Django之分页器组件与自定义
Django之分页器组件一
class Pagination(object):
def __init__(self,current_page,all_count,per_page_num=2,pager_count=11):
"""
封装分页相关数据
:param current_page: 当前页
:param all_count: 数据库中的数据总条数
:param per_page_num: 每页显示的数据条数
:param pager_count: 最多显示的页码个数
用法:
queryset = model.objects.all()
page_obj = Pagination(current_page,all_count)
page_data = queryset[page_obj.start:page_obj.end]
获取数据用page_data而不再使用原始的queryset
获取前端分页样式用page_obj.page_html
"""
try:
current_page = int(current_page)
except Exception as e:
current_page = 1
if current_page <1:
current_page = 1
self.current_page = current_page
self.all_count = all_count
self.per_page_num = per_page_num
# 总页码
all_pager, tmp = divmod(all_count, per_page_num)
if tmp:
all_pager += 1
self.all_pager = all_pager
self.pager_count = pager_count
self.pager_count_half = int((pager_count - 1) / 2)
@property
def start(self):
return (self.current_page - 1) * self.per_page_num
@property
def end(self):
return self.current_page * self.per_page_num
def page_html(self):
# 如果总页码 < 11个：
if self.all_pager <= self.pager_count:
pager_start = 1
pager_end = self.all_pager + 1
# 总页码 > 11
else:
# 当前页如果<=页面上最多显示11/2个页码
if self.current_page <= self.pager_count_half:
pager_start = 1
pager_end = self.pager_count + 1
# 当前页大于5
else:
# 页码翻到最后
if (self.current_page + self.pager_count_half) > self.all_pager:
pager_end = self.all_pager + 1
pager_start = self.all_pager - self.pager_count + 1
else:
pager_start = self.current_page - self.pager_count_half
pager_end = self.current_page + self.pager_count_half + 1
page_html_list = []
# 添加前面的nav和ul标签
page_html_list.append('''
<nav aria-label='Page navigation>'
<ul class='pagination'>
''')
first_page = '<li><a href="?page=%s">首页</a></li>' % (1)
page_html_list.append(first_page)
if self.current_page <= 1:
prev_page = '<li class="disabled"><a href="#">上一页</a></li>'
else:
prev_page = '<li><a href="?page=%s">上一页</a></li>' % (self.current_page - 1,)
page_html_list.append(prev_page)
for i in range(pager_start, pager_end):
if i == self.current_page:
temp = '<li class="active"><a href="?page=%s">%s</a></li>' % (i, i,)
else:
temp = '<li><a href="?page=%s">%s</a></li>' % (i, i,)
page_html_list.append(temp)
if self.current_page >= self.all_pager:
next_page = '<li class="disabled"><a href="#">下一页</a></li>'
else:
next_page = '<li><a href="?page=%s">下一页</a></li>' % (self.current_page + 1,)
page_html_list.append(next_page)
last_page = '<li><a href="?page=%s">尾页</a></li>' % (self.all_pager,)
page_html_list.append(last_page)
# 尾部添加标签
page_html_list.append('''
</nav>
</ul>
''')
return ''.join(page_html_list)
分页器组件二
paging.py
-
from django.utils.safestring import mark_safe class Paging: def __init__(self, total_count, per_page_count, per_page_page, current_page, data=None): """ :param current_page: 当前页码 :param total_count: 总数据量 :param per_page_count: 每页显示多少条 :param per_page_page: 总共显示多少个页码 data: 可编辑Queryset对象 start_page_number:起始页码 end_page_number:结束页码 """ try: current_page = int(current_page) except Exception: current_page = 1 half_number = per_page_page // 2 a, b = divmod(total_count, per_page_count) # 如果余数不为0，页码总数为商+1 if b: total_page_count = a + 1 else: total_page_count = a # total_page_count 最大页数 # 当当前页码小于等于0的时候，默认显示第一页 if current_page >= total_page_count: current_page = total_page_count if current_page <= 0: current_page = 1 # current_page 2 # print(total_page_count) # 2 start_page_number = current_page - half_number # end_page_number = current_page + half_number + 1 # 6 if start_page_number <= 0: start_page_number = 1 end_page_number = per_page_page + 1 # 7 if end_page_number >= total_page_count: # 6 > 2 start_page_number = total_page_count - per_page_page + 1 # -4 end_page_number = total_page_count + 1 # 3 if total_page_count < per_page_page: start_page_number = 1 end_page_number = total_page_count + 1 self.current_page = current_page self.per_page_count = per_page_count self.total_page_count = total_page_count self.start_page_number = start_page_number self.end_page_number = end_page_number self.data = data @property def start_data_number(self): return (self.current_page - 1) * self.per_page_count @property def end_data_number(self): return self.current_page * self.per_page_count @property def paging_html(self): page_html = """ <nav aria-label="Page navigation"> <ul class="pagination"> """ self.data["page"] = 1 first_page = f""" <li> <a href="?