title: How to create a Dynamic Flowing Sankey Diagram
body: <p>I am fairly new to D3 and wanted some wisdom on adapting a Sankey Diagram to indicate flow behaviour once a user clicks on a specific 'channel'. </p>
  
  <p>Current Sankey Diagrams reflect only a static view, as this Google Analytics example below: </p>
  
  <p><a href="https://i.stack.imgur.com/IBkte.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/IBkte.png" alt="GA Sankey"></a></p>
  
  <p>I envision the graph to allow a user to "High-light traffic through this node", but instead of only high-lighting, the user would also be able to see the data flowing, from start to end-points (from left to right). As a starting point, I added the flow over one of Mike Bostock's existing Sankey Charts, as a first prototype (source: <a href="http://bl.ocks.org/d3noob/5028304" rel="nofollow noreferrer">http://bl.ocks.org/d3noob/5028304</a>).</p>
  
  <p><a href="https://i.stack.imgur.com/SF2D2.gif" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SF2D2.gif" alt="&quot;Flowing&quot; Sankey Diagram Mockup"></a></p>
  
  <p>If possible, the prototype should also be extended to show drop-off flow in red (like the GA example above) at the node itself. Thanks! </p>