gojs

<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"/> <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no, viewport-fit=cover"/> <link rel="stylesheet" href="../assets/css/style.css"/>  <title> GoJS Groups -- Northwoods Software </title> <link rel="stylesheet" href="../assets/css/prism.css" /> </head> <script> window.diagrams = []; window.goCode = function(pre, w, h, parentid, animation) { window.diagrams.push([pre, w, h, parentid, animation]); } </script> <body> <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="my-0 p-1 ">GoJS</h1> </a> </div> <button id="topnavButton" class="rounded-lg sm:hidden focus:outline-none 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md:overflow-y-auto break-words"> <a href="index.html">Basics</a> <a href="buildingObjects.html">Building Parts</a> <a href="usingModels.html">Using Models</a> <a href="dataBinding.html">Data Binding</a> <a href="react.html">GoJS with React</a> <a href="angular.html">GoJS with Angular</a> <a href="textBlocks.html">TextBlocks</a> <a href="shapes.html">Shapes</a> <a href="pictures.html">Pictures</a> <a href="panels.html">Panels</a> <a href="tablePanels.html">Table Panels</a> <a href="brush.html">Brushes</a> <a href="sizing.html">Sizing Objects</a> <a href="itemArrays.html">Item Arrays</a> <a href="changedEvents.html">Changed Events</a> <a href="transactions.html">Transactions</a> <a href="viewport.html">Coordinates</a> <a href="initialView.html">Initial View</a> <a href="collections.html">Collections</a> <a href="links.html">Links</a> <a href="linkLabels.html">Link Labels</a> <a href="connectionPoints.html">Link Points</a> <a href="ports.html">Ports</a> <a href="nodes.html">Nodes</a> <a href="typings.html">Typings</a> <a href="debugging.html">Debugging</a> <a href="layouts.html">Layouts</a> <a href="trees.html">Trees</a> <a href="subtrees.html">SubTrees</a> <a href="groups.html">Groups</a> <a href="subgraphs.html">SubGraphs</a> <a href="sizedGroups.html">Sized Groups</a> <a href="selection.html">Selection</a> <a href="highlighting.html">Highlighting</a> <a href="animation.html">Animation</a> <a href="toolTips.html">ToolTips</a> <a href="contextmenus.html">Context Menus</a> <a href="events.html">Diagram Events</a> <a href="tools.html">Tools</a> <a href="commands.html">Commands</a> <a href="permissions.html">Permissions</a> <a href="validation.html">Validation</a> <a href="HTMLInteraction.html">HTML Interaction</a> <a href="layers.html">Layers & Z-ordering</a> <a href="palette.html">Palette</a> <a href="overview.html">Overview</a> <a href="resizing.html">Resizing Diagrams</a> <a href="replacingDeleting.html">Replacing and Deleting</a> <a href="buttons.html">Buttons</a> <a href="templateMaps.html">Template Maps</a> <a href="legends.html">Legends and Titles</a> <a href="extensions.html">Extensions</a> <a href="geometry.html">Geometry Strings</a> <a href="grids.html">Grid Patterns</a> <a href="graduatedPanels.html">Graduated Panels</a> <a href="makingImages.html">Diagram Images</a> <a href="makingSVG.html">Diagram SVG</a> <a href="printing.html">Printing</a> <a href="serverSideImages.html">Server-side Images</a> <a href="nodeScript.html">GoJS in Node.js</a> <a href="testing.html">Testing</a> <a href="storage.html">Storage</a> <a href="performance.html">Performance</a> <a href="source.html">Building from Source</a> <a href="platforms.html">Platforms</a> <a href="deployment.html">Deployment</a> </nav> </div> <div class="pt-4 px-2 md:px-0 lg:px-4 pb-16 w-full overflow-hidden"> <h1>Groups</h1> <p> Use the <a>Group</a> class to treat a collection of <a>Node</a>s and <a>Link</a>s as if they were a single <a>Node</a>. Those nodes and links are members of the group; together they constitute a subgraph. </p> <p> A subgraph is <em>not</em> another <a>Diagram</a>, so there is no separate HTML Div element for the subgraph of a group. All of the <a>Part</a>s that are members of a <a>Group</a> belong to the same Diagram as the Group. There can be links between member nodes and nodes outside of the group as well as links between the group itself and other nodes. There can even be links between member nodes and the containing group itself. </p> <p> Groups can also be collapsed and expanded, to hide or show the member parts. </p> <p> The member parts of a group are available via the <a>Group.memberParts</a> property. Conversely, the <a>Part.containingGroup</a> property refers to the group, if the part belongs to one. A part can be member of at most one group at a time. You can set that property in order to add that part to a group. However you must make sure that no group contains