为 D3.js 树形图标签添加自动换行

Question

I'm new to D3.js and want to wrap long labels in the tree chart

Can someone guide me how to do this?

Here is what I've tried:

var insertLinebreaks = function (t, d, width) {
    var el = d3.select(t);
    var p = d3.select(t.parentNode);
    p.append("foreignObject")
        .attr('x', -width/2)
        .attr("width", width)
        .attr("height", 200)
      .append("xhtml:p")
        .attr('style','word-wrap: break-word; text-align:center;')
        .html(d);    

    el.remove();
};

var svg = d3.select("body").append("svg")
    .attr("width", width + margin.right + margin.left)
    .attr("height", height + margin.top + margin.bottom)
    .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

    svg.selectAll('text')
    .each(function(d,i){ insertLinebreaks(this, d, 10 ); });

Answer 1

I managed to make it work. Thanks to this sample

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
        y = text.attr("y"),
        dy = parseFloat(text.attr("dy"))/2,
        tspan = text.text(null).append("tspan").attr("x", 0).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", 0).attr("y", y).attr("dy", ++lineNumber * lineHeight + dy + "em").text(word);
      }
    }
  });
}

var json = 
{
    "name": "Base",
    "children": [
        {
            "name": "I have a very long sentence that needs to be broken up",
            "children": [
                {
                    "name": "Section 1",
                    "children": [
                        {"name": "Child 1"},
                        {"name": "Child 2"},
                        {"name": "Child 3"}
                    ]
                },
                {
                    "name": "Section 2",
                    "children": [
                        {"name": "Child 1"},
                        {"name": "Child 2"},
                        {"name": "Child 3"}
                    ]
                }
            ]
        },
        {
            "name": "Either you break this up or one of us is in deep trouble",
            "children": [
                {
                    "name": "Section 1",
                    "children": [
                        {"name": "Child 1"},
                        {"name": "Child 2"},
                        {"name": "Child 3"}
                    ]
                },
                {
                    "name": "Section 2",
                    "children": [
                        {"name": "Child 1"},
                        {"name": "Child 2"},
                        {"name": "Child 3"}
                    ]
                }
            ]
        }
    ]
};

var width = 700;
var height = 650;
var maxLabel = 150;
var duration = 500;
var radius = 5;
    
var i = 0;
var root;

var tree = d3.layout.tree()
    .size([height, width]);

var diagonal = d3.svg.diagonal()
    .projection(function(d) { return [d.y, d.x]; });

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
        .append("g")
        .attr("transform", "translate(" + maxLabel + ",0)");

root = json;
root.x0 = height / 2;
root.y0 = 0;

root.children.forEach(collapse);

function update(source) 
{
    // Compute the new tree layout.
    var nodes = tree.nodes(root).reverse();
    var links = tree.links(nodes);

    // Normalize for fixed-depth.
    nodes.forEach(function(d) { d.y = d.depth * maxLabel; });

    // Update the nodes…
    var node = svg.selectAll("g.node")
        .data(nodes, function(d){ 
            return d.id || (d.id = ++i); 
        });

    // Enter any new nodes at the parent's previous position.
    var nodeEnter = node.enter()
        .append("g")
        .attr("class", "node")
        .attr("transform", function(d){ return "translate(" + source.y0 + "," + source.x0 + ")"; })
        .on("click", click);

    nodeEnter.append("circle")
        .attr("r", 0)
        .style("fill", function(d){ 
            return d._children ? "lightsteelblue" : "white"; 
        });

    nodeEnter.append("text")
        .attr("x", function(d){ 
            var spacing = computeRadius(d) + 5;
            return d.children || d._children ? -spacing : spacing; 
        })
        .attr("dy", "3")
        .attr("text-anchor", function(d){ return d.children || d._children ? "end" : "start"; })
        .text(function(d){ return d.name; })
        .style("fill-opacity", 0);

    // Transition nodes to their new position.
    var nodeUpdate = node.transition()
        .duration(duration)
        .attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; });

    nodeUpdate.select("circle")
        .attr("r", function(d){ return computeRadius(d); })
        .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

    nodeUpdate.select("text").style("fill-opacity", 1);
    nodeUpdate.select("text").call(wrap, 200); // <++++++++++ wrap it!
    // Transition exiting nodes to the parent's new position.
    var nodeExit = node.exit().transition()
        .duration(duration)
        .attr("transform", function(d) { return "translate(" + source.y + "," + source.x + ")"; })
        .remove();

    nodeExit.select("circle").attr("r", 0);
    nodeExit.select("text").style("fill-opacity", 0);

    // Update the links…
    var link = svg.selectAll("path.link")
        .data(links, function(d){ return d.target.id; });

    // Enter any new links at the parent's previous position.
    link.enter().insert("path", "g")
        .attr("class", "link")
        .attr("d", function(d){
            var o = {x: source.x0, y: source.y0};
            return diagonal({source: o, target: o});
        });

    // Transition links to their new position.
    link.transition()
        .duration(duration)
        .attr("d", diagonal);

    // Transition exiting nodes to the parent's new position.
    link.exit().transition()
        .duration(duration)
        .attr("d", function(d){
            var o = {x: source.x, y: source.y};
            return diagonal({source: o, target: o});
        })
        .remove();

