How to check port is linked or not

GoJS
1

Hi @walter,
The node can have multiple ports so that I need data like below

(start node) A port is linked to another node port and
(start node) B port is not linked

is there any API like using the start node it will give data like above

2

I don’t understand what you want. Could you please post a small screenshot or sketch of what you want and then explain your question again?

3

@walter,

Consider two nodes, start and end node. Both start and end nodes have multiple ports. Let’s assume that the start and end node is connected by using a single port in both nodes. Now there are other free ports in the start node. Now, I’m expecting a function that will return the ports used, nodes connected to it, and the free port present.
For example, if I send a start node, I need to get information regarding the nodes connected (Along with port details) and also free ports.

image

As shown in the above image, I’ll be passing a start node and am expecting an output similar to this. Kindly, give your suggestion.

Output:
{
  port A linked to X port of End node
  port B - no link
}
4 
<!DOCTYPE html>
<html>
<head>
  <title>Minimal GoJS Sample</title>
  <!-- Copyright 1998-2021 by Northwoods Software Corporation. -->
</head>
<body>
  <div id="myDiagramDiv" style="border: solid 1px black; width:100%; height:600px"></div>

  <script src="https://unpkg.com/gojs"></script>
  <script id="code">
function init() {
  const $ = go.GraphObject.make;

  myDiagram =
    $(go.Diagram, "myDiagramDiv",
      {
        "undoManager.isEnabled": true
      });

  function makePort(id, spot) {
    return $(go.Shape,
             { portId: id, alignment: spot,
               fromLinkable: true, toLinkable: true,
               width: 8, height: 8, fill: "gray", strokeWidth: 0 });
  }

  myDiagram.nodeTemplate =
    $(go.Node, "Auto",
      {
        click: (e, node) => {
          console.log(`${node.key}: ${node.data.text}`)
          node.ports.each(p => {
            console.log(`  "${p.portId}" ${node.findLinksConnected(p.portId).count}`)
            node.findLinksConnected(p.portId).each(l => {
              console.log(`    ${l.fromNode.key},${l.fromPort.portId} --> ${l.toNode.key},${l.toPort.portId}`)
            });
          });
        }
      },
      $(go.Shape,
        { fill: "white", portId: "", fromLinkable: true, toLinkable: true, cursor: "pointer" },
        new go.Binding("fill", "color")),
      $(go.TextBlock,
        { margin: 12, editable: true },
        new go.Binding("text").makeTwoWay()),
      makePort("T", go.Spot.Top),
      makePort("R", go.Spot.Right),
      makePort("B", go.Spot.Bottom),
      makePort("L", go.Spot.Left)
    );

  myDiagram.model = $(go.GraphLinksModel,
    {
      linkFromPortIdProperty: "fpid",
      linkToPortIdProperty: "tpid",
      nodeDataArray:
        [
          { key: 1, text: "Alpha", color: "lightblue" },
          { key: 2, text: "Beta", color: "orange" },
          { key: 3, text: "Gamma", color: "lightgreen" },
          { key: 4, text: "Delta", color: "pink" }
        ],
      linkDataArray:
        [
          { from: 1, fpid: "R", to: 2, tpid: "L" },
          { from: 1, fpid: "B", to: 3, tpid: "T" },
        ]
      });
}
window.addEventListener('DOMContentLoaded', init);
  </script>
</body>
</html>