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

 

{% extends 'base.html' %}
{% block title %}注册{% endblock %}

{% block head %}
<link rel="stylesheet" type="text/css" href="{{ url_for('static',filename='css/login.css') }}">
    <script src="{{url_for('static',filename='js/zhuce.js') }}" type="text/javascript"></script>
{% endblock %}
{% block main %}
<div class="box" >
    <h1>用户注册</h1>
    <form method="post" action={{url_for('zhuce')}}>

        <input class="loginInput" type="text"  id="uname" placeholder="Uname" required="required" name="username">
        <input class="loginInput" type="text"  id="nickname" placeholder="Nickname" required="required" name="nickname">
        <input class="loginInput" type="text"  id="phone" placeholder="Phone number" required="required" name="phone">
        <input class="loginInput" type="password"  id="upass" placeholder="Password" required="required"name="password">
        <input class="loginInput" type="password"  id="cpassword" placeholder="Confirm password" required="required">
        <div id="error_box"><br></div>
        <div class="input_box">
        <button onclick="myLogin()" type="submit" class="btn btn-primary btn-block btn-large">立即注册</button><br>
        <button onclick=window.alert("是否取消注册？") type="submit" class="btn btn-primary btn-block btn-large">cancel</button>
        </div>
    </form>
</div>


{% endblock %}

function myLogin() {
        var oUname = document.getElementById("uname");
        var oError = document.getElementById("error_box");
        var opassword = document.getElementById("upass");
        var ophone = document.getElementById("phone");
        var ocpassword=document.getElementById("cpassword");

        oError.innerHTML=="<br>";

         if(oUname.value.length<6||oUname.value.length>12){
                oError.innerHTML="number of uname6-12";
                return false;
            }
         else if((oUname.value.charCodeAt(0) >= 48) && (oUname.value.charCodeAt(0)<= 57)){
                oError.innerHTML = "first number";
               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="only letter or number";
                     return false;
             }
            }
         if(ophone.value.length<11||ophone.value.length>11){
                oError.innerHTML="number of phone11";
                return false;
             }
         if(opassword.value.length<6||opassword.value.length>12){
                oError.innerHTML="number of password6-12";
                     return false;
           }
         else if (opassword.value!=ocpassword.value){
        oError.innerHTML="cpassword error";
                return false;
         }
              return true;
         window.alert("注册成功")
         }

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('/zhuce/', methods=['GET', 'POST'])
def zhuce():
    if request.method == 'GET':
        return render_template('zhuce.html')
    else:
        username = request.form.get('username')
        nickname = request.form.get('nickname')
        phone = request.form.get('phone')
        password = request.form.get('password')
        user = User.query.filter(User.username == username).first()
        if user:
            return 'username existed'
        else:
            user = User(username=username, password=password, nickname=nickname, phone=phone)
            db.session.add(user)
            db.session.commit()
            return redirect(url_for('login'))


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


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