Javascript 从node.js在mongoDB数据库中插入数据_Javascript_Node.js_Mongodb

Javascript 从node.js在mongoDB数据库中插入数据

javascript node.js mongodb

Javascript 从node.js在mongoDB数据库中插入数据,javascript,node.js,mongodb,Javascript,Node.js,Mongodb,上下文：要从node.js在mongoDB数据库中插入数据吗问题陈述：我试图在mongoDB数据库中插入数据，但抛出了一个错误。我找不到当前输出：参考错误附加代码： filter.js index.html 您似乎没有完全掌握javascript的异步特性。传递给函数的变量仅存在于该函数的作用域中。请参阅此注释代码： var express = require('express'), http = require('http'), fs = require('fs'),

上下文：要从node.js在mongoDB数据库中插入数据吗

问题陈述：我试图在mongoDB数据库中插入数据，但抛出了一个错误。我找不到

当前输出：参考错误

附加代码：

filter.js

index.html

您似乎没有完全掌握javascript的异步特性。传递给函数的变量仅存在于该函数的作用域中。请参阅此注释代码：

var express = require('express'),
    http = require('http'),
    fs = require('fs'),
    mongoose = require('mongoose');

mongoose.connect('mongodb://localhost/filter_CheckBoxSchema', function(err){
  if(err){
    console.log(err);
  } else{
    console.log('Connected to mongodb!');
  }
});

//Lets read our html file only once, at the very beginning when we first start our nodejs process
fs.readFile('./index.html', function (err, html) {

  //Now in here there are two variables which are accessible, `err` and `html`

  if (err) {
    throw err; 
  } 

  //Create our schema before starting server
  var filter_CheckBoxSchema = mongoose.Schema({
    name: String,
    type: Boolean,
    created: {type: Date, default: Date.now}
  });

  //And now the model as well
  var Filter = mongoose.model('Store', filter_CheckBoxSchema);

  //Now lets start our server
  http.createServer(function(request, response) {
    //The code here is called whenever a new http request is sent to the server
    //There are two variables accessible here, one is `request` which contains
    //data about the original request, while `response` is an object with methods
    //allowing you to respond

    //Here we check what kind of method the browser is using, if its POSTing
    //data then we create a filter from the body
    if (request.method == "POST") {
      new Filter({
        name: request.body.name,
        type: request.body.gender,

      }).save(function(err, doc){
        if(err) 
        {
          throw err;
        }
        else {
          response.send('Successfully inserted!!!');
        }
      });
    }
    else {
      //This must have been a GET request, lets just send `html` instead
      response.writeHeader(200, {"Content-Type": "text/html"});  
      response.write(html);  
      response.end();
    }
  }).listen(8000);        
});

问题正是错误所说的：在调用新过滤器的范围内没有定义请求。您可以告诉我在哪里更改所有内容。这里需要更多地阅读nodej和回调。节点编程是异步的，您在这里的编程风格是希望每一行在调用下一行之前完成，但这不是它的工作方式。您最好在如此低的级别上查看而不是实施。这个网站上有很多例子，也有很多问题。搜索并阅读，然后提问。

<html>
<head>
    <title>Please enter your details</title>
</head>
    <body>
    <h3>Please enter your details</h3>
    <p>Please register below!!!</p>

    <form action="filter.js" method="POST">
    Name: <input type="text" name="Name" />
    <br /><p></p>
    Gender:
    <br /> 
    <input type="radio" name="gender"/> Male
    <br />
    <input type="radio" name="gender"/> Female
    <p></p>
    Interest: (Check all that apply)
    <p>
    </p>
    <input type="checkbox" name="breakfast"/> Breakfast
    <br/>
    <input type="checkbox" name="Lunch"/> Lunch
    <br />
    <input type="checkbox" name="Evening Snacks"/> Evening Snacks
    <br />
    <input type="checkbox" name="Dinner"/> Dinner
    <br />
    <p></p>
    <input type="submit" name="submit" value="Register!!!" />
    </form>
    </body>

</html>

C:\node\people discovery app>node filter.js
Connected to mongodb!

C:\node\people discovery app\filter.js:152
                name: request.body.name,
                      ^
ReferenceError: request is not defined
    at C:\node\people discovery app\filter.js:152:9
    at fs.js:271:14
    at Object.oncomplete (fs.js:107:15)

var express = require('express'),
    http = require('http'),
    fs = require('fs'),
    mongoose = require('mongoose');

mongoose.connect('mongodb://localhost/filter_CheckBoxSchema', function(err){
  if(err){
    console.log(err);
  } else{
    console.log('Connected to mongodb!');
  }
});

//Lets read our html file only once, at the very beginning when we first start our nodejs process
fs.readFile('./index.html', function (err, html) {

  //Now in here there are two variables which are accessible, `err` and `html`

  if (err) {
    throw err; 
  } 

  //Create our schema before starting server
  var filter_CheckBoxSchema = mongoose.Schema({
    name: String,
    type: Boolean,
    created: {type: Date, default: Date.now}
  });

  //And now the model as well
  var Filter = mongoose.model('Store', filter_CheckBoxSchema);

  //Now lets start our server
  http.createServer(function(request, response) {
    //The code here is called whenever a new http request is sent to the server
    //There are two variables accessible here, one is `request` which contains
    //data about the original request, while `response` is an object with methods
    //allowing you to respond

    //Here we check what kind of method the browser is using, if its POSTing
    //data then we create a filter from the body
    if (request.method == "POST") {
      new Filter({
        name: request.body.name,
        type: request.body.gender,

      }).save(function(err, doc){
        if(err) 
        {
          throw err;
        }
        else {
          response.send('Successfully inserted!!!');
        }
      });
    }
    else {
      //This must have been a GET request, lets just send `html` instead
      response.writeHeader(200, {"Content-Type": "text/html"});  
      response.write(html);  
      response.end();
    }
  }).listen(8000);        
});