{self.data.urlencode()}" aria-label="Previous"> <span aria-hidden="true">首页</span> </a> </li>""" page_html += first_page self.data['page'] = self.current_page - 1 previous_page = f""" <li> <a href="?{self.data.urlencode()}" aria-label="Previous"> <span aria-hidden="true">«</span> </a> </li>""" page_html += previous_page for i in range(self.start_page_number, self.end_page_number): self.data['page'] = i if i == self.current_page: page_html += f'<li class="active"><a href="?{self.data.urlencode()}">{i}</a></li>' else: page_html += f'<li><a href="?{self.data.urlencode()}">{i}</a></li>' self.data['page'] = self.current_page + 1 next_page = f""" <li> <a href="?{self.data.urlencode()}" aria-label="Next"> <span aria-hidden="true">»</span> </a> </li> """ page_html += next_page self.data['page'] = self.total_page_count last_page = f""" <li> <a href="?{self.data.urlencode()}" aria-label="Previous"> <span aria-hidden="true">尾页</span> </a> </li>""" page_html += last_page page_html += """ </ul> </nav> """ return mark_safe(page_html)
views
-
entry_obj = models.Enrollment.objects.all() page = request.GET.get("page") #当前页面 total_count = entry_obj.count() #总数据数 per_page_count = 10 #每页显示数据条数 per_page_page = 7 #每页页码显示 data = copy.copy(request.GET) #可编辑Queryset对象 page_obj = Paging(total_count, per_page_count, per_page_page, page, data) #实例化分页对象，参数是位置参数，一一对应 entry_obj=entry_obj[ page_obj.start_data_number:page_obj.end_data_number] #。。。。 page_html = page_obj.paging_html #生成分页HTML标签
bootstrap版分页器
class Pagination(object):
"""自定义分页（Bootstrap版）"""
def __init__(self, current_page, total_count, base_url, per_page=10, max_show=11):
"""
:param current_page: 当前请求的页码
:param total_count: 总数据量
:param base_url: 请求的URL
:param per_page: 每页显示的数据量，默认值为10
:param max_show: 页面上最多显示多少个页码，默认值为11
"""
try:
self.current_page = int(current_page)
except Exception as e:
# 取不到或者页码数不是数字都默认展示第1页
self.current_page = 1
# 定义每页显示多少条数据
self.per_page = per_page
# 计算出总页码数
total_page, more = divmod(total_count, per_page)
if more:
total_page += 1
self.total_page = total_page
# 定义页面上最多显示多少页码(为了左右对称，一般设为奇数)
self.max_show = max_show
self.half_show = max_show // 2
self.base_url = base_url
@property
def start(self):
return (self.current_page-1) * self.per_page
@property
def end(self):
return self.current_page * self.per_page
def page_html(self):
# 计算一下页面显示的页码范围
if self.total_page <= self.max_show: # 总页码数小于最大显示页码数
page_start = 1
page_end = self.total_page
elif self.current_page + self.half_show >= self.total_page: # 右边越界
page_end = self.total_page
page_start = self.total_page - self.max_show
elif self.current_page - self.half_show <= 1: # 左边越界
page_start = 1
page_end = self.max_show
else: # 正常页码区间
page_start = self.current_page - self.half_show
page_end = self.current_page + self.half_show
# 生成页面上显示的页码
page_html_list = []
page_html_list.append('<nav aria-label="Page navigation"><ul class="pagination">')
# 加首页
first_li = '<li><a href="{}?page=1">首页</a></li>'.format(self.base_url)
page_html_list.append(first_li)
# 加上一页
if self.current_page == 1:
prev_li = '<li><a href="#"><span aria-hidden="true">«</span></a></li>'
else:
prev_li = '<li><a href="{}?page={}"><span aria-hidden="true">«</span></a></li>'.format(
self.base_url, self.current_page - 1)
page_html_list.append(prev_li)
for i in range(page_start, page_end + 1):
if i == self.current_page:
li_tag = '<li class="active"><a href="{0}?page={1}">{1}</a></li>'.format(self.base_url, i)
else:
li_tag = '<li><a href="{0}?page={1}">{1}</a></li>'.format(self.base_url, i)
page_html_list.append(li_tag)
# 加下一页
if self.current_page == self.total_page:
next_li = '<li><a href="#"><span aria-hidden="true">»</span></a></li>'
else:
next_li = '<li><a href="{}?page={}"><span aria-hidden="true">»</span></a></li>'.format(
self.base_url, self.current_page + 1)
page_html_list.append(next_li)
# 加尾页
page_end_li = '<li><a href="{}?page={}">尾页</a></li>'.format(self.base_url, self.total_page)
page_html_list.append(page_end_li)
page_html_list.append('</ul></nav>')
return "".join(page_html_list)
使用示例
def publisher_list(request):
# 从URL中取当前访问的页码数
current_page = int(request.GET.get('page'))
# 比len(models.Publisher.objects.all())更高效
total_count = models.Publisher.objects.count()
page_obj = Pagination(current_page, total_count, request.path_info)
data = models.Publisher.objects.all()[page_obj.start:page_obj.end]
page_html = page_obj.page_html()
return render(request, "publisher_list.html", {"publisher_list": data, "page_html": page_html})
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