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Simple bar chart
Raw
README.md

This is an example of a simple bar chart. Most beginners to d3 will build one of these charts at some point.

See http://www.puzzlr.org/?p=25 for the thought process behind this graph.

Raw
index.html
<!DOCTYPE html>
<meta charset="utf-8">
<html>
<head>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="http://labratrevenge.com/d3-tip/javascripts/d3.tip.v0.6.3.js"></script>
<style>
body {
font: 16px sans-serif;
font-weight: bold;
}
.bar {
fill: steelblue;
}
.bar:hover {
fill: purple;
}
.axis {
font: 10px sans-serif;
}
.axis path, /* path refers to a line */
.axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
.x.axis path {
display: none;
}
.title {
font: 20px sans-serif;
font-weight: bold;
}
/* tooltip CSS */
.d3-tip {
line-height: 1;
font-weight: bold;
padding: 12px;
background: rgba(0, 0, 0, 0.8);
color: #fff;
border-radius: 2px;
}
.d3-tip:after {
box-sizing: border-box;
display: inline;
font-size: 10px;
width: 100%;
line-height: 1;
color: rgba(0, 0, 0, 0.8);
content: "\25BC";
position: absolute;
text-align: center;
}
/* Style northward tooltips differently */
.d3-tip.n:after {
margin: -1px 0 0 0;
top: 100%;
left: 0;
}
</style>
</head>
<body>
<script>
var margin = {
top: 30,
left: 65,
right: 20,
bottom: 50
}
height = 400 - margin.top - margin.bottom
width = 600 - margin.left - margin.right
var svg = d3.select("body").append("svg")
.attr("height", height + margin.top + margin.bottom)
.attr("width", width + margin.left + margin.right)
.append("g") //investigate the effects of removing this
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
//xAxis
var xScale = d3.scale.ordinal()
.rangeRoundBands([width,0], .1);
var xAxis = d3.svg.axis()
.scale(xScale)
.orient("bottom");
var yScale = d3.scale.linear()
.range([height,0])
var yAxis = d3.svg.axis()
.scale(yScale)
.orient("left")
//we use Tickformat to round our high numbers accordingly
.tickFormat(function(d) {
if ( (d/100000000) >= 1 ) {
d = d/1000000000
}
return d;
});
var tip = d3.tip()
.attr("class","d3-tip")
.html(function (d) {
return "<strong>% of World Pop:</strong> <span style='color:red'>" + d.Penetration + "</span>";
});
svg.call(tip);
d3.csv("internet_users.csv",type, function(data) {
xScale.domain(data.map(function(d) {return d.Year;}));
yScale.domain([0, d3.max(data, function(d) { return +d["Internet Users"]; } )]);
//xAxis
svg.append("g")
.attr("class","x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis)
.selectAll("text")
.style("text-anchor", "end")
.attr("dx", "-.8em")
.attr("dy", ".15em")
.attr("transform", "rotate(-35)");
//yAxis
svg.append("g")
.attr("class","y axis")
.call(yAxis);
//x axis label
svg.append("text")
.attr("x", width/2)
.attr("y", height + margin.bottom)
.text("Year");
//y axis label
svg.append("text")
.attr("transform", "rotate(-90)")
//NOTE - we actually rotate our reference point by 90 degrees
//http://www.d3noob.org/2012/12/adding-axis-labels-to-d3js-graph.html gives more detail
.attr("y", 0 - margin.left)
.attr("x",0 - (height / 2))
.attr("dy", "1em")
.style("text-anchor", "middle")
.text("Number of Users (billions)");
//title
svg.append("g")
.attr("class","title")
.append("text")
.attr("x", width/2)
.attr("y", (margin.top / 2))
.attr("text-anchor", "middle")
.text("Internet users over time")
svg.selectAll(".bar")
.data(data)
.enter()
.append("rect")
.attr("class", "bar")
.attr("x", function(d) {return xScale(d.Year);})
.attr("y", function(d) {return yScale(d["Internet Users"]); })
.attr("width",xScale.rangeBand())
.attr("height", function (d) {return height - yScale(d["Internet Users"]); })
//show and hide tooltip
.on("mouseover", tip.show)
.on("mouseout", tip.hide) ;
});
function type(d) {
d.Penetration = d.Penetration;
return d;
}
</script>
</body>
</html>
Raw
internet_users.csv
Year Internet Users Penetration World Population Non-Users (Internetless) 1Y User Change 1Y User  Change World Pop. Change
2016 3424971237 46.10% 7432663275 4007692038 7.50% 238975082 1.13%
2015 3185996155 43.40% 7349472099 4163475944 7.80% 229610586 1.15%
2014 2956385569 40.70% 7265785946 4309400377 8.40% 227957462 1.17%
2013 2728428107 38% 7181715139 4453287032 9.40% 233691859 1.19%
2012 2494736248 35.10% 7097500453 4602764205 11.80% 262778889 1.20%
2011 2231957359 31.80% 7013427052 4781469693 10.30% 208754385 1.21%
2010 2023202974 29.20% 6929725043 4906522069 14.50% 256799160 1.22%
2009 1766403814 25.80% 6846479521 5080075707 12.10% 191336294 1.22%
2008 1575067520 23.30% 6763732879 5188665359 14.70% 201840532 1.23%
2007 1373226988 20.60% 6681607320 5308380332 18.10% 210310170 1.23%
2006 1162916818 17.60% 6600220247 5437303429 12.90% 132815529 1.24%
2005 1030101289 15.80% 6519635850 5489534561 12.80% 116773518 1.24%
2004 913327771 14.20% 6439842408 5526514637 16.90% 131891788 1.24%
2003 781435983 12.30% 6360764684 5579328701 17.50% 116370969 1.25%
2002 665065014 10.60% 6282301767 5617236753 32.40% 162772769 1.26%
2001 502292245 8.10% 6204310739 5702018494 21.10% 87497288 1.27%
2000 414794957 6.80% 6126622121 5711827164 47.30% 133257305 1.28%
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