完成注册功能

1. js文件： onclick函数return True时才提交表单，return False时不提交表单。
2. html文件：
   1. <form>中设置 action和method="post"
   2. <input> 中设置 name
3. 主py文件中：
   1. from flask import  request, redirect, url_for
   2. @app.route('/regist/', methods=['GET', 'POST’])

def regist():

   if request.method == 'GET':

        return render_template('regist.html')

   else:

        username = request.form.get(‘username’)#获取form中的数据

        判断用户名是否存在:存在报错

  不存在，存到数据库中

       redirect重定向到登录页

 

from flask import Flask,render_template,request,redirect,url_for
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)
    nickname = db.Column(db.String(50))
#db.create_all()

@app.route('/')
def shouye():
    return render_template('base.html') #跳转首页
@app.route('/denglu/')
def gg():
    return render_template('denglu.html') #跳转登录
@app.route('/zhuche/', methods=['GET','POST'])
def login():
    if request.method =='GET':
        return render_template('zhuche.html')#跳转注册
    else:
        usern = request.form.get('username')
        passw = request.form.get('password')
        nickn = request.form.get('nickname')
        user = User.query.filter(User.username == usern).first()
        if user:
            return u'username existed'
        else:
            user1 = User(username = usern,password = passw,nickname = nickn)
            db.session.add(user1)#数据库操作
            db.session.commit()
            return redirect(url_for('gg'))
@app.route('/tupian/')
def hh():
    return render_template('tupian.html') #跳转图片库
@app.route('/fabu/')
def fabu():
    return render_template('fabu.html') # 跳转发布
if __name__ == '__main__':
    app.run(debug=True)

 

SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://root:@127.0.0.1:3306/mis_15?charset=utf8'
SQLALCHEMY_TRACK_MODIFICATIONS = False

 

{% extends 'base.html' %}
{% block zhucetitle %}注册{% endblock %}
{% block zhucehead %}
    <title>Registration</title>
    <link rel="stylesheet" type="text/css" href="../static/css/zhuce.css">
    <script src="../static/js/regis.js"></script>
{% endblock %}
{% block zhucebody %}
     <div class="box">
          <h2>Registration</h2>

     <form action="{{ url_for('login') }}" method="post">
          <div class="input_box">
                <input type="text" id="user" placeholder="Username" name="username">
          </div>
          <div class="input_box">
                     <input type="text" id="nick"  placeholder="Nickname" name="nickname">
        </div>

          <div class="input_box">
                <input type="password" id="upass" placeholder="Password"name="password">
          </div>

          <div class="input_box">
                <input type="password" id="upass1" placeholder="Input again">
          </div>

          <div id="error_box"><br>
          </div>

          <div class="input_box">
            <button onclick="fnRegistration()">Enter</button>
          </div>
         </form>
     </div>
{% endblock %}

 

function fnRegistration() {
    var uSer = document.getElementById("user");
    var oPass = document.getElementById("upass").value;
    var oPass1 = document.getElementById("upass1").value;
    var oError = document.getElementById("error_box");

    oError.innerHTML = "<br>";

    // 验证用户名
    if (uSer.value.length < 6 || uSer.value.length > 20) {
        oError.innerHTML = "用户名只能6-20位";
        return false;
    } else if ((uSer.value.charCodeAt(0) >= 48) && (uSer.value.charCodeAt(0) <= 57)) {
        oError.innerHTML = "用户名首字母不能是数字";
        return
    } else for (var i = 0; i < uSer.value.length; i++) {
        if ((uSer.value.charCodeAt(i) < 48) || (uSer.value.charCodeAt(i) > 57) && (uSer.value.charCodeAt(i) < 97) || (uSer.value.charCodeAt(i) > 122)) {
            oError.innerHTML = "用户名只能由数字和字母组成";
            return false;
        }
    }

    // 验证密码
    if (pAss.value.length < 6 || pAss.value.length > 20) {
        oError.innerHTML = "密码只能6-20位";
        return false;
    }

   
    else if (oPass != oPass1) {
        ducument.getElementById("error_box").innerHTML = "两次密码不一致";
        return false;

    }// 验证再次输入的密码

    return true;
    }