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

主py文件：

from flask import Flask,request,render_template,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=TabError,autoincrement=True)
    username = db.Column(db.String(20),nullable=False)
    password = db.Column(db.String(20), nullable=False)

#db.create_all()

# #增加
# user = User(username='123456',password = '456789')
# db.session.add(user)
# db.session.commit()
#
# #查询
# user =User.query.filter(User.username =='abcdef').first()
# print(user.username,user.password)
#
# #修改
# user =User.query.filter(User.username =='123456').first()
# user.password='abcdef'
# print(user.username,user.password)
# db.session.commit()
#
# #删除
# user =User.query.filter(User.username =='123456').first()
# print(user.username,user.password)
# db.session.delete(user)
# db.session.commit()

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

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


@app.route('/dl/',methods=['GET','POST'])
def dl():
    if request.method == 'GET':
        return render_template("dl.html")
    else:
        usern = request.form.get('name')
        password = request.form.get('password')
        user = User.query.filter(User.username == usern).first()
        if user:
            if user.password == password:
                session['user'] = usern
                return redirect(url_for('dh'))
            else:
                return '密码错误(〃＞皿＜)'
        else:
            return '用户不存在┌(。Д。)┐'

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

@app.route('/zc/',methods=['GET','POST'])
def zc():
    if request.method == 'GET':
        return render_template("zc.html")
    else:
        usern = request.form.get('name')
        password = request.form.get('password')
        user = User.query.filter(User.username == usern).first()
        if user:
            return '用户名已存在┗|*｀0′*|┛ '
        else:
            user1 = User(username=usern, password=password)
            db.session.add(user1)
            db.session.commit()
            return redirect(url_for('dl'))

@app.route('/tc/')
def tc():
    session.clear();
    return redirect(url_for('sy'))


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

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

父模板：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>
        {% block title %}
        {% endblock %}
        导航页</title>
    <link rel="stylesheet" type="text/css" href="{{ url_for('static',filename='css/dh.css') }}">
     <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    <script src="{{ url_for('static',filename='js/dh.js') }}"></script>
</head>
{% block head %}
{% endblock %}

<nav class="navbar navbar-default" role="navigation">
        <div class="container-fluid">
            <div class="navbar-header">
                <a class="navbar-brand" href="http://127.0.0.1:5000/"><img class="tubiao" id="tubiao" src="../static/image/movie.jpg"></a>
            </div>
            <form class="navbar-form navbar-left" role="search">
                <div class="form-group">
                    <input type="text" class="form-control" placeholder="✍输入您感兴趣的">
                </div>
                <button type="submit" class="btn btn-default">查找</button>
            <button type="button" class="btn btn-default navbar-btn">导航栏</button>
             </form>
            <ul class="nav navbar-nav navbar-right" id="myBody">
                <li ><img class="tupian" id="myOnOff" onclick="myswitch()" src="../static/image/sun.png"></li>
                <li><a href="{{ url_for('sy') }}"><span class="glyphicon .glyphicon-home"></span> 首页</a></li>
                {% if username %}
                    <li><a href="#">{{ username }}</a></li>
                    <li><a href='{{ url_for('tc') }}'>退出</a></li>
                {% else %}
                    <li><a href="{{ url_for('zc') }}"><span class="glyphicon glyphicon-user"></span> 注册</a></li>
                    <li><a href="{{ url_for('dl') }}"><span class="glyphicon glyphicon-log-in"></span> 登录</a></li>
                {% endif %}
                    <li><a h   ref="{{ url_for('fk') }}"><span class="glyphicon .glyphicon-pencil"></span> 反馈</a></li>

            </ul>

        </div>
    </nav>

<body id="myBody">
{% block main %}
     <p><span style="background-color: black;font-family: '方正舒体', Helvetica, Arial, sans-serif;font-size: 50px;color:red;align:center">☝☝请使劲戳顶部导航栏或底部导航栏☟☟</span></p>
{% endblock %}

<div class="dibu">
    <hr align=center width=100% color=#c0c0c0 SIZE=1>
    <nav>
     <a class="daohang"  href="http://www.360kan.com/dianying/index.html">360影视</a>
     <a class="daohang"  href="http://www.youku.com/">优酷</a>
     <a class="daohang"  href="http://v.qq.com/?ptag=360.kuzhan">腾讯视频</a>
     <a class="daohang"  href="https://www.mgtv.com/">芒果TV</a>
     <a class="daohang"  href="http://www.iqiyi.com/?vfm=f_268_360d&fv=07668579fcb3b76994a863f602b0dce3">爱奇艺</a>
    </nav>
    <p>版权@silky-L</p>
</div>
</body>
</html>

posted @ 2017-11-24 11:28 101黎思琦阅读(200) 评论(0) 编辑收藏举报

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