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详解Django的 page_kwarg() 函数:指定分页查询参数的名称

page_kwarg()是Django中一个用于分页的辅助函数。它的作用是获取Web请求中提供的Page参数,并将其加入到作为分页查询参数的字典中。我们可以通过这个函数来设置分页参数的默认值。

该函数的具体参数如下:

page_kwarg(page_query_param='page')

page_query_param:分页参数的名称,默认为“page”。

使用方法:

1.导入page_kwarg函数

from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger, page_kwarg

2.调用page_kwarg函数

def get(self,request:*HttpRequest, *args: Any, **kwargs: Any) -> Union[HttpResponse, Http404]:
   page = request.GET.get(page_kwarg)
   paginator = Paginator(queryset, 10)
   try:
      res = paginator.page(page)
   except PageNotAnInteger:
      res = paginator.page(1)
   except EmptyPage:
      res = paginator.page(paginator.num_pages)
   return render(request, 'blog/blog_list.html', {'blog_list': res})

实例1:博客列表

from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger, page_kwarg
class BlogListView(View):
   def get(self,request:*HttpRequest, *args: Any, **kwargs: Any) -> Union[HttpResponse, Http404]:
      blog_list = BlogModel.objects.all()
      page = request.GET.get(page_kwarg)
      paginator = Paginator(blog_list, 10)
      try:
         res = paginator.page(page)
      except PageNotAnInteger:
         res = paginator.page(1)
      except EmptyPage:
         res = paginator.page(paginator.num_pages)
      return render(request, 'blog/blog_list.html', {'blog_list': res})

实例2:图书列表

from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger, page_kwarg
class BookListView(View):
   def get(self,request:*HttpRequest, *args: Any, **kwargs: Any) -> Union[HttpResponse, Http404]:
      book_list = BookModel.objects.all()
      page = request.GET.get(page_kwarg)
      paginator = Paginator(book_list, 6)
      try:
         res = paginator.page(page)
      except PageNotAnInteger:
         res = paginator.page(1)
      except EmptyPage:
         res = paginator.page(paginator.num_pages)
      return render(request, 'book/book_list.html', {'book_list': res})

以上两个实例中,为了实现对列表数据的分页展示,我们需要先将数据集(如博客或图书)通过Django的Paginator类进行分页处理。page_kwarg()函数的作用在于,通过接收用户传入的Page参数并将其加入作为分页查询参数的字典中,实现分页功能的更加灵活和定制化。

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