a><span class="tsd-signature-symbol">[]</span></h5>
<div class="tsd-comment tsd-typography">
<p>Array of Panel elements</p>
</div>
</li>
<li>
<h5>union: <a href="Rect.html" class="tsd-signature-type" data-tsd-kind="Class">Rect</a></h5>
<div class="tsd-comment tsd-typography">
<p>rectangle to contain the expected union bounds of every element in the Panel. Useful for arrange.</p>
</div>
</li>
<li>
<h5>minw: <span class="tsd-signature-type">number</span></h5>
<div class="tsd-comment tsd-typography">
<p>minimum width of the panel</p>
</div>
</li>
<li>
<h5>minh: <span class="tsd-signature-type">number</span></h5>
<div class="tsd-comment tsd-typography">
<p>minimum height of the panel</p>
</div>
</li>
</ul>
<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4>
</li>
</ul>
</section>
<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-class tsd-is-protected">
<a name="measureElement" class="tsd-anchor"></a>
<h3>
<span class="tsd-flag ts-flagProtected">Protected</span>
measure<wbr>Element
</h3>
<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-class tsd-is-protected">
<li class="tsd-signature tsd-kind-icon">measure<wbr>Element<span class="tsd-signature-symbol">(</span>obj<span class="tsd-signature-symbol">: </span><a href="GraphObject.html" class="tsd-signature-type" data-tsd-kind="Class">GraphObject</a>, width<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span>, height<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span>, minw<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span>, minh<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">void</span></li>
</ul>
<ul class="tsd-descriptions">
<li class="tsd-description">
<div class="tsd-comment tsd-typography">
<p>Given the available size, measure one element of the Panel and
determine its expected drawing size. Sets the measuredBounds of the object.</p>
</div>
<h4 class="tsd-parameters-title">Parameters</h4>
<ul class="tsd-parameters">
<li>
<h5>obj: <a href="GraphObject.html" class="tsd-signature-type" data-tsd-kind="Class">GraphObject</a></h5>
<div class="tsd-comment tsd-typography">
<p>Panel which called this layout</p>
</div>
</li>
<li>
<h5>width: <span class="tsd-signature-type">number</span></h5>
<div class="tsd-comment tsd-typography">
<p>expected width of the GraphObject</p>
</div>
</li>
<li>
<h5>height: <span class="tsd-signature-type">number</span></h5>
<div class="tsd-comment tsd-typography">
<p>expected height of the GraphObject</p>
</div>
</li>
<li>
<h5>minw: <span class="tsd-signature-type">number</span></h5>
<div class="tsd-comment tsd-typography">
<p>minimum width of the GraphObject</p>
</div>
</li>
<li>
<h5>minh: <span class="tsd-signature-type">number</span></h5>
<div class="tsd-comment tsd-typography">
<p>minimum height of the GraphObject</p>
</div>
</li>
</ul>
<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4>
</li>
</ul>
</section>
</section>
</div>
<div class="col-4 col-menu menu-sticky-wrap menu-highlight">
<nav class="tsd-navigation primary">
<ul>
<li class=" ">
<a href="../index.html">GoJS <wbr>Class <wbr>Index</a>
</li>
</ul>
</nav>
<nav class="tsd-navigation secondary menu-sticky">
<ul class="before-current">
</ul>
<ul class="current">
<li class="current tsd-kind-class">
<a href="PanelLayout.html" class="tsd-kind-icon">Panel<wbr>Layout</a>
<ul>
<li class=" tsd-kind-constructor tsd-parent-kind-class">
<a href="PanelLayout.html#constructor" class="tsd-kind-icon">constructor</a>
</li>
<li class=" tsd-kind-method tsd-parent-kind-class">
<a href="PanelLayout.html#arrange" class="tsd-kind-icon">arrange</a>
</li>
<li class=" tsd-kind-method tsd-parent-kind-class tsd-is-protected">
<a href="PanelLayout.html#arrangeElement" class="tsd-kind-icon">arrange<wbr>Element</a>
</li>
<li class=" tsd-kind-method tsd-parent-kind-class">
<a href="PanelLayout.html#measure" class="tsd-kind-icon">measure</a>
</li>
<li class=" tsd-kind-method tsd-parent-kind-class tsd-is-protected">
<a href="PanelLayout.html#measureElement" class="tsd-kind-icon">measure<wbr>Element</a>
</li>
</ul>
</li>
</ul>
<ul class="after-current">
</ul>
</nav>
</div>
</div>
</div>
<div class="container bottom-copyright plr15">
Copyright © 1998-2021 by Northwoods Software Corporation.
</div>
<div class="overlay"></div>
<script src="../assets/js/main.js"></script>
<script async src="https://www.googletagmanager.com/gtag/js?id=UA-1506307-5"></script>
<script>
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date()); gtag('config', 'UA-1506307-5');
// topnav
var topButton = document.getElementById("topnavButton");
var topnavList = document.getElementById("topnavList");
topButton.addEventListener("click", function() {
this.classList.toggle("active");
topnavList.classList.toggle("hidden");
document.getElementById("topnavOpen").classList.toggle("hidden");
document.getElementById("topnavClosed").classList.toggle("hidden");
});
</script>
</body>
</html>