javascript - d3.js tree diagram - expand only next level nodes when clicking on root node -

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i have tree diagram i'm trying adapt here, problem automatically expands root nodes in tree when click on collapsed node, rather expanding immediate children. here's fiddle. how resolve this?

http://jsfiddle.net/heaversm/nw577/

the function handling toggling / collapsing of nodes:

function togglechildren(d) {     if (d.children) {         d._children = d.children;         d.children = null;     } else if (d._children) {         d.children = d._children;         d._children = null;     }     return d; }

the problem nodes start expanded , state of individual node toggled on click. is, nodes underneath root still expanded, not shown. click root node, are. not expanded root, never collapsed.

to fix, collapse nodes start with:

tree.nodes(root).foreach(function(n) { toggle(n); });

complete demo here.


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