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
- form
- input
-
onclick="return fnLogin()"
- py:
- @app.route设置methods
- GET
- POST
- 读取表单数据
- 查询数据库
- 用户名密码对:
- 记住用户名
- 跳转到首页
- 用户名密码不对:
- 提示相应错误。
- 用户名密码对:
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
js:
function fnLogin() { var oUname = document.getElementById("uname"); var oError = document.getElementById("error_box"); var oUpass = document.getElementById("upass"); var isError=true; oError.innerHTML="<br>" if(oUname.value.length<6 || oUname.value.length >12){ oError.innerHTML="用户名6-12位"; return false; }else if ((oUname.value.charCodeAt(0)>=48) && (oUname.value.charCodeAt(0)<=57)){ oError.innerHTML="第一位只能是字母"; return false; } else for (var i=0 ; i<oUname.value.length;i++){ if (oUname.value.charCodeAt(i)<48 || (oUname.value.charCodeAt(i)>57)&&(oUname.value.charCodeAt(i)<97)|| oUname.value.charCodeAt(i)>122){ oError.innerHTML="只能是字母或数字"; return false; } } if(oUpass.value.length<6 || oUpass.value.length>12){ oError.innerHTML="密码6-12位"; return false; } return true; window.alert("登录成功") }
html:
{% extends'base.html' %} {% block title %} 登录 {% endblock %} {% block head %} <link rel="stylesheet"type="text/css"href="{{ url_for('static',filename='css/login.css') }}"> <script src="{{ url_for('static',filename='js/login.js') }}"></script> {% endblock %} {% block main %} <body> <div class="aa" > <div class="login" ><h2>登录</h2></div> <form action="{{ url_for('login')}}" method="post"> <div class="aa1" > 账号:<input id="name" type="text" name="username" placeholder="请输入用户名"><br> 密码:<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="return myLogin()">登录</button> <button type="button" onclick=window.alert("是否取消登录!")>取消</button> </div> </div> </body> {% endblock %}
session:
import os
SECRET_KEY = os.urandom(24)
SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://root:@localhost:3306/mis_db?charset=utf8'
SQLALCHEMY_TRACK_MODIFICATIONS = False
python:
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 base(): return render_template('base.html') @app.route('/shouye/') def shouye(): return render_template('shouye.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 return redirect(url_for('shouye')) else: return u'password error' else: return u'username is not existed.' @app.route('/zhuce/',methods=['GET','POST']) def zhuce(): if request.method == 'GET': return render_template('zhuce.html') else: usern = request.form.get('username') passw = request.form.get('password') user = User.query.filter(User.username == usern).first() if user: return u'username existed' else: user1 = User(username=usern, password=passw) db.session.add(user1) db.session.commit() return redirect(url_for('login')) @app.route('/wenda/') def wenda(): return render_template('wenda.html') if __name__ == '__main__': app.run(debug=True)