2019年11月16日 星期六

[ django pyecharts ] 製作水果交易網站(四) - 定時增量更新圖表

承上一篇文章：

1.修訂index.html

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
<!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:1600px; height:800px;"></div>
    <script>
        var chart = echarts.init(document.getElementById('bar'), 'white', {renderer: 'canvas'});
        var old_data = [];
        $(
            function () {
                fetchData(chart);
                setInterval(fetchData, 2000);
            }
        );

        function fetchData() {
            $.ajax({
                type: "GET",
                url: "http://127.0.0.1:8000/index/bar",
                dataType: "json",
                success: function (result) {
                    var options = result.data;
                    chart.setOption(options);
                    old_data = chart.getOption().series[0].data;
                }
            });
        }

        function getDynamicData() {
            $.ajax({
                type: "GET",
                url: "http://127.0.0.1:8000/index/barUpdate",
                dataType: 'json',
                success: function (result) {
                    var options = result.data;
                    old_data.push([options.name, options.value]);
                    chart.setOption({
                        series: [{
                            data: old_data
                        }]
                    });
                }
            });
        }

    </script>
</body>
</html>

2.urls.py


 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
"""django_charts URL Configuration

The `urlpatterns` list routes URLs to views. For more information please see:
    https://docs.djangoproject.com/en/2.2/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 fruitsapp.views import ChartView, IndexView, ChartUpdateView

urlpatterns = [
    path('admin/', admin.site.urls),
    path('index/bar/', ChartView.as_view()),
    path('index/', IndexView.as_view()),
    path('index/barUpdate/', ChartUpdateView.as_view()),
]

3.views.py

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
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
from pyecharts.globals import ThemeType

# 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(init_opts=opts.InitOpts(theme=ThemeType.LIGHT))
        .add_xaxis(["椪柑", "蘋果 富士進口", "番石榴 珍珠芭", "香蕉", "木瓜 網室紅肉", "甜橙 柳橙", "火龍果 紅肉"])
        .add_yaxis("台北一", [randrange(20, 100) for _ in range(7)])
        .add_yaxis("台北二", [randrange(20, 100) for _ in range(7)])
        .set_global_opts(title_opts=opts.TitleOpts(title="平均價", subtitle="元"))
        .dump_options_with_quotes()
    )
    return c


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


cnt = 9


class ChartUpdateView(APIView):
    def get(self, request, *args, **kwargs):
        global cnt
        cnt = cnt + 1
        return JsonResponse({"name": cnt, "value": randrange(0, 100)})

class IndexView(APIView):
    def get(self, request, *args, **kwargs):
        return HttpResponse(content=open("./templates/index.html").read())

張貼者： 於
標籤： , ,

沒有留言:

張貼留言

訂閱： 張貼留言 (Atom)