Flask系列(五)Flask实现分页
一、flask分页组件
from urllib.parse import urlencode,quote,unquote class Pagination(object): """ 自定义分页 """ def __init__(self,current_page,total_count,base_url,params,per_page_count=10,max_pager_count=11): try: current_page = int(current_page) except Exception as e: current_page = 1 if current_page <=0: current_page = 1 self.current_page = current_page # 数据总条数 self.total_count = total_count # 每页显示10条数据 self.per_page_count = per_page_count # 页面上应该显示的最大页码 max_page_num, div = divmod(total_count, per_page_count) if div: max_page_num += 1 self.max_page_num = max_page_num # 页面上默认显示11个页码（当前页在中间） self.max_pager_count = max_pager_count self.half_max_pager_count = int((max_pager_count - 1) / 2) # URL前缀 self.base_url = base_url # request.GET import copy params = copy.deepcopy(params) # params._mutable = True get_dict = params.to_dict() # 包含当前列表页面所有的搜/索条件 # {source:[2,], status:[2], gender:[2],consultant:[1],page:[1]} # self.params[page] = 8 # self.params.urlencode() # source=2&status=2&gender=2&consultant=1&page=8 # href="/hosts/?source=2&status=2&gender=2&consultant=1&page=8" # href="%s?%s" %(self.base_url,self.params.urlencode()) self.params = get_dict @property def start(self): return (self.current_page - 1) * self.per_page_count @property def end(self): return self.current_page * self.per_page_count def page_html(self): # 如果总页数 <= 11 if self.max_page_num <= self.max_pager_count: pager_start = 1 pager_end = self.max_page_num # 如果总页数 > 11 else: # 如果当前页 <= 5 if self.current_page <= self.half_max_pager_count: pager_start = 1 pager_end = self.max_pager_count else: # 当前页 + 5 > 总页码 if (self.current_page + self.half_max_pager_count) > self.max_page_num: pager_end = self.max_page_num pager_start = self.max_page_num - self.max_pager_count + 1 #倒这数11个 else: pager_start = self.current_page - self.half_max_pager_count pager_end = self.current_page + self.half_max_pager_count page_html_list = [] # {source:[2,], status:[2], gender:[2],consultant:[1],page:[1]} # 首页 self.params['page'] = 1 first_page = '<li><a href="%s?%s">首页</a></li>' % (self.base_url,urlencode(self.params),) page_html_list.append(first_page) # 上一页 self.params["page"] = self.current_page - 1 if self.params["page"] < 1: pervious_page = '<li class="disabled"><a href="%s?%s" aria-label="Previous">上一页</span></a></li>' % (self.base_url, urlencode(self.params)) else: pervious_page = '<li><a href = "%s?%s" aria-label = "Previous" >上一页</span></a></li>' % ( self.base_url, urlencode(self.params)) page_html_list.append(pervious_page) # 中间页码 for i in range(pager_start, pager_end + 1): self.params['page'] = i if i == self.current_page: temp = '<li class="active"><a href="%s?%s">%s</a></li>' % (self.base_url,urlencode(self.params), i,) else: temp = '<li><a href="%s?%s">%s</a></li>' % (self.base_url,urlencode(self.params), i,) page_html_list.append(temp) # 下一页 self.params["page"] = self.current_page + 1 if self.params["page"] > self.max_page_num: self.params["page"] = self.current_page next_page = '<li class="disabled"><a href = "%s?%s" aria-label = "Next">下一页</span></a></li >' % (self.base_url, urlencode(self.params)) else: next_page = '<li><a href = "%s?%s" aria-label = "Next">下一页</span></a></li>' % (self.base_url, urlencode(self.params)) page_html_list.append(next_page) # 尾页 self.params['page'] = self.max_page_num last_page = '<li><a href="%s?%s">尾页</a></li>' % (self.base_url, urlencode(self.params),) page_html_list.append(last_page) return ''.join(page_html_list)
二、使用组件
#!usr/bin/env python # -*- coding:utf-8 -*- from flask import Flask,render_template,request,redirect from pager import Pagination from urllib.parse import urlencode app = Flask(__name__) =========================django的用法======================================= # pager_obj = Pagination(request.GET.get('page', 1), len(HOST_LIST), request.path_info, request.GET) # host_list = HOST_LIST[pager_obj.start:pager_obj.end] # html = pager_obj.page_html() # return render(request, 'hosts.html', {'host_list': host_list, "page_html": html}) @app.route('/pager') def pager(): li = [] for i in range(1,100): li.append(i) # print(li) ===================================flask的用法=============================== pager_obj = Pagination(request.args.get("page",1),len(li),request.path,request.args,per_page_count=10) # print(request.args) index_list = li[pager_obj.start:pager_obj.end] html = pager_obj.page_html() return render_template("pager.html",index_list=index_list, html = html,condition=path) if __name__ == '__main__': app.run(debug=True)
pager.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width"> <title>Title</title> <link rel="stylesheet" href="/static/bootstrap-3.3.7-dist/css/bootstrap.min.css"> <style> .container{ margin-top: 20px; } </style> </head> <body> <div class="container"> <a href="/add?{{ condition }}"><button class="btn btn-primary">添加</button></a> <div class="row " style="margin-top: 10px"> <ul> {% for foo in index_list %} <li>{{ foo }}</li> {% endfor %} </ul> <nav aria-label="Page navigation" class="pull-right"> <ul class="pagination"> {{ html|safe }} </ul> </nav> </div> </div> </body> </html>