    // Stash the old positions for transition.
    nodes.forEach(function(d){
        d.x0 = d.x;
        d.y0 = d.y;
    });
}

function computeRadius(d)
{
    if(d.children || d._children) return radius + (radius * nbEndNodes(d) / 10);
    else return radius;
}

function nbEndNodes(n)
{
    nb = 0;    
    if(n.children){
        n.children.forEach(function(c){ 
            nb += nbEndNodes(c); 
        });
    }
    else if(n._children){
        n._children.forEach(function(c){ 
            nb += nbEndNodes(c); 
        });
    }
    else nb++;
    
    return nb;
}

function click(d)
{
    if (d.children){
        d._children = d.children;
        d.children = null;
    } 
    else{
        d.children = d._children;
        d._children = null;
    }
    update(d);
}

function collapse(d){
    if (d.children){
        d._children = d.children;
        d._children.forEach(collapse);
        d.children = null;
    }
}

update(root);

Answer 2

Full code:

 <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Tree Example</title> <style> .node { cursor: pointer; } .node circle { fill: #fff; stroke: steelblue; stroke-width: 3px; } .node text { font: 12px sans-serif; } .link { fill: none; stroke: #ccc; stroke-width: 2px; } </style> </head> <body> <!-- load the d3.js library --> <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js"></script> <script> 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 y = text.attr("y"), dy = parseFloat(text.attr("dy"))/2, tspan = text.text(null).append("tspan").attr("x", 0).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", 0).attr("y", y).attr("dy", ++lineNumber * lineHeight + dy + "em").text(word); } } }); } var json = { "name": "Base", "children": [ { "name": "I have a very long sentence that needs to be broken up", "children": [ { "name": "Section 1", "children": [ {"name": "Child 1"}, {"name": "Child 2"}, {"name": "Child 3"} ] }, { "name": "Section 2", "children": [ {"name": "Child 1"}, {"name": "Child 2"}, {"name": "Child 3"} ] } ] }, { "name": "Either you break this up or one of us is in deep trouble", "children": [ { "name": "Section 1", "children": [ {"name": "Child 1"}, {"name": "Child 2"}, {"name": "Child 3"} ] }, { "name": "Section 2", "children": [ {"name": "Child 1"}, {"name": "Child 2"}, {"name": "Child 3"} ] } ] } ] }; var width = 700; var height = 650; var maxLabel = 150; var duration = 500; var radius = 5; var i = 0; var root; var tree = d3.layout.tree() .size([height, width]); var diagonal = d3.svg.diagonal() .projection(function(d) { return [dy, dx]; }); var svg = d3.select("body").append("svg") .attr("width", width) .attr("height", height) .append("g") .attr("transform", "translate(" + maxLabel + ",0)"); root = json; root.x0 = height / 2; root.y0 = 0; root.children.forEach(collapse); function update(source) { // Compute the new tree layout. var nodes = tree.nodes(root).reverse(); var links = tree.links(nodes); // Normalize for fixed-depth. nodes.forEach(function(d) { dy = d.depth * maxLabel; }); // Update the nodes… var node = svg.selectAll("g.node") .data(nodes, function(d){ return d.id || (d.id = ++i); }); // Enter any new nodes at the parent's previous position. var nodeEnter = node.enter() .append("g") .attr("class", "node") .attr("transform", function(d){ return "translate(" + source.y0 + "," + source.x0 + ")"; }) .on("click", click); nodeEnter.append("circle") .attr("r", 0) .style("fill", function(d){ return d._children ? "lightsteelblue" : "white"; }); nodeEnter.append("text") .attr("x", function(d){ var spacing = computeRadius(d) + 5; return d.children || d._children ? -spacing : spacing; }) .attr("dy", "3") .attr("text-anchor", function(d){ return d.children || d._children ? "end" : "start"; }) .text(function(d){ return d.name; }) .style("fill-opacity", 0); // Transition nodes to their new position. var nodeUpdate = node.transition() .duration(duration) .attr("transform", function(d) { return "translate(" + dy + "," + dx + ")"; }); nodeUpdate.select("circle") .attr("r", function(d){ return computeRadius(d); }) .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; }); nodeUpdate.select("text").style("fill-opacity", 1); nodeUpdate.select("text").call(wrap, 200); // <++++++++++ wrap it! // Transition exiting nodes to the parent's new position. var nodeExit = node.exit().transition() .duration(duration) .attr("transform", function(d) { return "translate(" + source.y + "," + source.x + ")"; }) .remove(); nodeExit.select("circle").attr("r", 0); nodeExit.select("text").style("fill-opacity", 0); // Update the links… var link = svg.selectAll("path.link") .data(links, function(d){ return d.target.id; }); // Enter any new links at the parent's previous position. link.enter().insert("path", "g") .attr("class", "link") .attr("d", function(d){ var o = {x: source.x0, y: source.y0}; return diagonal({source: o, target: o}); }); // Transition links to their new position. link.transition() .duration(duration) .attr("d", diagonal); // Transition exiting nodes to the parent's new position. link.exit().transition() .duration(duration) .attr("d", function(d){ var o = {x: source.x, y: source.y}; return diagonal({source: o, target: o}); }) .remove(); // Stash the old positions for transition. nodes.forEach(function(d){ d.x0 = dx; d.y0 = dy; }); } function computeRadius(d) { if(d.children || d._children) return radius + (radius * nbEndNodes(d) / 10); else return radius; } function nbEndNodes(n) { nb = 0; if(n.children){ n.children.forEach(function(c){ nb += nbEndNodes(c); }); } else if(n._children){ n._children.forEach(function(c){ nb += nbEndNodes(c); }); } else nb++; return nb; } function click(d) { if (d.children){ d._children = d.children; d.children = null; } else{ d.children = d._children; d._children = null; } update(d); } function collapse(d){ if (d.children){ d._children = d.children; d._children.forEach(collapse); d.children = null; } } update(root); </script> </body> </html>