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Data Vizualisationhello
     world with:

   d3.js + sinatra +
    elasticsearch
hello world :)


• know this sexy technos exist...
• ... and maybe learn more after ;)
d3.js
• http://mbostock.github.com/d3/
• «D3.js is a small, free JavaScript library for
  manipulating documents based on data.»
d3.js
• data([4, 8, 15, 16, 23, 42])
• array of document elements (<p>)
• data[i] <=> elements[i] -> each element of
  the data array is binded to an element of
  the document
d3.js
• #repeat : each element of the data array is
  binded to an element of the document
• foreach item of my data array:
• .enter().append("p").text(function(d)
  { return "I'm number " + d + "!"; });
• i build a <p> el and set a text with the data
  value
d3.js
• circle.exit().remove();
• when data element is removed, i just the
    remove the same index element from the
    dom
• if data data value is updated ? transition +
    svg!
•    rect.transition().duration(1000).attr("x",
    function(d, i) { return x(i) - .5; });
d3.js


• more d3.js pres is possible: just ask for it ;)
sinatra


• http://www.sinatrarb.com/
• « Sinatra is a DSL for quickly creating web
  applications in Ruby with minimal effort »
sinatra
• quick web application without persistence
   and so on (but you can too ;))
• data viz with static js / css / html
• proxy to api (here we have a proxy to the
   elastic search api)
• make call to facebook / oauth api and get
   token for debug....
• etc....
elasticsearch
• http://www.elasticsearch.org/
• fast
• painless setup
• free search schema
• JSON over http
• scale to hundreds
elasticsearch
• put json on the index
• search index
• response times are indcrebly fast
• super easy clustering (sharding +
  replication)
• and requested by REST / json api
elasticsearch


• more elasticsearch pres is possible: just ask
  for it ;)
the app
    js
   d3.js              sinatra           elasticsearch

   ajax

   javascript
                   sinatra really
 contain main                       elasticsearch
                     handy for
   part of app                      accessed via
                   proxying with
vizualiation and                         http
                     REST api
 http querying
video


• check !
Matt


• twitter @mathieuel
• http://www.mathieu-elie.net

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Data vizualisation: d3.js + sinatra + elasticsearch