Django组件之分页器
Django的分页器（paginator）
view
from django.shortcuts import render,HttpResponse
# Create your views here.
from app01.models import *
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger
def index(request):
'''
批量导入数据:
Booklist=[]
for i in range(100):
Booklist.append(Book(title="book"+str(i),price=30+i*i))
Book.objects.bulk_create(Booklist)
'''
'''
分页器的使用:
book_list=Book.objects.all()
paginator = Paginator(book_list, 10)
print("count:",paginator.count) #数据总数
print("num_pages",paginator.num_pages) #总页数
print("page_range",paginator.page_range) #页码的列表
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)
print(page1.object_list) #第1页的所有数据
page2=paginator.page(2)
print(page2.has_next()) #是否有下一页
print(page2.next_page_number()) #下一页的页码
print(page2.has_previous()) #是否有上一页
print(page2.previous_page_number()) #上一页的页码
# 抛错
#page=paginator.page(12) # error:EmptyPage
#page=paginator.page("z") # error:PageNotAnInteger
'''
book_list=Book.objects.all()
paginator = Paginator(book_list, 10)
page = request.GET.get('page',1)
currentPage=int(page)
try:
print(page)
book_list = paginator.page(page)
except PageNotAnInteger:
book_list = paginator.page(1)
except EmptyPage:
book_list = paginator.page(paginator.num_pages)
return render(request,"index.html",{"book_list":book_list,"paginator":paginator,"currentPage":currentPage})
index.html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css"
integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
</head>
<body>
<div class="container">
<h4>分页器</h4>
<ul>
{% for book in book_list %}
<li>{{ book.title }} -----{{ book.price }}</li>
{% endfor %}
</ul>
<ul class="pagination" id="pager">
{% if book_list.has_previous %}
<li class="previous"><a href="/index/?page={{ book_list.previous_page_number }}">上一页</a></li>
{% else %}
<li class="previous disabled"><a href="#">上一页</a></li>
{% endif %}
{% for num in paginator.page_range %}
{% if num == currentPage %}
<li class="item active"><a href="/index/?page={{ num }}">{{ num }}</a></li>
{% else %}
<li class="item"><a href="/index/?page={{ num }}">{{ num }}</a></li>
{% endif %}
{% endfor %}
{% if book_list.has_next %}
<li class="next"><a href="/index/?page={{ book_list.next_page_number }}">下一页</a></li>
{% else %}
<li class="next disabled"><a href="#">下一页</a></li>
{% endif %}
</ul>
</div>
</body>
</html>
自定义分页
page.py
""" 分页组件使用示例： obj = Pagination(request.GET.get('page',1),len(USER_LIST),request.path_info) page_user_list = USER_LIST[obj.start:obj.end] page_html = obj.page_html() return render(request,'index.html',{'users':page_user_list,'page_html':page_html}) """ class Pagination(object): def __init__(self,current_page_num,all_count,request,per_page_num=2,pager_count=11): """ 封装分页相关数据 :param current_page_num: 当前访问页的数字 :param all_count: 分页数据中的数据总条数 :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 """ try: current_page_num = int(current_page_num) except Exception as e: current_page_num = 1 if current_page_num <1: current_page_num = 1 self.current_page_num = current_page_num self.all_count = all_count self.per_page_num = per_page_num # 实际总页码 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) # 5 # 保存搜索条件 import copy self.params=copy.deepcopy(request.GET) # {"a":"1","b":"2"} @property def start(self): return (self.current_page_num - 1) * self.per_page_num @property def end(self): return self.current_page_num * 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_num <= 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_num + self.pager_count_half) > self.all_pager: pager_start = self.all_pager - self.pager_count + 1 pager_end = self.all_pager + 1 else: pager_start = self.current_page_num - self.pager_count_half pager_end = self.current_page_num + self.pager_count_half + 1 page_html_list = [] first_page = '<li><a href="?page=%s">首页</a></li>' % (1,) page_html_list.append(first_page) if self.current_page_num <= 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_num - 1,) page_html_list.append(prev_page) #self.params=copy.deepcopy(request.GET) # {"a":"1","b":"2"} for i in range(pager_start, pager_end): self.params["page"]=i if i == self.current_page_num: temp = '<li class="active"><a href="?%s">%s</a></li>' %(self.params.urlencode(),i) else: temp = '<li><a href="?%s">%s</a></li>' % (self.params.urlencode(),i,) page_html_list.append(temp) if self.current_page_num >= 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_num + 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) return ''.join(page_html_list)
视图函数
from django.shortcuts import render # Create your views here. from app01.models import Book from django.core.paginator import Paginator,EmptyPage def index(request): ''' 批量插入数据： # for i in range(100): # Book.objects.create(title="book_%s"%i,price=i*i) book_list=[] for i in range(100): book=Book(title="book_%s"%i,price=i*i) book_list.append(book) Book.objects.bulk_create(book_list) 分页器的使用： paginator=Paginator(book_list,8) print(paginator.count) # 100 print(paginator.num_pages) # 分页数：13 print(paginator.page_range) # range(1, 14) page=paginator.page(5) for i in page: print(i) print(page.has_next()) print(page.has_previous()) print(page.next_page_number()) print(page.previous_page_number()) book_list = Book.objects.all() paginator = Paginator(book_list, 2) try: current_page_num=request.GET.get("page",1) current_page=paginator.page(current_page_num) except EmptyPage as e: current_page_num=1 current_page = paginator.page(1) ''' # 自定义分页 print(request.GET) from app01.page import Pagination current_page_num = request.GET.get("page") book_list = Book.objects.all() pagination=Pagination(current_page_num,book_list.count(),request) ''' count=100 per_page=9 current_page_num=1 start 0 end 8 current_page_num=2 start 8 end 16 current_page_num=3 start 16 end 24 current_page_num=n start (n-1)*per_page end n*per_page ''' book_list=book_list[pagination.start:pagination.end] return render(request,"index.html",locals())
扩展
def index(request):
book_list=Book.objects.all()
paginator = Paginator(book_list, 15)
page = request.GET.get('page',1)
currentPage=int(page)
# 如果页数十分多时，换另外一种显示方式
if paginator.num_pages>11:
if currentPage-5<1:
pageRange=range(1,11)
elif currentPage+5>paginator.num_pages:
pageRange=range(currentPage-5,paginator.num_pages+1)
else:
pageRange=range(currentPage-5,currentPage+5)
else:
pageRange=paginator.page_range
try:
print(page)
book_list = paginator.page(page)
except PageNotAnInteger:
book_list = paginator.page(1)
except EmptyPage:
book_list = paginator.page(paginator.num_pages)
return render(request,"index.html",locals())
