zoukankan html css js c++ java

登录之后更新导航

1.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

2.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

3.完成注销功能。

清除session
跳转

base.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>基础模块</title>
     {% block title %}
     {% endblock %}
     <link rel="stylesheet" href="{{ url_for('static',filename='css/base.css')}}">
    <script src="{{ url_for('static',filename='js/base.js') }}"></script>
     <base target="_blank" />
{% block head %}
{% endblock %}

<base href="http://i1.sinaimg.cn/dy/weather/main/index14/007/icons_32_yl/"target="_blank">
</head>
<body id="myBody">
<div class="clearfloat">


     <nav >
         <img src="w_02_08_00.png" >
        <a href="{{ url_for('index') }}" >首页</a>
         <a href="">下载</a>
         <a href="">图书馆</a>
         <a href="">意见反馈</a>
         <a href="{{ url_for('question') }}">发布问答</a>
         <input type="text" name="search">
         <button type="submit">搜索</button>
         <a href="" >联系我们</a>
     {% if username %}
         <a class="right" href="#">{{ username }}</a>
         <a href="{{ url_for('logout') }}">注销</a>
    {% else %}
         <a class="right" href="{{ url_for('login') }}">登录</a>
         <a href="{{ url_for('zhuce') }}">注册</a>
    {% endif %}

<img id="myOnOff" onclick="mySwitch()" src="http://www.runoob.com/images/pic_bulbon.gif" width="20px";>
     </nav><hr>

</div>

<br>

<br>
<br>
<br><br>
<h1>
    广州商学院欢迎你!
</h1>
<br><br>
<h1>
    活力广商，筑梦远航！
</h1>
<br><br><br>

        <div id="footer" style="background-color: lightskyblue;clear: both;text-align: center;"></div>
    <div class="desc" >
        <hr>
        <div class="img" >
            <a href="http://www.gzcc.cn/">
                <img src="https://timgsa.baidu.com/timg?image&amp;quality=80&amp;size=b9999_10000&amp;sec=1508497686486&amp;di=e2ccca98fa05f9473c84f73db141ad88&amp;imgtype=0&amp;src=http%3A%2F%2Fpic1.win4000.com%2Fwallpaper%2F7%2F57ac36088f69c.jpg" width="20px">
            </a>
            <div><a href="http://www.gzcc.cn/">数字广商</a></div>
        </div>

        <div class="img">
            <a href="http://www.gzcc.cn/">
                <img src="https://timgsa.baidu.com/timg?image&amp;quality=80&amp;size=b9999_10000&amp;sec=1508497686476&amp;di=50b7102b085d85e015eff1b2d31436ea&amp;imgtype=0&amp;src=http%3A%2F%2Fimg5.xiazaizhijia.com%2Fwalls%2F20150803%2F1440x900_96ae2cb132cbe37.jpg"></a>
                <div><a href="http://www.gzcc.cn/">视频校园</a></div>
        </div>

        <div class="img" class="clearfloat" class="img-hover">
            <a href="http://www.gzcc.cn/">
                <img src="https://timgsa.baidu.com/timg?image&amp;quality=80&amp;size=b9999_10000&amp;sec=1508498137537&amp;di=82dbcda3618e2dfd61810d2fb0daf202&amp;imgtype=0&amp;src=http%3A%2F%2Fpic1.win4000.com%2Fwallpaper%2F1%2F5754d121da01d.jpg"></a>
                <div><a href="http://www.gzcc.cn/">画说校园</a></div>
        </div>

        <div class="img">
            <a href="http://www.gzcc.cn/">
                <img src="https://timgsa.baidu.com/timg?image&amp;quality=80&amp;size=b9999_10000&amp;sec=1508498264263&amp;di=55e6cb21f27b29f83d3c9ff9a73b3bae&amp;imgtype=0&amp;src=http%3A%2F%2Fwww.zcool.com.cn%2Fcommunity%2F037b9a359147e96b5b3086ed42c6bee.jpg" width="80px"></a>
                <div><a href="http://www.gzcc.cn/">全景校园</a></div>


 </div>
        </div>
<footer>
 <div class="footer_box">
     Copyright © 2017 广州商学院 All Rights Reserved　  版权归本学校所有
 </div>
 </footer>
{% block main %}
{% endblock %}
</body>
</html>

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):
    __table__name = '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))

#db.create_all()

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

@app.route('/zhuce/',methods=['GET','POST'])
def zhuce():
    if request.method =='GET':
        return  render_template('zhuce.html')
    else:
        usern = request.form.get('name')
        teln = request.form.get('password')
        passw = request.form.get('password1')
        user = User.query.filter(User.username==usern).first()
        if user:
            return 'username existed'
        else:
            user= User(username=usern,tel=teln,password=passw)
            db.session.add(user)
            db.session.commit()
            return redirect(url_for('login'))

@app.route('/login/', methods=['GET','POST'])
def login():
    if request.method == 'GET':
        return render_template('login.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:
                session['user'] = username
                return redirect(url_for('index'))
            else:
                return u'password error'
        else:
            return u'username is not existed'

@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('index'))


@app.route('/question/',methods=['GET','POST'])
def question():
    return render_template('question.html')

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

查看全文

相关阅读:
Hibernate(十三)迫切内连接fetch
SQL多表联合查询(交叉连接，内连接，外连接)
Hibernate入门(十二)离线条件检索
 Java基础IO流(二)字节流小案例
 Java基础IO流(一)
Hibernate入门(十一)多对多案例
 mysql下载安装及常见问题
 数据库表数据恢复
 linux的自有（内置）服务
 linux下的别名机制

原文地址：https://www.cnblogs.com/gdlyzx/p/7891756.html