Collapse all nodes when doubleclick

GoJS
1

Hi,
Sorry if this is an obvious question but im still learning GoJS (which is great btw)
so my question is how can i collapse all nodes when doubleclicking on one of them ?
I want to be have only one expanded node at all time

here is my code :

go.Node, {
    selectionAdorned: false,
    isTreeExpanded: false,

    doubleClick: (e, node) => {

        let cmd = myTreeLocal.commandHandler;
        if (!node.isTreeLeaf) {
            if (!node.isTreeExpanded) {
                if (!cmd.canExpandTree(node)) return;
                cmd.expandTree(node);
                NetworkActions.requestNetworkbyId(node.Zd.dataKey);
            }
        } else {
        }
    }
},

Thank you !

2

When you say you only want at most one node to be expanded, are you not including the root node? I’ll assume that’s the case and that you want to show three levels of the tree (root, children, and grandchildren) but you only want to show the grandchildren of at most one child node.

I suggest that you do something like:

    myDiagram.nodeTemplate =
      $(go.Node, . . .,
        {
          isTreeExpanded: false,
          doubleClick: function(e, node) {
            var diag = e.diagram;
            if (node.isTreeExpanded) {
              diag.commandHandler.collapseTree(node);
            } else {
              diag.startTransaction("expand subtree");
              // collapse everything down to two levels
              diag.findTreeRoots().each(function(r) { r.collapseTree(2); });
              // but then expand this particular node
              diag.commandHandler.expandTree(node);
              diag.commitTransaction("expand subtree");
            }
          }
        },
        . . .
3

I dont have a Root node, my tree is like this :

Is it then mandatory to have a Tree root to be able to use findTreeRoots() function ? is there any other way to collapse all the tree roots ?

EDIT : nevermind. it is working i had to remove the argument from collapseTree to make all the tree roots collapse.
Thanks !