Django后端实现基于ajax的pyecharts动态加载

背景

后端：Django，前端：HTML，主要利用库pyecharts，然后实现前后端分离加载图表

参考官网文档的Django案例写下，参考网址：https://pyecharts.org/#/zh-cn/web_django

这里我重新创建一个Django项目

创建完项目如图

装pyecharts库

在terminal输入以下字符

pip3 install pyecharts

这里我已经装过了

测试一下是否正常

在terminal输入以下字符

python3 manage.py runserver

terminal

浏览器

新建一个app，名为adamBlog(建议别修改，跟我一样)

在terminal输入

python3 manage.py startapp adamBlog

在Django项目的settings.py文件中把app注册

项目的urls.py文件下增加以下内容

"""ajax_django_pyecharts URL Configuration

The `urlpatterns` list routes URLs to views. For more information please see:
    https://docs.djangoproject.com/en/3.0/topics/http/urls/
Examples:
Function views
    1. Add an import:  from my_app import views
    2. Add a URL to urlpatterns:  path('', views.home, name='home')
Class-based views
    1. Add an import:  from other_app.views import Home
    2. Add a URL to urlpatterns:  path('', Home.as_view(), name='home')
Including another URLconf
    1. Import the include() function: from django.urls import include, path
    2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
"""
from django.contrib import admin
from django.urls import path
from django.urls import re_path
from adamBlog import views
urlpatterns = [
    path('admin/', admin.site.urls),
    re_path(r'^my_first_home/$', views.home_page),
    re_path(r'^bar/$', views.ChartView.as_view()),
]

找到刚刚创建的app->views.py


输入以下内容

from django.shortcuts import render
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_demo() -> 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_with_quotes()
    )
    return c


class ChartView(APIView):
    def get(self, request, *args, **kwargs):
        return JsonResponse(json.loads(bar_demo()))


def home_page(request):
    return render(request,'my_home.html',{})

找到templates文件夹，如果没有创建一个(位置在项目的根目录)

在templates目录下创建一个html文件，名为my_home.html

内容如下

<html>
<head>
    <meta charset="UTF-8">
    <title>echarts-ajax</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/bar",
                dataType: 'json',
                success: function (result) {
                    chart.setOption(result.data);
                }
            });
        }
    </script>
</body>
</html>

至此就完成工作，我们再启动Django的服务。

在terminal输入以下字符

python3 manage.py runserver

进入网站 http://127.0.0.1:8000/my_first_home/ ，效果如下

posted @ 2020-06-06 22:03  Adam_lxd  阅读(1727)  评论(0)  编辑  收藏  举报