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。

1. function fnEnroll() {
               var oZname=document.getElementById("zname");
               var oZpass1=document.getElementById("zpass1");
               var oZpass2=document.getElementById("zpass2");
               var oError=document.getElementById("error_box");
               var isError=true;
   
               oError.innerHTML="<br>"
   
               if ((oZname.value.length < 6) || (oZname.value.length > 12)) {
                   oError.innerHTML = "用户名要6-12位";
                   isError=false;
                   return isError;
               }else if ((oZname.value.charCodeAt(0)>=48)&&(oZname.value.charCodeAt(0)<=57)){
                   oError.innerHTML="首字母必须是字母";
                   isError=false;
                   return isError;
               }else for(var i=0;i<oZname.value.length;i++){
                   if ((oZname.value.charCodeAt(i)<48)||(oZname.value.charCodeAt(i)>57)&&(oZname.value.charCodeAt(i)<97) ||(oZname.value.charCodeAt(i)>122)){
                       oError.innerHTML="用户名只能是字母和数字";
                       isNotError=false;
                       return isError;
                   }
               }
               if ((oZpass1.value.length < 6) || (oZpass1.value.length > 12)) {
                   oError.innerHTML = "密码要6-12位";
                   isError=false;
                   return isError;
   
               }else if (oZpass1.value!= oZpass2.value) {
                   oError.innerHTML = "两次密码不一致";
                   isError=false;
                   return isError;
               }
               return isError;
       window.alert("注册成功！")
           }

2.html文件：

1. 1. <form>中设置 action和method="post"
   2. <input> 中设置 name

{% extends'base.html' %}
{% block title %}注册{% endblock %}
{% block head %}
    <link rel="stylesheet" type="text/css" href="{{ url_for('static',filename='css/enroll.css') }}">
    <script src="{{ url_for('static',filename='js/enroll.js') }}"></script>
{% endblock %}


{% block main %}
<div class="box">
    <h2>注册</h2>
    <form action="{{ url_for('enroll') }}" method="post">
    <div class="input_box">
        <input  id="zname" type="text"placeholder="设置您的用户名" name="username">
        <input  id="znickname" type="text"placeholder="设置您的昵称" name="nickname">
    </div>
    <div class="input_box">
        <input  id="zpass1" type="password"placeholder="设置您的密码" name="password">
    </div>
    <div class="input-box">
        <input id="zpass2" type="password" placeholder="重新输入一样的密码">
    </div>
        <div class="input_box">
        <a href="{{ url_for('login') }}">已有账号，登录</a>
    </div>

    <div id="error_box"><br></div>
    <div class="input_box">
        <button class="button" onclick="fnEnroll()">立即注册</button>
    </div>
    </form>
</div>
{% endblock %}

3.主py文件中：

1. 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)

# 创建用户模型
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()
# 首页
@app.route('/')
def index():
    return render_template('base.html')

#登录
@app.route('/login/',methods={'GET','POST'})
def login():
    return render_template('login.html')

#注册
@app.route('/enroll/',methods={'GET','POST'})
def enroll():
    if request.method=='GET':
        return render_template('enroll.html')
    else:
        username=request.form.get('username')# 获取form中的数据
        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)#数据库操作
            db.session.commit()
            return redirect(url_for('login'))# 重定向到登录页


 #提问
@app.route('/questions/')
def questions():
    return render_template('questions.html')


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

运行结果：

1.网页结果：

2.数据库结果：