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Count nodes and edges ​

interactionsanalysis

This example shows how to get the number of nodes and edges in the graph using the getNodes and getEdges methods.

ts
import Ogma from '@linkurious/ogma';

const ogma = new Ogma({
  container: 'graph-container'
});

// Generate a random graph
ogma.generate
  .random({
    nodes: 7,
    edges: 10
  })
  // Assign the graph to Ogma.
  .then(g => ogma.setGraph(g))
  .then(() => ogma.layouts.force({ locate: true, duration: 0 }))
  .then(() => {
    // Retrieve the number of nodes and edges.
    const nodes = ogma.getNodes();
    const edges = ogma.getEdges();

    // Update the html code.
    document.getElementById('info_nodes')!.textContent = 'Nodes: ' + nodes.size;
    document.getElementById('info_edges')!.textContent = 'Edges: ' + edges.size;
  });
html
<!doctype html>
<html>
  <head>
    <meta charset="utf-8" />

    <link type="text/css" rel="stylesheet" href="styles.css" />
  </head>
  <body>
    <div id="graph-container"></div>
    <div id="info_nodes" class="info n"></div>
    <div id="info_edges" class="info e"></div>
    <script type="module" src="index.ts"></script>
  </body>
</html>
css
#graph-container {
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  position: absolute;
  margin: 0;
  overflow: hidden;
}
.info {
  position: absolute;
  color: #fff;
  background: #141229;
  font-size: 20px;
  font-family: monospace;
  padding: 8px;
}

.info.n {
  top: 5px;
  right: 15px;
}

.info.e {
  top: 45px;
  right: 15px;
}