完成登录功能，用session记住用户名

登录功能完成：

js:设置return
html:设置
1. form
2. input
3. ```
onclick="return fnLogin()"
```
py:
1. @app.route设置methods
2. GET
3. POST
  1. 读取表单数据
  2. 查询数据库
    1. 用户名密码对：
      1. 记住用户名
      2. 跳转到首页
    2. 用户名密码不对：
      1. 提示相应错误。

session：

从`flask`中导入`session`
设置`SECRET_KEY`

操作字典一样操作`session`：增加用户名`session['username']=`username

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('/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 u'username existed'
        else:
            user=User (username=username,password=password,nickname=nickname)
            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'

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

import os
SECRET_KEY = os.urandom(24)
SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://root:@localhost:3306/mis_db?charset=utf8'
SQLALCHEMY_TRACK_MODIFICATIONS = False

{% extends 'base.html' %}

{% block title %}登录{% endblock %}

{% block head %}
    <link href="{{ url_for('static',filename='css/login.css') }}" rel="stylesheet" type="text/css">
    <script src="{{ url_for('static',filename='js/login.js') }}"></script>
{% endblock %}
<body background="http://img2.imgtn.bdimg.com/it/u=1662655920,2109868634&fm=200&gp=0.jpg"></body>

{% block main %}
<div class="aa" >
    <div class="login" ><h2>LOGIN</h2></div>
    <form action="{{ url_for('login') }}"method="post">
    <div class="aa1" >
        Username：<input id="name" type="text"name='username'placeholder="请输入用户名"><br>
        Password：<input id="password" type="password"name='password'placeholder="请输入密码"><br>
        </div>
        <div id="error_box"><br></div>
      <div class="aa2" >
         <button onclick="myLogin()">Login</button>
         <button type="button" onclick=window.alert("是否取消登录！")>Cancel</button>
<body background="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1510743700&di=99ef867fd6c5a1386163e38f9d7b5f2c&imgtype=jpg&er=1&src=http%3A%2F%2Fstatic.leiphone.com%2Fuploads%2Fnew%2Farticle%2Fpic%2F201610%2F57fb516e1b62a.jpg%3Fwatermark%2F1%2Fimage%2FaHR0cDovL20uaWdhbzcuY29tL3Jlc1dlYi9pbWFnZXMvc2h1aXlpbi5wbmc%3D%2Fdissolve%2F80%2Fgravity%2FSouth%2Fdx%2F20%2Fdy%2F20"style="background-repeat:no-repeat;background-size: 100% 100%; background-attachment: fixed;"></body>

    </div>
        </form>
</div>

{% endblock %}

function myLogin(){
            var uName=document.getElementById("name");
            var uError=document.getElementById("error_box");
            var upass = document.getElementById("password");
            var isError=true;
            uError.innerHTML = "<br>"
            //uname
            if(uName.value.length>12 || uName.value.length<6){
                uError.innerHTML="Username 6-12 bits";
                isError=false;
                return isError;
            }else if((uName.value.charCodeAt(0)>=48)&& uName.value.charCodeAt(0)<=57){
                uError.innerHTML="The first letter cannot be numeric";
                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 = "only letter or number.";
                    isNotError=false;
                    return isError;
                }
            }


            if(upass.value.length>12 || upass.value.length<6){
                uError.innerHTML="password 6-12 bits";
                isError=false;
                return isError;
            }
            return isError;


        }

posted @ 2017-11-22 16:12 060王昊阅读(230) 评论(0) 编辑收藏举报

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完成登录功能，用session记住用户名

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