Pythonページング機能

ページングコンポーネントのカスタマイズ

"""
            ：
    pager_obj = Pagination(request.GET.get('page',1),len(HOST_LIST),request.path_info,request.GET)
    host_list = HOST_LIST[pager_obj.start:pager_obj.end]
    html = pager_obj.page_html()
    return render(request,'hosts.html',{'host_list':host_list,"page_html":html})
"""

class Pagination(object):
    """
         
    """
    def __init__(self,current_page,total_count,base_url,params,per_page_count=10,max_pager_count=11):
        try:
            current_page = int(current_page)
        except Exception as e:
            current_page = 1
        if current_page <=0:
            current_page = 1
        self.current_page = current_page
        #      
        self.total_count = total_count

        #     10   
        self.per_page_count = per_page_count

        #             
        max_page_num, div = divmod(total_count, per_page_count)
        if div:
            max_page_num += 1
        self.max_page_num = max_page_num

        #        11   （      ）
        self.max_pager_count = max_pager_count
        self.half_max_pager_count = int((max_pager_count - 1) / 2)

        # URL  
        self.base_url = base_url

        # request.GET
        import copy
        params = copy.deepcopy(params)
        params._mutable = True
        #                
        # {source:[2,], status:[2], gender:[2],consultant:[1],page:[1]}
        # self.params[page] = 8
        # self.params.urlencode()
        # source=2&status=2&gender=2&consultant=1&page=8
        # href="/hosts/?source=2&status=2&gender=2&consultant=1&page=8"
        # href="%s?%s" %(self.base_url,self.params.urlencode())
        self.params = params

    @property
    def start(self):
        return (self.current_page - 1) * self.per_page_count

    @property
    def end(self):
        return self.current_page * self.per_page_count

    def page_html(self):
        #       <= 11
        if self.max_page_num <= self.max_pager_count:
            pager_start = 1
            pager_end = self.max_page_num
        #       > 11
        else:
            #       <= 5
            if self.current_page <= self.half_max_pager_count:
                pager_start = 1
                pager_end = self.max_pager_count
            else:
                #     + 5 >    
                if (self.current_page + self.half_max_pager_count) > self.max_page_num:
                    pager_end = self.max_page_num
                    pager_start = self.max_page_num - self.max_pager_count + 1
                else:
                    pager_start = self.current_page - self.half_max_pager_count
                    pager_end = self.current_page + self.half_max_pager_count

        page_html_list = []
        # {source:[2,], status:[2], gender:[2],consultant:[1],page:[1]}
        self.params['page'] = 1
        first_page = 'トップページ' % (self.base_url,self.params.urlencode(),)
        page_html_list.append(first_page)
        #    

        for i in range(pager_start, pager_end + 1):
            self.params['page'] = i
            if i == self.current_page:
                temp = '%s' % (self.base_url,self.params.urlencode(), i,)
            else:
                temp = '%s' % (self.base_url,self.params.urlencode(), i,)
            page_html_list.append(temp)

        #    

        self.params['page'] = self.max_page_num
        last_page = '  ページ' % (self.base_url, self.params.urlencode(),)
        page_html_list.append(last_page)

        return ''.join(page_html_list)

    def bootstrap_page_html(self):
        #       <= 11
        if self.max_page_num <= self.max_pager_count:
            pager_start = 1
            pager_end = self.max_page_num
        #       > 11
        else:
            #       <= 5
            if self.current_page <= self.half_max_pager_count:
                pager_start = 1
                pager_end = self.max_pager_count
            else:
                #     + 5 >    
                if (self.current_page + self.half_max_pager_count) > self.max_page_num:
                    pager_end = self.max_page_num
                    pager_start = self.max_page_num - self.max_pager_count + 1
                else:
                    pager_start = self.current_page - self.half_max_pager_count
                    pager_end = self.current_page + self.half_max_pager_count

        page_html_list = []
        # {source:[2,], status:[2], gender:[2],consultant:[1],page:[1]}
        self.params['page'] = 1
        first_page = '
トップページ' % (self.base_url,self.params.urlencode(),)
        page_html_list.append(first_page)
        #    

        for i in range(pager_start, pager_end + 1):
            self.params['page'] = i
            if i == self.current_page:
                temp = '
%s' % (self.base_url,self.params.urlencode(), i,)
            else:
                temp = '
%s' % (self.base_url,self.params.urlencode(), i,)
            page_html_list.append(temp)

        #    

        self.params['page'] = self.max_page_num
        last_page = '
  ページ' % (self.base_url, self.params.urlencode(),)
        page_html_list.append(last_page)

        return ''.join(page_html_list)

2.使用

from utils.pager import Pagination

current_page = self.request.GET.get('page', 1)  #        ，         1
total_count = queryset.count()      #        
page_obj = Pagination(current_page, total_count, self.request.path_info, self.request.GET, per_page_count=10)
self.page_obj = page_obj     

self.data_list = queryset[page_obj.start:page_obj.end]

 
転載先:https://www.cnblogs.com/supery007/p/8184118.html