Django自定义分页

admin

2024-12-18 2 0条评论

以下就介绍一下有关的分页代码在Django中的结构，和基本的使用含义。

1.1. 项目基本结构

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django _pagination ├── common │ └── util │ ├── pagination . py # 自己实现的分页代码 ├── db . sqlite3 ├── django _pagination │ ├── settings . py # 配置数据库和 app │ ├── urls . py # 配置转跳链接 │ ├── wsgi . py ├── manage . py ├── mysite │ ├── admin . py │ ├── __init__ . py │ ├── migrations │ ├── models . py # 关联数据库的model │ ├── templates │ │ ├── index . html # 显示分页的页面 │ ├── tests . py │ ├── views . py # 逻辑代码 ├── README . md └── sql └── mysite . sql # 数据库表结构和数据

1.2. 导入数据

1	mysql – uxxx – pyyy < sql / mysite . sql

1.3. 启动 server

1	python manage . py runserver 0.0.0.0 : 8000

1.4. 访问网页

1	http : //127.0.0.1:8000/mysite/index

效果图(没有使用CSS美化):

1.5. 看代码顺序

看 mysite/views.py 中的 index 方法

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from django . shortcuts import render ## 导入分页的模块 ## from common . util . pagination import Pagination # Create your views here. def index ( request ) : try : cur_page = int ( request . GET . get ( ‘cur_page’ , ‘1’ ) ) # 获取当前的页码 except ValueError : cur_page = 1 # 创建分页数据 pagination = Pagination . create_pagination ( from_name = ‘mysite.models’ , # 数据库对应Model的模块文件 model_name = ‘Employee’ , # 与数据库对应的Model cur_page = cur_page , # 传入当前的页码 start_page_omit_symbol = ‘…’ , # 页码(前)不够展示，使用什么符号表示 end_page_omit_symbol = ‘…’ , # 页码(后)不够展示，使用什么符号表示 one_page_data_size = 10 , # 每一页展示几条数据 show_page_item_len = 9 ) # 页码显示个数 return render ( request , ‘index.html’ , { ‘pagination’ : pagination } )

查看模板文件 mysite/templates/index.html

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< h1 > Employee List ( Pagination ) < / h1 > < li > emps : { { pagination . objs } } < / li > < table > < tr > < th > num < / th > < th > name < / th > < th > age < / th > < th > gender < / th > < / tr > { % for emp in pagination . objs % } < tr > < td > { { forloop . counter } } < / td > < td > { { emp . name } } < / td > < td > { { emp . age } } < / td > < td > { % if emp . gender == 1 % } 男 { % elif emp . gender == 2 % } 女 { % else % } 其他 { % endif % } < / td > < / tr > { % endfor % } < / table > < ! — 第一页 , 上一页 — > { % if pagination . cur_page != 1 % } < a href = “?cur_page=1” > & lt ; & lt ; < / a > < a href = “?cur_page={{ pagination.pre_page }}” > & lt ; < / a > { % endif % } < ! — 省略号 — > { { pagination . start_page_omit _symbol } } < ! — 能点击的页码 — > { % for page_item in pagination . page_items % } { % if page_item == pagination . cur_page % } { { page _item } } { % else % } < a href = “?cur_page={{ page_item }}” > { { page _item } } < / a > { % endif % } { % endfor % } < ! — 省略号 — > { { pagination . end_page_omit _symbol } } < ! — 下一页 , 最后一页 — > { % if pagination . cur_page != pagination . all_page % } < a href = “?cur_page={{ pagination.next_page }}” > & gt ; < / a > < a href = “?cur_page={{ pagination.all_page }}” > & gt ; & gt ; < / a > { % endif % }

