create-gojs-kit
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A CLI for downloading GoJS samples, extensions, and docs
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<meta name="description" content="A diagram where each node contains a chart rendered by Chart.js." />
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<meta itemprop="name" content="Charts drawn by Chart.js in Nodes" />
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<title>
Charts drawn by Chart.js in Nodes | GoJS Diagramming Library
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<body>
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GoJS
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<a href="../api/">API</a>
<a href="../download.html">Download</a>
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// topnav
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if (topButton && topnavList) {
topButton.addEventListener("click", function (e) {
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<div class="flex flex-col prose">
<div class="w-full max-w-screen-xl mx-auto">
<!-- * * * * * * * * * * * * * -->
<!-- Start of GoJS sample code -->
<script src="https://cdn.jsdelivr.net/npm/gojs@3.1.0"></script>
<div id="allSampleContent" class="p-4 w-full">
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.bundle.min.js"></script>
<script id="code">
function init() {
myDiagram = new go.Diagram('myDiagramDiv', {
layout: new go.TreeLayout()
});
myDiagram.nodeTemplate =
new go.Node('Vertical')
.add(
new go.Panel('Auto')
.add(
new go.Shape({ fill: 'transparent' })
.bind('stroke', 'color'),
new go.Picture({ width: 300, height: 150, portId: '' })
.bind('element', 'datasets', makeLineChart)
),
new go.TextBlock({ margin: 8 })
.bind('text')
);
// This Binding conversion function creates a Canvas element for a Picture
// that has a rendering of a line chart drawn by Chart.js.
function makeLineChart(datasets, picture) {
var canvases = document.getElementById('myCanvases');
canv = document.createElement('canvas');
canv.width = canv.style.width = '600px';
canv.height = canv.style.height = '300px';
// apparently Chart.js expects the Canvas to be in a DIV
var div = document.createElement('div');
div.style.position = 'absolute';
div.appendChild(canv);
// add the DIV/Canvas to the DOM, temporarily
canvases.appendChild(div);
var config = {
// Chart.js configuration, including the DATASETS data from the model data
type: 'line',
data: {
labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
datasets: datasets
},
options: {
animation: {
onProgress: () => picture.redraw(),
onComplete: () => {
var canvases = document.getElementById('myCanvases');
if (canvases) {
// remove the Canvas that was in the DOM for rendering
canvases.removeChild(div);
}
picture.redraw();
}
}
}
};
new Chart(canv, config);
return canv;
}
myDiagram.model = new go.GraphLinksModel({
copiesArrays: true,
copiesArrayObjects: true,
nodeDataArray: [
{
key: 1,
text: 'Alpha',
datasets: [
{
label: 'Random data',
borderColor: 'black',
data: makeRandomPoints(8, 10)
}
]
},
{
key: 2,
text: 'Beta',
datasets: [
{
label: 'First dataset',
fill: false,
backgroundColor: 'red',
borderColor: 'red',
data: makeRandomPoints(8)
},
{
label: 'Second dataset',
fill: false,
backgroundColor: 'blue',
borderColor: 'blue',
data: makeRandomPoints(8)
}
]
},
{
key: 3,
text: 'Gamma',
color: 'green',
datasets: [
{
label: 'some data',
fill: false,
backgroundColor: 'green',
borderColor: 'green',
data: makeRandomPoints()
}
]
}
],
linkDataArray: [
{ from: 1, to: 2 },
{ from: 1, to: 3 }
]
});
}
function makeRandomPoints(num, range) {
if (!num) num = 20;
if (!range) range = 100;
var pts = [];
for (var i = 0; i < num; i++) {
pts.push(Math.random() * range);
}
return pts;
}
function addNode() {
myDiagram.model.commit(m => {
var firstnode = myDiagram.nodes.first();
var color = go.Brush.darken(go.Brush.randomColor());
var data = {
text: 'Node ' + (myDiagram.nodes.count + 1),
color: color,
datasets: [
{
label: 'some data',
fill: false,
backgroundColor: color,
borderColor: color,
data: makeRandomPoints()
}
]
};
m.addNodeData(data);
if (firstnode) {
m.addLinkData({ from: firstnode.key, to: m.getKeyForNodeData(data) });
// new node starts off at same location as the parent node
var newnode = myDiagram.findNodeForData(data);
if (newnode) newnode.location = firstnode.location;
}
}, 'added chart node');
}
function modifyNodes() {
myDiagram.commit(diag => {
diag.selection.each(node => {
var oldset = node.data.datasets;
if (!oldset) return; // if it's a link, there's no datasets property
diag.model.set(node.data, 'datasets', [
{
label: oldset[0].label,
fill: false,
backgroundColor: oldset[0].backgroundColor,
borderColor: oldset[0].borderColor,
data: makeRandomPoints()
}
]);
});
}, 'modified selected nodes');
}
window.addEventListener('DOMContentLoaded', init);
</script>
<div id="sample">
<div id="myDiagramDiv" style="border: solid 1px black; width: 100%; height: 600px"></div>
<button onclick="addNode()">Add Chart</button>
<button onclick="modifyNodes()">Modify Charts of Selected Nodes</button>
<p>
This app demonstrates using a popular charting library,
<a href="https://chartjs.org">Chart.js</a>, for rendering charts within nodes.
