[py]tornado分页实现-从本质到完全实现
来源：互联网 发布：calibre安卓软件 编辑：程序博客网 时间：2024/06/07 09:40
分页程序git代码
初始化tornado目录
构建项目–实现post提交,get展示数据
实现类似
代码逻辑
完整代码
start.py#!/usr/bin/env python# coding=utf-8import timeimport tornado.ioloopimport tornado.web# 业务逻辑处理模块# 配置选项模块from controllers import home# 静态文件和模板文件的配置settings = { 'template_path': 'templates', 'static_path': 'statics',}# 路由模块## 动态路由系统application = tornado.web.Application([ (r"/index/(?P<page>\d+)/(?P<nid>\d+)", home.IndexHandler),], **settings)## wsgi模块if __name__ == "__main__": application.listen(8888) tornado.ioloop.IOLoop.instance().start()controllers/home.py#!/usr/bin/env python# coding=utf-8import tornado.webLIST_INFO = [ {"username": "maotai", "email": "123456"},]class IndexHandler(tornado.web.RequestHandler): # def get(self, *args, **kwargs): def get(self,page,nid): # print(page,nid) self.render("home/index.html", list_info=LIST_INFO) def post(self, *args, **kwargs): username = self.get_argument("username", "") email = self.get_argument("email", "") tmp = {"username": username, "email": email} LIST_INFO.append(tmp) self.redirect("/index/1/1")home/index.html<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>index</title></head><body><h1>添加数据</h1><form action="/index/1/1" method="post"> <input type="text" name="username"> <input type="email" name="email"> <input type="submit" typeof="提交"></form><h1>显示数据</h1><table border="1"> <thead> <tr> <th>用户名</th> <th>邮箱</th> </tr> </thead> <tbody> {% for line in list_info %} <tr> <td>{{ line['username'] }}</td> <td>{{ line['email'] }}</td> </tr> {% end %} </tbody></table></body></html>实现url //
实现分页-每页显示5条数据
效果:
代码逻辑:
完整代码:
#!/usr/bin/env python# coding=utf-8import timeimport tornado.ioloopimport tornado.web# 业务逻辑处理模块# 配置选项模块from controllers import home# 静态文件和模板文件的配置settings = { 'template_path': 'templates', 'static_path': 'statics',}# 路由模块## 动态路由系统application = tornado.web.Application([ (r"/index/(?P<page>\d*)", home.IndexHandler),], **settings)## wsgi模块if __name__ == "__main__": application.listen(8888) tornado.ioloop.IOLoop.instance().start()#!/usr/bin/env python# coding=utf-8import tornado.webLIST_INFO = [ {"username": "maotai", "email": "123456"},]class IndexHandler(tornado.web.RequestHandler): # def get(self, *args, **kwargs): def get(self, page): # 每页显示5条数据 # LIST_INFO[0:5] # LIST_INFO[5:10] page = int(page) print(page) start = (page - 1) * 5 end = page * 5 current_list = LIST_INFO[start:end] self.render("home/index.html", list_info=current_list) def post(self, *args, **kwargs): username = self.get_argument("username", "") email = self.get_argument("email", "") tmp = {"username": username, "email": email} LIST_INFO.append(tmp) self.redirect("/index/1")<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>index</title></head><body><h1>添加数据</h1><form action="/index/1" method="post"> <input type="text" name="username"> <input type="email" name="email"> <input type="submit" typeof="提交"></form><h1>显示数据</h1><table border="1"> <thead> <tr> <th>用户名</th> <th>邮箱</th> </tr> </thead> <tbody> {% for line in list_info %} <tr> <td>{{ line['username'] }}</td> <td>{{ line['email'] }}</td> </tr> {% end %} </tbody></table></body></html>处理page异常
- page为空 如page=
- page转换int不成功, 如page=xfdsfd213
- page<=0情况
思路:
使用try except来操作
class IndexHandler(tornado.web.RequestHandler): # def get(self, *args, **kwargs): def get(self, page): # 每页显示5条数据 # LIST_INFO[0:5] # LIST_INFO[5:10] # c # if not page: # page = 1 try: page = int(page) except: page = 1 if page <= 0: page = 1 print(page) start = (page - 1) * 5 end = page * 5 current_list = LIST_INFO[start:end] self.render("home/index.html", list_info=current_list) def post(self, *args, **kwargs): username = self.get_argument("username", "") email = self.get_argument("email", "") tmp = {"username": username, "email": email} LIST_INFO.append(tmp) self.redirect("/index/1")实现提交数据后,不总是跳转到index/1,而是和get时候index/x一样
实现效果
代码逻辑
完整代码:
