gojs
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Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
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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"/>
<meta name="description" content="A diagram holding groups that incrementally grow the diagram as groups are expanded."/>
<link rel="stylesheet" href="../assets/css/style.css"/>
<!-- Copyright 1998-2023 by Northwoods Software Corporation. -->
<title>Grouping</title>
</head>
<body>
<!-- This top nav is not part of the sample code -->
<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>
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<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">
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<hr class="border-b border-gray-600 opacity-50 my-0 py-0" />
</nav>
<div class="md:flex flex-col md:flex-row md:min-h-screen w-full max-w-screen-xl mx-auto">
<div id="navSide" class="flex flex-col w-full md:w-48 text-gray-700 bg-white flex-shrink-0"></div>
<!-- * * * * * * * * * * * * * -->
<!-- Start of GoJS sample code -->
<script src="../release/go.js"></script>
<div id="allSampleContent" class="p-4 w-full">
<script id="code">
function init() {
// Since 2.2 you can also author concise templates with method chaining instead of GraphObject.make
// For details, see https://gojs.net/latest/intro/buildingObjects.html
const $ = go.GraphObject.make; // for conciseness in defining templates
myDiagram =
new go.Diagram("myDiagramDiv", // Diagram refers to its DIV HTML element by id
{
layout: $(go.TreeLayout, // the layout for the entire diagram
{
angle: 90,
arrangement: go.TreeLayout.ArrangementHorizontal,
isRealtime: false
})
});
// define the node template for non-groups
myDiagram.nodeTemplate =
$(go.Node, "Auto",
$(go.Shape, "Rectangle",
{ stroke: null, strokeWidth: 0 },
new go.Binding("fill", "key")),
$(go.TextBlock,
{ margin: 7, font: "Bold 14px Sans-Serif" },
//the text, color, and key are all bound to the same property in the node data
new go.Binding("text", "key"))
);
myDiagram.linkTemplate =
$(go.Link,
{ routing: go.Link.Orthogonal, corner: 10 },
$(go.Shape, { strokeWidth: 2 }),
$(go.Shape, { toArrow: "OpenTriangle" })
);
// define the group template
myDiagram.groupTemplate =
$(go.Group, "Auto",
{ // define the group's internal layout
layout: $(go.TreeLayout,
{ angle: 90, arrangement: go.TreeLayout.ArrangementHorizontal, isRealtime: false }),
// the group begins unexpanded;
// upon expansion, a Diagram Listener will generate contents for the group
isSubGraphExpanded: false,
// when a group is expanded, if it contains no parts, generate a subGraph inside of it
subGraphExpandedChanged: group => {
if (group.memberParts.count === 0) {
randomGroup(group.data.key);
}
}
},
$(go.Shape, "Rectangle",
{ fill: null, stroke: "gray", strokeWidth: 2 }),
$(go.Panel, "Vertical",
{ defaultAlignment: go.Spot.Left, margin: 4 },
$(go.Panel, "Horizontal",
{ defaultAlignment: go.Spot.Top },
// the SubGraphExpanderButton is a panel that functions as a button to expand or collapse the subGraph
$("SubGraphExpanderButton"),
$(go.TextBlock,
{ font: "Bold 18px Sans-Serif", margin: 4 },
new go.Binding("text", "key"))
),
// create a placeholder to represent the area where the contents of the group are
$(go.Placeholder,
{ padding: new go.Margin(0, 10) })
) // end Vertical Panel
); // end Group
// generate the initial model
randomGroup();
}
// Generate a random number of nodes, including groups.
// If a group's key is given as a parameter, put these nodes inside it
function randomGroup(group) {
// all modification to the diagram is within this transaction
myDiagram.startTransaction("addGroupContents");
var addedKeys = []; // this will contain the keys of all nodes created
var groupCount = 0; // the number of groups in the diagram, to determine the numbers in the keys of new groups
myDiagram.nodes.each(node => {
if (node instanceof go.Group) groupCount++;
});
// create a random number of groups
// ensure there are at least 10 groups in the diagram
var groups = Math.floor(Math.random() * 2);
if (groupCount < 10) groups += 1;
for (var i = 0; i < groups; i++) {
var name = "group" + (i + groupCount);
myDiagram.model.addNodeData({ key: name, isGroup: true, group: group });
addedKeys.push(name);
}
var nodes = Math.floor(Math.random() * 3) + 2;
// create a random number of non-group nodes
for (var i = 0; i < nodes; i++) {
var color = go.Brush.randomColor();
// make sure the color, which will be the node's key, is unique in the diagram before adding the new node
if (myDiagram.findPartForKey(color) === null) {
myDiagram.model.addNodeData({ key: color, group: group });
addedKeys.push(color);
}
}
// add at least one link from each node to another
// this could result in clusters of nodes unreachable from each other, but no lone nodes
var arr = [];
for (var x in addedKeys) arr.push(addedKeys[x]);
arr.sort((x, y) => Math.random(2) - 1);
for (var i = 0; i < arr.length; i++) {
var from = Math.floor(Math.random() * (arr.length - i)) + i;
if (from !== i) {
myDiagram.model.addLinkData({ from: arr[from], to: arr[i] });
}
}
myDiagram.commitTransaction("addGroupContents");
}
window.addEventListener('DOMContentLoaded', init);
</script>
<div id="sample">
<div id="myDiagramDiv" style="height:600px;width:100%;border:1px solid black"></div>
<p>
This sample demonstrates subgraphs that are created only as groups are expanded.
</p>
<p>
The model is initially a random number of nodes, including some groups, in a tree layout.
When a group is expanded, the <a>Group.subGraphExpandedChanged</a> event handler calls a function to generate a random number of nodes
in a tree layout inside the group if it did not contain none any.
Each non-group node added has a unique random color, and links are added by giving each node one link to another node.
</p>
<p>
The addition of nodes and links is performed within a transaction to ensure that the diagram updates itself properly.
The diagram's tree layout and the tree layouts within each group are performed again when a sub-graph is expanded or collapsed.
</p>
</div>
</div>
<!-- * * * * * * * * * * * * * -->
<!-- End of GoJS sample code -->
</div>
</body>
<!-- This script is part of the gojs.net website, and is not needed to run the sample -->
<script src="../assets/js/goSamples.js"></script>
</html>