title: how to know the current Zoom level in D3.js
body: <p>I have a problem since a few days. I have a graph and when I use <a href="https://github.com/mbostock/d3/wiki/Zoom-Behavior#wiki-zoom" rel="nofollow noreferrer">Zoom Behavior</a> it works, but I need to know when I reach maximum zoom to load new given</p>
  
  <pre><code>// Specifies the zoom scale's allowed range, [min, max]
  d3.behavior.zoom().x(x).scaleExtent([1,10]).on("zoom", draw)
  </code></pre>
  
  <p>See my code
  <a href="http://jsfiddle.net/albanlopez/D4MRP/" rel="nofollow noreferrer">http://jsfiddle.net/albanlopez/D4MRP/</a></p>