| license: gpl-3.0 |
This is a fork of Mike Bostock's Block/Gist showing how to wrap long labels in D3. However, I've adapted it to use D3 v4 (latest version of D3 at time of writing).
This demonstration uses satirical data from The Onion.
The changes to Bostock's code are not substantial.
function declarations with easier-to-read arrow functions.| name | value | |
|---|---|---|
| Family in feud with Zuckerbergs | .17 | |
| Committed 671 birthdays to memory | .19 | |
| Ex is doing too well | .10 | |
| High school friends all dead now | .15 | |
| Discovered how to “like” things mentally | .27 | |
| Not enough politics | .12 |
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .bar { | |
| fill: steelblue; | |
| } | |
| .bar:hover { | |
| fill: brown; | |
| } | |
| .title { | |
| font: bold 14px "Helvetica Neue", Helvetica, Arial, sans-serif; | |
| } | |
| .axis { | |
| font: 10px sans-serif; | |
| } | |
| .axis path, | |
| .axis line { | |
| fill: none; | |
| stroke: #000; | |
| shape-rendering: crispEdges; | |
| } | |
| .x.axis path { | |
| display: none; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var margin = {top: 80, right: 180, bottom: 80, left: 180}, | |
| width = 960 - margin.left - margin.right, | |
| height = 500 - margin.top - margin.bottom | |
| var x = d3.scaleBand() | |
| .range([0, width]) | |
| .paddingInner(.1) | |
| .paddingOuter(.3) | |
| var y = d3.scaleLinear() | |
| .range([height, 0]) | |
| var xAxis = d3.axisBottom(x) | |
| var yAxis = d3.axisLeft(y) | |
| .ticks(8, "%") | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", `translate(${margin.left}, ${margin.top})`) | |
| d3.tsv("data.tsv", d => { d.value = +d.value; return d }, function(error, data) { | |
| x.domain(data.map(d => d.name)) | |
| y.domain([0, d3.max(data, d => d.value)]) | |
| svg.append("text") | |
| .attr("class", "title") | |
| .attr("x", x(data[0].name)) | |
| .attr("y", -26) | |
| .text("Why Are We Leaving Facebook?") | |
| svg.append("g") | |
| .attr("class", "x axis") | |
| .attr("transform", `translate(0, ${height})`) | |
| .call(xAxis) | |
| .selectAll(".tick text") | |
| .call(wrap, x.bandwidth()) | |
| svg.append("g") | |
| .attr("class", "y axis") | |
| .call(yAxis) | |
| svg.selectAll(".bar") | |
| .data(data) | |
| .enter().append("rect") | |
| .attr("class", "bar") | |
| .attr("x", d => x(d.name)) | |
| .attr("width", x.bandwidth()) | |
| .attr("y", d => y(d.value)) | |
| .attr("height", d => height - y(d.value)) | |
| }) | |
| function wrap(text, width) { | |
| text.each(function() { | |
| var text = d3.select(this), | |
| words = text.text().split(/\s+/).reverse(), | |
| word, | |
| line = [], | |
| lineNumber = 0, | |
| lineHeight = 1.1, // ems | |
| y = text.attr("y"), | |
| dy = parseFloat(text.attr("dy")), | |
| tspan = text.text(null).append("tspan").attr("x", 0).attr("y", y).attr("dy", dy + "em") | |
| while (word = words.pop()) { | |
| line.push(word) | |
| tspan.text(line.join(" ")) | |
| if (tspan.node().getComputedTextLength() > width) { | |
| line.pop() | |
| tspan.text(line.join(" ")) | |
| line = [word] | |
| tspan = text.append("tspan").attr("x", 0).attr("y", y).attr("dy", `${++lineNumber * lineHeight + dy}em`).text(word) | |
| } | |
| } | |
| }) | |
| } | |
| </script> |
Is it possible to return a value from wrap() (and/or call()?) and pass it onwards? or update the data array? For instance, the number of lines the text has been broken to so it can be used to position other elements?
I solved my problem by chaining a call() method, that returns an array with the text nodes:
.call(wrap, x.rangeBand())
.call(function(d, i){
let textArray = d[0];
for (let i = 0; i < textArray.length; i++) {
if (textArray[i].hasChildNodes()) {
data[i].textNumLines = textArray[i].childNodes.length;
}
let textLabelY = parseInt(textArray[i].getAttribute('y'), 10);
data[i].textLabelY = textLabelY;
}
});
Hello!
I'd suggest to modify line 105 check with:
if (tspan.node().getComputedTextLength() > width && line.length > 1) {
Current code will create empty lead tspan if first word on the list has bigger width, than it can take.
Thanks! Hope it will help someone :)
wrap function seems to move label on right (only when there are multiple lines)
Any suggestions on how to fix this?
thanks!