#!/usr/bin/env python# coding=utf-8import tornado.webLIST_INFO = [ {"username": "maotai", "email": "123456"},]class IndexHandler(tornado.web.RequestHandler): # def get(self, *args, **kwargs): def get(self, page): try: page = int(page) except: page = 1 if page <= 0: page = 1 print(page) start = (page - 1) * 5 end = page * 5 current_list = LIST_INFO[start:end] self.render("home/index.html", list_info=current_list,current_page=page) def post(self,page): username = self.get_argument("username", "") email = self.get_argument("email", "") tmp = {"username": username, "email": email} LIST_INFO.append(tmp) self.redirect("/index/"+page)#!/usr/bin/env python# coding=utf-8import timeimport tornado.ioloopimport tornado.web# 业务逻辑处理模块# 配置选项模块from controllers import home# 静态文件和模板文件的配置settings = { 'template_path': 'templates', 'static_path': 'statics',}# 路由模块## 动态路由系统application = tornado.web.Application([ (r"/index/(?P<page>\d*)", home.IndexHandler),], **settings)## wsgi模块if __name__ == "__main__": application.listen(8888) tornado.ioloop.IOLoop.instance().start()<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>index</title></head><body><h1>添加数据</h1><form action="/index/{{ current_page }}" method="post"> <input type="text" name="username"> <input type="email" name="email"> <input type="submit" typeof="提交"></form><h1>显示数据</h1><table border="1"> <thead> <tr> <th>用户名</th> <th>邮箱</th> </tr> </thead> <tbody> {% for line in list_info %} <tr> <td>{{ line['username'] }}</td> <td>{{ line['email'] }}</td> </tr> {% end %} </tbody></table></body></html>xss跨站
效果: 提交js代码.每刷新一次都会执行一次.
实现:让代码按照原格式执行,前面加raw
<tbody> {% for line in list_info %} <tr> <!--<td>{{ line['username'] }}</td>--> <td>{% raw line['username'] %}</td> <td>{{ line['email'] }}</td> </tr> {% end %} </tbody>初步实现点分页链接
效果:
核心代码
<table border="1"> <thead> <tr> <th>用户名</th> <th>邮箱</th> </tr> </thead> <tbody> {% for line in list_info %} <tr> <!--<td>{{ line['username'] }}</td>--> <td>{% raw line['username'] %}</td> <td>{{ line['email'] }}</td> </tr> {% end %} </tbody></table><div class = "pager"> <a href="/index/1">1</a> <a href="/index/2">2</a> <a href="/index/3">3</a></div>从后端传值过来
实现效果
def get(self, page): try: page = int(page) except: page = 1 if page <= 0: page = 1 start = (page - 1) * 5 end = page * 5 current_list = LIST_INFO[start:end] all_pager,c = divmod(len(LIST_INFO),5) if c>0: all_pager+=1 str_page = """ <a href="/index/1">1</a> <a href="/index/2">2</a> <a href="/index/3">3</a> <a href="/index/4">4</a> """ self.render("home/index.html", list_info=current_list,current_page=page,str_page=str_page)实现分页链接根据后端数据长度自动生成
效果图:
核心代码:
LIST_INFO = [ {"username": "maotai", "email": "123456"},]for line in range(300): tmp={"username": "maotai", "email": "123456"} LIST_INFO.append(tmp) def get(self, page): try: page = int(page) except: page = 1 if page <= 0: page = 1 start = (page - 1) * 5 end = page * 5 current_list = LIST_INFO[start:end] all_pager,c = divmod(len(LIST_INFO),5) if c>0: all_pager+=1 # str_page = """ # <a href="/index/1">1</a> # <a href="/index/2">2</a> # <a href="/index/3">3</a> # <a href="/index/4">4</a> # """ list_page=[] for p in range(all_pager): tmp = '<a href="/index/%s">%s</a>'%(p+1,p+1) list_page.append(tmp) str_page="".join(list_page) self.render("home/index.html", list_info=current_list,current_page=page,str_page=str_page)<div class = "pager"> <!--{{str_page}}--> {% raw str_page %}</div>实现当前页分页链接高亮
def get(self, page): try: page = int(page) except: page = 1 if page <= 0: page = 1 start = (page - 1) * 5 end = page * 5 current_list = LIST_INFO[start:end] all_pager,c = divmod(len(LIST_INFO),5) if c>0: all_pager+=1 # str_page = """ # <a href="/index/1">1</a> # <a href="/index/2">2</a> # <a href="/index/3">3</a> # <a href="/index/4">4</a> # """ list_page=[] for p in range(all_pager): if p+1 == page: tmp = '<a class="active" href="/index/%s">%s</a>' % (p + 1, p + 1) else: tmp = '<a href="/index/%s">%s</a>'%(p+1,p+1) list_page.append(tmp) str_page="".join(list_page) self.render("home/index.html", list_info=current_list,current_page=page,str_page=str_page)前端:
.pager a.active{ background-color: brown; color: white; }完整的code:
