How to use pyecharts in Django
Create a new directory for the project, name it Django \ _ pyecharts \ _ demo, change to this directory in the terminal, and create a virtual environment.
python -m venv django_pyecharts
Activate the virtual environment
django_pyecharts\Scripts\activate
To stop using the virtual environment, execute the command
deactivate
Once the virtual environment is created and activated, Django can be installed
(django_pyecharts)learning_log$ pip install Django pyecharts
Django is only available when the virtual environment is active. View installed python libraries, pip list.
(django_pyecharts) PS E:\python_work\Django\django_pyecharts> pip list
Package Version
------------------- -------
asgiref 3.8.1
Django 5.0.3
djangorestframework 3.15.1
Jinja2 3.1.3
MarkupSafe 2.1.5
pip 22.3
prettytable 3.10.0
pyecharts 2.0.5
setuptools 65.5.0
simplejson 3.19.2
sqlparse 0.4.4
tzdata 2024.1
wcwidth 0.2.13
Create a new project
django-admin startproject pyecharts_django_demo .
Don’t forget this period, or you’ll run into some configuration problems when you deploy your application. If you forget this period, delete the files and folders you created (except Django \ _ pyecharts) and rerun the command. Django stores most of the project-related information in a database, so you need to create a database for Django to use.
python manage.py migrate
Verify that Django created the project correctly. To do this, execute the command runserver.
python manage.py runserver
Show
Starting development server at http://127.0.0.1:8000/
Equivalent
http://localhost:8000/
To shut down the server, switch to the terminal window where you executed the runserver command and press Ctrl + C. If the error message That port is already in use appears, execute the command
python manage.py runserver 8001
Let Diango use another port. You should also have runserver running in the terminal window that you opened earlier. Open another terminal window (or tab) and change to the directory where the manage. Py is located. Activate that virtual environment,
django_pyecharts\Scripts\activate
Then execute the command start app:
python manage.py startapp demo
Register the application in the pyecharts \ _ Django \ _ demo/settings. Py.
# pyecharts_django_demo/settings.py
INSTALLED_APPS = [
'demo',
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
]
Edit the demo/URL s. Py films
# demo/urls.py
from django.urls import include
from django.urls import re_path as url
from . import views
urlpatterns = [
url(r'^$', views.index, name='index'),
]
Add a ‘demo. URLs’ in the pyecharts \ _ Django \ _ demo/URLs. Py.
from django.contrib import admin
from django.urls import path
from django.urls import include
from django.urls import re_path as url
urlpatterns = [
path('admin/', admin.site.urls),
url(r'^demo/', include('demo.urls'))
Step 1: Copy the pyecharts template. First, create a new templates folder under the demo folder, and copy the pyecharts template. Copy the pyecharts. Render. Templates to the newly created templates folder,
Step 2: Render the chart Save the following code to the demo/views. Py.
from jinja2 import Environment, FileSystemLoader
from pyecharts.globals import CurrentConfig
from django.http import HttpResponse
CurrentConfig.GLOBAL_ENV = Environment(loader=FileSystemLoader("./demo/templates"))
from pyecharts import options as opts
from pyecharts.charts import Bar
def index(request):
c = (
Bar()
.add_xaxis(["shirt", "cardigan", "Chiffon shirt", "Pants", "High heel", "sock"])
.add_yaxis("MerchantA", [5, 20, 36, 10, 75, 90])
.add_yaxis("MerchantB", [15, 25, 16, 55, 48, 8])
.set_global_opts(title_opts=opts.TitleOpts(title="Bar-basic example", subtitle="I am the subtitle"))
)
return HttpResponse(c.render_embed())
Step 3: Run the project
python manage.py runserver
Access the service by opening http://127.0.0.1:8000/demo it with a browser
Django Front End and Back End Separation Step 0: Create folders, virtual environments, etc. The previous steps are the same as above. Step 1: Create a new Django project
django-admin startproject pyecharts_django_demo .
python manage.py migrate
python manage.py startapp demo
Register the application in the pyecharts \ _ Django \ _ demo/settings. Py.
