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jasondavies edited this page Nov 23, 2011
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D3 is a javascript library geared towards visualizations, animations and interactions. Novice and expert users might find useful the answers provided here.
The easiest way is to copy the following text into a file bar.html and play with it.
<!doctype html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<title>bar</title>
<script type="text/javascript" src="http://mbostock.github.com/d3/d3.js"></script>
<style type="text/css">
#chart {
width: 640px;
height: 320px;
border: 1px solid lightgray;
font-size: 12px;
}
#chart .bar {
fill: steelblue;
}
#chart .xaxis {
stroke: black;
}
</style>
</head>
<body>
<div id="chart"></div>
<script type="text/javascript">
var w = 640,
h = 320,
m = [ 15, 5, 15, 5 ], // top, right, bottom, left (ala css)
data = [ { l: "Jan", v: 10 }, { l: "Feb", v: 12 }, { l: "Mar", v: 14 }, { l: "Apr", v: 16 } ];
var x = d3.scale.ordinal().domain(d3.range(data.length))
.rangeBands([0, w - m[1] - m[3]], 0.1),
y = d3.scale.linear().domain([0, d3.max(data, function(d) { return d.v; })])
.range([0, h - m[0] - m[2]]);
var vis = d3.select("#chart")
.append("svg")
.attr("width", w)
.attr("height", h)
.append("g")
.attr("transform", "translate(" + m[3] + "," + m[0] + ")");
vis.selectAll("rect.bar")
.data(data)
.enter().append("rect")
.attr("class", "bar")
.attr("x", function(d, i) { return x(i); })
.attr("y", function(d) { return h - m[0] - m[2] - y(d.v); })
.attr("width", x.rangeBand())
.attr("height", function(d) { return y(d.v); });
vis.selectAll("text.value")
.data(data)
.enter().append("text")
.attr("class", "value")
.attr("x", function(d, i) { return x(i) + x.rangeBand() / 2; })
.attr("y", function(d) { return h - m[0] - m[2] - y(d.v); })
.attr("dy", -2)
.attr("text-anchor", "middle")
.text(function(d) { return d.v; });
vis.selectAll("text.label")
.data(data)
.enter().append("text")
.attr("class", "label")
.attr("x", function(d, i) { return x(i) + x.rangeBand() / 2; })
.attr("y", h - m[0] - m[2] - y(0))
.attr("dy", 12)
.attr("text-anchor", "middle")
.text(function(d) { return d.l; });
vis.append("line")
.attr("class", "xaxis")
.attr("x1", 0)
.attr("x2", w - m[1] - m[3])
.attr("y1", h - m[0] - m[2] - y(0))
.attr("y2", h - m[0] - m[2] - y(0));
</script>
</body>
</html>After you have this working download the library here and setup your testing structure.
You need to add a background <rect> element that fills the area of interest e.g. with fill="#fff". In Safari, mouse events will only fire on <svg> if the mouse is over a child element.