Question

我正在尝试使用 jchart 模块在Django中创建一个图表，并且能够使用变量 hosp 从数据库中选择要从数据库中检索的行我的 views.py 到 HomeTotalStudies（）（下方）

views.py

from charts.chartsclass import HomeTotalStudies

def home(request):

    hosp = request.user.userprofile.hospital
    chart = HomeTotalStudies()
    return render .....

这是 /charts/chartsclass.py

from jchart import Chart
from jchart.config import (DataSet, Axes, rgba, ScaleLabel, Tick, Tooltips,
                           Legend, LegendLabel, Title, Hover, InteractionModes,
                           ElementLine, ElementPoint, ElementRectangle)

class HomeTotalStudies(Chart):

    chart_type = 'pie'
    responsive = False


    def get_labels(self,**kwargs):
        return ["CT","MG","RF","DX"]

    def get_datasets(self,**kwargs):
        modality = ['CT','MG','RF','DX']
        count = []
        if hosp=='somestring' #this is the variable i want to get from the views.py
            studies = GeneralStudyModel.objects.all()
        else:
            studies = GeneralStudyModel.objects.filter(equipmentattributes__institution_name__exact=hosp)

        for mod in modality:
            cc = studies.objects.filter(modality_type__exact=mod).count()
            count.append(cc)
        data = [count[i] for i in range(len(count))]
        colors = [
            rgba(255,99,132,1),
            rgba(54,162,235,1),
            rgba(255,159,64,1),
            rgba(255,206,86,1)
        ]
        return [DataSet(label="My DataSet",
                        data=data,
                        borderWidth=1,
                        backgroundColor=colors,
                        borderColor=colors)]

所以，我的问题是，如何将这个变量 hosp 从视图传递给图表类，以便我可以查询db表GeneralStudyModel并且只检索所需的行？

任何人都有任何建议/想法/解决方案吗？

由于

Answer 1

是的。

你有两个可能性：

困难的方法：你做一个返回数组的AJAX调用，然后用JavaScript填充它。这意味着要创建一个返回JSON数组的JSON视图
简单方法：您需要使用class-based-view来制作现代应用程序，并在您的班级中覆盖方法get_context_data()

像这样：

class GeneralStudyResultsView(generic.TemplateView):

    template_name='general_study_results.html'

    def get_context_data(self, **kwargs):
        # Call the base implementation first to get a context
        context = super(GeneralStudyResultsView, self).get_context_data(**kwargs)
        # Create a variable you fill
        context['my_big_sql'] = GeneralStudyModel.objects.all()
        return context

从那里开始，在您的模板文件中（这是您的模板文件，而不是JavaScript文件）general_study_results.html添加如下内容：

<script>
var myData = 
{% for row in my_big_sql %} 
    {{ row.column }}{% if not forloop.last %},{% endif %}
{% endfor %};
</script>

然后，由于charts.js

，您已准备好显示HTML文件中的所有数据

Answer 2

只需向图表类添加一个合适的初始化器，如下所示：

class HomeTotalStudies(Chart):

    def __init__(self, hosp, *args, **kwargs):
        self.hosp = hosp
        super().__init__(*args, **kwargs)

    def get_datasets(self,**kwargs):
        modality = ['CT','MG','RF','DX']
        count = []
        if self.hosp=='somestring' #this is the variable i want to get from the views.py
            studies = GeneralStudyModel.objects.all()
        else:
            studies = GeneralStudyModel.objects.filter(equipmentattributes__institution_name__exact=self.hosp)
    ...

然后在您看来：

from charts.chartsclass import HomeTotalStudies

def home(request):

    hosp = request.user.userprofile.hospital
    chart = HomeTotalStudies(hosp='whatever')
    return render .....

如何将参数放在jchart.Chart类中

2 个答案: