simple grid

<!DOCTYPE html>
<meta charset="utf-8">
<style>
  body {
    font-family: Helvetica;
    font-size: 10px;
  }

.point {
    fill: black;
  }

rect {
    fill: none;
    stroke: black;
    stroke-width: 1;
  }
</style>
<body>
<script src="https://d3js.org/d3.v4.js"></script>
<script src="https://romsson.github.io/d3-gridding/build/d3-gridding.js"></script>
<script>

var width = 400,
    height = 300;

var gridding = d3.gridding()
  .size([width, height])
  .mode("grid");

var data =  d3.range(250).map(function(d, i) {
  return {v: d};
});

var griddingData = gridding(data);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

svg.selectAll(".square")
    .data(griddingData)
  .enter().append("rect")
    .attr("class", "square")
    .attr("width", function(d) { return d.width; })
    .attr("height", function(d) { return d.height; })
    .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; })

svg.selectAll(".index")
    .data(griddingData)
  .enter().append("text")
    .attr("class", "index")
    .style('text-anchor', 'middle')
    .style('dominant-baseline', 'central')
    .attr("transform", function(d) { return "translate(" + d.cx + "," + d.cy + ")"; })
    .text(function(d, i) { return d.v; });
    
  </script>
</body>

Modified http://d3js.org/d3.v4.js to a secure url

Modified http://romsson.github.io/d3-gridding/build/d3-gridding.js to a secure url

https://d3js.org/d3.v4.js

https://romsson.github.io/d3-gridding/build/d3-gridding.js