SVG Port Tooltips

by Roman Bruckner

HTML

<html>
<head>
    <link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/jointjs/3.6.2/joint.css" />
</head>
<body>
      <!-- content -->
      <div id="paper"></div>
      <button id="toggle">
       tooltips on/off
      </button>
      <!-- dependencies -->
        <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.1/jquery.js"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.20/lodash.min.js"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.4.0/backbone.js"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/jointjs/3.6.2/joint.js"></script>
    
    </body>
</html>

CSS

button { position: absolute; top: 10px; left: 10px; }

JavaScript

const graph = new joint.dia.Graph({}, {
  cellNamespace: joint.shapes
});

const paper = new joint.dia.Paper({
  el: document.getElementById('paper'),
  width: 800,
  height: 900,
  model: graph,
  cellViewNamespace: joint.shapes,
  gridSize: 10,
  async: true,
  sorting: joint.dia.Paper.sorting.APPROX,
});

const rect1 = new joint.shapes.standard.Rectangle({
  ports: {
    groups: {
      'in': {
        position: {
          name: 'left'
        }
      },
      'out': {
        position: {
          name: 'right'
        }
      }
    }
  }
});
rect1.position(100, 50);
rect1.resize(100, 100);
rect1.addPorts([{
  id: 'port1',
  group: 'in'
}, {
  id: 'port2',
  group: 'out',
  name: 'Port Number 1'
}, {
  id: 'port3',
  group: 'out',
  name: 'Port Number 2'
}]);

const rect2 = rect1.clone();
rect2.position(300, 200);
rect2.removePorts().addPorts([{
  id: 'port1',
  group: 'in'
}, {
  id: 'port2',
  group: 'out',
  name: 'Another Port 1'
}, {
  id: 'port3',
  group: 'out',
  name: 'Another Port 2'
}]);


graph.addCells([rect1, rect2]);

paper.on('element:mouseover', function(elementView, evt) {
  if (allTooltipsShown) return;
  if (elementView.findAttribute('port-group', evt.target) === 'out') {
    showOutputPortsInfo(elementView.model);
  }
});

paper.on('element:mouseout', function(elementView, evt) {
  if (allTooltipsShown) return;
  if (elementView.findAttribute('port-group', evt.target) === 'out') {
    hideAllOutputPortsInfo(graph);
  }
});

function showOutputPortsInfo(element) {
  const positions = element.getPortsPositions('out');
  Object.keys(positions).forEach((portId) => {
    const elementPosition = element.position();
    const portPosition = positions[portId];
    const {
      name
    } = element.getPort(portId);
    const tooltip = new joint.shapes.standard.Path({
      size: {
        width: 100,
        height: 30
      },
      position: {
        x: elementPosition.x + portPosition.x + 30,
        y: elementPosition.y + portPosition.y -...