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。
1. 清除session
2. 跳转

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)
    nickname = db.Column(db.String(20))

db.create_all()

#user=User(username='jun',password='12345')
#db.session.add(user)
#db.session.commit()

#user=User.query.filter(User.username=='jun').first()
#user.password='123456'
#db.session.commit()
#print(user.id,user.username,user.password)

# user=User.query.filter(User.username=='jun').first()
# db.session.delete(user)
# db.session.commit()

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

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

@app.route('/sign_up/',methods=['GET','POST'])
def sign_up():
    if request.method=='GET':
        return render_template('sign_up.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 '该用户名已存在'
        else:
            user1=User(username=usern,nickname=nickn,password=passw)
            db.session.add(user1)
            db.session.commit()
            return redirect(url_for('sign_in'))


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

@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('base'))


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

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>welcome</title>
    <link  href="{{ url_for('static',filename='css/nino.css') }}" rel="stylesheet" type="text/css" >
    <script src="{{ url_for('static',filename='js/aiba.js') }}"></script>

</head>
<body id="myBody">

<div id="container">

    <ul>
        <img src="{{ url_for('static',filename='images/ars.jpg') }}"width="100px">
        <img id="on_off" onclick="mySwitch()" src="http://img2.imgtn.bdimg.com/it/u=1878009223,3806655311&fm=200&gp=0.jpg" width="50px">
        <li><a href="{{ url_for('base') }}" >首页</a></li><li><a href="{{ url_for('questions') }}">发布问答</a></li>
        <li><input type="text" class="text" placeholder="搜索">
        <input type="submit" value="搜索"data-disable-with="搜索"></li>
        {% if username %}
            <li><a href="#" style="margin-right: -10px;color:deepskyblue">{{ username }}</a></li>
            <li><a href="{{ url_for('logout') }}" >注销</a></li>
        {% else %}
            <li><a href="{{ url_for('sign_in') }}" >登录</a></li>
            <li><a href="{{ url_for('sign_up') }}" >注册</a></li>
        {% endif %}

        </ul>

　<div id="footer">
    <p>you are my soul soul 18週年おめでとう</p></div>
    </div>
</body>
</html>

登录后：

点击注销后：

posted @ 2017-11-24 12:31 086黄向薇阅读(113) 评论(0) 收藏举报

刷新页面返回顶部

黄向薇

登录之后更新导航

公告