登录之后更新导航

用上下文处理器app_context_processor定义函数
1. 获取session中保存的值
2. 返回字典
在父模板中更新导航，插入登录状态判断代码。
1. 注意用{% ... %}表示指令。
2. {{ }}表示变量

完成注销功能。

清除session

跳转

from flask import Flask,redirect,request,url_for,session
from flask import render_template
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)
    nickname=db.Column(db.String(20))

# db.create_all()
#查询
# user=User.query.filter(User.username=='mis1234').first()
# print(user.id,user.username,user.password)

#增加
# user=User(username='mis1234',password='111111',nickname='l')
# db.session.add(user)
# db.session.commit()

#增加
# user=User(username='luk',password='123456',nickname='lu')
# db.session.add(user)
# db.session.commit()
# 修改
# user=User.query.filter(User.username=='mis1234').first()
# user.password='12345678'
# db.session.commit()
#
# # 删除
# user=User.query.filter(User.username=='mis1234').first()
# db.session.delete(user)
# db.session.commit()


@app.route('/')
def base():
    return render_template('base.html')


@app.route('/login/',methods=['GET','POST'])
def login():
    if request.method == 'GET':
        return render_template('login.html')
    else:
        usern = request.form.get('username')
        passw = request.form.get('password')
        user = User.query.filter(User.username == usern).first()
        if user:
            if user.password==passw:
                session['user']=usern
                return redirect(url_for('shouye'))
            else:
                 return '密码错误。'
        else:
            return  '用户名不存在。'

@app.route('/register/',methods=['GET','POST'])
def register():
    if request.method=='GET':
        return render_template('register.html')
    else:
        usern=request.form.get('username')
        nickn = request.form.get('nickname')
        passw = request.form.get('password')
        user=User.query.filter(User.username==usern).first()
        if user:
            return '用户名已存在。'
        else:
            user1=User(username=usern,password=passw,nickname=nickn)
            db.session.add(user1)
            db.session.commit()
            return redirect(url_for('login'))#重定回向登录页面


@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('/question/')
def question():
    return render_template('question.html')

@app.route('/shouye/')
def shouye():
    return render_template('shouye.html')

if __name__ == '__main__':
    app.run(debug=True)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>{% block title%}父模板{% endblock %}</title>
    <script src="{{url_for('static',filename='js/base.js') }}" type="text/javascript"></script>
    <link href="{{ url_for('static' ,filename='css/base.css') }}"  rel="stylesheet" type="text/css">
    {% block head %}
    {% endblock %}
</head>
<body id="myBody">
<nav>
<div class="container">
   <form>
    <img id="images" src="{{ url_for('static',filename='images/flower.jpg') }}" alt="fl" width="50">
    <a class="one" href="{{url_for('shouye')}}">首页&nbsp;&nbsp;</a>
    <a class="one" href="{{url_for('question')}}">发布问题&nbsp;&nbsp;</a>
    <input id="keyword" type="text" name="search" placeholder="请输入关键字">
    <input type="submit" value="搜索">
       {% if username %}
           <a class="login" href="#">{{ username }}</a>
           <a class="register" href="{{url_for('logout')}}">注销</a>
       {% else %}
           <a class="login" href="{{url_for('login')}}">登录</a>
           <a class="register" href="{{url_for('register')}}">注册</a>
       {% endif %}

    <img id="on_off" onclick="mySwitch()" src="../static/images/bulbon.gif">
        </form>
</div>
</nav>
{% block main %}
<footer>
    <div class="footer_box">
         Copyright@ 2017-2022 个人版权，版权所有
     </div>
 </footer>
{% endblock %}

posted on 2017-11-24 11:40 087陆倩霞阅读(219) 评论(0) 收藏举报

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