In SelectionDeleting how to detect the node which is going to be deleted

GoJS
1

Hi,
I was using SelectionDeleting Event to join link of the node’s parent who is going to be deleted to the node’s child(s).
Here I tried to use e.subject but even when i am trying to delete single node it is giving the set of 2 nodes.
Can you please guide, that i am going on right direction and if so how to approach further,
So that i can identify node and can add link from it’s parent to its all childs.

2

Here is one way to do it. You will want to examine it carefully and adapt the code to make sure it meets your requirements.

<!DOCTYPE html>
<html>
<head>
<title>Minimal GoJS Sample</title>
<!-- Copyright 1998-2020 by Northwoods Software Corporation. -->
<meta charset="UTF-8">
<script src="go.js"></script>
<script id="code">
  function init() {
    var $ = go.GraphObject.make;

    myDiagram =
      $(go.Diagram, "myDiagramDiv",
        {
          "undoManager.isEnabled": true,
          layout: $(go.TreeLayout),
          "SelectionDeleting": function(e) {
            e.subject.each(function(node) {
              if (!(node instanceof go.Node)) return;
              node.findNodesInto().each(function(from) {
                node.findNodesOutOf().each(function(to) {
                  // don't create duplicate links??
                  if (from.findLinksTo(to).count > 0) return;
                  var model = to.diagram.model;
                  // NOTE: simplify this code depending on which kind of model you are using
                  if (model instanceof go.GraphLinksModel) {
                    var newlinkdata = {};  // add whatever properties you need
                    model.setFromKeyForLinkData(newlinkdata, from.key);
                    model.setToKeyForLinkData(newlinkdata, to.key);
                    model.addLinkData(newlinkdata);
                  } else if (model instanceof go.TreeModel) {
                    model.setParentKeyForNodeData(to.data, from.key);
                  }
                });
              });
            });
          }
        });

    myDiagram.nodeTemplate =
      $(go.Node, "Auto",
        $(go.Shape,
          { fill: "white", portId: "", fromLinkable: true, toLinkable: true, cursor: "pointer" },
          new go.Binding("fill", "color")),
        $(go.TextBlock,
          { margin: 8, editable: true },
          new go.Binding("text").makeTwoWay())
      );

    myDiagram.model = new go.GraphLinksModel(
    [
      { key: 1, text: "Alpha", color: "lightblue" },
      { key: 2, text: "Beta", color: "orange" },
      { key: 3, text: "Gamma", color: "lightgreen" },
      { key: 4, text: "Delta", color: "pink" },
      { key: 5, text: "Epsilon", color: "yellow" }
    ],
    [
      { from: 1, to: 2 },
      { from: 1, to: 3 },
      { from: 3, to: 4 },
      { from: 3, to: 5 }
    ]);
  }
</script>
</head>
<body onload="init()">
  <div id="myDiagramDiv" style="border: solid 1px black; width:100%; height:600px"></div>
</body>
</html>