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
from flask_sqlalchemy import SQLAlchemy
import config
from flask import Flask,render_template,request,redirect, url_for,session

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()

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

@app.route('/login/',methods=['GET','POST'])
def login():
    if request.method == 'GET':
        return render_template('login.html')
    else:
        usern = request.form.get('username')
        passw = request.form.get('password')
        user = User.query.filter(User.username == usern).first()
        if user:
            if user.password==passw:
                session['user'] = usern
                session.permanent = True
                return redirect(url_for('base'))
            else:
                return u'password error'
        else:
            return u'password is not existed'

@app.route('/rege/',methods=['GET','POST'])
def rege():
    if request.method =='GET':
        return render_template('rege.html')
    else:
        usern = request.form.get('username')
        nickn =request.form.get('nickname')
        passw = request.form.get('password')
        user = User.query,filter(User.username ==usern).first()
        if user:
            return 'username.existed'
        else:
            user1 = User(username=usern,password=passw,niciname = nickn)
            db.session.add(user1)
            db.session.commit()

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


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

{% extends 'basic.html' %}
{% block title %}登陆{% endblock %}

{% block head %}
    <link rel="stylesheet" type="text/css" href="{{ url_for('static',filename='../staticcss/20.css') }}">
    <link rel="stylesheet" type="text/css" href="{{ url_for('static',filename='../staticcss/200.css') }}">
    <link rel="stylesheet" type="text/css" href="{{ url_for('static',filename='../static/css/2000.css') }}">
    <script src="{{url_for('static',filename='../static/js/39.js') }}" type="text/css"></script>
{% endblock %}

{% block login %}
</head>
<body class="abc">
<h1 align="center" class="ads">Welcome to gzcc</h1>

<h4 align="center"class="ads"> Management system</h4>
<div style="margin:0" align="center">
<div  id="container" style="width:400px " >
    <div class="touming" id="header" style="background-color: aqua;color: darkcyan;"><h2 align="center" style="margin-bottom:0;">LOG IN TO GZCC</h2></div>

<form align="center" >
    username:<input id="uname" type="text"name="username"placeholder="username"><br>
    password:<input id="upass" type="password"name="password" placeholder="password"><br>
    <a href="https://image.baidu.com/">Forgot Password?</a>
    <div id="error_box"> <br></div>
    <input class="body"  type="button" onclick="return myLogin()" value="Log In"style="width: 250px;height: 50px;background-color: aqua;">
<div id="content" style=";height:150px;width:400px;float:left;"></div>
    <div class="touming" id="footer" style="background-color:aqua;clear:both;text-align:center;color: darkcyan;">版权 © djc</div>
</form>
</div>
</div>
</body> </html>{% endblock %}

function myLogin() {
            var oUname=document.getElementById("uname");
            var oUpass=document.getElementById("upass");
            var oError=document.getElementById("error_box");
            oError.innerHTML="<br>";
            if (oUname.value.length<6||oUname.value.length>20){
                oError.innerHTML="用户名需要大于6或者用户名需要小于20.";
                return false;
            }else if ((oUname.value.charCodeAt(0)>=48)&&(oUname.value.charCodeAt(0)<=57)){
                oError.innerHTML="用户名首字母不能为数字";
                return false;
            }else for(var i=0;i<oUname.value.lengtt;i++){
                if((oUname.value.charCodeAt(i)<48||oUname.value.charCodeAt(i)>57)&&(oUname.value.charCodeAt(i)<97||oUname.value.charCodeAt(i)>122)){
                oError.innerHTML="用户名只能由数字和字母组合"}
                return false;
            }
            if (oUpass.value.length<6||oUpass.value.length>20 ){
                oError.innerHTML="密码需要大于6或者密码需要小于20.";
                return false;
            }
            window.alert("LINK START!")
        }

posted @ 2017-11-23 20:07 067杜嘉成阅读(112) 评论(0) 编辑收藏举报

会员力量，点亮园子希望

刷新页面返回顶部

hskwnbr

完成登录功能，用session记住用户名

公告