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。

清除session

跳转

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>{%block title %}{% endblock %}导航</title>
    <link rel="stylesheet" type="text/css" href="{{url_for('static',filename='css/daohang.css')}}">
</head>
<body bgcolor="#00ffff">
<ul>
    <li><a class="active" >首页</a></li>
    <li><a >新闻</a></li>
    <li><a >图库</a></li>
    <li><a >关于</a></li>
    <input class="eat" type="text" name="sousuo" value="请输入内容">
    <input class="eat"type="button" name="submit" value="搜索">
    
            {% if username %}
                    <li><a href="#">{{ username }}</a></li>
                    <li><a href="{{ url_for('base')}}">注销</a></li>
            {% else %}
                    <li><a href="{{ url_for('login')}}">登录</a></li>
                    <li><a href="{{ url_for('zhuce')}}">注册</a></li>
            {% endif %}
</ul>
{% block main %}{% endblock %}
{% block ma %}{% endblock %}
</body>
</html>

{% extends'daohang.html' %}
{% block title %}
<h1>登录</h1>
{% endblock %}
{% block main %}
    <head>
 <link rel="stylesheet" type="text/css" href="{{ url_for('static',filename='css/denglu.css') }}">
    <script src="../static/js/denglu.js"></script>
</head>
<body>
<div class="one"> <h2>登录</h2>
        <p>{{ username }}contextx</p>
        <form action="{{ url_for('deng') }}"method="post">
       <div class="input_box"  >
           <input id="uname" type="text" placeholder="请输入用户名">
       </div>
       <div class="input_box">
           <input id="upass" type="password" placeholder="请输入密码">
       </div>
       <div id="error_box"><br></div>
   <div class="input_box">
       <button onclick="myLogin()">登录</button>
   </div>
</form>
  </div>
</div>
</body>
{% endblock %}

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='mis1234',password='111111')
# db.session.add(user)
# db.session.commit()


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


@app.route('/login/', methods=['GET', 'POST'])
def login():
    if request.method == 'GET':
        return render_template("denglu.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:
                return redirect(url_for('base'))
            else:
                return '密码错误'
        else:
            return '用户名不存在'

@app.route('/regist/', methods=['GET', 'POST'])
def zhuce():
    if request.method == 'GET':
        return render_template("zhuce.html")
    else:
        username = request.form.get('username')
        password = request.form.get('password')
        nickname = request.form.get('nickname')
        user = User.query.filter(User.username == username).first()
        if user:
            return '用户名已存在'
        else:
            user = User(username=username, password=password, nickname=nickname)
            db.session.add(user)  # 数据库，添加操作
            db.session.commit()
            return redirect(url_for('login'))

@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'))


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

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

SQLALCHEMY_DATABASE_URI='mysql+pymysql://root:@127.0.0.1:3306/test?charset=utf8'
SQLALCHEMY_TRACK_MODIFICATIONS = False

posted on 2017-11-24 16:07 083李笑晴阅读(132) 评论(0) 收藏举报

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