title: Get Chart js object from selector
body: <p>After creating a chart like this (with <a href="http://www.chartjs.org/" rel="noreferrer">Chart.js</a>, latest version):</p>
  
  <pre><code>var ctx = $('#graph');
  var graph = new Chart(ctx, {
    type: 'line',
    data: someData, 
  });
  </code></pre>
  
  <p>I would like to retrieve the Chart object in another function in order to add some data point to it:</p>
  
  <pre><code>var graph = ???
  graph.data.labels.push(1)
  graph.data.datasets[0].data.push(10);
  </code></pre>
  
  <p>How do I get the Chart object?</p>
  
  <p>Thank you in advance!</p>