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D3 tooltip using SVG title element

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index.html
HTML
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<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="http://mbostock.github.com/d3/d3.js"></script>
</head>
<body>
<div id="chart"></div>
<script type="text/javascript">
 
var w = 800, h = 500;
var colors = d3.scale.category20();
 
var vis = d3.select("#chart").append("svg:svg")
.attr("width", w)
.attr("height", h);
 
var data = d3.range(20).map(function() { return { x:Math.random()*w, y:Math.random()*h, r:Math.random()*30 } });
 
vis.selectAll("circle")
.data(data)
.enter().append("svg:circle")
.attr("stroke", "black")
.attr("fill", function(d, i) { return colors(i); })
.attr("cx", function(d, i) { return d.x; })
.attr("cy", function(d, i) { return d.y; })
.attr("r", function(d, i) { return d.r; })
// Here we add an SVG title element the contents of which is effectively rendered in a tooltip
.append("svg:title")
.text(function(d, i) { return "My color is " + colors(i); });
 
</script>
 
</body>
</html>

Hi,

many thanks for the sample code, one problem that I see in this code as well as in other examples. title element exists in html code however it doesn't display when you run the webpage. Do you have any idea for the reason of that? Maybe it should be styled with css?

I believe it works when one uses svg:group. Any explanation on this would be very useful.

thanks
M.

It seems that it depends on the browser, check out this discussion. So instead of relying on the browsers' interpretation of svg:title it's better to use tooltips drawn manually, like for instance the one in the jQuery tipsy example.

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