score:3

Accepted answer

You didn't tell us exactly how it is not working. So, I'd guess the problem is the unary plus operator being used with strings... if my assumption is correct, you're probably seeing a NaN in the title.

Anyway, these are the steps:

First, add the field in the CSV:

source,target,value,info
Barry,Elvis,2,foo
Frodo,Elvis,2,bar
Frodo,Sarah,2,baz
Barry,Alice,2,foobar
Elvis,Sarah,2,foobaz
Elvis,Alice,2,barbar
Sarah,Alice,4,barbaz

Then, push the property in the links, without the unary plus:

data.forEach(function(d) {
    graph.nodes.push({
        "name": d.source
    });
    graph.nodes.push({
        "name": d.target
    });
    graph.links.push({
        "source": d.source,
        "target": d.target,
        "value": +d.value,
        "information": d.info
    });
});

Finally, get the property in the title:

link.append("title")
    .text(function(d) {
        return d.source.name + " → " +
            d.target.name + "\n" + format(d.value) + ", Information: " + d.information
    });

Here is the updated bl.ocks: http://bl.ocks.org/anonymous/5652b4a53cd73f0b3a493b400ec4e1b3/2cdf75a83dc79946722f975144c0ce892836a15a


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