一、分頁的實現與使用

class Pagination(object):
    """
    自定義分頁
    """
    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
        # 數據總條數
        self.total_count = total_count

        # 每頁顯示10條數據
        self.per_page_count = per_page_count

        # 頁面上應該顯示的最大頁碼
        max_page_num, div = divmod(total_count, per_page_count)
        if div:
            max_page_num += 1
        self.max_page_num = max_page_num

        # 頁面上默認顯示11個頁碼（當前頁在中間）
        self.max_pager_count = max_pager_count
        self.half_max_pager_count = int((max_pager_count - 1) / 2)

        # URL前綴
        self.base_url = base_url

        # request.GET
        import copy
        params = copy.deepcopy(params)
        params._mutable = True
        # 包含當前列表頁面所有的搜索條件
        # {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):
        # 如果總頁數 <= 11
        if self.max_page_num <= self.max_pager_count:
            pager_start = 1
            pager_end = self.max_page_num
        # 如果總頁數 > 11
        else:
            # 如果當前頁 <= 5
            if self.current_page <= self.half_max_pager_count:
                pager_start = 1
                pager_end = self.max_pager_count
            else:
                # 當前頁 + 5 > 總頁碼
                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   #倒這數11個
                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]}
        # 首頁
        self.params[‘page‘] = 1
        first_page = ‘<li><a href="%s?%s">首頁</a></li>‘ % (self.base_url,self.params.urlencode(),)
        page_html_list.append(first_page)

        # 上一頁
        self.params["page"] = self.current_page - 1
        if self.params["page"] < 1:
            pervious_page = ‘<li class="disabled"><a href="%s?%s" aria-label="Previous">上一頁</span></a></li>‘ % (
            self.base_url, self.params.urlencode())
        else:
            pervious_page = ‘<li><a href = "%s?%s" aria-label = "Previous" >上一頁</span></a></li>‘ % (
            self.base_url, self.params.urlencode())
        page_html_list.append(pervious_page)

        # 中間頁碼
        for i in range(pager_start, pager_end + 1):
            self.params[‘page‘] = i
            if i == self.current_page:
                temp = ‘<li class="active"><a href="%s?%s">%s</a></li>‘ % (self.base_url,self.params.urlencode(), i,)
            else:
                temp = ‘<li><a href="%s?%s">%s</a></li>‘ % (self.base_url,self.params.urlencode(), i,)
            page_html_list.append(temp)

        # 下一頁
        self.params["page"] = self.current_page + 1
        if self.params["page"] > self.max_page_num:
            self.params["page"] = self.current_page
            next_page = ‘<li class="disabled"><a href = "%s?%s" aria-label = "Next">下一頁</span></a></li >‘ % (
            self.base_url, self.params.urlencode())
        else:
            next_page = ‘<li><a href = "%s?%s" aria-label = "Next">下一頁</span></a></li>‘ % (
            self.base_url, self.params.urlencode())
        page_html_list.append(next_page)

        # 尾頁
        self.params[‘page‘] = self.max_page_num
        last_page = ‘<li><a href="%s?%s">尾頁</a></li>‘ % (self.base_url, self.params.urlencode(),)
        page_html_list.append(last_page)

        return ‘‘.join(page_html_list)

二、使用

"""
自定義分頁組件的使用方法：
    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})
"""

三、批量查數據

  #批量創建數據
    # booklist = []
    # for i in range(100):
    #     booklist.append(models.Book(name="book" + str(i), price=20 + i * i))
    #
    # models.Book.objects.bulk_create(booklist)

Django 【第九篇】自定義的分頁器組件