d3.js: how can I get 'full width' ticks on the y-axis

Question

I'm using this reusable column chart, with some modifications: https://gist.github.com/llad/3766585

/* Reusable column chart for d3.js          */
/*    https://gist.github.com/llad/3766585  */

function columnChart() {
  var margin = {top: 30, right: 10, bottom: 50, left: 50},
      width = 420,
      height = 420,
      xRoundBands = 0.2,
      xValue = function(d) { return d[0]; },
      yValue = function(d) { return d[1]; },
      xScale = d3.scale.ordinal(),
      yScale = d3.scale.linear(),
      xFormat = '',
      yFormat = '',
      yAxis = d3.svg.axis().scale(yScale).orient("left"),
      xAxis = d3.svg.axis().scale(xScale);


  function chart(selection) {
    selection.each(function(data) {

      // Convert data to standard representation greedily;
      // this is needed for nondeterministic accessors.
      data = data.map(function(d, i) {
        return [xValue.call(data, d, i), yValue.call(data, d, i)];
      });

      // Update the x-scale.
      xScale
          .domain(data.map(function(d) { return d[0];} ))
          .rangeRoundBands([0, width - margin.left - margin.right], xRoundBands);


      // Update the y-scale.
      yScale
          .domain(d3.extent(data.map(function(d) { return d[1];} )))
          .range([height - margin.top - margin.bottom, 0])
          .nice();


      // Select the svg element, if it exists.
      var svg = d3.select(this).selectAll("svg").data([data]);

      // Otherwise, create the skeletal chart.
      var gEnter = svg.enter().append("svg").append("g");
      gEnter.append("g").attr("class", "bars");
      gEnter.append("g").attr("class", "y axis");
      gEnter.append("g").attr("class", "x axis");
      gEnter.append("g").attr("class", "x axis zero");

      // Update the outer dimensions.
      svg .attr("width", width)
          .attr("height", height);

      // Update the inner dimensions.
      var g = svg.select("g")
          .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

     // Update the bars.
      var bar = svg.select(".bars").selectAll(".bar").data(data);
      bar.enter().append("rect");
      bar.exit().remove();
      bar.attr("class", function(d, i) { return d[1] < 0 ? "bar negative" : "bar positive"; })
        .attr("x", function(d) { return X(d); })
        .attr("y", function(d, i) { return d[1] < 0 ? Y0() : Y(d); })
        .attr("width", xScale.rangeBand())
        .attr("height", function(d, i) { return Math.abs( Y(d) - Y0() ); })
        .on("click", function(d, i) 
        {
            d3.selectAll('.bar').classed('fade', true);
            d3.select(this).classed("sel", true).classed("fade", false);
        })
        .on("mouseover", function(d, i) 
        {
            d3.select(this).classed("hover", true);
        })
        .on("mouseout", function(d, i) 
        {
            d3.select(this).classed("hover", false);
        });

    // x axis at the bottom of the chart
     g.select(".x.axis")
        .attr("transform", "translate(0," + (height - margin.top - margin.bottom) + ")")
        .call(xAxis.orient("bottom").tickFormat(xFormat));

    // zero line
     g.select(".x.axis.zero")
        .attr("transform", "translate(0," + Y0() + ")")
        .call(xAxis.tickFormat("").tickSize(0));


      // Update the y-axis.
      g.select(".y.axis")
        .call(yAxis);

    });
  }


// The x-accessor for the path generator; xScale ∘ xValue.
  function X(d) {
    return xScale(d[0]);
  }

  function Y0() {
    return yScale(0);
  }

  // The x-accessor for the path generator; yScale ∘ yValue.
  function Y(d) {
    return yScale(d[1]);
  }

  chart.margin = function(_) {
    if (!arguments.length) return margin;
    margin = _;
    return chart;
  };

  chart.width = function(_) {
    if (!arguments.length) return width;
    width = _;
    return chart;
  };

  chart.height = function(_) {
    if (!arguments.length) return height;
    height = _;
    return chart;
  };

  chart.x = function(_) {
    if (!arguments.length) return xValue;
    xValue = _;
    return chart;
  };

  chart.y = function(_) {
    if (!arguments.length) return yValue;
    yValue = _;
    return chart;
  };

  chart.yTickFormat = function(_) {
    if (!arguments.length) return yFormat;
    yFormat = _;
    return chart;
  };

  chart.xTickFormat = function(_) {
    if (!arguments.length) return xFormat;
    xFormat = _;
    return chart;
  };

  return chart;
}

It's a nice little script! I've added the xTickFormat and click and mouseover functions.

However, on column charts I like to have faint horizontal lines going the full width of the chart, essentially extending the y-axis ticks to the full width.

1. How do modify the yAxis to get these full width lines, or an option to have those lines?

Thanks!

Answer 1

Have a look: http://jsfiddle.net/samselikoff/Jqmzd/2/

The key is the .tickSize() property.