- 用上下文处理器app_context_processor定义函数
- 获取session中保存的值
- 返回字典
- 在父模板中更新导航，插入登录状态判断代码。、
- 注意用{% ... %}表示指令。
- {{ }}表示变量
- 完成注销功能。
- 清除session
- 跳转
py主文件代码：
from flask import Flask, render_template,request,redirect,url_for,session from flask_sqlalchemy import SQLAlchemy import config app = Flask(__name__) app.config.from_object(config) db = SQLAlchemy(app) class User(db.Model): __tablename__ = 'user' id = db.Column(db.Integer, primary_key=True, autoincrement=True) username = db.Column(db.String(20), nullable=False) password = db.Column(db.String(20), nullable=False) #db.create_all() # # 增加 # user = User(username = 'zhuyinyin',password='113428164508') # db.session.add(user) # db.session.commit() # 修改 # ser=User.query.filter(User.username =='zhuyinyin').first() # user.password='123' # print(user.username,user.password) # db.session.commit() #查询： # User.query.filter(User.username == 'zhuyinyin').first() # print(user.username,user.password) # db.session.commit() # 修改： # user.password = '111111' # db.session.commit() # 删除： # db.session.delete(user) # db.session.commit() @app.route('/') def hello_world(): return render_template('ba.html') @app.route('/zhuce/',methods=['GET','POST']) def zhuce(): if request.method == 'GET': return render_template('zhuce.html') else: username = request.form.get('username') # 获取form中的数据 password = request.form.get('password') # 获取form中的数据 # email = request.form.get('email') # 获取form中的数据 user = User.query.filter(User.username ==username).first() if user: return'用户已存在' else: user = User(username = username,password=password) db.session.add(user) db.session.commit() return redirect(url_for('denglu')) # @app.route('/denglu/',methods=['GET','POST']) # def denglu(): # if request.method=='GET': # return render_template('denglu.html') # else: # username=request.form.get('username') # password=request.form.get('password') # user=User.query.filter(User.username==username,User.password==password).first() # #判断用户名是否存在 # if user: # if user.password==password: # return redirect(url_for('shouye')) # else: # return '密码错误' # else: # return '用户不存在' #第二种写法 @app.route('/denglu/',methods=['GET','POST']) def denglu(): if request.method=='GET': return render_template('denglu.html') else: username = request.form.get('username') password = request.form.get('password') user=User.query.filter(User.username==username).first() #判断用户名是否存在 if user: session['user']=username session.permanent=True if user.password==password: return redirect(url_for('shouye')) else: return '密码错误' else: return '此用户不存在' @app.context_processor def mycontext(): usern=session.get('user') if usern: return {'username':usern} else: return{} @app.route('/logout/') def logout(): session.clear(); return redirect(url_for('shouye')) @app.route('/shouye/') def shouye(): return render_template('shouye.html') @app.route('/wenda/') def wenda(): return render_template('wenda.html') if __name__ == '__main__': app.run(debug=True)
父模板代码如下：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title> {% block title %} {% endblock %} 导航栏</title> <link rel="stylesheet" href="{{ url_for('static',filename='css/base.css') }}"> <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> <script src="{{ url_for('static',filename='js/base.js') }}"></script> <nav class="navbar navbar-default" role="navigation"> <div class="container-fluid"> <div class="navbar-header"> <a class="navbar-brand" href="#">广州商学院</a> </div> <form class="navbar-form navbar-left" role="search"> <div class="form-group"><input type="text" class="form-control" placeholder="输入您感兴趣的"></div> <button