Expanded and Closed Groups

A simple doubt, as it would be possible to indicate in the nodeDataArray[], if I want the group expanded or closed


nodeDataArray: [
{“key”:1, “text”:“Node 1”, “isGroup”:true, “expanded”:“false”},
{“key”:2, “text”:“Node 2”, “isGroup”:true, “expanded”:“true”},


Bind the isSubGraphExpanded property on the Group. See, for example, https://gojs.net/latest/samples/swimLanes.html

new go.Binding("isSubGraphExpanded", "expanded").makeTwoWay(),
1 Like

Hello, thank you very much for your answer.
I have a problem, the nodes that are inside the “expanded: false” group are not shown when I open the group.

That is certainly not the default behavior, as you can see in the Regrouping sample. What changes have you made to the group template?

This is my group template

GO(go.Group, “Auto”,
ungroupable: true,
mouseDragEnter: function(e, grp, prev) { highlightGroup(e, grp, true); },
mouseDragLeave: function(e, grp, next) { highlightGroup(e, grp, false); },
computesBoundsAfterDrag: true,
mouseDrop: finishDrop,
handlesDragDropForMembers: true,
layout: layoutTree
new go.Binding(“location”, “loc”).makeTwoWay(),
new go.Binding(“isSubGraphExpanded”, “expanded”).makeTwoWay(),
GO(go.Shape, “Rectangle”, { fill: null, stroke: “gray” }, new go.Binding(‘fill’,‘color’)),
GO(go.Panel, “Table”, { margin: 0.5 },
GO(go.RowColumnDefinition, { row: 0, background: “white” }),
GO(“SubGraphExpanderButton”, { row: 0, column: 0, margin: 3 }),
GO(go.TextBlock, { margin: 5, editable: false , row: 0, column: 1, font: “bold 13px Sans-Serif”, stroke: “black”, textAlign: “left”, stretch: go.GraphObject.Horizontal } ,
new go.Binding(“text”)
GO(go.Placeholder, { row: 1, columnSpan: 2, padding: 50, alignment: go.Spot.TopLeft },
new go.Binding(“padding”, “isSubGraphExpanded”,
function(exp) {
return exp ? 25 : 10;

What is layoutTree?

layoutTree = GO(go.Layout, { });

That should be the same as not setting the Group.layout property at all. I just tried modifying the samples/regrouping.html sample by adding:

  { . . .,
    isSubGraphExpanded: false,
    layout: $(go.Layout, {})
  new go.Binding("isSubGraphExpanded", "expanded").makeTwoWay(),

to both group templates, and everything worked as I believe you would expect.

So I cannot explain why you are getting that behavior. Could you please tell us how to reproduce the problem?

Oh, I noticed that the value in your JSON for “expanded” should be false or true – a boolean value, not a string. However that does not explain your problem.