</p>
<p>
The data for each chart is stored on the node data in the model. In this case the
<code>datasets</code>
property value has the same properties that are expected by the Chart.js configuration, but you
could organize the data however you want.
</p>
<p>
The <code>makeLineChart</code> conversion function is used by a <a>Binding</a> on
<a>Picture.element</a> to generate a Canvas element that can be shown in the node. Most of the
implementation of that function is specific to Chart.js. The rendering requires the Canvas to be
in the HTML DOM. To avoid accumulating resources, the configuration of the chart defines an
<code>onComplete</code> event handler to remove the Canvas element from the DOM. That allows any
future removal of the Node from the Diagram not to leave an unused Canvas element behind.
</p>
<!-- myCanvases is used by makeLineChart, but need not be seen by the user -->
<div
id="myCanvases"
style="position: absolute; top: 0px; left: 0px; width: 0px; height: 0px; opacity: 0"></div>
</div>
</div>
<!-- * * * * * * * * * * * * * -->
<!-- End of GoJS sample code -->
</div>
<div id="allTagDescriptions" class="p-4 w-full max-w-screen-xl mx-auto">
<hr/>
<h3 class="text-xl">GoJS Features in this sample</h3>
<!-- blacklist tags that do not correspond to a specific GoJS feature -->
<!-- blacklist tags that do not correspond to a specific GoJS feature -->
<h4>HTML Interaction</h4>
<p>
GoJS Diagrams can be used alongside other HTML elements in a webapp.
For custom Text Editors, Context Menus, and ToolTips, which are invoked and hidden via GoJS tool operations, it is best to use the <a href="../api/symbols/HTMLInfo.html" target="api">HTMLInfo</a> class.
</p>
<p>
More information can be found in the <a href="../intro/HTMLinteraction.html">GoJS Intro</a>.
</p>
<p>
<a href="../samples/index.html#html">Related samples</a>
</p>
<hr>
<!-- blacklist tags that do not correspond to a specific GoJS feature -->
<h4>GoJS on Different Platforms</h4>
<p>
GoJS is intended to run in any environment that executes JavaScript.
This includes on browsers and within browser frameworks, and also in headless contexts such as Node.js.
</p>
<p>
We maintain examples for common frameworks:
</p>
<ul>
<li>
<strong>React:</strong> We provide a <a href="https://github.com/NorthwoodsSoftware/gojs-react" target="_blank" rel="noopener">React Component</a>
as an <a href="https://npmjs.com/gojs-react" target="_blank" rel="noopener">NPM package</a> and
a usage <a href="https://github.com/NorthwoodsSoftware/gojs-react-basic" target="_blank" rel="noopener">sample</a>.
See the intro page <a href="../intro/react.html">Using GoJS with React</a> for more information on React integration.
</li>
<li>
<strong>Angular:</strong> We provide an <a href="https://github.com/NorthwoodsSoftware/gojs-angular" target="_blank" rel="noopener">Angular Component</a>
as an <a href="https://npmjs.com/gojs-angular" target="_blank" rel="noopener">NPM package</a> and
a usage <a href="https://github.com/NorthwoodsSoftware/gojs-angular-basic" target="_blank" rel="noopener">sample</a>.
See the intro page <a href="../intro/angular.html">Using GoJS with Angular</a> for more information on Angular integration.
</li>
<li>
<strong>Vue:</strong> We provide a <a href="../samples/vue.html">Vue.js Sample</a>.
</li>
</ul>
<p>
More information, including usage on frameworks including Electron, Blazor, and node.js, can be found at the <a href="../intro/platforms.html">GoJS Intro</a>.
</p>
<p>
<a href="../samples/index.html#frameworks">Related samples</a>
</p>
<hr>
</div>
</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>