score:1

Accepted answer

You can use your existing y scale to calculate the position of the total in the same way that you've done with the top and bottom edges of the rectangles and the text on each. Rather than using d.y0 or d.y1, you need to use d.total:

categories.append("text")
  .attr("text-anchor", "middle")
  .attr("x", x.bandwidth()/2)
  .attr("y", function(d) { return y(d.total); }) // d.total!
  .style("fill", "black")
  .text(function(d) { return d.total; });

This will position the text right on top of the top rectangle, so it's a good idea to add a bit of an offset to this:

categories.append("text")
  .attr("text-anchor", "middle")
  .attr("x", x.bandwidth()/2)
  .attr("y", function(d) { return y(d.total); })
  .attr('dy', '-0.5em') // add 0.5em offset
  .style("fill", "black")
  .text(function(d) { return d.total; });

Here is a working example:

var Data = [
    {
        "Categories": "Lissabon",
        "1": "34",
        "2": "76",
        "3": "87",
        "4": "54",
        "5": "66",
        "6": "72"
    },
    { Categories: "This",
      1: 239, 2: 254, 3: 225, 4: 152, 5: 362, 6: 98
    },
    { Categories: "That",
      1: 457, 2: 234, 3: 83, 4: 327, 5: 88, 6: 99
    },
    { Categories: "The Other",
      1: 132, 2: 286, 3: 222, 4: 150, 5: 363, 6: 95
    }
    ]
var height = 600,
width = 600,
margin = { left: 10, right: 10, top: 20, bottom: 20 }

var x = d3.scaleBand()
    .rangeRound([0, width])
    .paddingInner(0.2);

var y = d3.scaleLinear()
    .rangeRound([height, 0]);

var color = d3.scaleOrdinal()
    .range(d3.schemeGreys[7]);

var xAxis = d3.axisBottom(x);

var yAxis = d3.axisLeft(y)
    .tickFormat(d3.format(".2s"));

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 + ")");

var update = function(data) {

  color.domain(d3.keys(data[0]).filter(function(key) { return key !== "Categories"; }));

  data.forEach(function(d) {
    var y0 = 0;
    d.stores = color.domain().map(function(name) { return {name: name, y0: y0, y1: y0 += +d[name]}; });
    d.total = d.stores[d.stores.length - 1].y1;
  });

  data.sort(function(a, b) { return b.total - a.total; });

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

  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call((xAxis)
        .tickSize(0)
        .tickPadding(6));

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

    categories.selectAll("rect")
      .data(function(d) { return d.stores; })
    .enter().append("rect")
      .attr("width", x.bandwidth())
      .attr("y", function(d) { return y(d.y1); })
      .attr("height", function(d) { return y(d.y0) - y(d.y1); })
      .style("fill", function(d) { return color(d.name); });

    categories.selectAll("text")
      .data(function(d) { return d.stores; })
    .enter().append("text")
      .attr("y", function(d) { return y((d.y0 + d.y1) / 2); })
      .attr("x", x.bandwidth()/2)
      .attr('dy', '0.35em')
      .attr("text-anchor","middle")
      .attr("alighnment-baseline", "middle")
      .style("fill",'#fff')
      .text(function(d) { return d.y1 - d.y0; });

    categories.append("text")
      .attr("text-anchor", "middle")
      .attr("x", x.bandwidth()/2)
      .attr("y", function(d) { return y(d.total); })
      .attr('dy', '-0.5em')
      .style("fill", "black")
      .text(function(d) { return d.total; });
}

update(Data)
<script type="text/javascript" src="http://d3js.org/d3.v5.js"></script>


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