在Django开发过程中,遇到了需要图表进行数据可视化的需要。因此查询了相关文档,并记录下如何实现与图表的数据交互。 本人是个前端小白,只会改不会写(套模板)。
仅供参考!!!
环境相关
Django (版本不限,当然不同的版本有不同的后端代码写法。本文环境为Django 3.1)
echarts (前端的画图框架,导入JS包即可) 点击网址可以找到模板 网址
JQuery (用于Ajax请求 导入JS包即可 在文中会有JS包地址)
实现思路(需要理解的请结合代码来看)
- 后端方面主要涉及到了ajax,其实就是前端对后端请求一个特定的地址,后端收到请求后,将数据整理并打包成json格式向前端发送,有点类似于在写API接口。
- 前端方面。主要有两个点:echarts 和Ajax 。
- echarts 中可以看到,生成的模板里面有2个data项,用于储存数据信息制作表格。 (不同的图表有不同的数据点,本文只有2个data项,生成折线图)
- Ajax 用于向后端发送请求。
- 在编写过程中,先将echarts 表的数据项清空(data : [])。 后续通过ajax请求向后端请求数据包,并提取对应的数据加入到echarts 表的数据项中。
代码:
urls.py
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re_path( 'ajax_line/' , views.ajax_line, name = 'ajax_line' ), |
ajax请求接口:
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from django.db import models from datetime import datetime # Create your models here. class Shop(models.Model): Name = models.CharField(max_length = 50 , verbose_name = '名称' ) Barcode = models.CharField(max_length = 50 , verbose_name = '条形码' ,default = '') Money = models.IntegerField(default = 0 , verbose_name = '单价' ) number = models.IntegerField(default = 0 , verbose_name = '库存' ) Other = models.CharField(max_length = 100 , verbose_name = '备注' ,default = '无' ) objects = models.Manager() def __str__( self ): return self .Name class Meta: verbose_name = '商品' verbose_name_plural = verbose_name class ShopOrders(models.Model): Produce = models.ManyToManyField(Shop, verbose_name = '产品清单' , blank = True ) Money = models.IntegerField(default = 0 , verbose_name = '合计' ) add_time = models.DateTimeField(default = datetime.now, verbose_name = '时间' ) Other = models.CharField(max_length = 100 , verbose_name = '备注' , default = '无' ) Owner = models.CharField(max_length = 50 , verbose_name = '销售人员' ,default = '') FRESHMAN = 'FR' SOPHOMORE = 'SO' JUNIOR = 'JR' YEAR_IN_SCHOOL_CHOICES = ( (FRESHMAN, '微信' ), (SOPHOMORE, '现金' ), (JUNIOR, '支付宝' ), ) Type = models.CharField( max_length = 2 , choices = YEAR_IN_SCHOOL_CHOICES, default = FRESHMAN, ) objects = models.Manager() def __str__( self ): return self .Owner class Meta: verbose_name = '商品订单' verbose_name_plural = verbose_name |
models
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from django.db import models from datetime import datetime # Create your models here. class Shop(models.Model): Name = models.CharField(max_length = 50 , verbose_name = '名称' ) Barcode = models.CharField(max_length = 50 , verbose_name = '条形码' ,default = '') Money = models.IntegerField(default = 0 , verbose_name = '单价' ) number = models.IntegerField(default = 0 , verbose_name = '库存' ) Other = models.CharField(max_length = 100 , verbose_name = '备注' ,default = '无' ) objects = models.Manager() def __str__( self ): return self .Name class Meta: verbose_name = '商品' verbose_name_plural = verbose_name class ShopOrders(models.Model): Produce = models.ManyToManyField(Shop, verbose_name = '产品清单' , blank = True ) Money = models.IntegerField(default = 0 , verbose_name = '合计' ) add_time = models.DateTimeField(default = datetime.now, verbose_name = '时间' ) Other = models.CharField(max_length = 100 , verbose_name = '备注' , default = '无' ) Owner = models.CharField(max_length = 50 , verbose_name = '销售人员' ,default = '') FRESHMAN = 'FR' SOPHOMORE = 'SO' JUNIOR = 'JR' YEAR_IN_SCHOOL_CHOICES = ( (FRESHMAN, '微信' ), (SOPHOMORE, '现金' ), (JUNIOR, '支付宝' ), ) Type = models.CharField( max_length = 2 , choices = YEAR_IN_SCHOOL_CHOICES, default = FRESHMAN, ) objects = models.Manager() def __str__( self ): return self .Owner class Meta: verbose_name = '商品订单' verbose_name_plural = verbose_name |
前端
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<!-- THIS EXAMPLE WAS DOWNLOADED FROM https: //echarts.apache.org/examples/zh/editor.html?c=line-simple --> <!DOCTYPE html> <html lang= "zh-CN" style= "height: 100%" > <head> <meta charset= "utf-8" > </head> <body style= "height: 100%; margin: 0" > <h1 style= "Text-align:center" > 月度销售情况</h1>> <div id= "container" style= "height: 100%" ></div> <script type= "text/javascript" src= "https://fastly.jsdelivr.net/npm/echarts@5.3.3/dist/echarts.min.js" ></script> <script type= "text/javascript" charset= "utf8" src= "http://code.jquery.com/jquery-1.10.2.min.js" ></script> <script type= "text/javascript" > var dom = document.getElementById( 'container' ); var myChart = echarts.init(dom, null , { renderer: 'canvas' , useDirtyRect: false }); var app = {}; var option; option = { xAxis: { type: 'category' , data: [] }, yAxis: { type: 'value' }, series: [ { data: [], type: 'line' } ] }; if (option && typeof option === 'object' ) { myChart.setOption(option); } window.addEventListener( 'resize' , myChart.resize); myChart.showLoading(); var names = []; var brower = []; $.ajax({ // ajax的方式动态获取后端代码 type: 'get' , url: '/index/ajax_line/' , dataType: 'json' , success: function (result) { $.each(result.data, function (index, item) { names.push(item.name); brower.push({ value: item.count, name: item.name }); }); myChart.hideLoading(); myChart.setOption({ xAxis: { data: names }, series: [{ data: brower }] }); }, error: function (errormsg) { alert( 'errormsg' ); myChart.hideLoading(); } }); </script> </body> </html> |
成果展示
参考博客
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原文链接:https://blog.csdn.net/qq_42894605/article/details/125890909