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,request,render_template,redirect,url_for,session
from flask_sqlalchemy import SQLAlchemy
import sqlconnect
from functools import wraps
from  datetime import datetime


app = Flask(__name__)
app.config.from_object(sqlconnect)#app连接数据库
db = SQLAlchemy(app)

class User(db.Model):
    __tablename__ ='user1'
    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)
    #againpass = db.Column(db.String(20), nullable=False)


#db.create_all()

#增加
# user = User(username ='xxxxx1',password ='123456')
# db.session.add(user)
# db.session.commit()
#查找
# user = User.query.filter(User.username =='xxxxx1').first()
# user.password ='123456'
# user.againpass='123456'
# print(user.id,user.username,user.password)
#删除
# user = User.query.filter(User.username =='xxxxx1').first()
# db.session.delete(user)
# db.session.commit()

@app.route('/')
def first():
    return render_template("first.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('first'))

@app.route("/login/",methods=['GET','POST'])
def sign_in():
    if request.method =='GET':
        return render_template("sign_in.html")
    else:
        name = request.form.get('name')
        passw = request.form.get('password')
        user = User.query.filter(User.username == name).first()
        #判断用户名是否存在
        if user:
            #判断密码是否正确
            if user.password == passw:
                session['user']=name#记住用户名
                return redirect(url_for('first'))
            else:
                return u'密码错误！'
        else:
            return u'不存在该用户名！'


@app.route("/regiter/",methods=['GET','POST'])
def sign_up():
    if request.method == 'GET':
        return render_template("sign_up.html")
    else:
        name = request.form.get('newname')
        passw = request.form.get('newpass')
        samename = User.query.filter(User.username == name).first()
        if samename:
            return u'username existed!'

        else:
            # 将用户名和密码存入数据库
            users =User(username = name ,password = passw)
            db.session.add(users)
            db.session.commit()
            return render_template("sign_in.html")#注册成功后跳转到登录界面


@app.route("/question/")
def question():
    return render_template("wenda.html")


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

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>{% block title %}{% endblock %}France </title>
    <link href="../static/base.css" rel="stylesheet" type="text/css">
    <script src="../static/base.js"></script>
{% block head %}{% endblock %}
</head>
<body class="bodycolor" id="myBody">
<div class="daohanglang" id="daohanglang">
    <nav>
                <img class="turn_on_off" id="on_off" onclick="mySwitch()" src="{{ url_for('static',filename='image/on.jpg') }}" width="40px">
                <a class="daohang"  href="{{ url_for('first')}}">首页</a>
                <a class="daohang"  href="">卢浮宫</a>
                <a class="daohang"  href="">塞纳河</a>
                <a class="daohang"  href="">埃菲尔铁塔</a>
                <a class="daohang"  href="">香榭丽大道</a>
                <a class="daohang"  href="">巴黎圣母院</a>
                <input class="sousuo" id="sousuo" type="text" placeholder="搜索" >
                <img onclick="chaZhao()" id="chazhao" src="{{ url_for('static',filename='image/on.jpg') }}" width="20px">
    </nav>
    <nav>
        {% if username %}
            <a class="daohangright" href="{{ url_for('logout') }}">注销</a>
            <a class="daohangright" href="#">{{ username }}</a>

        {% else %}
            <a class="daohangright" href="{{ url_for('sign_up') }}" >注册</a>
            <a class="daohangright" href="{{ url_for('sign_in') }}" >登录</a>
        {% endif %}


    </nav>
<HR align=center width=100% color=#c0c0c0 SIZE=1>
</div>
{% block main %}{% endblock %}
<div class="foot-menu" id="dibudaohang">
    <HR align=center width=100% color=#c0c0c0 SIZE=1>
    <nav>
        <a class="daohang"  href="">法国历史</a>
        <a class="daohang"  href="">法国地图</a>
        <a class="daohang"  href="">旅行攻略</a>
        <a class="daohang"  href="{{ url_for('question') }}">发布问答</a>
        <p>版权@ linxx</p>
    </nav>

</div>
</body>
</html>

posted on 2017-11-24 11:54 102林晓霞阅读(174) 评论(0) 收藏举报

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