一 Paginator分页器

1 首先在数据库中生成大量数据

def index(request)    book_list = []    for i in rang(1000)        book = Book(title="book_%s" %i, price=i*i)        book_list.append(book)    Book.objects.bulk_create(book_list)          # 批量插入数据

2 分页器中的主要方法

from django.core.paginator import Paginatorpaginator = Paginator(book_list,8)             # 每页展示几条内容print("count:",paginator.count)                # 总页数print("page_range",paginator.page_range)       # 页码的列表print("num_pages",paginator.num_pages)         # 总页数page1 = paginator.page(1)                      # 第1页的page对象for i in page1                                 # 遍历第1页的所有数据对象    print(i)                page2 = paginator.page(2)print(page2.hax_next())                        # 是否有下一页print(page2.next_page_number())                # 下一页页码print(page2.has_pervious())                    # 是否有上一页print(page2.pervious_page_number())            # 上一页的页码

3 实现页面分页

模板：

{% if current_page.has_previous %}                          先判断是否有上一页，如果没有就把'上一页'关闭     
                    «                
{
    % else %}      
                      «                
{
    % endif %}{
    % for item in page_range %}        {
    % if current_page_num == item %}                
{
   { item }}
        {
    % else %}                
{
   { item }}
        {
    % endif %}{
    % endfor %}{
    % if current_page.has_next %}        
                      »                   
{
    % endif %}

视图函数：

book_list = Book.objects.all()　　　　          # 获取全部数据paginator = Paginator(book_list, 10)　　　　　　 # 每页显示10条内容current_page_num = int(request.GET.get("page", 1))   # 当前在哪一页if paginator.num_pages > 11:       if current_page_num -5<1:             page_range = range(1,11)      elif current_page_num +5>paginator.num_pages:             page_range=range(paginator.num_pages-11, paginator.num _pages+1)      else:             page_range = range(current_page_num-5, current_page_num+6)else:       page_range = paginator.page_rangeprint("count:", paginator.count)print("num_pages:", paginator.num_pages)print("page_range:", page_range)for i in  page_range:     print(i)try:      current_page = paginator.page(current_page_num)   # 第一页的数据对象      print("object_list", current_page.object_list)except:      current_page = paginator.page(1)return render(request, 'index.html',locals())

二 自定义分页

1 直接在函数中实现分页

 

def get_data(req):   if req.metho == 'GET':        current_page = request.GET.get('page',1)    # 获取用户传来的请求页面(相当于当前页面)，默认是1        current_page = int(current_page)          # 制造切片        start = (current_page - 1) * 10        end = current_page * 10            data = models.User.objects.all()[start:end]         # 一次取10条数据        # 总个数        total_count = models.Classes.objects.all().count()        # 用总个数和每页显示的个数相处，求商和余数，如果有余数总页码还需+1        v,a = divmod(total_count,10)  # 相当于总页数         if a != 0:            v+=1          # 生成页码       page_list = []       # 如果是第一页那么上一页的功能就取消       if current_page == 1:           page_list.append('上一页' %(current_page-1)       else:           page_list.append('上一页' %(current_page-1)          # 判断并生成page_range       if v <= 11:            pager_range_start =1            ager_range_end = v       else:           if current_page <6:              pager_range_start = 1              pager_range_end = 11 +1           else:              pager_range_start = current_page -5              pager_range_end = current_page +6              if pager_range_end > v:                  page_range_start = current_page - 10                  pager_range_end = v +1                                      for i in range(pager_range_star,pager_range_end)              if i == current_page:                  page_list.append('%s' %(i,i))              page_list.append('%s' %(i,i))                    # 如果当前页是最后一页那么下一页功能就取消         if current_page == v:             page_list.append('下一页' %(current_page+1)        else：            page_list.append('下一页' %(current_page+1)                     pager = "".join(pager_list)         return render(request,{
   'data':data,'str_page':pager})

