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Ch. 2, Fig. 27 - D3.js in Action
Raw
readme.md

This is the code for Chapter 2, Figure 27 from D3.js in Action demonstrating D3's .exit() behavior that removes elements for which there are not corresponding datapoints in the selection's bound data array.

Raw
index.html
<html>
<head>
<title>D3 in Action Chapter 2 - Example 13</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) {
incomingData.forEach(function (el) {
el.impact = el.favorites.length + el.retweets.length
el.tweetTime = new Date(el.timestamp);
})
var maxImpact = d3.max(incomingData, function(el) {return el.impact});
var startEnd = d3.extent(incomingData, function(el) {return el.tweetTime});
var timeRamp = d3.time.scale().domain(startEnd).range([50,450]);
var yScale = d3.scale.linear().domain([0,maxImpact]).range([0,460]);
var radiusScale = d3.scale.linear().domain([0,maxImpact]).range([1,20]);
d3.select("svg")
.selectAll("circle")
.data(incomingData, function(d) {return JSON.stringify(d)})
.enter()
.append("circle")
.attr("r", function(d) {return radiusScale(d.impact)})
.attr("cx", function(d,i) {return timeRamp(d.tweetTime)})
.attr("cy", function(d) {return 480 - yScale(d.impact)})
.style("fill", "#990000")
.style("stroke", "black")
.style("stroke-width", "1px");
var filteredData = incomingData.filter(
function(el) {return el.impact > 0}
);
d3.selectAll("circle")
.data(filteredData, function(d) {return JSON.stringify(d)})
.exit()
.remove();
}
</script>
</footer>
</html>
Raw
tweets.json
{
"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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