d3wrap.js

function wrap(d) {
    var allowedWidth = (x(d.x + d.dx) - x(d.x))*0.85;
    var self = d3.select(this),
        textLength = self.node().getComputedTextLength(),
        text = self.text();
    while (textLength > allowedWidth && text.length > 0) {
        text = text.slice(0, -1);
        self.text(text + '...');
        textLength = self.node().getComputedTextLength();
    }
}

d3wrapclosure.js

function wrap(allowedWidth, val) {
    var valuePadding = val ? 0.15 : 0;
    return function(d) {
        var pad = 1 - (valuePadding * (d.col == 2 ? 2 : 1));
        var self = d3.select(this),
            textLength = self.node().getComputedTextLength(),
            text = self.text();
        while (textLength > (allowedWidth * pad * 0.80) && text.length > 0) {
            text = text.slice(0, -1);
            self.text(text + '...');
            textLength = self.node().getComputedTextLength();
        }
    };
}

svg.selectAll('g.item text.label')
    .text(function(d) { return d.name })
    .each(wrap(itemWidth, false));

svgTextWrapByWord.js

function wrap(text, width, height, verticalAlign) {
    text.each(function() {
        var words = text.text().split(/\s+/).reverse(),
            word,
            totalHeight,
            line = [],
            lastLine,
            lineNumber = 0,
            lineHeight = 1.1, // ems
            y = text.attr("y"),
            x = text.attr("x"),
            dy = text.attr("dy"),
            tspan = text.text(null).append("tspan").attr("x", x).attr("y", y).attr("dy", "1em");
        while (word = words.pop()) { // while there are still words take off the next
            line.push(word); // add the word
            tspan.text(line.join(" ")); // modify the tspan to match the line
            if (tspan.node().getComputedTextLength() > width) { // if the next word won't fit on the line
                line.pop(); //pull it off
                if(line.length == 0) {lineNumber--};
                tspan.text(line.join(" ")); // recreate the line without the word
                line = [word]; // assign the last word that wouldn't fit to the new line and then assing to new tspan
                tspan = text.append("tspan").attr("x", x).attr("y", y).attr("dy", ++lineNumber * lineHeight + 1 + "em").text(word);
            }
        }
        totalHeight = text.node().getBBox().height;
        while(totalHeight > height) {
            globalText = text;
            text.selectAll("tspan").last().remove();
            totalHeight = text.node().getBBox().height;
        }
        // add ellipsis if over length
        lastLine = text.selectAll("tspan").last();
        lastLine.each( wrapLineClosure(width) );
        totalHeight = text.node().getBBox().height;
        if(verticalAlign) {
            text.attr("transform", "translate(0, " + ((height - totalHeight) / 2) + ")");
        }
    });
}

use.js

d3.selectall('p').text(function(d) { return d}).each(wrap)