This is the code for Chapter 2, Figure 22 from D3.js in Action that nests data using d3.nest() and then represents the nested data as a bar chart by first computing the length of the nested data arrays and using that length to size the bars by.
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Ch. 2, Fig. 22 - D3.js in Action
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| <html> | |
| <head> | |
| <title>D3 in Action Chapter 2 - Example 10</title> | |
| <meta charset="utf-8" /> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
| </head> | |
| <style> | |
| svg { | |
| height: 500px; | |
| width: 500px; | |
| border: 1px solid gray; | |
| } | |
| </style> | |
| <body> | |
| <div> | |
| <svg> | |
| </svg> | |
| </div> | |
| </body> | |
| <footer> | |
| <script> | |
| d3.json("tweets.json",function(error,data) {dataViz(data.tweets)}); | |
| function dataViz(incomingData) { | |
| var nestedTweets = d3.nest() | |
| .key(function (el) {return el.user}) | |
| .entries(incomingData); | |
| nestedTweets.forEach(function (el) { | |
| el.numTweets = el.values.length | |
| }) | |
| var maxTweets = d3.max(nestedTweets, function(el) {return el.numTweets}); | |
| var yScale = d3.scale.linear().domain([0,maxTweets]).range([0,100]); | |
| d3.select("svg") | |
| .selectAll("rect") | |
| .data(nestedTweets) | |
| .enter() | |
| .append("rect") | |
| .attr("width", 50) | |
| .attr("height", function(d) {return yScale(d.numTweets)}) | |
| .attr("x", function(d,i) {return i * 60}) | |
| .attr("y", function(d) {return 100 - yScale(d.numTweets)}) | |
| .style("fill", "blue") | |
| .style("stroke", "red") | |
| .style("stroke-width", "1px").style("opacity", .25) | |
| } | |
| </script> | |
| </footer> | |
| </html> |
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| { | |
| "tweets": [ | |
| {"user": "Al", "content": "I really love seafood.", "timestamp": " Mon Dec 23 2013 21:30 GMT-0800 (PST)", "retweets": ["Raj","Pris","Roy"], "favorites": ["Sam"]}, | |
| {"user": "Al", "content": "I take that back, this doesn't taste so good.", "timestamp": "Mon Dec 23 2013 21:55 GMT-0800 (PST)", "retweets": ["Roy"], "favorites": []}, | |
| {"user": "Al", "content": "From now on, I'm only eating cheese sandwiches.", "timestamp": "Mon Dec 23 2013 22:22 GMT-0800 (PST)", "retweets": [], "favorites": ["Roy","Sam"]}, | |
| {"user": "Roy", "content": "Great workout!", "timestamp": " Mon Dec 23 2013 7:20 GMT-0800 (PST)", "retweets": [], "favorites": []}, | |
| {"user": "Roy", "content": "Spectacular oatmeal!", "timestamp": " Mon Dec 23 2013 7:23 GMT-0800 (PST)", "retweets": [], "favorites": []}, | |
| {"user": "Roy", "content": "Amazing traffic!", "timestamp": " Mon Dec 23 2013 7:47 GMT-0800 (PST)", "retweets": [], "favorites": []}, | |
| {"user": "Roy", "content": "Just got a ticket for texting and driving!", "timestamp": " Mon Dec 23 2013 8:05 GMT-0800 (PST)", "retweets": [], "favorites": ["Sam", "Sally", "Pris"]}, | |
| {"user": "Pris", "content": "Going to have some boiled eggs.", "timestamp": " Mon Dec 23 2013 18:23 GMT-0800 (PST)", "retweets": [], "favorites": ["Sally"]}, | |
| {"user": "Pris", "content": "Maybe practice some gymnastics.", "timestamp": " Mon Dec 23 2013 19:47 GMT-0800 (PST)", "retweets": [], "favorites": ["Sally"]}, | |
| {"user": "Sam", "content": "@Roy Let's get lunch", "timestamp": " Mon Dec 23 2013 11:05 GMT-0800 (PST)", "retweets": ["Pris"], "favorites": ["Sally", "Pris"]} | |
| ] | |
| } | |
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