如何使用d3.js对图表标签进行wordwrap

Question

我正在尝试使用d3.js实现水平条形图.某些图表标签太长.如何对y aixs上的图表标签进行自动换行？

源代码:

var data = [{"Name": "Label 1", "Count": "428275" }, { "Name": "Label 2", "Count": "365005" }, { "Name": "Label 3", "Count": "327619" }];

var m = [30, 10, 10, 310],
w = 1000 - m[1] - m[3],
h = 550 - m[0] - m[2];

var format = d3.format(",.0f");

var x = d3.scale.linear().range([0, w + 10]),
    y = d3.scale.ordinal().rangeRoundBands([0, h], .4);

var xAxis = d3.svg.axis().scale(x).orient("bottom").tickSize(h),
    yAxis = d3.svg.axis().scale(y).orient("left").tickSize(0);

$("#chartrendering").empty();
var svg = d3.select("#chartrendering").append("svg")
    .attr("width", w + m[1] + m[3])
    .attr("height", h + m[0] + m[2])
  .append("g")
    .attr("transform", "translate(" + m[3] + "," + m[0] + ")");

// Set the scale domain.

x.domain([0, d3.max(data, function (d) { return d.Count; })]);
y.domain(data.map(function (d) { return d.Name; }));

var bar = svg.selectAll("g.bar")
    .data(data)
  .enter().append("g")
    .attr("class", "bar")
    .attr("transform", function (d) { return "translate(0," + y(d.Name) + ")"; });

bar.append("rect")
    .attr("width", function (d) { return x(d.Count); })
    .attr("height", y.rangeBand());

bar.append("text")
    .attr("class", "value")
    .attr("x", function (d) { return x(d.Count); })
    .attr("y", y.rangeBand() / 2)
    .attr("dx", +55)
    .attr("dy", ".35em")
    .attr("text-anchor", "end")
    .text(function (d) { return format(d.Count); });

svg.append("g")
    .attr("class", "x axis")
    .call(xAxis);

svg.append("g")
    .attr("class", "y axis")
    .call(yAxis);

Answer 1

Here is a working implementation I've written by pulling together various bits. As the other answer suggests, foreignObject is still the way to go. First the function:

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();

};

This takes in a text element (t), the text content (d), and the width to wrap to. It then gets the parentNode of the text object, and attaches a foreignObject node to it into which an xhtml:p is added. The foreignObject is set to the desired width and offset -width/2 to center. Finally, the original text element is deleted.

This can then be applied to your axis elements as follows:

d3.select('#xaxis')
    .selectAll('text')
        .each(function(d,i){ insertLinebreaks(this, d, x1.rangeBand()*2 ); });

Here I've used rangeBand to get the width (with*2 for 2 bars on the graph).

Answer 2

我一直在寻找这个问题的解决方案,并发现Mike Bostock已经发布了一个使用D3 的工作示例.示例显示适用于x轴,但可以很容易地适应y轴.

Answer 3

您无法在 SVG 中进行自动换行。您可以使用foreignObject和 HTMLdiv来实现此目的，但这需要修改创建轴标签的代码。或者，您可以旋转轴标签，以便它们有更多空间。例如，请参阅此处了解如何执行此操作。