title: Uncaught TypeError: Cannot read property 'offsetWidth' of undefined - chart.js
body: <p>I have this simple html:</p>
  
  <pre><code>&lt;canvas id="myChart" width="400" height="400"&gt;&lt;/canvas&gt;
  </code></pre>
  
  <p>and this js:</p>
  
  <pre><code>var ctx = document.getElementById("myChart");
  
      var myChart = new Chart(ctx, {
          type: 'bar',
          data: {
              labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
              datasets: [{
                  label: '# of Votes',
                  data: [12, 19, 3, 5, 2, 3],
                  backgroundColor: [
                      'rgba(255, 99, 132, 0.2)',
                      'rgba(54, 162, 235, 0.2)',
                      'rgba(255, 206, 86, 0.2)',
                      'rgba(75, 192, 192, 0.2)',
                      'rgba(153, 102, 255, 0.2)',
                      'rgba(255, 159, 64, 0.2)'
                  ],
                  borderColor: [
                      'rgba(255,99,132,1)',
                      'rgba(54, 162, 235, 1)',
                      'rgba(255, 206, 86, 1)',
                      'rgba(75, 192, 192, 1)',
                      'rgba(153, 102, 255, 1)',
                      'rgba(255, 159, 64, 1)'
                  ],
                  borderWidth: 1
              }]
          },
          options: {
              scales: {
                  yAxes: [{
                      ticks: {
                          beginAtZero: true
                      }
                  }]
              }
          }
      });
  </code></pre>
  
  <p>Even though the canvas is configured with <code>myChart</code> id, I get the following error:</p>
  
  <pre><code>Uncaught TypeError: Cannot read property 'offsetWidth' of undefined
  </code></pre>
  
  <p>JSFiddle:
  <a href="https://jsfiddle.net/kroejrhx/" rel="noreferrer">https://jsfiddle.net/kroejrhx/</a></p>