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<h1>Using GoJS with Node.js</h1>
<p>
As of 2.0, GoJS can be used in DOM-less contexts like Node.js. However there are some considerations:
<ul>
<li>
Since there is no Diagram DIV, you must instead set the <a>Diagram.viewSize</a> property.
This affects all the same values as the DIV size, like Diagram.position and layout results from layouts that are viewport-sized.
</li>
<li>Cannot measure go.Pictures, you must set a <a>GraphObject.desiredSize</a> instead.</li>
<li>Cannot measure go.TextBlocks accurately, you should set a <a>GraphObject.desiredSize</a> instead.</li></li>
</ul>
</p>
<p>
For server-side operations that need to measure Pictures or TextBlocks, you should consider using a headless browser with Node.
<a href="serverSideImages.html">Click here for examples using Node with Puppeteer (headless Chrome)</a>.
</p>
<h2 id="NodeJSExample">Node.js example</h2>
<p>
If you saved the following JavaScript as <code>nodescript.js</code> and run it with node (<code>node nodescript.js</code>),
it will output Model JSON results in the console, which include the locations of laid-out Nodes. You can use Node.js
in this way to do server-side operations like large layouts, and then send the JSON to the client.
</p>
<pre class="lang-js"><code>
// nodescript.js
// This example loads the GoJS library, creates a Diagram with a layout and prints the JSON results.
// Load GoJS. This assumes using require and CommonJS:
const go = require("gojs");
const myDiagram =
new go.Diagram('', // No DOM, so there can be no DIV!
{
viewSize: new go.Size(400,400), // Set this property in DOM-less environments
layout: new go.LayeredDigraphLayout()
});
myDiagram.nodeTemplate =
new go.Node('Auto',
// specify the size of the node rather than measuring the size of the text
{ width: 80, height: 40 })
// automatically save the Node.location to the node's data object
.bindTwoWay('location', 'loc', go.Point.parse, go.Point.stringify)
.add(
new go.Shape('RoundedRectangle', { strokeWidth: 0})
.bind('fill', 'color'),
new go.TextBlock()
.bind('text', 'key')
);
// After the layout, output results:
myDiagram.addDiagramListener('InitialLayoutCompleted', () => console.log(myDiagram.model.toJson()) );
// load a model:
myDiagram.model = new go.GraphLinksModel(
[
{ key: 'Alpha', color: 'lightblue' },
{ key: 'Beta', color: 'orange' },
{ key: 'Gamma', color: 'lightgreen' },
{ key: 'Delta', color: 'pink' }
],
[
{ from: 'Alpha', to: 'Beta' },
{ from: 'Alpha', to: 'Gamma' },
{ from: 'Gamma', to: 'Delta' },
{ from: 'Delta', to: 'Alpha' }
]);
</code></pre>
<p>
Alternatively, if your code is saved as <code>nodescript.mjs</code> or your project is of <code>"type": "module"</code>,
you can use GoJS as an ECMAScript module:
</p>
<pre class="lang-js"><code>
// nodescript.mjs
// This example loads the GoJS library, creates a Diagram with a layout and prints the JSON results.
// Load GoJS. This assumes using import and ECMAScript modules:
import * as go from "gojs";
. . .
</code></pre>
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