d3.js条形图-无Y轴刻度

我有一个d3.js条形图，但是X轴列没有高度，可能是因为Y轴没有数据/刻度。最后一列应该显示出来。

“JSON：

[{"Domain":"Knowledge","Knowledge":0},{"Domain":"Problem Solving","problem_solving":0},{"Domain":"Skill","skill":0},{"Domain":"Transferable","transferable":100}]

图表：

var margin = {top: 50, right: 135, bottom: 70, left: 80},
    width = 1050 - margin.left - margin.right,
    height = 540 - margin.top - margin.bottom;  

  var svg = d3.select("#domains")
    .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 + ")");

// load the data
d3.json("json/domains.json", function(error, data) {

// Transpose the data into layers
var dataset = d3.layout.stack()(["Knowledge", "Problem Solving, Skill, Transferable"].map(function(lvl) {
  return data.map(function(d) {
    return {
      x: d.Domain,
      y: d[lvl]
    };
  });
}));

  var disciplines = d3.nest()
    .key(function(d){return d.Domain})
    .rollup(function(leaves){
      return d3.sum(leaves, function(d) {return d3.sum(d3.values(d))});
    })
    .entries(data);

  // Set x, y and colors
  var x = d3.scale.ordinal()
    .domain(dataset[0].map(function(d) { return d.x; }))
    .rangeRoundBands([10, width-10], 0.35, 0);

  var y = d3.scale.linear()
    .domain([0, d3.max(dataset, function(d) {  return d3.max(d, function(d) { return d.y0 + d.y; });  })])
    .range([height, 0]);

  var colors = ["#83d1c4", "#f17950", "#838BD1", "#F150BE"];

  // Define and draw axes
  var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
    .ticks(5)
    .tickSize(-width, 0, 0)
      .tickFormat(function(d) {
    return d;     
  });

  var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom")
    .outerTickSize(0)

  d3.select('.y axis .tick:first-child').remove();

  var tip = d3.tip()
  .attr('class', 'd3-tip')
  .offset([-0, 0])
  .html(function(d) {
    return d.y + '%';
  })

svg.call(tip);

  svg.append("g")
    .attr("class", "y axis")
    .attr("transform", "translate(0,0)")
    .call(yAxis);

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

    svg.append("text")
  .attr("x", 390 )
  .attr("y",  480 )
  .style("text-anchor", "middle")
  .text("Disciplines");

svg.append("text")
   .attr("x", -200 )
   .attr("y",  -40 )
   .attr("transform", "rotate(-90)" )
   .attr('style', 'font-size:12px')
   .style("text-anchor", "middle")
   .text("Percentage of Learning Events");

  // Create groups for each series, rects for each segment
  var groups = svg.selectAll("g.group")
    .data(dataset)
    .enter().append("g")
    .attr("class", "group")
    .style("fill", function(d, i) { return colors[i]; });

//  var svg = d3.select("svg");
  var bar = groups.selectAll("g")
    .data(function(d) { return d; })
    .enter().append("g")
    .attr("transform", function(d, i) {
      return "translate(" + x(d.x) + ", 0)";
    });

  var sum=0;
  bar.append("rect")
    .attr("y", function(d) { return y(d.y0 + d.y); })
    .attr("height", function(d) { return y(d.y0) - y(d.y0 + d.y); })
    .attr('class', 'segment')
    .attr("width", x.rangeBand())
    .on('mouseover', tip.show)
    .on('mouseout', tip.hide);

  columns = svg.append("g")
    .selectAll("text").data(disciplines)
    .enter().append("text")
    .attr("x", function(d){
      return x(d.key) + x.rangeBand()/2
    })
    .attr("y", function (d) {
      return y(d.values);
    })
    .attr("dy", "-0.7em")
    .attr('style', 'font-size:11px')
    .text( function (d){
      return d3.format(".2f")(d.values) + '%';
    })
    .style({fill: 'black', "text-anchor": "middle"});

  // Draw legend
var legend = svg.selectAll(".legend")
  .data(colors)
  .enter().append("g")
  .attr("class", "legend")
    .attr('style', 'font-size:12px')
  .attr("transform", function(d, i) {
    return "translate(30," + i * 19 + ")";
  });

  legend.append("rect")
    .attr("x", width - 18)
    .attr("width", 18)
    .attr("height", 18)
    .style("fill", function(d, i) {return colors.slice().reverse()[i];});

  legend.append("text")
    .attr("x", width + 5)
    .attr("y", 9)
    .attr("dy", ".35em")
    .style("text-anchor", "start")
    .text(function(d, i) {
      switch (i) {
      case 0:
        return "Knowledge";
      case 1:
        return "Problem Solving";
      case 2:
        return "Skill";
      case 3:
        return "Transferable";
      }
    });

