title: How can I add dataset toggle to Chart.js?
body: <p><strong>GOAL:</strong>    Clicking on <code>chart</code> <code>legend</code> I want to show/hide corresponding line.
               I am using <em>Chart.legend.js</em> to create <code>legend</code>. I know <a href="https://stackoverflow.com/questions/30026156/how-to-add-a-dataset-toggle-to-chart-js">How to add a dataset toggle to Chart.js?</a> asked the same question <strong>but</strong> I cannot use jQuery.</p>
  
  <p>Any idea?</p>
  
  <p>Thank you</p>