登录之后更新导航

Posted 2020-10-15 Jay

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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

处理器
@app.context_processor
def mycontext():
    username = session.get(\'user\')
    if username:
        return {\'username\': username}
    else:
        return {}

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

from flask import Flask, render_template,request,redirect,url_for
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(50))

#增
#user = User(username =\'ccccls\',password=\'111111\' )
#db.session.add(user)
#db.session.commit()
#查
#user=User.query.filter(User.username ==\'ccccls\').first()
#print(user.username,user.password)
#删
#user=User.query.filter(User.username ==\'ccccls\').first()
#db.session.delete(user)
3db.session.commit()
#改
#user=User.query.filter(User.username ==\'ccccls\').first()
#user.password=\'ccccls\'
#db.session.commit()
#db.create_all()

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


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


@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==username).first()
        if user:
            return u\'username existed\'
        else:
            user=User(username=username,password=password)
            db.session.add(user)
            db.session.commit()
            return redirect(url_for(\'login\'))


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


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


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


</nav>
{% block main %}    <p>{{ username }}xyjie</p>
{% endblock %}

 <link rel="stylesheet" type="text/css" href="xyjie.css">
 
 <link rel="stylesheet" href="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/css/bootstrap.min.css">

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

<nav class="navbar navbar-inverse" role="navigation">
    <div class="container-fluid">
        <div class="navbar-header">
            <a class="navbar-brand" href="#">首页</a>
        </div>
        <div>
            <ul class="nav navbar-nav">
                <li><a href="#" onclick="">登陆</a></li>
                <li><a href="#" onclick="">注册</a></li>
                <li class="dropdown">
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                        设置 <b class="caret"></b>
                    </a>
                    <ul class="dropdown-menu">
                        <li><a href="#">收藏</a></li>
                        <li><a href="#">分享</a></li>
                        <li><a href="#">搜索</a></li>
                        <li class="divider"></li>
                        <li><a href="#">点赞</a></li>
                    </ul>
                </li>
                <li><a href="#">||</a></li>
            </ul>
        </div>
        <div style="float: left">
            <img id="myonoff" onclick="mySwitch()" src="http://p0.so.qhimgs1.com/bdr/200_200_/t01d734a105379159dc.gif" style width="40px"  >
        </div>
        <div>
            <input type="text" name="user" id="user" placeholder="请输入内容">
            <input type="button" value="搜索" class="btn btn-success" onclick="">
        </div>
    </div>
</nav>

<nav class="navbar navbar-inverse navbar-fixed-bottom" role="navigation">
    <ul class="nav navbar-nav">
        <li><img src="http://www.gzcc.cn/2016/images/footer1-logo.png"></li>
        <li style="color: bisque;">版权所有@xyjie</li>
    </ul>
</nav>

<div>
    <div class="sa">
        <a href="http://desk.zol.com.cn/"><img
                src="https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=2330928080,25031233&amp;fm=27&amp;gp=0.jpg"></a>
        <div class="st"><a href="http://desk.zol.com.cn/">花花华晨宇1</a></div>
    </div>
    <div class="sa">
        <a href="http://desk.zol.com.cn/"><img
                src="https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=3605928156,2200570185&amp;fm=27&amp;gp=0.jpg"></a>
        <div class="st"><a href="http://desk.zol.com.cn/">花花华晨宇2</a></div>
    </div>
    <div class="sa">
        <a href="http://desk.zol.com.cn/"><img
                src="https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=2787456122,2827006597&amp;fm=27&amp;gp=0.jpg"></a>
        <div class="st"><a href="http://desk.zol.com.cn/">花花华晨宇3</a></div>
    </div>
    <div class="sa">
        <a href="http://desk.zol.com.cn/"><img
                src="https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=2478028302,36965079&amp;fm=27&amp;gp=0.jpg"></a>
        <div class="st"><a href="http://desk.zol.com.cn/">花花华晨宇4</a></div>
    </div>
</div>

</footer>

完成注销功能。

清除session

跳转

@app.route(\'/logout/\')
def logout():
    session.clear()
    return redirect(url_for(\'base\'))

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