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

py文件

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)
    Telphone = db.Column(db.String(20), nullable=True)


# db.create_all()
@app.route('/')
def index():
    return render_template('index.html')

@app.route('/login/', methods=['GET', 'POST'])
def login():
    if request.method == 'GET':
        return render_template('login.html')
    else:
        usern = request.form.get('Username')
        passn = request.form.get('Password')
        user = User.query.filter(User.Username == usern).first()
        if user:
            if user.Password == passn:
                session['user'] = usern
                return redirect(url_for('index'))
            else:
                return '密码错误'
                # return window.alert("密码错误")
        else:
            # return window.alert("用户名不存在")
            return '用户名不存在'

@app.context_processor
def mycontext():
    usern=session.get('user')
    if usern:
        return  {'Username':usern}
    else:
        return {}

# def login_re(func):
#     @wraps(func)
#     def wrapper(*args:**kwargs):
@app.route('/logout/')
def logout():
    session.clear()
    return  redirect(url_for("index"))


@app.route('/register/', methods=['GET', 'POST'])
def register():
    if request.method == 'GET':
        return render_template('register.html')
    else:
        usern = request.form.get('Username')
        passn = request.form.get('Password')
        teln = request.form.get('Telphone')
        user = User.query.filter(User.Username == usern).first()
        if user:
            return '用户名已经存在'
        else:
            user1 = User(Username=usern, Password=passn, Telphone=teln)
            db.session.add(user1)
            db.session.commit()
            return redirect(url_for('login'))


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


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

base.html

<!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 rel="stylesheet" type="text/css" href="{{ url_for('static',filename='css/base.css') }}">
    {% block head %}{% endblock %}
</head>
<body id="myBody">
<nav class="daohang">
    <div class="daohang_box">
        <a class="shouye" href="{{ url_for('index') }}">首页</a>
        <input id="search_box" type="text" placeholder="请输入关键词查找">
        <button id="search" type="submit">搜索</button>
        <a class="xiaoqu3" href="{{ url_for('question') }}">发布问答</a>
        <img id="on_off" onclick="mySwitch()" src="{{ url_for('static',filename='images/bulbon.png') }}" >
        {%  if Username %}
            <a class="xiaoqu1" href="#">{{Username }}</a>
            <a class="xiaoqu2" href="{{ url_for('logout') }}">注销</a>
        {% else %}
            <a class="xiaoqu1" href="{{ url_for('login') }}">登录</a>
            <a class="xiaoqu2" href="{{ url_for('register') }}">注册</a>
        {%  endif %}
    </div>
</nav>
<br><br>
<!-- 要加的代码，主页部分区别于登录注册界面-->
{% block main %}{% endblock %}
<footer class="foot">
    <div class="foot_box">
        <a>诺心公告</a>
        <a>关于诺心</a>
        <a>联系我们</a>
        <a>客服服务</a>
        <a>食品经营许可证</a>
        <a>生产许可证</a>
        <a>上海工商</a>
        <h2>欢迎前来订购蛋糕</h2>
    </div>
</footer>
</body>
</html>

注销

posted @ 2017-11-24 11:43 爱学习的土豆阅读(116) 评论(0) 编辑收藏举报

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