I have D3 Tree like this:
http://mbostock.github.io/d3/talk/20111018/tree.html
How can I add description i.e. ToolTip to each node so that if use hover any node the tooltip will be visible (assuming tooltip will come from json)?
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possible duplicate of [how to display name of node when mouse over on node in collapsible tree graph](http://stackoverflow.com/questions/19297808/how-to-display-name-of-node-when-mouse-over-on-node-in-collapsible-tree-graph) – Prerak Sola Feb 25 '15 at 15:46
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Also possible duplicate of http://stackoverflow.com/questions/10805184/d3-show-data-on-mouseover-of-circle/10806220#10806220 – Lars Kotthoff Feb 25 '15 at 18:41