Django組件-分頁器

時間  2019-12-09
標籤 django 組件 分頁 欄目 Python 简体版
原文   原文鏈接

Django分頁器

1、views.py

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#views.py
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):
     obj_list = Book.objects. all ()
     paginator = Paginator(obj_list, 9 )  # 每頁顯示行數
     try :
         current_page = int (request.GET.get( "page" ))  # 防止非數字
     except :
         current_page = 1
     #########################################################
 
     show_page = 11  #默認顯示頁數
     half = int ((show_page - 1 ) / 2 )
     all_pager = paginator.num_pages #總頁數
 
     # 若是數據總頁數 < 11
     if all_pager < show_page:
         begin = 1
         stop = all_pager + 1
     # 若是數據總頁數 > 11
     else :
         # 若是當前頁 <=5,永遠顯示1,11
         if current_page < = half:
             begin = 1
             stop = show_page + 1
         else :
             if current_page + half > all_pager:
                 begin = all_pager - show_page + 1
                 stop = all_pager + 1
             else :
                 begin = current_page - half
                 stop = current_page + half + 1
     page_range = range (begin,stop)
     #########################################################
     try :
         obj_list = paginator.page(current_page)
     except PageNotAnInteger:
         obj_list = paginator.page( 1 )
     except EmptyPage:
         obj_list = paginator.page(paginator.num_pages)
 
     # return render(request,"index.html",locals())
     return render(request, "index.html" , { "obj_list" : obj_list, "current_page" : current_page, "page_range" : page_range})
 
'''
批量導入數據:
     Booklist=[]
     for i in range(100):
         Booklist.append(Book(title="book"+str(i),price=30+i*i))
     Book.objects.bulk_create(Booklist)
分頁器的使用:
     obj_list=Book.objects.all()
     paginator = Paginator(obj_list, 10)     #每頁顯示10條
 
     print("count:",paginator.count)           #數據總數
     print("num_pages",paginator.num_pages)    #總頁數
     print("page_range",paginator.page_range)  #頁碼的列表
 
     page1=paginator.page(1) #第1頁的page對象
 
     #顯示某一頁具體數據的兩種方式：
     #方式1
     for i in page1:         #遍歷第1頁的全部數據對象
         print(i)
 
     #方式2
     print(page1.object_list) #第1頁的全部數據
 
     page2=paginator.page(2)
     print(page2.has_next())            #是否有下一頁
     print(page2.next_page_number())    #下一頁的頁碼
     print(page2.has_previous())        #是否有上一頁
     print(page2.previous_page_number()) #上一頁的頁碼
 
     #當前頁
     current_page=int(request.GET.get("page",1))
     obj_list=paginator.page(current_page)
     for i in obj_list:         #遍歷當前頁的全部數據對象
         print(i)
 
     # 拋錯
     #page=paginator.page(12)   # error:EmptyPage
     #page=paginator.page("z")   # error:PageNotAnInteger
 
'''

2、index.html

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<! 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 >分頁器</ h4 >
     < ul >
         {% for row in obj_list %}
              < li >{{ row.title }} -----{{ row.price }}</ li >
         {% endfor %}
      </ ul >
 
< nav aria-label="Page navigation">
     < ul class="pagination" id="pager">
                  {% if obj_list.has_previous %}
                     < li class="previous">< a href="?page={{ obj_list.previous_page_number }}">上一頁</ a ></ li >
                  {% else %}
                     < li class="previous disabled">< a href="">上一頁</ a ></ li >
                  {% endif %}
 
                  {% for num in page_range %}
                      {% if num == current_page %}
                        < li class="item active">< a href="?page={{ num }}">{{ num }}</ a ></ li >
                      {% else %}
                        < li class="item">< a href="?page={{ num }}">{{ num }}</ a ></ li >
                      {% endif %}
                  {% endfor %}
 
                  {% if obj_list.has_next %}
                     < li class="next">< a href="?page={{ obj_list.next_page_number }}">下一頁</ a ></ li >
                  {% else %}
                     < li class="next disabled">< a href="">下一頁</ a ></ li >
                  {% endif %}
      </ ul >
</ nav >
</ div >
 
