Add attributes to fix the charts

Author: Katrienvh

Resources/views/Tutorial/statistics.html.twig

@@ -9,38 +9,38 @@
   <h3>Line chart</h3>
   <div class="row">
     <div class="col-md-6 col-md-offset-3">
-      <canvas class="chart" id="line-chart"></canvas>
+      <canvas class="chart" id="line-chart" data-type="line-chart"></canvas>
     </div>
   </div>
 
   <h3>Bar chart</h3>
   <div class="row">
     <div class="col-md-6 col-md-offset-3">
-      <canvas class="chart" id="bar-chart"></canvas>
+      <canvas class="chart" id="bar-chart" data-type="bar-chart"></canvas>
     </div>
   </div>
 
   <h3>Radar chart</h3>
   <div class="row">
     <div class="col-md-6 col-md-offset-3">
-      <canvas class="chart" id="radar-chart"></canvas>
+      <canvas class="chart" id="radar-chart" data-type="radar-chart"></canvas>
     </div>
   </div>
 
   <h3>Polar area chart</h3>
   <div class="row">
     <div class="col-md-6 col-md-offset-3">
-     <canvas class="chart" id="polar-area-chart"></canvas>
+      <canvas class="chart" id="polar-area-chart" data-type="polar-area-chart"></canvas>
     </div>
   </div>
 
   <h3>Pie & Doughnut charts</h3>
   <div class="row">
-      <div class="col-md-6">
-          <canvas class="chart" id="pie-chart"></canvas>
-      </div>
-      <div class="col-md-6">
-          <canvas class="chart" id="doughnut-chart"></canvas>
-      </div>
+    <div class="col-md-6">
+      <canvas class="chart" id="pie-chart" data-type="pie-chart"></canvas>
+    </div>
+    <div class="col-md-6">
+      <canvas class="chart" id="doughnut-chart" data-type="doughnut-chart"></canvas>
+    </div>
   </div>
 {% endblock %}