[bokeh] Django and Ajax

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1

Hi,

  here are codesnippest you should clue together to a working

AjaxDataSource with django:

  **app/views.py**

  from django.views import generic
  from django.http import JsonResponse

  from bokeh.plotting.figure import figure
  from bokeh.models.sources import AjaxDataSource
  from bokeh.models.markers import Circle
  from bokeh.embed import components

  class PlotView(generic.TemplateView):
      '''
     Static Bokeh Plot
      '''
   
      template_name = 'app/plot.html'

      def get_context_data(self, **kwargs):
          c = generic.TemplateView.get_context_data(self, **kwargs)
          plot = figure()
          data_url = str(reverse_lazy('app:plot_data'))
          source = AjaxDataSource(data=dict(timestamp=[], x=[],

y=, color=, alpha=, id=),
data_url=data_url,
polling_interval=4000,
method=‘GET’, mode=‘replace’)
circle = Circle(x=“x”, y=“y”, size=15, fill_color=“color”,
line_color=None)
plot.add_glyph(source, circle)
c[‘plot_js’], c[‘plot_div’] = components(plot)
return c

  class PlotDataView(generic.View):
      '''
     Deliver Json Data for the AjaxDataSource
      '''
      def get(self, request, *args, **kwargs):
          import random
          return JsonResponse(dict(x=[1,2,3],

y=[random.random(),random.random(),random.random()],
color=[‘blue’, ‘green’, ‘red’]))

  **app/urls.py
 ** from django.conf.urls import url

  from . import views

  urlpatterns = [     url(r'^plot/$', views.PlotView.as_view(), name='plot'),
      url(r'^plot_data/$', views.PlotDataView.as_view(),

name=‘plot_data’),
]

  **template/app/plot.html (make sure bokeh js and css is included)**

  {% block content %}

  <div class="row">
      <div class="col-lg-12">
          <h1 class="page-header">Pair Plot</h1>
      </div>
  </div>

    <div class="bk-root">
  {{ plot_div|safe }}

    </div>

  {{plot_js|safe }}

  {% endblock %}
···

On 2017-09-27 04:04, Allan wrote:

    Hey, so I'm testing out using AjaxDataSource to

load my data periodically. I’m working with Django and worked
off an example that was posted here some time ago. However, it
seems when I load my page, the polling_interval isn’t actually
being used, it just loads the data from the data url all at
once. I thought that it would grab a piece of data from the
huge list one at a time per the interval. Am I misunderstanding
something? How can I make it grab data as per a certain amount
and per time interval?

    Thanks!

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