itself, either directly or indirectly through other groups. </p> <p> Because every <a>Group</a> is a <a>Node</a>, you can have nested groups. Although member <a>Node</a>s and <a>Link</a>s belong to the <a>Group</a> that contains them, they are not in the visual tree of the group -- their <a>GraphObject.panel</a> is null and no member part is in the group's <a>Panel.elements</a> collection. No <a>Part</a> can be in the visual tree of another <a>Part</a>. Parts normally do belong directly to one <a>Layer</a>. </p> <p> See samples that make use of Groups in the <a href="../samples/index.html#groups">samples index</a>. </p> <h2 id="SimpleGroups">Simple Groups</h2> <p> In a <a>GraphLinksModel</a> the <a>Model.nodeDataArray</a> holds node data, each of which might be represented by a <a>Group</a> rather than by a regular <a>Node</a>. You can declare that it should be a group by setting the isGroup data property to true. You can declare that a node data be a member of a group by referring to the group's key as the group data property value. </p> <p> Here is a group containing two nested groups as well as two regular nodes. If you move a group, its member parts move along. If you copy a group, its member parts are copied too. If you delete a group, its member parts are deleted too. If you move a member node, its containing group inflates or shrinks to cover the area occupied by all of the members. </p> <pre class="lang-js" id="simple"><code> diagram.model.nodeDataArray = [ { key: "Alpha", isGroup: true }, { key: "Beta", group: "Alpha" }, { key: "Gamma", group: "Alpha", isGroup: true }, { key: "Delta", group: "Gamma" }, { key: "Epsilon", group: "Gamma" }, { key: "Zeta", group: "Alpha" }, { key: "Eta", group: "Alpha", isGroup: true}, { key: "Theta", group: "Eta" } ]; </code></pre> <script>goCode("simple", 600, 200)</script> <h3 id="GroupsLinks">Groups and Links</h2> <p> Because <a>Group</a>s are <a>Node</a>s, a <a>Link</a> may connect with a group as well as with a plain node. </p> <p> Here is a simple example of four regular nodes and one group node. In this example the link from "Alpha" goes directly to the "Beta" node, but the link to "Delta" actually comes from the "Omega" group rather than from any particular member of the group. </p> <pre class="lang-js" id="links"><code> var nodeDataArray = [ { key: "Alpha" }, { key: "Beta", group: "Omega" }, { key: "Gamma", group: "Omega" }, { key: "Omega", isGroup: true }, { key: "Delta" } ]; var linkDataArray = [ { from: "Alpha", to: "Beta" }, // from outside the Group to inside it { from: "Beta", to: "Gamma" }, // this link is a member of the Group { from: "Omega", to: "Delta" } // from the Group to a Node ]; diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray); </code></pre> <script>goCode("links", 600, 150)</script> <p> If you drag the "Delta" node around you can see how the link from the "Omega" group appears to come from the center of the group and start at the group's edge rather than at any member node. This is different than for the link from "Alpha" to "Beta". </p> <p> Note also how the link from "Beta" to "Gamma" is effectively owned by the "Omega" group because both of the nodes are owned by that group. Copying the group automatically copies the link too. </p> <p> This example did not set any of the following properties: <a>Diagram.nodeTemplate</a>, <a>Diagram.groupTemplate</a>, and <a>Diagram.linkTemplate</a>, in order to demonstrate the default templates for all kinds of node data and link data. </p> <h2 id="GroupTemplates">Group Templates</h2> <p> Here is an example of how one might define templates for nodes and for groups. The node template is very simple: some text inside an ellipse. The group template is different from a node template in several aspects. </p> <p> First, the group template builds a go.Group, not a go.Node or go.Part. The group can use a number of the panel types, just as a node may use various panel types. </p> <p> Second, the group template includes a <a>Placeholder</a> object. This object, of which you may have at most one within the visual tree of a group, gets the size and position of the union of the bounds of the member parts, plus some padding. The use of a Placeholder results in the Group surrounding the collection of group members, no matter where the member nodes are placed. </p> <pre class="lang-js" id="groupTemplates"><code> diagram.nodeTemplate = $(go.Node, "Auto", $(go.Shape, "Ellipse", { fill: "white" }), $(go.TextBlock, new go.Binding("text", "key")) ); diagram.groupTemplate = $(go.Group, "Vertical", $(go.Panel, "Auto", $(go.Shape, "RoundedRectangle", // surrounds