mongoose入门学习：https://github.com/i5ting/nodejs-fullstack/blob/master/mongoose.md
jQuery Validate:http://www.runoob.com/jquery/jquery-plugin-validate.html
完成功能如图所示：填入已经存在的用户名会提示“请修正此字段”
图片.png
图片.png
一、建立数据库模型
var config = require('config-lite');
var mongoose = require("mongoose");
mongoose.Promise = global.Promise;
mongoose.connect(config.mongodb);
var Schema = mongoose.Schema;
var UserSchema = new Schema({
username:String,
password:String
});
UserSchema.index({username:1});
module.exports = mongoose.model('User',UserSchema);
二、对数据库进行操作
var UserModel = require('../lib/mongo');
module.exports ={
//创建一个用户
create:function create(user){
return UserModel.create(user);
},
//通过用户名获取用户信息
getUserByName:function getUserByName(username){
return UserModel.findOne({username:username}).exec();
}
}
三、ejs页面
<form method="post" id="foo">
用户名：<input type="text" name="name" id="username" required="true"><br/>
密 码：<input type="password" name="password" id="password" required="true"><br/>
确认密码：<input type="password" name="repassword" required="true"><br/>
<input type="submit" value="注册">
</form>
<script src="http://static.runoob.com/assets/jquery-validation-1.14.0/lib/jquery.js"></script>
<script src="http://static.runoob.com/assets/jquery-validation-1.14.0/dist/jquery.validate.min.js"></script>
<script src="http://static.runoob.com/assets/jquery-validation-1.14.0/dist/jquery.validate.min.js"></script>
<script src="http://static.runoob.com/assets/jquery-validation-1.14.0/dist/localization/messages_zh.js"></script>
<script src="user.js"></script>
四、用jQuery Validate验证
var validator = $("#foo").validate({
rules: {
name: {
required: true, // 必须输入
rangelength: [1,10],// 输入字符串长度在2-10之间
remote:{
url:"/signup/signupcheck", //后台处理数据地址
type:"post",
dataType:"json",
data:{
username:function(){
return $("#username").val();
}
}
}
},
password: {
required: true,
minlength: 6// 输入字符串最短长度为6
},
repassword: {
required: true,
minlength: 6,
equalTo: "#password" // 输入的值必须和#password中的值相等，用于判断两次输入的密码是否相等
}
},
});
五、注册
var sha1=require('sha1');
var express = require('express');
var bodyParser = require('body-parser');
var router =express.Router();
//var UserModel = require('../lib/mongo');
var UserModel = require('../models/users');
router.get('/',function(req,res,next){
res.render('signup.ejs');
});
router.post('/',function(req,res,next){
var username = req.body.name; //从表单获取name
var password = req.body.password;
var repassword = req.body.repassword;
//待写入数据库的信息
var user={
username:username,
password:password,
}
UserModel.create(user)
.then(function(result){
req.session.user=user;
//req.flash('success','注册成功');
res.redirect('/login');
})
});
router.post('/signupcheck',function(req,res,next){
var name = req.body.name;
user = req.session.user;
UserModel.getUserByName(name) // UserModel是用户操作数据库的模型，getUserByName 方法是查找name用户
.then(function (user) {
console.log(user);
if (user) {
res.json(false);
//console.log("用户已经存在");
} else {
res.json(true);
}
})
.catch(next);
});
module.exports = router;
使用body-parser中间件一定要这样写：
app.use(bodyParser.urlencoded({
extended: true
}));
