python django listview form 组合使用记录

python django listview form 组合使用记录

一、 背景

在使用django的listview类快速建立表格，很方便。便没有理解如何同时使用FORM表单，实现查询功能。

二、官方文档

（一）views

from django.http import HttpResponseRedirect
from django.shortcuts import render
from django.views import View

from .forms import MyForm

class MyFormView(View):
    form_class = MyForm
    initial = {'key': 'value'}
    template_name = 'form_template.html'

    def get(self, request, *args, **kwargs):
        form = self.form_class(initial=self.initial)
        return render(request, self.template_name, {'form': form})

    def post(self, request, *args, **kwargs):
        form = self.form_class(request.POST)
        if form.is_valid():
            # <process form cleaned data>
            return HttpResponseRedirect('/success/')

        return render(request, self.template_name, {'form': form})

替代以前的

from django.http import HttpResponseRedirect
from django.shortcuts import render

from .forms import MyForm

def myview(request):
    if request.method == "POST":
        form = MyForm(request.POST)
        if form.is_valid():
            # <process form cleaned data>
            return HttpResponseRedirect('/success/')
    else:
        form = MyForm(initial={'key': 'value'})

    return render(request, 'form_template.html', {'form': form})

三、难点及解析

（一）要有get和post

不能只有一个，要两个函数都有。

（二）在get和post的函数中，要调用查询，才能出现结果。

（三）引用form时，要使用form_class

views文件

class Listview(ListView):
    template_name = 't/listview.html'
    form_class = forms.Tform
    initial = {
        'name':'b'
    }
    paginate_by = 20
    extra_context = {
        'title':'T0',
        'pagination_url':'t:listview',
        'nanme':'a',
                     }
    def get_queryset(self):
        return models.T.objects.all()
        
    def get(self,request, *args, **kwargs):
        form = self.form_class(initial=self.initial)
        object_list=self.get_queryset()
        return render(request,self.template_name,{'form':form,'object_list':object_list})
    
    def post(self, request, *args, **kwargs):
        form = self.form_class(request.POST)
        if form.is_valid():
            n_str = form.cleaned_data['name']
            object_list = models.T.objects.filter(Q(T01__name__icontains=n_str)|Q(t0__name__icontains=n_str)|Q(name__icontains=n_str))
            return render(request, self.template_name, {'form': form,'object_list':object_list})
        return render(request, self.template_name, {'form': form})

html文件

    <form action="" method="post">
        {{form.as_p}}
        <input type="submit" value="查询">

    </form>

form文件

class Tform(forms.Form):
    name = forms.CharField(label='名称')