d3 条形图中的自定义 x 轴标签？

Question

我是 d3 的新手，我正在尝试根据一些操作来组织我的数据。我查看了此处的其他帖子并遵循了类似的答案（参见 here and here），但出于某种原因，x 轴未显示我在 var workflow_actions = ["SB","SE","DR","RD","EN","RE"]; 中创建的顺序，而是以不同的顺序显示。

也许最好的方法是改用序数尺度？参见 D3 API

我认为问题出在这一行：x.domain(data.map(function(d) { return d.phase; }));

这是根据 Stack Overflow 提出的建议：

var workflow_actions = ["SB","SE","DR","RD","EN","RE"];
var formatAction = function(d) {
    return workflow_actions[d % 6];
}

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom")
    .tickValues(workflow_actions);

这是我的代码：

var margin = {top: 40, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var x = d3.scale.ordinal()
    .domain([SB","SE","DR","RD","EN","RE"]) # just added based on API
    .rangeRoundBands([0, width], .1);

var y = d3.scale.linear()
    .range([height, 0]);

var workflow_actions = ["SB","SE","DR","RD","EN","RE"];
var formatAction = function(d) {
    return workflow_actions[d % 6];
}

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom")
    .tickValues(workflow_actions);

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");

var tipLabelMap = {
  #labels
};

var tip = d3.tip()
  .attr('class', 'd3-tip')
  .offset([-10, 0])
  .html(function(d) {
    return "<strong>" + getTipLabel(d.phase) + ":</strong> <span style='color:red'>" + d.count + "</span>";
  })

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 + ")");

svg.call(tip);

d3.json("mydata", function(error, data) {

  x.domain(data.map(function(d) { return d.phase; })); ## ISSUE!!!!
  y.domain([0, d3.max(data, function(d) { return d.count; })]);

  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);

  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Count");

  svg.selectAll(".bar")
      .data(data)
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return x(d.phase); })
      .attr("width", x.rangeBand())
      .attr("y", function(d) { return y(d.count); })
      .attr("height", function(d) { return height - y(d.count); })
      .on('mouseover', tip.show)
      .on('mouseout', tip.hide)
});

function getTipLabel(phase) {
    return tipLabelMap[phase];
}
</script>

Answer 1

由于您的 workflow_actions 具有一些与比例域不同的值，因此您不想在此处使用 tickValues，而是 tickFormat：

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom")
    .tickFormat((d,i) => workflow_actions[i]);

这是一个演示，带有比例域和 workflow_actions 数组：

var svg = d3.select("svg");

var x = d3.scale.ordinal()
    .domain(["SU","SI","SE","CD","EN","RE"])
    .rangeRoundBands([20, 280], .1);

var workflow_actions = ["SB","SE","DR","RD","EN","RE"];

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom")
    .tickFormat((d,i)=>workflow_actions[i]);
  
svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0,130)")
      .call(xAxis);

.axis path, .axis line {
    fill: none;
    stroke: black;
    shape-rendering: crispEdges;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<svg></svg>

编辑：以上答案解决了原始问题，其中 workflow_actions 与域不同。要了解 OP 的实际问题，请阅读下面的评论。

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