    });

我有另一个d3.js图表，它使用了与上面几乎相同的图表代码和JSON格式，只是数据不同，列和Y轴刻度显示OK：

更新

将JSON中的“Domain”键更改为“Dom”，以免与d3.js函数.domain发生任何冲突（但对图表没有影响...）：
JSON格式：

[{"Dom":"Knowledge","Knowledge":0},{"Dom":"Problem Solving","problem_solving":0},{"Dom":"Skill","skill":0},{"Dom":"Transferable","transferable":100}]

图表：

var margin = {top: 50, right: 135, bottom: 70, left: 80},
    width = 1050 - margin.left - margin.right,
    height = 540 - margin.top - margin.bottom;  

  var svg = d3.select("#domains")
    .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 + ")");

// load the data
d3.json("json/domains.json", function(error, data) {

// Transpose the data into layers
var dataset = d3.layout.stack()(["Knowledge", "Problem Solving", "Skill", "Transferable"].map(function(lvl) {
  return data.map(function(d) {
    return {
      x: d.Dom,
      y: d[lvl]
    };
  });
}));

  var domains = d3.nest()
    .key(function(d){return d.Dom})
    .rollup(function(leaves){
      return d3.sum(leaves, function(d) {return d3.sum(d3.values(d))});
    })
    .entries(data);

  // Set x, y and colors
  var x = d3.scale.ordinal()
    .domain(dataset[0].map(function(d) { return d.x; }))
    .rangeRoundBands([10, width-10], 0.35, 0);

  var y = d3.scale.linear()
    .domain([0, d3.max(dataset, function(d) {  return d3.max(d, function(d) { return d.y0 + d.y; });  })])
    .range([height, 0]);

  var colors = ["#50E0C8", "#f17950", "#C283D1", "#50BCF1"];

  // Define and draw axes
  var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
    .ticks(5)
    .tickSize(-width, 0, 0)
      .tickFormat(function(d) {
    return d;     
  });

  var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom")
    .outerTickSize(0)

  d3.select('.y axis .tick:first-child').remove();

  var tip = d3.tip()
  .attr('class', 'd3-tip')
  .offset([-0, 0])
  .html(function(d) {
    return d.y + '%';
  })

svg.call(tip);

  svg.append("g")
    .attr("class", "y axis")
    .attr("transform", "translate(0,0)")
    .call(yAxis);

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

    svg.append("text")
  .attr("x", 390 )
  .attr("y",  480 )
  .style("text-anchor", "middle")
  .text("Domains");

svg.append("text")
   .attr("x", -200 )
   .attr("y",  -40 )
   .attr("transform", "rotate(-90)" )
   .style("text-anchor", "middle")
   .text("Percentage of Learning Events");

  // Create groups for each series, rects for each segment
  var groups = svg.selectAll("g.group")
    .data(dataset)
    .enter().append("g")
    .attr("class", "group")
    .style("fill", function(d, i) { return colors[i]; });

//  var svg = d3.select("svg");
  var bar = groups.selectAll("g")
    .data(function(d) { return d; })
    .enter().append("g")
    .attr("transform", function(d, i) {
      return "translate(" + x(d.x) + ", 0)";
    });

  var sum=0;
  bar.append("rect")
    .attr("y", function(d) { return y(d.y0 + d.y); })
    .attr("height", function(d) { return y(d.y0) - y(d.y0 + d.y); })
    .attr('class', 'segment')
    .attr("width", x.rangeBand())
    .on('mouseover', tip.show)
    .on('mouseout', tip.hide);

  columns = svg.append("g")
    .selectAll("text").data(domains)
    .enter().append("text")
    .attr("x", function(d){
      return x(d.key) + x.rangeBand()/2
    })
    .attr("y", function (d) {
      return y(d.values);
    })
    .attr("dy", "-0.7em")
    .attr('style', 'font-size:11px')
    .text( function (d){
      return d3.format(".2f")(d.values) + '%';
    })
    .style({fill: 'black', "text-anchor": "middle"});

    });

d3.js条形图-无Y轴刻度

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