#!/usr/bin/env python# coding=utf-8import tornado.webLIST_INFO = [ {"username": "maotai", "email": "123456"},]for line in range(300): tmp={"username": "maotai", "email": "123456"} LIST_INFO.append(tmp)class IndexHandler(tornado.web.RequestHandler): # def get(self, *args, **kwargs): def get(self, page): try: page = int(page) except: page = 1 if page <= 0: page = 1 start = (page - 1) * 5 end = page * 5 current_list = LIST_INFO[start:end] all_pager,c = divmod(len(LIST_INFO),5) if c>0: all_pager+=1 # str_page = """ # <a href="/index/1">1</a> # <a href="/index/2">2</a> # <a href="/index/3">3</a> # <a href="/index/4">4</a> # """ list_page=[] for p in range(all_pager): if p+1 == page: #这里为什么p+1,因为遍历的是从0到all_pager tmp = '<a class="active" href="/index/%s">%s</a>' % (p + 1, p + 1) else: tmp = '<a href="/index/%s">%s</a>'%(p+1,p+1) list_page.append(tmp) str_page="".join(list_page) self.render("home/index.html", list_info=current_list,current_page=page,str_page=str_page) def post(self,page): username = self.get_argument("username", "") email = self.get_argument("email", "") tmp = {"username": username, "email": email} LIST_INFO.append(tmp) self.redirect("/index/"+page)<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>index</title> <style> .pager a{ display: inline-block; padding:5px; margin: 3px; background-color: cadetblue; } .pager a.active{ background-color: brown; color: white; } </style></head><body><h1>添加数据</h1><form action="/index/{{ current_page }}" method="post"> <input type="text" name="username"> <input type="email" name="email"> <input type="submit" typeof="提交"></form><h1>显示数据</h1><table border="1"> <thead> <tr> <th>用户名</th> <th>邮箱</th> </tr> </thead> <tbody> {% for line in list_info %} <tr> <td>{{ line['username'] }}</td> <!--<td>{% raw line['username'] %}</td>--> <td>{{ line['email'] }}</td> </tr> {% end %} </tbody></table><div class = "pager"> <!--{{str_page}}--> {% raw str_page %}</div></body></html>实现显示11项,当前页+-5
分析:
当总页数<11: 1 11当总页数>11: 当前页<6: 1 11 当前页>6: 当前页+5>总页数 总页数-11 总页数 当前页+5<总页数: s=page-5 t=page+5核心实现代码:
class IndexHandler(tornado.web.RequestHandler): # def get(self, *args, **kwargs): def get(self, page): try: page = int(page) except: page = 1 if page <= 0: page = 1 start = (page - 1) * 5 end = page * 5 current_list = LIST_INFO[start:end] all_pager, c = divmod(len(LIST_INFO), 5) if c > 0: all_pager += 1 # str_page = """ # <a href="/index/1">1</a> # <a href="/index/2">2</a> # <a href="/index/3">3</a> # <a href="/index/4">4</a> # """ list_page = [] if all_pager < 11: s = 1 t = 11 else: if page <= 6: s = 1 t = 11 elif page > 6: if page + 5 > all_pager: s = all_pager - 11 t = all_pager else: s = page - 5 t = page + 5 for p in range(s, t + 1): if p == page: # 这里为什么p,而不是p+1? 因为range(s, t + 1),不是从0开始的. tmp = '<a class="active" href="/index/%s">%s</a>' % (p, p) else: tmp = '<a href="/index/%s">%s</a>' % (p, p) list_page.append(tmp) str_page = "".join(list_page) self.render("home/index.html", list_info=current_list, current_page=page, str_page=str_page)封装分页class
思路
代码:
#!/usr/bin/env python# coding=utf-8import tornado.webLIST_INFO = [ {"username": "maotai", "email": "123456"},]for line in range(300): tmp = {"username": "maotai", "email": "123456"} LIST_INFO.append(tmp)class Pagination: def __init__(self, current_page, all_item): all_pager, c = divmod(len(all_item), 5) if c > 0: all_pager += 1 try: current_page = int(current_page) except: current_page = 1 if current_page <= 0: current_page = 1 self.current_page = current_page self.all_pager = all_pager @property def start(self): return (self.current_page - 1) * 5 @property def end(self): return self.current_page * 5 def page_str(self, baseurl): list_page = [] if self.all_pager < 11: s = 1 t = 11 else: if self.current_page <= 6: s = 1 t = 11 elif self.current_page > 6: if self.current_page + 5 > self.all_pager: s = self.all_pager - 11 t = self.all_pager else: s = self.current_page - 5 t = self.current_page + 5 for p in range(s, t + 1): if p == self.current_page: tmp = '<a class="active" href="%s%s">%s</a>' % (baseurl, p, p) else: tmp = '<a href="%s%s">%s</a>' % (baseurl, p, p) list_page.append(tmp) return "".join(list_page) def current_list_info(self): current_list = LIST_INFO[self.start:self.end] return current_listclass IndexHandler(tornado.web.RequestHandler): # def get(self, *args, **kwargs): def get(self, page): ## 实例化分页类 # 传入当前页 和 所有数据 # 获得current_list 即每页5条数据列表 page_obj = Pagination(page, LIST_INFO) current_list = page_obj.current_list_info() str_page = page_obj.page_str("/index/") self.render("home/index.html", list_info=current_list, current_page=page, str_page=str_page) def post(self, page): username = self.get_argument("username", "") email = self.get_argument("email", "") tmp = {"username": username, "email": email} LIST_INFO.append(tmp) self.redirect("/index/" + page)实现上一页 下一页 跳转到
效果:
原理:
利用js的方法href实现跳转.
