Live screencast on my tech blog (fr speaking): http://www.mathieu-elie.net/screencast-video-d3-js-sinatra-elasticsearch-capucine/ other tech slides at my blog: http://www.mathieu-elie.net

1. Data Vizualisationhello
world with:
d3.js + sinatra +
elasticsearch

2. hello world :)
• know this sexy technos exist...
• ... and maybe learn more after ;)

3. d3.js
• http://mbostock.github.com/d3/
• «D3.js is a small, free JavaScript library for
manipulating documents based on data.»

4. 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

5. 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

6. 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; });

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

8. sinatra
• http://www.sinatrarb.com/
• « Sinatra is a DSL for quickly creating web
applications in Ruby with minimal effort »

9. 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....

10. elasticsearch
• http://www.elasticsearch.org/
• fast
• painless setup
• free search schema
• JSON over http
• scale to hundreds

11. elasticsearch
• put json on the index
• search index
• response times are indcrebly fast
• super easy clustering (sharding +
replication)
• and requested by REST / json api

12. elasticsearch
• more elasticsearch pres is possible: just ask
for it ;)

13. 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

14. video
• check !

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