#learnnodejs

[aptrons-blog]

When it comes to mastering Node.js, finding the right training institute is crucial for unlocking its full potential. In Gurgaon, APTRON stands out as a premier NodeJs Training Institute, offering comprehensive courses tailored to cater to both beginners and experienced developers. Located in the heart of Gurgaon, APTRON provides a dynamic learning environment equipped with state-of-the-art facilities and industry-experienced instructors. Whether you're delving into Node.js for the first time or aiming to enhance your skills, APTRON's Node.js training program covers the spectrum, ensuring a thorough understanding of this powerful runtime environment. For those seeking a NodeJs Training Institute in Gurgaon that combines comprehensive learning with practical experience and industry relevance, APTRON stands tall as the premier choice. Experience top-notch training, embark on a transformative learning journey, and unleash your potential in Node.js with APTRON Gurgaon.

[codeonedigest]

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[admeci]

Learn with Best Node.js Training Institute in Delhi

AAdvanced technologies like Node.js are become an important skills to have for every web development these days. Learning HTML, CSS, JavaScript and PHP is not enough to be called as full stack web developer in the industry. Industry needs developers who are updated with the latest technologies.

So, it becomes must to learn Node.js for every web aspirant.

Now, come to what you need to know to start.

For developing a good command on this technology, you first need to learn advanced next generation JavaScript.

In order to start in a right way, join a professional Node.js training institute like ADMEC which is located in New Delhi and has been offering both classroom and online training for last so many years.

ADMEC offers 3 types of Node.js courses that deals with different levels of concepts.

The most advanced and complete course is Node.js Master Plus course that is of 3 months duration. It covers everything that one needs to learn to become a master of this programming technology.

Go through the course content and explore the key takeaways of this course.

For other two, you can follow the following links:

1. Node.js Master Course

2. Node.js Standard Course

Feel free to contact us at +91 9911-7823-50 or mail us at admecrohini@gmail.com.

[nodejsus]

Node.js Tutorial | Learn Node.js | Node.js Training  https://morioh.com/p/229a82b9dfda?f=5ece1a68f0e6056e36305f65 #morioh #NodejsTutorial #LearnNodejs #NodejsTraining #nodejs

[akshay-09]

In this node.js tutorial you will learn node.js from scratch. You will know what is node.js, advantages of it, core modules of node.js, node package manager, how to own module in node.js, local & global packages and how to install node.js in detail.

[n-school]

Reasons To Learn Node.Js For Web Development

https://www.n-school.com/reasons-learn-node-js-web-development/

[tutorials-website]

Node.js Tutorials for beginners in hindi | Sync and Async function in fi...

[phungthaihy]

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[nodejs-fan]

Build Node.js RESTful APIs in 30 Minutes ☞ https://blog.learnstartup.net/p/build-node-js-restful-apis-in-30-minutes/ #javascript #Node #learnnodejs

[codeonedigest]

Nodejs Cron Job Scheduler & Cron Expression Tutorial in JavaScript with ... Full Video Link       https://youtu.be/yI_xAky_-3c         Hello friends, new #video on #cronjob #jobscheduler #scheduler #cronexpression in #nodejs #javascript #projeect #application #tutorial #examples is published on #codeonedigest #youtube channel.  @java #java #aws #awscloud @awscloud @AWSCloudIndia #salesforce #Cloud #CloudComputing @YouTube #youtube #azure #msazure  #codeonedigest @codeonedigest  #nodejs #cronjob #javascript #nodejstutorial #learnnodejs #node.js #nodejsandexpressjstutorial #cronjobexample #jobscheduling #jobscheduler #cronjobscheduler #javascriptcronjob #javascriptjobscheduler #javascripttutorialforbeginners #javascripttutorial #javascriptfullcourse #cronscheduler #cronjobschedulerexpression #cronexpression #cronexpressioninjavascript #nodejscronexpression #nodejsjobscheduler #nodejscronjob #nodejstutorial #job

[javascriptpro]

Learn Node.js API's Fast and Simple ☞ https://goo.gl/NQ7JkW #nodejs #node #learnnodejs

[javascriptnext]

Learn Node.js API's Fast and Simple ☞ https://goo.gl/NQ7JkW #nodejs #node #learnnodejs

[lenidea]

NodeJS 学习笔记（Day 2）

获取POST数据，并呈现在web端

参考资料：NodeJS GET/POST请求 

对之前的代码做如下修改

var http = require('http'); var url = require('url'); var util = require('util'); var querystring = require('querystring');// add http.createServer(function(req, res){ res.writeHead(200, {"Content-Type": "text/html"}); res.write("<h1>Node.js</h1>"); res.write("<p>What's happened.</p>"); res.write("<div>"+util.inspect(url.parse(req.url, true))+"</div>"); var params = url.parse(req.url, true).query; res.write("<div>"+params.name+"</div>"); res.write("<p>Hello Node.JS</p>"); res.write("<form method='post'><input type='text' name='postname'><input type='submit' name='submit'></form>"); // add var body = ""; // add req.on('data', function(chunk){ // add body += chunk; // add }) // add req.on('end', function(){ // add body = querystring.parse(body); // add if(body.postname){ // add res.write("<div>"+body.postname+"</div>"); // add } // add res.end(); }) // add }).listen(8000); console.log("HTTP server is listening at prot 8000.");

