Wrapping Text in D3
css, d3.js, javascript
Solution
You can modify Mike Bostock's "Wrapping Long Labels" example to add `<tspan>` elements to your `<text>` nodes. There are two major changes required to add wrapped text to your nodes. I didn't delve into having the text update its position during transitions, but it shouldn't be too hard to add.
The first is to add a function `wrap`, based off of the function in the above example. `wrap` will take care of adding `<tspan>` elements to make your text fit within a certain width:
function wrap(text, width) {
text.each(function () {
var text = d3.select(this),
words = text.text().split(/\s+/).reverse(),
word,
line = [],
lineNumber = 0,
lineHeight = 1.1, // ems
x = text.attr("x"),
y = text.attr("y"),
dy = 0, //parseFloat(text.attr("dy")),
tspan = text.text(null)
.append("tspan")
.attr("x", x)
.attr("y", y)
.attr("dy", dy + "em");
while (word = words.pop()) {
line.push(word);
tspan.text(line.join(" "));
if (tspan.node().getComputedTextLength() > width) {
line.pop();
tspan.text(line.join(" "));
line = [word];
tspan = text.append("tspan")
.attr("x", x)
.attr("y", y)
.attr("dy", ++lineNumber * lineHeight + dy + "em")
.text(word);
}
}
});
}
The second change is that instead of setting the text of each node, you need to call `wrap` for each node:
// Add entering nodes in the parent’s old position.
node.enter().append("text")
.attr("class", "node")
.attr("x", function (d) { return d.parent.px; })
.attr("y", function (d) { return d.parent.py; })
.text("Foo is not a long word")
.call(wrap, 30); // wrap the text in <= 30 pixels
Problem
I would like to get the text to wrap on the following D3 tree so that instead of ``` Foo is not a long word ``` each line is wrapped to ``` Foo is not a long word ``` I have tried making the text a 'foreignObject' rather than a text object and the text does indeed wrap, but it doesn't move on the tree animation and is all grouped in the upper left hand corner. Code located at http://jsfiddle.net/mikeyai/X43X5/1/ Javascript: ``` var width = 960, height = 500; var tree = d3.layout.tree() .size([width - 20, height - 20]); var root = {}, nodes = tree(root); root.parent = root; root.px = root.x; root.py = root.y; var diagonal = d3.svg.diagonal(); var svg = d3.select("body").append("svg") .attr("width", width) .attr("height", height) .append("g") .attr("transform", "translate(10,10)"); var node = svg.selectAll(".node"), link = svg.selectAll(".link"); var duration = 750, timer = setInterval(update, duration); function update() { if (nodes.length >= 500) return clearInterval(timer); // Add a new node to a random parent. var n = {id: nodes.length}, p = nodes[Math.random() * nodes.length | 0]; if (p.children) p.children.push(n); else p.children = [n]; nodes.push(n); // Recompute the layout and data join. node = node.data(tree.nodes(root), function(d) { return d.id; }); link = link.data(tree.links(nodes), function(d) { return d.source.id + "-" + d.target.id; }); // Add entering nodes in the parent’s old position. node.enter().append("text") .attr("class", "node") .attr("x", function(d) { return d.parent.px; }) .attr("y", function(d) { return d.parent.py; }) .text('Foo is not a long word'); // Add entering links in the parent’s old position. link.enter().insert("path", ".node") .attr("class", "link") .attr("d", function(d) { var o = {x: d.source.px, y: d.source.py}; return diagonal({source: o, target: o}); }); // Transition nodes and links to their new positions. var t = svg.transition() .duration(duration); t.selectAll(".link") .attr("d", diagonal); t.selectAll(".node") .attr("x", function(d) { return d.px = d.x; }) .attr("y", function(d) { return d.py = d.y; }); } ```