Thanks walter , really appreciate your time and effort . I noticed that in your example , all nodes are expanded initially . But my requirement is not to expand nodes initially because of 200+ nodes . I just added { isTreeExpanded: false } condition in nodeTemplate to make all nodes collapse initially and then none of the nodes are getting expanded on click of button!!!. I debugged expandForm() function , isCollapsed and visible is getting changed but nodes are not getting expanded. Do we need to call cmd.expandTree() function ? Please help
function init() {
if (window.goSamples) goSamples(); // init for these samples – you don’t need to call this
var $ = go.GraphObject.make;
myDiagram =
$(go.Diagram, "myDiagramDiv",
{
padding: 10,
layout: $(go.LayeredDigraphLayout,
{ direction: 270, layeringOption: go.LayeredDigraphLayout.LayerLongestPathSource }),
//layout: $(go.TreeLayout,
// { angle: 270, arrangement: go.TreeLayout.ArrangementFixedRoots }),
"undoManager.isEnabled": true
});
myDiagram.nodeTemplate =
$(go.Node, go.Panel.Vertical,
{ portId: "", fromLinkable: true, toLinkable: true },
new go.Binding("visible"),
{ isTreeExpanded: false },
$(go.Panel, go.Panel.Auto,
$(go.Shape,
{ fill: "white", minSize: new go.Size(30, 30), strokeWidth: 0 },
{ cursor: "pointer" }, // indicate that linking may start here
new go.Binding("fill", "color")),
$(go.TextBlock,
{ margin: 2 },
{ fromLinkable: false, toLinkable: false }, // don't start drawing a link from the text
new go.Binding("text", "key"))),
$("Button", // a replacement for "TreeExpanderButton" that works for non-tree-structured graphs
// assume initially not visible because there are no links coming out
{ visible: false },
// bind the button visibility to whether it's not a leaf node
new go.Binding("visible", "isTreeLeaf",
function(leaf) { return !leaf; })
.ofObject(),
$(go.Shape,
{
name: "ButtonIcon",
figure: "MinusLine",
desiredSize: new go.Size(6, 6)
},
new go.Binding("figure", "isCollapsed", // data.isCollapsed remembers "collapsed" or "expanded"
function(collapsed) { return collapsed ? "PlusLine" : "MinusLine"; })),
{
click: function(e, obj) {
e.diagram.startTransaction();
var node = obj.part;
if (node.data.isCollapsed) {
expandFrom(node, node);
} else {
collapseFrom(node, node);
}
e.diagram.commitTransaction("toggled visibility of dependencies");
}
})
);
function collapseFrom(node, start) {
if (node.data.isCollapsed) return;
node.diagram.model.setDataProperty(node.data, "isCollapsed", true);
if (node !== start) node.diagram.model.setDataProperty(node.data, "visible", false);
node.findNodesOutOf().each(collapseFrom);
}
function expandFrom(node, start) {
console.log(node);
console.log(start);
if (!node.data.isCollapsed){
return;
}
node.diagram.model.setDataProperty(node.data, "isCollapsed", false);
if (node !== start){
node.diagram.model.setDataProperty(node.data, "visible", true);
}
//debugger;
node.findNodesOutOf().each(expandFrom);
}
myDiagram.linkTemplate =
$(go.Link,
{ routing: go.Link.AvoidsNodes },
$(go.Shape),
$(go.Shape, { toArrow: "Standard" }));
myDiagram.model = new go.GraphLinksModel([
{ key: "B", color: "gray", },
{ key: "C", color: "orange", },
{ key: "D0", color: "gray", },
{ key: "D1", color: "orange", },
{ key: "D2", color: "orange", },
{ key: "D3", color: "gray", },
], [
{ from: "B", to: "D0" },
{ from: "B", to: "D1" },
{ from: "D0", to: "C" },
{ from: "D1", to: "D2" },
{ from: "D2", to: "C" },
{ from: "C", to: "D2" },
{ from: "D0", to: "D3" }
]);
}