运行后，刷新浏览器，页面出现了输入框和提交按钮，输入内容后提交，页面正常将刚刚提交的信息展现出来。 以新增的代码都用// add标记出来了，基本还是非常容易看懂的。从新增代码来看，接收的post对象首先要从req.on('data', function(chunk){...}中获得，此时应该是字符串，然后通过querystring.parse(body)进行解析，获得可以调用的对象格式。但是不明白为什么示例代码要在req.on('end', function(){})代码块中执行，所以尝试对代码做如下修改：

var http = require('http'); var url = require('url'); var util = require('util'); var querystring = require('querystring'); http.createServer(function(req, res){ res.writeHead(200, {"Content-Type": "text/html"}); res.write("<h1>Node.js</h1>"); res.write("<p>What's happened.</p>"); res.write("<div>"+util.inspect(url.parse(req.url, true))+"</div>"); var params = url.parse(req.url, true).query; res.write("<div>"+params.name+"</div>"); res.write("<p>Hello Node.JS</p>"); res.write("<form method='post'><input type='text' name='postname'><input type='submit' name='submit'></form>"); var body = ""; req.on('data', function(chunk){ body += chunk; }) // 去除了req.on('end', function(){}) 代码块包裹 body = querystring.parse(body); if(body.postname){ res.write("<div>"+body.postname+"</div>"); } res.end(); }).listen(8000); console.log("HTTP server is listening at prot 8000.");

运行后发现系统报错如下：

/Users/chiguyong/Public/NodeJS/LearnNodeJS/http.js:17 body += chunk; ^ TypeError: Cannot convert object to primitive value at IncomingMessage.<anonymous> (/Users/chiguyong/Public/NodeJS/LearnNodeJS/http.js:17:17) at emitOne (events.js:96:13) at IncomingMessage.emit (events.js:189:7) at readableAddChunk (_stream_readable.js:176:18) at IncomingMessage.Readable.push (_stream_readable.js:134:10) at HTTPParser.parserOnBody (_http_common.js:123:22)

表明无法转换。非常奇怪，猜测是后续的代码在req.on('data', function(..){...})前已经之星过，所以body已经是对象了，为验证猜测，又将代码修改了下：

var http = require('http'); var url = require('url'); var util = require('util'); var querystring = require('querystring'); http.createServer(function(req, res){ res.writeHead(200, {"Content-Type": "text/html"}); res.write("<h1>Node.js</h1>"); res.write("<p>What's happened.</p>"); res.write("<div>"+util.inspect(url.parse(req.url, true))+"</div>"); var params = url.parse(req.url, true).query; res.write("<div>"+params.name+"</div>"); res.write("<p>Hello Node.JS</p>"); res.write("<form method='post'><input type='text' name='postname'><input type='submit' name='submit'></form>"); var body = ""; req.on('data', function(chunk){ body += chunk; body = querystring.parse(body); if(body.postname){ res.write("<div>"+body.postname+"</div>"); } }) res.end(); }).listen(8000); console.log("HTTP server is listening at prot 8000.");

此时系统依然报错，但是内容是：

events.js:161 throw er; // Unhandled 'error' event ^ Error: write after end at ServerResponse.write (_http_outgoing.js:450:15) at IncomingMessage.<anonymous> (/Users/chiguyong/Public/NodeJS/LearnNodeJS/http.js:20:17) at emitOne (events.js:96:13) at IncomingMessage.emit (events.js:189:7) at readableAddChunk (_stream_readable.js:176:18) at IncomingMessage.Readable.push (_stream_readable.js:134:10) at HTTPParser.parserOnBody (_http_common.js:123:22)

这个错误显而易见，就是在end之后是不允许做res.write操作的，那么也就印证之前的一个疑问，req.on()的操作是在函数体外面代码之后执行的。那么暂时回复到一开始的代码，希望通过后面的学习，摸清这部分的代码的执行先后顺序。

由于最近要处理一个项目的方案，所以留给学习的时间不多，今天只留了1小时时间对POST相关的操作做了学习，大致碰到几个异常的情况也摸索了原因。至少目前来看，有一个可行的代码结构是可以用来处理GET和POST的。只是，当前的所有项目代码都很丑陋，HTML也是硬编码输出到页面上的，后续主要需要了解Node对文件、数据库的相关操作，以及比较重要的模块化和代码的优雅性。

[akshay-09]

In this node.js tutorial you will learn node.js from scratch. You will know what is node.js, advantages of it, core modules of node.js, node package manager, how to own module in node.js, local & global packages and how to install node.js in detail.

[n-school]

Reasons To Learn Node.Js For Web Development

https://www.n-school.com/reasons-learn-node-js-web-development/