How to Scrape Web Pages with Node.js and jQuery. Node.js is growing rapidly; one of the biggest reasons for this is thanks to the developers who create amazing tools that significantly improve productivity with Node. In this article, we will go through the basic installation of Express, a development framework, and creating a basic project with it. What We're Going to Build Today Node is similar in design to, and influenced by, systems like Ruby's Event Machine or Python's Twisted.
Node takes the event model a bit further - it presents the event loop as a language construct instead of as a library. In this tutorial, we will scrape the YouTube home page, get all the regular sized thumbnails from the page as well as links and video duration time, send all those elements to a jQueryMobile template, and play the videos using YouTube embed (which does a nice job of detecting device media support (flash/html5-video).
You should also refer to our "Node.js: Step by Step" series. Step 1: Setting Up Express So what exactly is Express? Request app.js. Multithreading - What is the Haskell response to Node.js. Npm registry. Nowjs for Node - Directly call remote functions in Javascript. Joyent Node.js Workup: Office Hours. Felix's Node.js Convincing the boss guide. « Home / All Guides Now that you're all hyped up about using node.js, it's time to convince your boss. Well, maybe. I have had the pleasure of consulting for different businesses on whether node.js is the right technology, and sometimes the answer is simply no. So this guide is my opinionated collection of advice for those of you that want to explore whether node.js makes sense for their business, and if so, how to convince the management.
Bad Use Cases CPU heavy apps Even though I love node.js, there are several use cases where it simply doesn't make sense. That being said, node.js allows you to easily write C++ addons, so you could certainly use it as a scripting engine on top of your super-secret algorithms. Simple CRUD / HTML apps While node.js will eventually be a fun tool for writing all kinds of web applications, you shouldn't expect it to provide you with more benefits than PHP, Ruby or Python at this point. NoSQL + Node.js + Buzzword Bullshit Good Use Cases JSON APIs Single page apps.
Build Desktop Apps with Node.js Using WebApp. Node.js contributor Tim Caswell pushed an initial release of WebApp Topcube, a framework for building desktop GUI apps with Node.js, to GitHub. The stated goal is to "Give node developers a way to have a desktop GUI to their node servers using HTML5 + CSS3 as the GUI platform. " It's still very early in the project's life - Caswell notes that he's not even sure he will continue developing it.
WebApp is currently built on WebKitGTK+. Caswell also has a GitHub repository for a project called node-gir, which he describes as: Node-gir is node bindings to the girepository library making it possible to make automatic and dynamic calls to any library that has GI annotations installed. This would require you to know some C to build applications, though. Caswell works for HP on WebOS, and also runs HowtoNode. First steps with Node.js. With a colleague I was talking about Node.js. My first though, “yeah right, JavaScript on the server!”. But you have to be open minded if you want to learn new stuff. Therefore I thought about giving it a spin. I started looking for resources on the web, read a few of them and ended up at the article : express-mongo. This article was the beginning of my Node.js journey. In this blog item I want to show you the steps I took, the resources I found useful and some improvements to the article that seems a bit outdated.
The source I took the sources from the article of Ciaran Jessup as my basis. Setting up my environment If you want to do something with nodejs, you have to install it first. Sudo port install nodejs The next step is to install a package manager. . # sudo npm install express # sudo npm install jade # sudo npm install sass Time to check if your environment works, try to execute the famous HelloWorld sample. The sample Express Jade Sass Concluding. MapRejuice | Distributed Computing via Javascript. Socket.IO: the cross-browser WebSocket for realtime apps. Learning Node.js « JTeam Blog / JTeam: Enterprise Java, Open Source, software solutions, Amsterdam. For projects and for some experiments I want to get a better way to do server push.
With the new HTML 5 becoming the standard and therefore WebSockets becoming available in all mayor browsers, it seems that WebSockets is the way forward. A very nice implementation of WebSockets that is backwards compatible with older browsers is available through Socket.io. This is a Node.js library. Node.js brings JavaScript to the server. If you are as sceptic about this as I was, stay with me, you will like it after trying. Within this blog post I want to share some of the things I learned while creating a sample application. In my previous post on gridshore I wrote about Node.js. The sample The sample I am creating is just to show of some features of Node.js. The sample mainly focusses on a chat application.
Introducing Node.js Node.js is all about efficiently handling request. Node.js can be used with a package manager called npm. Building or installing Setting up the project. Scraping the web with Node.io | Coderholic. Node.io is a relatively new screen scraping framework that allows you to easily scrape data from websites using Javascript, a language that I think is perfectly suited to the task. It's built on top of Node.js, but you don't need to know any Node.js to get started, and can run your node.io jobs straight from the command line. The existing documentation is pretty good, and includes a few detailed examples, such as the one below that returns the number of google search results for some given keywords: Running this from the command line gives you the following output: $ node.io google.js hello has about 878,000,000 results foobar has about 2,630,000 results weather has about 719,000,000 results OK: Job complete Scraping Multiple Pages Unfortunately some of the documentation simply says coming soon, so you're left to guess the best way to put together more advanced scraping workflows.
While my solution works I'm sure it's not optimal. There's lots more than node.io can do. The Node Beginner Book. Express - node web framework. 6 Free E-Books and Tutorials for Learning and Mastering Node.js. OK, we won’t bore you by telling you what Node.js is again or why it’s so dang hot. You want to learn Node.js? There’s no completely finished Node.js book out there that we’re aware of. But there’s one complete book in rough draft form, two partial guides and several other great resources for learning Node.js.
No more excuses: Try Node.js for $0.02 or less in just a few minutes No more excuses: Try Node.js for $0.02 or less in just a few minutes is a short tutorial from the developers of NowJS. Up and Running With Node.js Up and Running with Node.js by Tom Hughes-Croucher hasn’t been officially released yet, but O’Reilly Media has released a free text preview of the book as part of its Open Feedback Publishing System. Our previous coverage of the book is here.
The Node Beginner Book The Node Beginner Book by by Manuel Kiessling is a new Node.js e-book. Felix’s Node.js Guide Felix’s Node.js Guide got a lot of attention this week, particularly the Convincing The Boss section. Mastering Node. OpenSSL memory use in Node.js | Paul's Journal. Last Thursday I went to the Joyent office for Node Office Hours -- I wanted to talk to Isaac about running a private NPM registry. Isaac answered my questions about private NPM registries, but Matt Ranney explained a more interesting problem. He was dialed into a conference call line for Node Office hours (he is currently living in Hawaii.) Matt explained that he is using the new TLS module in Node v0.4, and it was using 1 megabyte of memory per connection! Using 1mb per connection made us think there must be something wrong in Node.js itself, so we wrote up a simple test case client and server. The TLS server says "welcome" to a newly connected client, and then echos anything it receives back to the client: The client spawns 200 connections, and writes 'hello' to the server every 5 seconds for each connection: Running the client and server on my laptop, the server used almost 200 megabytes of memory.
Those Pesky Certificate Authority Certificates Zlib: Big Buffers "R" us Conclusion Share.