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Fetch Statistics from the Yahoo Finance and save it
into a Google Sheet document
• An Engineering Student at the International Institute of Technology
• Article Writer at CodeProject.com
About me
• A powerful platform to let you run JS on the server side• How? Uses Google’s V8 Engine• V8 is built in C• V8 is the fatest JS Engine on the planet• Great way to build modern web apps on both Client and
Server side!
What is Node.js?
Timeline
2009 2010 2011 2012
Jan 2009Created Ryan Dahl
April 2010 Heroku launches node support
Nov 2011 Windows Azure support
EBay releases API built on node
Cloud9IDE azuresupport
Oct 2011 node.js overtakes Ruby as most popular repo on gitHub
Walmart Launch mobile site on node.js
Feb 2012 App Harbour support
July 2011
LinkedIn adopts node for mobile platform
port to Windows
IISNode
July 2010 Yammer adopts node.js
Nov 2010 Cloud9IDE launches
Companies support Node.js
• Yahoo!• Microsoft • LinkedIn• Ebay• Fidelizoo• Paypal• CHESS• …
What Can I Do in Node?
• Anything you want!• Chat servers, Analytics & Crazy fast backends• Socket.io library is a wicked way to build real time apps• Build a social Network! LinkedIn, Dropbox all using Node.js
What Can’t I Do in Node?
• Contradicts previous slide but Node.js is not a web framework i.e Sinatra Modules for node.js make it into web framework i.e Express Node.js is not Multi-threaded A single thread to rule them all
Non-Blocking? Blocking? I’m so confused
• By introducing callbacks. Node can move on to other requests and whenever the callback is called, node will process is.
• You should read non-blocking code as « put function and params in queue and fire callback when you reach the end of the queue »
• Blocking= return Non-Blocking= no return. Only callbacks
Fetch Statistics from the Yahoo Finance
• We have to fetch data from the link shown below:
http://finance.yahoo.com/q/ks?s=LVS
The Company in our example is LVS.
• You need to install Node.js Of course and it 3 packages: npm install request – So we could work with URLs in an easy
way. npm install cheerio – jQuery for the server side. This will make
the code 10x shorter. npm install edit-google-spreadsheet – to integrate with
Google docs/sheets with 2-3 lines of code.
Fetch Statistics from the Yahoo Finance
Fetch Statistics from the Yahoo Finance
• // Some parameters • var ticker = "LVS";• var yUrl = "http://finance.yahoo.com/q/ks?s=" + ticker;• var financeDetails = new Array();• var keyStr = new Array();
• // The main call to fetch the data, parse it and work on it.
• request(yUrl, function (error, response, body) {• if (!error && response.statusCode == 200) {• var $ = cheerio.load(body);• // the keys - We get them from a certain class attribute• var td = $('.yfnc_tablehead1');• $(td).each(function(j, val) {• keyStr[j] = $(val).text();• });
Fetch Statistics from the Yahoo Finance
Working with Google Sheet Document
• // upload our data to Google sheet• Spreadsheet.create({• debug: true,• username: 'TODO-fill',• password: 'TODO-fill',• debug: true,• spreadsheetName: 'TODO-yourSheetName',• worksheetName: 'TODO-Sheet1orAbetterName',• callback: sheetReady• });
Demo
Thank you