crm 系統專案(三) 自動分頁
阿新 • • 發佈:2018-12-18
crm 系統專案(三) 自動分頁
需求:
1. 做一個自動分頁, 每15條資料1頁
2. 讓當前頁數在中間顯示
3. 上一頁, 下一頁
注意情況:
1.總頁數 小於 規定顯示的頁數
2. 左右兩邊極值情況
3. 前後端傳參,互動
user_list.py
{% extends 'layout.html' %} {% block content %} <table class="table table-bordered table-hover"> <thead> <tr> <th>序號</th> <th>使用者名稱</th> <th>密碼</th> </tr> </thead> <tbody> {urls.py% for user in all_user %} <tr> <td>{{ forloop.counter }}</td> <td>{{ user.name }}</td> <td>{{ user.pwd }}</td> </tr> {% endfor %} </tbody> </table> <nav aria-label="Page navigation"> <ul class="pagination"> {{ page_html|safe }} </ul> </nav> {% endblock %}
views.py
userlist= [{'name':'傻傻的兆滿{}號'.format(i),'pwd':'帥帥的灰灰{}號'.format(i)} for i in range(1,667)] def user_list(request): try: pageviews.py= int(request.GET.get('page', '1')) #獲取當前頁碼數 if page <= 0: page = 1 except Exception as e: page = 1 print(page) per_num = 15 # 每頁顯示的資料 all_count = len(userlist) #總的資料量 page_num, more = divmod(all_count, per_num) #商和餘數 if more: page_num += 1 max_show = 11 #最多顯示的分頁數 half_show = max_show // 2 #當前頁碼左面和右面各多少個, if page_num < max_show: page_start = 1 page_end = page_num else: if page <= half_show: page_start = 1 page_end = max_show elif page + half_show > page_num: page_start = page_num - max_show + 1 page_end = page_num else: page_start = page - half_show page_end = page + half_show start = (page - 1) * per_num end = page * per_num li_list = [] # 將分配好的頁碼,放入列表 if page == 1: li_list.append('<li class="disabled" ><a> << </a></li>') else: li_list.append('<li ><a href="?page={}"> << </a></li>'.format(page - 1)) for i in range(page_start, page_end + 1): if page == i: li_list.append('<li class="active"><a href="?page={}">{}</a></li>'.format(i, i)) else: li_list.append('<li><a href="?page={}">{}</a></li>'.format(i, i)) if page == page_num: li_list.append('<li class="disabled" ><a> >> </a></li>') else: li_list.append('<li ><a href="?page={}"> >> </a></li>'.format(page + 1)) page_html = ''.join(li_list) #列表變成字串 return render(request, 'user_list.html', {'all_user': userlist[start:end], 'page_num': range(page_start, page_end + 1), 'page_html': page_html},)
為了方便實用可以把整個分頁封裝起來,
在app下新建檔案 paginationg.py
封裝分頁功能
# 封裝分頁 class Pagination: def __init__(self, page, all_count, per_num=15, max_show=11): try: page = int(page) if page <= 0: page = 1 except Exception as e: page = 1 self.page = page self.all_count = all_count self.per_num = per_num self.max_show = max_show # 總頁碼數 self.page_num, more = divmod(all_count, per_num) if more: self.page_num += 1 # 最多顯示頁碼數 half_show = max_show // 2 if self.page_num < max_show: # 總頁碼數不夠 最大顯示頁碼數 self.page_start = 1 self.page_end = self.page_num else: # 能顯示超過最大顯示頁碼數 if page <= half_show: # 處理左邊的極值 self.page_start = 1 self.page_end = max_show elif page + half_show > self.page_num: # 處理右邊的極值 self.page_start = self.page_num - max_show + 1 self.page_end = self.page_num else: # 正常的情況 self.page_start = page - half_show self.page_end = page + half_show @property def start(self): return (self.page - 1) * self.per_num @property def end(self): return self.page * self.per_num @property def page_html(self): li_list = [] if self.page == 1: li_list.append('<li class="disabled" ><a> << </a></li>') else: li_list.append('<li ><a href="?page={}"> << </a></li>'.format(self.page - 1)) for i in range(self.page_start, self.page_end + 1): if self.page == i: li_list.append('<li class="active"><a href="?page={}">{}</a></li>'.format(i, i)) else: li_list.append('<li><a href="?page={}">{}</a></li>'.format(i, i)) if self.page == self.page_num: li_list.append('<li class="disabled" ><a> >> </a></li>') else: li_list.append('<li ><a href="?page={}"> >> </a></li>'.format(self.page + 1)) return ''.join(li_list)paginationg.py
viewa.py下直接傳參呼叫
# 呼叫封裝好的分頁 from app1.utils.paginationg import Pagination def user_list(request): pager = Pagination(request.GET.get('page','1'), len(user_list), per_num=10, max_show=15) return render(request, 'user_list.html', {"all_user": userlist[pager.start:pager.end], 'page_html': pager.page_html }, )View Code