完整的code:
#!/usr/bin/env python# coding=utf-8import tornado.webLIST_INFO = [ {"username": "maotai", "email": "123456"},]for line in range(300): tmp = {"username": "maotai", "email": "123456"} LIST_INFO.append(tmp)class Pagination: def __init__(self, current_page, all_item): all_pager, c = divmod(len(all_item), 5) if c > 0: all_pager += 1 try: current_page = int(current_page) except: current_page = 1 if current_page <= 0: current_page = 1 self.current_page = current_page self.all_pager = all_pager self.all_item=all_item @property def start(self): return (self.current_page - 1) * 5 @property def end(self): return self.current_page * 5 def current_list_info(self): current_list = LIST_INFO[self.start:self.end] return current_list def page_str(self, baseurl): list_page = [] # 上一页 --上一页 页码 下一页 必须按照顺序添加到list if self.current_page > 1: last_page = '<a href="%s%s">上一页</a>' % (baseurl, self.current_page - 1) else: last_page = '<a href="%s%s">上一页</a>' % (baseurl, self.current_page) list_page.append(last_page) # 页码页 if self.all_pager < 11: s = 1 t = 11 else: if self.current_page <= 6: s = 1 t = 11 elif self.current_page > 6: if self.current_page + 5 > self.all_pager: s = self.all_pager - 11 t = self.all_pager else: s = self.current_page - 5 t = self.current_page + 5 for p in range(s, t + 1): if p == self.current_page: tmp = '<a class="active" href="%s%s">%s</a>' % (baseurl, p, p) else: tmp = '<a href="%s%s">%s</a>' % (baseurl, p, p) list_page.append(tmp) # if self.current_page>1: # syyp = self.current_page - 1 # else: # syyp = self.current_page # # if self.current_page > len(self.all_item): # xyyp = len(self.all_item) # else: # xyyp = self.current_page # # syy = '<a href="%s%s">上一页</a>' % (baseurl, syyp) # xyy = '<a href="%s%s">下一页</a>' % (baseurl, xyyp) # list_page.insert(0,syy) # list_page.append(xyy) # 下一页 if self.current_page< self.all_pager: next_page = '<a href="%s%s">下一页</a>' % (baseurl, self.current_page+1) else: next_page = '<a href="%s%s">下一页</a>' % (baseurl, self.current_page) list_page.append(next_page) # 跳转到 ## 获取本次点击前框里输入的数据, 拼接 baseurl + 数字 就可以实现跳转 jump = """<input type="text" /><a onclick="Jump('%s',this);">GO</a>"""%(baseurl,) script="""<script> function Jump(baseUrl,ths){ var val = ths.previousElementSibling.value; if(val.trim().length>0){ location.href = baseUrl+val; } } </script> """ list_page.append(jump) list_page.append(script) return "".join(list_page)class IndexHandler(tornado.web.RequestHandler): # def get(self, *args, **kwargs): def get(self, page): page_obj = Pagination(page, LIST_INFO) current_list = page_obj.current_list_info() str_page = page_obj.page_str("/index/") self.render("home/index.html", list_info=current_list, current_page=page, str_page=str_page) def post(self, page): username = self.get_argument("username", "") email = self.get_argument("email", "") tmp = {"username": username, "email": email} LIST_INFO.append(tmp) self.redirect("/index/" + page)阅读全文
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