type="submit" class="btn btn-default" style="width: 70px">查询</button> </form> <ul class="nav navbar-nav navbar-right" id="myBody"> <li><img src="{{ url_for('static',filename='css/123.jpg') }}" alt="" width="40px"></li> <li><a href="{{ url_for('shouye') }}">校园首页</a></li> <li><a href="#">校园新闻</a></li> <li><a href="{{ url_for('wenda') }}">问答平台</a></li> <li style="margin-top: 1.8%"><img id="myOnOff" onclick="mySwitch()" src="http://www.runoob.com/images/pic_bulbon.gif" width="18px">夜间模式 </li> {% if username %} <li><a href="#">{{ username }}</a></li> <li><a href='{{ url_for('logout') }}'>注销</a></li> {% else %} <li><a href="{{ url_for('zhuce') }}"><span class="glyphicon glyphicon-user"></span> 注册</a></li> <li><a href="{{ url_for('denglu') }}"><span class="glyphicon glyphicon-log-in"></span> 登录</a></li> {% endif %} <li> <select style="margin-top: 18%"> <option style="width: 100px">个人中心</option> <option>收藏</option> <option>点赞</option> <option>评论</option> </select></li> <li><a href="#"><span class=""></span> 退出</a></li> </ul> </div> </nav> </head> <body id="myBody" style="background-image:url(https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1509736823780&di=ae2cf40eb448c691380cda401a29628a&imgtype=0&src=http%3A%2F%2Fimage.kuakao.com%2F2015%2F1120%2F20151120105350738.jpg)"> {% block main %}{% endblock %} <footer> <div class="foot"> <div><a href="#"> 联系我们</a> · <a href="#"> 加入我们</a> · <a href="#"> 品牌与徽标 </a> · <a href="#">帮助中心</a> · <a href="#">合作伙伴</a></div> <div>©2015-2017 电话：020-66666666</div> <div>©2015-2017 地址0000000</div> <div>©2015-2017 邮箱：020-66666666</div> </div> </footer> </body> <nav class="navbar navbar-default navbar-fixed-bottom" role="navigation"> <div class="container-fluid"> <div class="navbar-header"> <a class="navbar-brand" href="#">广商美景集</a> </div> <div> <ul class="nav navbar-nav"> <li class="active"><a href="#">日景</a></li> <li class="active"><a href="#">晚景</a></li> <li class="active"><a href=""><img src="http://img17.3lian.com/d/file/201703/03/0840bd7fcb29a3dca53723e66c7d11ee.jpg" style="width: 150px"></a> <div class="desc"><a href="">全景</a></div> </li> <li class="active"><a href=""><img src="http://img1.3lian.com/2015/a1/137/d/37.jpg" style="width: 150px"></a> <div class="desc"><a href="">春天</a></div> </li> <li class="active"><a href=""><img src="http://img17.3lian.com/201612/21/6310c81f8385d0e991b5336805695b50.jpg" style="width: 150px"></a> <div class="desc"><a href="">夏天</a></div> </li> <li class="active"><a href=""><img src="http://img1.3lian.com/2015/a1/136/d/200.jpg" style="width:150px"></a> <div class="desc"><a href="">秋天</a></div> </li> <li class="active"><a href=""><img src="http://img1.3lian.com/2015/a1/137/d/37.jpg" style="width: 150px"></a> <div class="desc"><a href="">冬天</a></div> </li> <li class="active"><a href=""><img src="http://f12.baidu.com/it/u=166738647,1428225560&fm=72" style="width: 150px"></a> <div class="desc"><a href="">夜景</a></div> </li> </ul> </div> </div> </nav> </html>
首页代码如下：
{% extends 'ba.html' %} {% block title %} 首页 {% endblock %} {% block main %} <link rel="stylesheet" type="text/css" href="../static/css/wenda.css"> <p>{{ username }}我的注册页面</p> <div class="box"> <div id="tittle"><h2 align="center">反馈</h2></div> <div> <label for="questionDetail">首页</label><br> <textarea class="form-control" id="questionDetail" rows="10" style="width: 500px"></textarea><br> </div> <div id="error_box"><br></div> <div class="input_button"><button onclick="foLogin()">提交</button></div> </div> {% endblock %}
