Django and ChartJS

Question

I\'m trying to understand if it it\'s possible to incorporate dynamic data into a Django Chart JS architecture. I went through a couple of tutorials and ultimately got Django t

Answer 1

You don't necessarily need to use serializers to render dynamic data in Chart.js (although you can if you would like). You can just iterate through your Django context variables like normal in the appropriate locations. Below is a line chart example. I would play around with this example, but this should show you how to easily render dynamic data with Django context variables.

...
<canvas id="funchart" width="75" height="50"></canvas>                      

<script type="text/javascript">  
     var a = document.getElementById('funchart').getContext('2d');
     var myLineChart = new Chart(a, {
               type: 'line',
               data: {
                   labels:[{% for i in myobject %}{{ i.labels }},{% endfor %}],
                   datasets: [{
                        label:'My Dot',
                        data: [{% for i in myobject %}{{ i.data }},{% endfor %}]
                             }]
                      },
               options:{
                   scales: {
                       xAxes: [{
                           display:true
                              }],
                       yAxes: [{
                           ticks: {
                               beginAtZero:true
                                   }
                               }]
                            }
                        }
                      });
</script>

Answer 2

My code below is what ultimately solved the problem on how to get dynamic user data. I am still trying to figure out how to get the labels to work properly. This solution allows the labels to display with ID numbers, which isn't optimal, but I opened a separate SO for the label issue.

My HTML

   {% extends 'base5.html' %}

{% block body_block %}
<div class="box6">
          <h1 class="title">Number of Books By Author</h1>
<canvas id="myChart"></canvas>
<div>

  <script>
  var endpoint = '{% url "Books:chart_data" %}'
  var defaultData = [];
  var labels = [];
  array = {{ procedures3 }}
  $.ajax({
      method: "GET",
      credentials: 'same-origin',
      url: endpoint,
      success: function(data){
          defaultData = data.default
          var ctx = document.getElementById("myChart");
          var myChart = new Chart(ctx, {
              type: 'bar',
              data: {
                  labels: [{% for i in book %}{{ i.id }},{% endfor %}],
                  datasets: [{
                      label: "# of Procedures",
                      data: [{% for j in book_count %}
                               {{ j }},
                             {% endfor %}],
                      backgroundColor: [
                          'rgba(255, 99, 132, 0.2)',
                          '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(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
                  }]
              }
          })
      },
      error: function(error_data){
          console.log("error")
          console.log(error_data)
      },
  })
  </script>
  {% endblock %}

Views.py

ChartView

class ChartData(LoginRequiredMixin,APIView):
    model = Author
    authentication_classes = (SessionAuthentication, BasicAuthentication)
    permission_classes = (IsAuthenticated,)

    def get(self, request, format=None):
        default_items = []
        labels = []
        data = {
            "labels": labels,
            "default": default_items,
        }
        return Response(data)

The ChartView

class ChartView(LoginRequiredMixin, TemplateView): template_name = 'Book/chart.html'

def get_context_data(self, **kwargs):
    context = super(ChartView, self).get_context_data(**kwargs)
    book = Author.objects.filter(id__in=self.request.user.userprofile.author.all()).order_by('id')
    books_count = [ Book.objects.filter(author=cls).count() for cls in book ]
    context['book'] = book
    context['book_count'] = books_count
    return context

Answer 3

so i have been working the same stuff here, i think your label not showing up because the label on chart.js only wants a string, so try this on your labels:

labels: [{% for i in book %}"{{ i.id }}",{% endfor %}]