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Download E-books Getting Started with GEO, CouchDB, and Node.js PDF

By Mick Thompson

Today's cellular units have GPS and traditional APIs to provide you entry to coordinates—but what are you able to do with that info? With this concise e-book, program builders how one can paintings with position info quick and simply, utilizing Node.js, CouchDB, and different open resource instruments and libraries.

Node.js makes it basic to run occasion code on the net, and the CouchDB document-oriented database allows you to shop situation information and practice complicated queries on it speedy. you will tips on how to start with those instruments, after which use them jointly to construct an instance undertaking referred to as MapChat, utilizing HTML and JavaScript code samples.

  • Learn the right way to serve dynamic content material with Node.js, and use its asynchronous IO to deal with a number of requests at once
  • Become acquainted with GeoJSON, Geohash, and the Geospatial information Abstraction Library (GDAL) for operating with spatial data
  • Build geospatial indexes utilizing the GeoCouch department of CouchDB
  • Combine those instruments to construct a venture that shall we clients put up real-time chat messages tagged with their present map location

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With a subscription, you could learn any web page and watch any video from our library on-line. learn books in your cellphone and cellular units. entry new titles earlier than they're on hand for print, and get specific entry to manuscripts in improvement and submit suggestions for the authors. replica and paste code samples, manage your favorites, obtain chapters, bookmark key sections, create notes, print out pages, and take advantage of a whole lot different time-saving good points. O’Reilly Media has uploaded this ebook to the Safari Books on-line carrier. To have complete electronic entry to this booklet and others on related subject matters from O’Reilly and different publishers, join loose at http://my. safaribooksonline. com. viii | Preface How to touch Us Please handle reviews and questions bearing on this e-book to the writer: O’Reilly Media, Inc. 1005 Gravenstein road North Sebastopol, CA 95472 800-998-9938 (in the U.S. or Canada) 707-829-0515 (international or neighborhood) 707-829-0104 (fax) we've an online web page for this ebook, the place we checklist errata, examples, and any additional info. you could entry this web page at: http://oreilly. com/catalog/97814493075232 To remark or ask technical questions about this ebook, ship e-mail to: bookquestions@oreilly. com for additional information approximately our books, classes, meetings, and information, see our web site at http://www. oreilly. com. locate us on fb: http://facebook. com/oreilly stick with us on Twitter: http://twitter. com/oreillymedia Watch us on YouTube: http://www. youtube. com/oreillymedia Preface | ix CHAPTER 1 Node. js Node. js has quick turn into a really well known asynchronous framework for JavaScript. it really is equipped on best of a similar V8 engine that the Chromium and Google Chrome internet browsers use to interpret JavaScript. With the addition of networking and dossier approach API aid, it has quick proved to be a able software for interacting with IO in a asynchronous method. there are numerous different libraries in numerous different languages which can accomplish an identical asynchronous dealing with of IO. There are various conventions, faculties of concept, and personal tastes of builders. Node. js makes use of callbacks for the developer to notified of the growth of asynchronous operations. Callbacks are not anything new for builders accustom to Python’s Twisted library or different related frameworks. Callbacks could be a really easy and robust option to deal with the circulate of an appilication, yet as with whatever new additionally they supply a chance to journey up a developer. the very first thing to bear in mind while getting all started with asynchronous improvement is that execution will possibly not stick with an analogous squence whenever. Getting begun with Node. js in an effort to set up Node. js, obtain the resource and construct it. the most Node. js website at http://nodejs. org will be very invaluable in linking to downloads, resource code repositories, and documentation. The grasp department of the repository is saved in a semiunstable nation, so ahead of construction try out the newest tagged model. for instance: v0. four. nine. The Node. js package deal supervisor or NPM is an incredibly great tool.

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