Adding label on a D3 bar chart

Question

I read a lot of documentation about adding label on a D3 bar chart but i can't figure it out. I am stuck with what to add after the "svg.selectAll("text")".

The result would just be the same as in this example :

Here is the code :

var margin = {top: 20, right: 30, bottom: 50, left: 100},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;


var x = d3.scale.ordinal()
    .rangeRoundBands([0, width], .1, 1);

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

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

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
    .tickFormat(function (d) {
      if ((d / 1000000) >= 1) {
        d = d / 1000000  + " " + "000" + " " + "000";
      }
      return d;
    });
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.csv("./test.csv", function(error, data) {

  data.forEach(function(d) {
    d.internaute = +d.internaute;
  });

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

  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis)
     .append("text")
        .attr("x", width / 2)
        .attr("y", 30)
      .attr("dx", ".71em")
      .style("text-anchor", "end")
      .text("Date");


  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("Internautes");


  svg.selectAll(".bar")
      .data(data)
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return x(d.date); })
      .attr("width", x.rangeBand())
      .attr("y", function(d) { return y(d.internaute); })
      .attr("height", function(d) { return height - y(d.internaute);});

    svg.selectAll("text")
     //???? //

});

Thank you in advance. I hope to get the hold of it :)

Answer 1

This should work !

var yTextPadding = 20;
svg.selectAll(".bartext")
.data(data)
.enter()
.append("text")
.attr("class", "bartext")
.attr("text-anchor", "middle")
.attr("fill", "white")
.attr("x", function(d,i) {
    return x(i)+x.rangeBand()/2;
})
.attr("y", function(d,i) {
    return height-y(d)+yTextPadding;
})
.text(function(d){
     return d;
});

Notice how I use a class (.bartext) to identify the chart labels.