How do I include newlines in labels in D3 charts?

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I ended up using the following code to break each x-axis label across lines:

var insertLinebreaks = function (d) {
    var el = d3.select(this);
    var words = d.split(' ');
    el.text('');

    for (var i = 0; i < words.length; i++) {
        var tspan = el.append('tspan').text(words[i]);
        if (i > 0)
            tspan.attr('x', 0).attr('dy', '15');
    }
};

svg.selectAll('g.x.axis g text').each(insertLinebreaks);

Note that this assumes that the labels have already been created. (If you follow the canonical histogram example then the labels will have been set up in just the way you need.) There also isn’t any real line-breaking logic present; the function converts every space into a newline. This fits my purposes fine but you may need to edit the split() line to be smarter about how it partitions the parts of the string into lines.

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