• django使用pyecharts(2)----django加入echarts_前后台分离



    二、Django 中使用 pyecharts。 前后端分离
    1、安装 djangorestframework
    linux pip3 install djangorestframework
    windows pip install djangorestframework
    2、新建一个 Django 项目
    $ django-admin startproject pyecharts_django_demo_2
    创建一个应用程序

    $ python manage.py startapp demo
    在 pyecharts_django_demo_2/settings.py 中注册应用程序

    # pyecharts_django_demo_2/settings.py
    INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'demo', # <--- app 名称
    'rest_framework',
    ]
    在 pyecharts_django_demo_2/urls.py 中新增 'demo.urls'

    from django.contrib import admin
    from django.urls import path
    from django.conf.urls import url, include

    urlpatterns = [
    path('admin/', admin.site.urls),
    url(r'^demo/', include('demo.urls')) #本行为新增内容
    ]
    编辑 demo/urls.py 文件(没有就新建一个)

    from django.conf.urls import url
    from . import views

    urlpatterns = [
    url(r'^bar/$', views.ChartView.as_view(), name='demo'),
    url(r'^index/$', views.IndexView.as_view(), name='demo'),
    ]
    3、 编写画图 HTML 代码
    先在根目录文件夹下新建 templates 文件夹,新建一个 index.html,目录结构为

    __pycache__ db.sqlite3 demo manage.py pyecharts_django_demo_2 templates
    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="1000px; height:600px;"></div>
    <script>
    var chart = echarts.init(document.getElementById('bar'), 'white', {renderer: 'canvas'});

    $(
    function () {
    getData(chart);
    }
    );

    function getData() {
    $.ajax({
    type: "GET",
    url: "http://127.0.0.1:8000/demo/bar",
    dataType: 'json',
    success: function (result) {
    chart.setOption(result.data);
    }
    });
    }
    </script>
    </body>
    </html>
    4: 编写 Django 和 pyecharts 代码渲染图表
    将下列代码保存到 demo/views.py 中

    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(["衬衫", "羊毛衫", "雪纺衫", "裤子", "高跟鞋", "袜子"])
    .add_yaxis("商家A", [randrange(0, 100) for _ in range(6)])
    .add_yaxis("商家B", [randrange(0, 100) for _ in range(6)])
    .set_global_opts(title_opts=opts.TitleOpts(title="Bar-基本示例", subtitle="我是副标题"))
    .dump_options()
    )
    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: 运行项目
    $ python manage.py runserver
    使用浏览器打开 http://127.0.0.1:8000/demo/index 即可访问服务
    http://127.0.0.1:8000/demo/bar返回json格式的数据

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  • 原文地址:https://www.cnblogs.com/programer-xinmu78/p/10924031.html
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