Hover

interactions

This example shows how to use the mouseover and mouseout event to display information about the element the mouse is hovering over.

index.tsindex.htmlstyles.css

import Ogma from '@linkurious/ogma';

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

const info = document.getElementById('info') as HTMLDivElement;

ogma.events
  .on('mouseover', evt => {
    if (evt.target) {
      const { target, x, y } = evt;
      info.innerHTML = `Hovered ${
        target.isNode ? 'node' : 'edge'
      } ${target.getId()} at position (${x}, ${y})`;
    }
  })
  .on('mouseout', evt => {
    if (evt.target) {
      const { target, x, y } = evt;
      info.innerHTML = `Unhovered ${
        target.isNode ? 'node' : 'edge'
      } ${target.getId()} at position (${x}, ${y})`;
    }
  });

ogma.styles.addNodeRule({
  text: {
    content: n => 'Node ' + n.getId()
  }
});

ogma.styles.addEdgeRule({
  text: {
    content: e => 'Edge ' + e.getId()
  }
});

ogma.generate
  .random({ nodes: 5, edges: 10 })
  .then(ogma.setGraph)
  .then(() => ogma.view.locateGraph());

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">Hover some nodes or edges</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;
  top: 10px;
  left: 10px;
  z-index: 100;
  padding: 1em;
  color: rgba(255, 255, 255, 1);
  background: rgba(0, 90, 200, 1);
  border-radius: 5px;
  min-width: 20%;
  font-family: Georgia, 'Times New Roman', Times, serif;
  pointer-events: none;
}

Hover ​

Hover