the Placeholder { parameter1: 14, fill: "rgba(128,128,128,0.33)" }), $(go.Placeholder, // represents the area of all member parts, { padding: 5}) // with some extra padding around them ), $(go.TextBlock, // group title { alignment: go.Spot.Right, font: "Bold 12pt Sans-Serif" }, new go.Binding("text", "key")) ); var nodeDataArray = [ { key: "Alpha" }, { key: "Beta", group: "Omega" }, { key: "Gamma", group: "Omega" }, { key: "Omega", isGroup: true }, { key: "Delta" } ]; var linkDataArray = [ { from: "Alpha", to: "Beta" }, // from outside the Group to inside it { from: "Beta", to: "Gamma" }, // this link is a member of the Group { from: "Omega", to: "Delta" } // from the Group to a Node ]; diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray); </code></pre> <script>goCode("groupTemplates", 600, 200)</script> <p> Note how when you move the "Beta" or "Gamma" nodes the "Omega" group automatically resizes so that the TextBlock on the group stays below and on the right side of the "RoundedRectangle" shape. </p> <p> Just as a <a>Diagram</a> can have its own <a>Layout</a>, a <a>Group</a> can have its own <a>Group.layout</a>. This is discussed in the page about <a href="subgraphs.html">SubGraphs</a>. </p> </div> </div> <div class="bg-nwoods-primary"> <section class="max-w-screen-lg text-white container mx-auto py-2 px-12"> <p id="version" class="leading-none mb-2 my-4">GoJS</p> </section> </div><footer class="bg-nwoods-primary text-white"> <div class="container max-w-screen-lg mx-auto px-8"> <div class="w-full py-6"> <div class="max-w-screen-lg xl:max-w-screen-xl mx-auto px-4 sm:px-6 md:px-8"> <ul class="text-sm font-medium pb-6 grid grid-cols-2 sm:grid-cols-3 gap-y-10"> <li class="list-none row-span-2"> <h2 class="text-base font-semibold tracking-wide">GoJS</h2> <ul class="list-none space-y-4 md:space-y-1 px-0"> <li> <a href="../samples/index.html">Samples</a> </li> <li> <a href="../learn/index.html">Learn</a> </li> <li> <a href="../intro/index.html">Intro</a> </li> <li> <a href="../api/index.html">API</a> </li> <li> <a href="../changelog.html">Changelog</a> </li> <li> <a href="https://github.com/NorthwoodsSoftware/GoJS">GitHub</a> </li> </ul> </li> <li class="list-none row-span-2"> <h2 class="text-base font-semibold tracking-wide">Support</h2> <ul class="list-none space-y-4 md:space-y-1 px-0"> <li> <a href="https://www.nwoods.com/contact.html" target="_blank" rel="noopener" onclick="getOutboundLink('https://www.nwoods.com/contact.html', 'contact');">Contact</a> </li> <li> <a href="https://forum.nwoods.com/c/gojs">Forum</a> </li> <li> <a href="https://www.nwoods.com/app/activate.aspx?sku=gojs">Activate</a> </li> <li> <a href="https://www.nwoods.com/sales/index.html" target="_blank" rel="noopener" onclick="getOutboundLink('https://www.nwoods.com/sales/index.html', 'buy');">Buy</a> </li> <li> <a href="https://www.youtube.com/channel/UC9We8EoX596-6XFjJDtZIDg">Videos</a> </li> </ul> </li> <li class="list-none row-span-2"> <h2 class="text-base font-semibold tracking-wide">Company</h2> <ul class="list-none space-y-4 md:space-y-1 px-0"> <li> <a target="_blank" href="https://www.nwoods.com">Northwoods</a> </li> <li> <a target="_blank" href="https://www.nwoods.com/about.html">About Us</a> </li> <li> <a target="_blank" href="https://www.nwoods.com/contact.html">Contact Us</a> </li> <li> <a target="_blank" href="https://www.nwoods.com/consulting.html">Consulting</a> </li> <li> <a target="_blank" href="https://twitter.com/northwoodsgo">Twitter</a> </li> </ul> </li> </ul> <p class="text-sm text-gray-100 md:mb-6"> Copyright 1998-2023 <a class="text-white" href="https://www.nwoods.com">Northwoods Software</a> </p> </div> </div> </footer> </body> <script async src="https://www.googletagmanager.com/gtag/js?id=G-S5QK8VSK84"></script> <script> window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'G-S5QK8VSK84'); var getOutboundLink = function(url, label) { gtag('event', 'click', { 'event_category': 'outbound', 'event_label': label, 'transport_type': 'beacon' }); } // 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> <script src="../assets/js/prism.js"></script> <script src="../release/go.js"></script> <script src="../assets/js/goDoc.js"></script> <script> document.addEventListener("DOMContentLoaded", function() { if (window.go) document.getElementById('version').textContent = "GoJS version " + go.version; if (window.goDoc) window.goDoc(); var d = window.diagrams; for (var i = 0; i < d.length; i++) { var dargs = d[i]; goCodeExecute(dargs[0], dargs[1], dargs[2], dargs[3], dargs[4]); } if (window.extra) window.extra(); }); </script> </html>