最后看分页主逻辑 common/util/pagination.py

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class Pagination ( object ) : “” “用于Model字段值的选择” “” def __init__ ( self ) : pass @ classmethod def create_pagination ( self , from_name = ” , model_name = ” , cur_page = 1 , start_page_omit_symbol = ‘…’ , end_page_omit_symbol = ‘…’ , one_page_data_size = 10 , show_page_item_len = 9 ) : “” “通过给的model和分页参数对相关model进行分页 Args: from_name: 导入模块的 from后面的参数 from {from_name} import model_name mode_name: 需要导入的模块名 from from_name import {model_name} cur_page: 当前显示的是第几页 start_page_omit_symbol: 超出的页数使用怎么样的省略号(前) … 2 3 4 end_page_omit_symbol: 超出的页数使用怎么样的省略号(后) 1 2 3 4 … one_page_data_size: 每一页显示几行 show_page_item_len: 显示几个能点击的页数 Return: pagination: dict pagination = { ‘objs’: objs, # 需要显示model数据 ‘all_obj_counts’: all_obj_counts, # 一共多少行数据 ‘start_pos’: start_pos, # 数据分页开始的数据 ‘end_pos’: end_pos, # 数据分页结束的数据 ‘all_page’: all_page, # 一共有多少页 ‘cur_page’: cur_page, # 当前的页码 ‘pre_page’: pre_page, # 上一页的页码 ‘next_page’: next_page, # 下一页的页码 ‘page_items’: page_items, 能点击的页数 ‘start_page_omit_symbol’: start_page_omit_symbol, # 开始的省略号 ‘end_page_omit_symbol’: end_page_omit_symbol, # 结束的省略号 } Raise: None “ “” # 如果没有输入导入模块需要的相关信息直接退出 if not from_name or not model_name : return None import_str = ‘from {from_name} import {model_name}’ . format ( from_name = from_name , model_name = model_name ) # 导入模块 exec import_str start_pos = ( cur_page – 1 ) * one_page_data_size end_pos = start_pos + one_page_data_size # 查找需要的model数据 find_objs_str = ( ‘{model_name}.objects.all()’ ‘[{start_pos}:{end_pos}]’ . format ( model_name = model_name , start_pos = start_pos , end_pos = end_pos ) ) objs = eval ( find_objs_str ) # 计算总共的页数 find_objs_count_str = ‘{model_name}.objects.count()’ . format ( model_name = model_name ) all_obj_counts = eval ( find_objs_count_str ) all_page = all_obj_counts / one_page_data_size remain_obj = all_obj_counts % one_page_data_size if remain_obj > 0 : all_page += 1 # 限制当前页不能小于1和并且大于总页数 cur_page = 1 if cur_page < 1 else cur_page cur_page = all_page if cur_page > all_page else cur_page # 获得显示页数的最小页 start_page = cur_page – show_page_item_len / 2 if start_page > all_page – show_page_item_len : start_page = all_page – show_page_item_len + 1 start_page = 1 if start_page < 1 else start_page # 获得显示页数的最大页 end_page = cur_page + show_page_item_len / 2 end_page = all_page if end_page > all_page else end_page if end_page < show_page_item_len and all_page > show_page_item_len : end_page = show_page_item_len # 获得上一页 pre_page = cur_page – 1 pre_page = 1 if pre_page < 1 else pre_page # 获得下一页 next_page = cur_page + 1 next_page = all_page if next_page > all_page else next_page # 处理省略符，是否显示 if start_page <= 1 : start_page_omit_symbol = ” if end_page >= all_page : end_page_omit_symbol = ” # 创建能点击的展示页码 page_items = range ( start_page , end_page + 1 ) pagination = { ‘objs’ : objs , ‘all_obj_counts’ : all_obj_counts , ‘start_pos’ : start_pos , ‘end_pos’ : end_pos , ‘all_page’ : all_page , ‘cur_page’ : cur_page , ‘pre_page’ : pre_page , ‘next_page’ : next_page , ‘page_items’ : page_items , ‘start_page_omit_symbol’ : start_page_omit_symbol , ‘end_page_omit_symbol’ : end_page_omit_symbol , } return pagination