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HTML

              
                <script src="https://gojs.net/latest/release/go.js"></script>


<body>

  <div id="sample">
    <div id="myDiagramDiv" style="border: solid 1px black; width:100%; height:400px; background: #444"></div>
    <button onclick="load()">Load</button>
    <button onclick="save()">Save</button>
    <textarea id="mySavedModel" style="width:100%;height:250px">
{ "class": "go.GraphLinksModel",
  "nodeDataArray": [
{"key":1, "text":"Alpha", "color":"lightblue"},
{"key":2, "text":"Beta", "color":"orange"},
{"key":3, "text":"Gamma", "color":"lightgreen"}
 ],
  "linkDataArray": [
{"from":1, "to":2},
{"from":1, "to":3}
 ]}
    </textarea>

  </div>
</body>
              
            
!

CSS

              
                
              
            
!

JS

              
                  // Assume that a Link may have a  linkdata.colors  property that is an Array of CSS color strings.
  // Also assume that each Link has as many Shapes in it that are marked with  isPanelMain: true
  // as you want to get a color from the data.colors Array.
  function MultiColorLink() {
    go.Link.call(this);
  }
  go.Diagram.inherit(MultiColorLink, go.Link);

  MultiColorLink.prototype.makeGeometry = function() {
    var geo = go.Link.prototype.makeGeometry.call(this);
    var shape = this.findObject('highlightPath');
    // length of the colored section is 1/5th of the path
    var seclen = geo.flattenedTotalLength / 5;
    // make the dash array big enough that the section only presents at the middle
    // so start at 2/5ths, to give the middle 5th the color
    shape.strokeDashArray = [0, 2 * seclen, seclen, 99999];
    return geo;
  }

  function init() {
    var $ = go.GraphObject.make;

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

    myDiagram.nodeTemplate =
      $(go.Node, "Auto",
        { fromSpot: go.Spot.AllSides, toSpot: go.Spot.AllSides },
        $(go.Shape,
          { fill: "white", strokeWidth: 0 },
          new go.Binding("fill", "color")),
        $(go.TextBlock,
          { margin: 12 },
          new go.Binding("text"))
      );

    function linkPath() {  // common styling for each section
      return $(go.Shape, { isPanelMain: true, strokeWidth: 5 });
    }

    myDiagram.linkTemplate =
      $(MultiColorLink,
        {
          routing: go.Link.AvoidsNodes, corner: 10,
          relinkableFrom: true, relinkableTo: true,
          reshapable: true, resegmentable: true
        },
        $(go.Shape, { isPanelMain: true, strokeWidth: 5 }),
        $(go.Shape, { isPanelMain: true, strokeWidth: 5, name: 'highlightPath', stroke: 'lime' })
      );

    load();
  } // end init

  function save() {
    document.getElementById("mySavedModel").value = myDiagram.model.toJson();
    myDiagram.isModified = false;
  }
  function load() {
    myDiagram.model = go.Model.fromJson(document.getElementById("mySavedModel").value);
  }

init();



              
            
!
999px

Console