Djangoでjqueryによるグラフ表示する方法

Djangoでjqueryによるグラフ表示する方法をご紹介します。
ここではChart.jsを使用した例を示します。

条件

  • Django 2.1.2
  • Python 3.7.0

urls.pyの設定

トップ画面に一覧画面を表示し、詳細画面にグラフを表示するという動作とします。

Plain text
Copy to clipboard
Open code in new window
EnlighterJS 3 Syntax Highlighter
from django.urls import path
from . import views
app_name = 'monitor'
urlpatterns = [
# トップ画面
path('', views.IndexView.as_view(), name='index'),
# 詳細画面
path('monitor/<int:pk>/', views.DetailView.as_view(), name='detail'),
]
from django.urls import path from . import views app_name = 'monitor' urlpatterns = [ # トップ画面 path('', views.IndexView.as_view(), name='index'), # 詳細画面 path('monitor/<int:pk>/', views.DetailView.as_view(), name='detail'), ]
from django.urls import path
from . import views
 
app_name = 'monitor'
 
urlpatterns = [
    # トップ画面
    path('', views.IndexView.as_view(), name='index'),
 
    # 詳細画面
    path('monitor/<int:pk>/', views.DetailView.as_view(), name='detail'),
]

views.pyの設定

get_context_dataを定義し、contextでviewにデータリストを渡すようにします。

Plain text
Copy to clipboard
Open code in new window
EnlighterJS 3 Syntax Highlighter
from django.http import HttpResponse
from django.views import generic
from .models import Location, Greenhouse
from django.contrib.auth.decorators import login_required
from django.contrib.auth.mixins import LoginRequiredMixin
import io
class IndexView(LoginRequiredMixin, generic.ListView):
model = Location
paginate_by = 5
ordering = ['-updated_at']
template_name = 'monitor/index.html'
class DetailView(generic.DetailView):
model = Location
template_name = 'monitor/detail.html'
def get_context_data(self, **kwargs):
context = super().get_context_data(**kwargs) # はじめに継承元のメソッドを呼び出す
# TODO: 本当はpkを基にしてモデルからデータを取得する。
data = [12, 19, 30, 50, 20, 30]
context['greenhouse_data_list'] = data
return context
from django.http import HttpResponse from django.views import generic from .models import Location, Greenhouse from django.contrib.auth.decorators import login_required from django.contrib.auth.mixins import LoginRequiredMixin import io class IndexView(LoginRequiredMixin, generic.ListView): model = Location paginate_by = 5 ordering = ['-updated_at'] template_name = 'monitor/index.html' class DetailView(generic.DetailView): model = Location template_name = 'monitor/detail.html' def get_context_data(self, **kwargs): context = super().get_context_data(**kwargs) # はじめに継承元のメソッドを呼び出す # TODO: 本当はpkを基にしてモデルからデータを取得する。 data = [12, 19, 30, 50, 20, 30] context['greenhouse_data_list'] = data return context
from django.http import HttpResponse
from django.views import generic
from .models import Location, Greenhouse
from django.contrib.auth.decorators import login_required
from django.contrib.auth.mixins import LoginRequiredMixin
import io

class IndexView(LoginRequiredMixin, generic.ListView): 
    model = Location 
    paginate_by = 5  
    ordering = ['-updated_at'] 
    template_name = 'monitor/index.html' 


class DetailView(generic.DetailView):
    model = Location
    template_name = 'monitor/detail.html'


    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)  # はじめに継承元のメソッドを呼び出す

        # TODO: 本当はpkを基にしてモデルからデータを取得する。
        data = [12, 19, 30, 50, 20, 30]
        context['greenhouse_data_list'] = data

        return context

detail.htmlの設定

data: {{ greenhouse_data_list }},でviewから渡されたデータリストをセットしています。

Plain text
Copy to clipboard
Open code in new window
EnlighterJS 3 Syntax Highlighter
{% extends 'base.html' %}
{% block content %}
<h1>{{ object.name }}</h1>
<section class="post-text">
{{ object.memo|linebreaksbr }}
</section>
<section class="post-date">
<p>Created:&nbsp;{{ object.created_at }}<span>/</span>Updated:&nbsp;{{ object.updated_at }}</p>
</section>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.3/Chart.bundle.min.js"></script>
<canvas id="myChart" style="width: 100%; height:300px;"></canvas>
<script type="text/javascript">
var chartChart = document.getElementById("myChart");
new Chart(chartChart, {
type: 'bar',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: {{ greenhouse_data_list }},
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
}
}]
}
}
});
</script>
<section>
<p><a href="javascript:history.back()">&lt; Back</a></p>
</section>
{% endblock %}
{% extends 'base.html' %} {% block content %} <h1>{{ object.name }}</h1> <section class="post-text"> {{ object.memo|linebreaksbr }} </section> <section class="post-date"> <p>Created:&nbsp;{{ object.created_at }}<span>/</span>Updated:&nbsp;{{ object.updated_at }}</p> </section> <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.3/Chart.bundle.min.js"></script> <canvas id="myChart" style="width: 100%; height:300px;"></canvas> <script type="text/javascript"> var chartChart = document.getElementById("myChart"); new Chart(chartChart, { type: 'bar', data: { labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"], datasets: [{ label: '# of Votes', data: {{ greenhouse_data_list }}, 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 } }] } } }); </script> <section> <p><a href="javascript:history.back()">&lt; Back</a></p> </section> {% endblock %}
{% extends 'base.html' %}

{% block content %}
<h1>{{ object.name }}</h1>
<section class="post-text">
    {{ object.memo|linebreaksbr }}
</section>
<section class="post-date">
    <p>Created:&nbsp;{{ object.created_at }}<span>/</span>Updated:&nbsp;{{ object.updated_at }}</p>
</section>

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.3/Chart.bundle.min.js"></script>
<canvas id="myChart" style="width: 100%; height:300px;"></canvas>
<script type="text/javascript">
    var chartChart = document.getElementById("myChart");
    new Chart(chartChart, {
        type: 'bar',
        data: {
            labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
            datasets: [{
                label: '# of Votes',
                data: {{ greenhouse_data_list }},
                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
                    }
                }]
            }
        }
    });
</script>

<section>
    <p><a href="javascript:history.back()">&lt; Back</a></p>
</section>
{% endblock %}

表示例

詳細画面を開くと、以下のように表示されます。

参考

Chart.jsの詳細は以下のサイトを参照してください。

http://www.chartjs.org/docs/latest/

コメントを残す

メールアドレスが公開されることはありません。 が付いている欄は必須項目です