# pyecharts_django_demo/settings.py
INSTALLED_APPS = [
'demo', # <--- app name
'rest_framework',
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
]
Add a ‘demo. URLs’ in the pyecharts \ _ Django \ _ demo/URLs. Py.
# pyecharts_django_demo/urls.py
from django.contrib import admin
from django.urls import path
from django.urls import include
from django.urls import re_path as url
urlpatterns = [
path('admin/', admin.site.urls),
url(r'^demo/', include('demo.urls'))
]
Edit the demo/URL s. Py file (create one if none exist)
from django.urls import include
from django.urls import re_path as url
from . import views
urlpatterns = [
url(r'^bar/', views.ChartView.as_view(), name='demo'),
url(r'^index/', views.IndexView.as_view(), name='demo'),
]
Step 2 Write the drawing HTML code. First, create a new templates folder under the root directory folder, and create a new index. HTML.
(django_pyecharts) PS E:\python_work\Django\django_pyecharts_demo> ls
Table of contents: E:\python_work\Django\django_pyecharts_demo
Mode LastWriteTime Length Name
---- ------------- ------ ----
d----- 2024/3/24 14:08 demo
d----- 2024/3/24 9:43 django_pyecharts
d----- 2024/3/24 14:06 pyecharts_django_demo
d----- 2024/3/24 9:53 templates
-a---- 2024/3/24 9:45 131072 db.sqlite3
-a---- 2024/3/24 9:45 699 manage.py
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Awesome-pyecharts</title>
<script src="https://cdn.bootcss.com/jquery/3.0.0/jquery.min.js"></script>
<script type="text/javascript" src="https://assets.pyecharts.org/assets/echarts.min.js"></script>
</head>
<body>
<div id="bar" style="width:1000px; height:600px;"></div>
<script>
var chart = echarts.init(document.getElementById('bar'), 'white', {renderer: 'canvas'});
(
function () {
fetchData(chart);
}
);
function fetchData() {.ajax({
type: "GET",
url: "http://127.0.0.1:8000/demo/bar",
dataType: 'json',
success: function (result) {
chart.setOption(result.data);
}
});
}
</script>
</body>
</html>
Step 3: Write Django and pyecharts code to render the chart
Note: At present, due to the problem of JSON data type, the data of JSCode type in pyecharts cannot be converted into JSON data format and returned to the front-end page for use. Therefore, try to avoid using JSCode for drawing in the case of using front and back end separation.
Save the following code to the demo/views. Py.
from django.shortcuts import render
# Create your views here.
import json
from random import randrange
from django.http import HttpResponse
from rest_framework.views import APIView
from pyecharts.charts import Bar
from pyecharts import options as opts
# Create your views here.
def response_as_json(data):
json_str = json.dumps(data)
response = HttpResponse(
json_str,
content_type="application/json",
)
response["Access-Control-Allow-Origin"] = "*"
return response
def json_response(data, code=200):
data = {
"code": code,
"msg": "success",
"data": data,
}
return response_as_json(data)
def json_error(error_string="error", code=500, **kwargs):
data = {
"code": code,
"msg": error_string,
"data": {}
}
data.update(kwargs)
return response_as_json(data)
JsonResponse = json_response
JsonError = json_error
def bar_base() -> Bar:
c = (
Bar()
.add_xaxis(["shirt", "cardigan", "Chiffon shirt", "Pants", "High heel", "sock"])
.add_yaxis("MerchantA", [randrange(0, 100) for _ in range(6)])
.add_yaxis("MerchantB", [randrange(0, 100) for _ in range(6)])
.set_global_opts(title_opts=opts.TitleOpts(title="Bar-basic example", subtitle="I am the subtitle"))
.dump_options_with_quotes()
)
return c
class ChartView(APIView):
def get(self, request, *args, **kwargs):
return JsonResponse(json.loads(bar_base()))
class IndexView(APIView):
def get(self, request, *args, **kwargs):
return HttpResponse(content=open("./templates/index.html").read())
Step 4: Run the project
python manage.py runserver
Use a browser to open http://127.0.0.1:8000/demo/index to access the service.
