title: setting the categories using ajax in highcharts
body: <p>trying to create a chart heatmap using <code>highcharts</code> library, i am using <code>blacklabel</code> plugin to set multilevel categories for x and y axis.</p>
  
  <p>here is the blacklabel demo link.</p>
  
  <pre><code>https://jsfiddle.net/BlackLabel/TFhd7/
  </code></pre>
  
  <p>if i hardcode the categories as per the demo, its working good, but i get the x axis categories, y axis categories and the data from the database. this is where i am facing issue.</p>
  
  <p>my server side coding is c# with asp.net, and i am posting all ajax calls to request all the data.</p>
  
  <p>can anyone help me with example how to set the multilevel categories dynamically with ajax call.</p>