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

function fnLogin(){
            var uName = document.getElementById("uname");
            var uPass = document.getElementById("upass");
            var uError = document.getElementById("error_box");
            var isError=true;

            uError.innerHTML="<br>"
            //用户名
            if(uName.value.length<6|| uName.value.length>12) {
                uError.innerHTML = "用户名需在6-12位中间";
                isError=false;
                return isError;
            }
           else if ((uName.value.charCodeAt(0)>=48)&&(uName.value.charCodeAt(0)<=57)){
                uError.innerHTML = "用户名开头不能为数字";
                isError=false;
                return isError;
            }
            else for(var i=0;i<uName.value.length;i++){
                if((uName.value.charCodeAt(i)<48 || uName.value.charCodeAt(i)>57)&&(uName.value.charCodeAt(i)<97 ||uName.value.charCodeAt(i)>122)){
                    uError.innerHTML = "用户名只能为数字或字母";
                    isError=false;
                    return isError;
                }
                }
            //密码
            if(uPass.value.length>12||uPass.value.length<6){
                uError.innerHTML="密码需在6-12位中间";
                return;
            }
            window.alert("登录成功！")
        }
{% extends'index.html' %}
{% block head %}
    <link rel="stylesheet" href="{{ url_for('static',filename='css/logsign.css')}}" type="text/css">
    <script src="{{ url_for('static',filename='js/login.js') }}"></script>
{% endblock %}
{% block main %}
<body>
<div class="pen-title">
  <h1>登 录</h1>
</div>
<div class="from">
    <h2>请登录您的账号</h2>
     <form class="form" method="post" action="{{ url_for('signin') }}">
        <div class="input_box">
           <input id="uname" type="text" placeholder="请输入用户名" name="username">
        </div>
        <br>
        <div class="input_box">
            <input id="upass" type="password" placeholder="请输入密码" name="password">
        </div>
        <div id="error_box"><br></div>
        <div class="login_box">
            <button onclick="fnLogin()">登录</button>
        </div>
     </form>
</div>
{% 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):

    __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)

 

 

# db.create_all()

@app.route('/')

def daohang():

    return render_template('daohang.html')

 

 

@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')

        # nickname=request.form.get('nickname')

        user = User.query.filter(User.username == username).first()

        if user:

            session['user']=username

            session.permanent=True

            return redirect(url_for('daohang'))

        else:

            return 'error username or password'

        # if user:

        #     return 'username existed'

        # else:

        #     user=User(username=username,password=password)

        #     db.session.add(user)

        #     db.session.commit()

        return redirect(url_for('daohang'))

 

@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('regist'))

 

@app.route('/regist/', methods=['GET', 'POST'])

def regist():

    if request.method == 'GET':

        return render_template('regist.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 'username existed'

        else:

            user = User(username=username, password=password)

            db.session.add(user)

            db.session.commit()

            return redirect(url_for('login'))

 

 

@app.route('/biaoqian/')

def biaoqian():

    return render_template('biaoqian.html')

 

 

if __name__ == '__main__':

    app.run(debug=True)

posted @ 2017-11-24 11:31 066谢平坚阅读(99) 评论(0) 收藏举报

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