2 将自定义的分页器封装成一个类

class PagerHandler：            def __inin__(self,total_count,current_page, base_url. per_page=10):                self.total_count = total_count                self.current_page = current_page                self.base_url = base_url                self.per_page = per_page                            def db_start(self):                return (self.current_page -1) * self.per_page                            def db_end(self):                return (self.current_page) * self.per_page                        def tootal_page(self):                v,a = divmod(total_count,10)  # 相当于总页数                 if a != 0:                    v+=1                return v            def pager_str(self):                                v = self.tootal_page()                # 生成页码                page_list = []                # 如果是第一页那么上一页的功能就取消                if self.current_page == 1:                    page_list.append('上一页' %(self.current_page-1)                else:                    page_list.append('上一页' %(self.base_url,self.current_page-1)                                # 判断并生成page_range                if v <= 11:                    pager_range_start =1                    pager_range_end = v                else:                    if current_page <6:                        pager_range_start = 1                        pager_range_end = 11 +1                    else:                        pager_range_start = self.current_page -5                        pager_range_end = self.current_page +6                        if pager_range_end > v:                            page_range_start = self.current_page - 10                            pager_range_end = v +1                for i in range(pager_range_star,pager_range_end)                    if i == self.current_page:                        page_list.append('%s' %(self.base_url,i,i))                    page_list.append('%s' %(self.base_url,i,i))                                # 如果当前页是最后一页那么下一页功能就取消                if self.current_page == v:                    page_list.append('下一页' %(self.current_page+1)                else：                    page_list.append('下一页' %(self.base_url,self.current_page+1)                pager = "".join(pager_list)                return pager

3 在视图函数中调用

def index(request)    if request.method == 'GET':        current_page = request.GET.get('page',1)        current_page = int(current_page)        # 数据总数        total_count = models.Classes.objects.all().count()        page_obj = PagerHandler(total_count,current_page,'/index/')        pager = page_obj.pager_str()            data = models.Classes.objects.all()[page_obj.db_start():page_obj.db_end()] 　　　　 return render(request,'index.html',{'data':data,'pager':pager})

 4 也页面中保留过滤条件班分页组件

class Pagination:    def __init__(self, data_num, current_page, params,  url_prefix,  per_page=10, max_show=11):        """        进行初始化.        :param data_num: 数据总数        :param current_page: 当前页        :param url_prefix: 生成的页码的链接前缀        :param per_page: 每页显示多少条数据        :param max_show: 页面最多显示多少个页码        """        self.data_num = data_num        self.per_page = per_page        self.max_show = max_show        self.url_prefix = url_prefix        # 把页码数算出来        self.page_num, more = divmod(data_num, per_page)        if more:            self.page_num += 1        try:            self.current_page = int(current_page)        except Exception as e:            self.current_page = 1            # 如果URL传过来的页码数是负数        if self.current_page <= 0:            self.current_page = 1            # 如果URL传过来的页码数超过了最大页码数        elif self.current_page > self.page_num:            self.current_page = self.page_num  # 默认展示最后一页        # 页码数的一半 算出来        self.half_show = self.max_show // 2        # 如果数据总页码self.page_num<11 pager_page_count        if self.page_num <= self.max_show:            self.page_start = 1            self.page_end = self.page_num        else:            # 数据页码已经超过11            # 判断： 如果当前页 <= 5 self.half_show            if self.current_page <= self.half_show:                self.page_start = 1                self.page_end = self.max_show            else:                # 如果： 当前页+5 > 总页码                if (self.current_page + self.half_show) > self.page_num:                    self.page_start = self.page_num - self.max_show + 1                    self.page_end = self.page_num                else:                    self.page_start = self.current_page - self.half_show                    self.page_end = self.current_page + self.half_show        import copy        self.params = params # {"page":"12","title_startwith":"py","id__gt":"5"}    @property    def start(self):        # 数据从哪儿开始切        return (self.current_page - 1) * self.per_page    @property    def end(self):        # 数据切片切到哪儿        return self.current_page * self.per_page    def page_html(self):        # 生成页码        l = []        # 加一个首页        first_page = self.params        first_page['page'] = 1        l.append('
首页
'.format(self.url_prefix, first_page.urlencode()))        # 加一个上一页        if self.current_page == 1:            l.append('
«
'.format(self.current_page))        else:            self.params['page'] = self.current_page - 1            l.append('
«
'.format(self.url_prefix, self.params.urlencode()))        for i in range(self.page_start, self.page_end + 1):            self.params['page'] = i            if i == self.current_page:                tmp = '
{}
'.format(self.url_prefix, self.params.urlencode(), i)            else:                tmp = '
{}
'.format(self.url_prefix, self.params.urlencode(), i)            l.append(tmp)        # 加一个下一页        if self.current_page == self.page_num:            l.append('
»
'.format(self.current_page))        else:            self.params['page'] = self.current_page + 1            l.append('
»
'.format(self.url_prefix, self.params.urlencode()))        # 加一个尾页        last_page = self.params        last_page['page'] = self.page_num        l.append('
尾页
'.format(self.url_prefix, last_page.urlencode()))        return "".join(l)