</ body >
</ html >

自定義分頁

1、utils.pager.py

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class PageInfo( object ):
 
     def __init__( self ,current_page,all_count,per_page,base_url = '',show_page = 7 ):
         """
 
         :param current_page:
         :param all_count: 數據庫總行數
         :param per_page: 每頁顯示行數
         :return:
         """
         self .all_count = all_count
         try :
             self .current_page = int (current_page)
         except Exception as e:
             self .current_page = 1
         self .per_page = per_page
 
         a,b = divmod ( self .all_count,per_page)
         if b:
             a = a + 1
         self .all_pager = a
 
         self .show_page = show_page
         self .base_url = base_url
     def start( self ):
         return ( self .current_page - 1 ) * self .per_page
 
     def end( self ):
         return self .current_page * self .per_page
 
 
     def pager( self ):
         # v = "<a href='/custom.html?page=1'>1</a><a href='/custom.html?page=2'>2</a>"
         # return v
         page_list = []
 
         half = int (( self .show_page - 1 ) / 2 )
 
         # 若是數據總頁數 < 11
         if self .all_pager < self .show_page:
             begin = 1
             stop = self .all_pager + 1
         # 若是數據總頁數 > 11
         else :
             # 若是當前頁 <=5,永遠顯示1,11
             if self .current_page < = half:
                 begin = 1
                 stop = self .show_page + 1
             else :
                 if self .current_page + half > self .all_pager:
                     begin = self .all_pager - self .show_page + 1
                     stop = self .all_pager + 1
                 else :
                     begin = self .current_page - half
                     stop = self .current_page + half + 1
 
         first = "<li><a  href='%s?page=1'>首頁</a></li>" % ( self .base_url,)
         page_list.append(first)
 
         if self .current_page < = 1 :
             prev = "<li class='previous disabled'><a href=''>上一頁</a></li>"
         else :
             prev = "<li class='previous'><a href='%s?page=%s'>上一頁</a></li>" % ( self .base_url, self .current_page - 1 ,)
         page_list.append(prev)
 
         for i in range (begin,stop):
             if i = = self .current_page:
                 temp = "<li class='item active'><a  href='%s?page=%s'>%s</a></li>" % ( self .base_url,i,i,)
             else :
                 temp = "<li class='item'><a href='%s?page=%s'>%s</a></li>" % ( self .base_url,i,i,)
             page_list.append(temp)
 
         if self .current_page > = self .all_pager:
             nex = "<li class='next disabled'><a href='#'>下一頁</a></li>"
         else :
             nex = "<li class='next'><a href='%s?page=%s'>下一頁</a></li>" % ( self .base_url, self .current_page + 1 ,)
         page_list.append(nex)
 
         if self .all_pager > 0 :
             last = "<li><a href='%s?page=%s'>尾頁</a></li>" % ( self .base_url, self .all_pager)
         else :
             last = "<li><a href='%s?page=%s'>尾頁</a></li>" % ( self .base_url, 1 )
         page_list.append(last)
 
         total = "<li><span>共<b>%s</b>頁<b>%s</b>條數據</span></li>" % ( self .all_pager, self .all_count)
         page_list.append(total)
         return ''.join(page_list)

2、views.py

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#app01.views.py
from django.shortcuts import render, HttpResponse
from utils.pager import PageInfo
from app01.models import *
def index(request):
     # ==========begin 頁碼
     try :
         current_page = int (request.GET.get( "page" ))  # 防止非數字
     except :
         current_page = 1
     # base_url=request.path_info
     all_count = Book.objects. all ().count()
     page_info = PageInfo(current_page,all_count, 8 )
     obj_list = Book.objects. all ()[page_info.start():page_info.end()]
     # =========end 頁碼
     return render(request, 'index.html' ,{ 'obj_list' :obj_list, 'page_info' :page_info})

3、index.html

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<! 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 >自定義分頁</ h4 >
     < ul >
         {% for book in obj_list %}
              < li >{{ book.title }} -----{{ book.price }}</ li >
         {% endfor %}
      </ ul >
 
  < nav aria-label="Page navigation">
       < ul class="pagination">
           {{ page_info.pager|safe }}
       </ ul >
</ nav >
 
</ div >
</ body >
</ html >
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