heat-map

<!DOCTYPE html>
<meta charset="utf-8">
<head>
<style>

body {
  font: 10px sans-serif;
}

.label {
  font-weight: bold;
}

.tile {
  shape-rendering: crispEdges;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;

}

.grid .tick {
    stroke: lightgrey;
    opacity: 0.2;
}
.grid path {
      stroke-width: 0;
}

</style>
</head>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>

var margin = {top: 20, right: 90, bottom: 30, left: 120},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var parseDate = d3.time.format("%Y-%m-%d").parse,
    formatDate = d3.time.format("%b %d");

var x = d3.scale.ordinal().rangeBands([0, width]);
    y = d3.scale.ordinal().rangeBands([height, 0]),
    z = d3.scale.linear().range(["white", "steelblue"]);

// The size of the buckets in the CSV data file.
// This could be inferred from the data if it weren't sparse.
var xStep;
var yStep ;

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("data4.csv", function(buckets) {
	//*******************
	//Assuming that the bin ranges are continous values
	// We are assinging step size from the data
	//xStep=buckets[0].x2-buckets[0].x1;
	//yStep=buckets[0].y2-buckets[0].y1;
	
	
  // Coerce the CSV data to the appropriate types.
  buckets.forEach(function(d) {
	
    d.date = +d.x1;
    d.bucket = +d.y1;
    d.count = +d.count;
  });

//***************************
	//Finding the Extents of Values on the X axis and the Y axis 
	// Data to be passed in axis scales to determine tick interval and labels
	//var extentX=d3.extent(buckets, function(d) { return d.date; });
	//var extentY=d3.extent(buckets, function(d) { return d.bucket;});

// Compute the scale domains.
 // x.domain(d3.extent(buckets, function(d) { return d.date; }));
 x.domain(buckets.map(function(d) { return d.x1; })); 
 y.domain(buckets.map(function(d) { return d.y1; }));
 //y.domain(d3.extent(buckets, function(d) { return d.bucket; }));
  z.domain([0, d3.max(buckets, function(d) { return d.count; })]);

//console.log(x.domain()[1]);
  // Extend the x- and y-domain to fit the last bucket.
  // For example, the y-bucket 3200 corresponds to values [3200, 3300].
  // x.domain([x.domain()[0], x.domain()[1] + xStep]);
   //y.domain([y.domain()[0], y.domain()[1] + yStep]);

// Display the tiles for each non-zero bucket.
  // See https://bl.ocks.org/3074470 for an alternative implementation.
  svg.selectAll(".tile")
      .data(buckets)
    .enter().append("rect")
      .attr("class", "tile")
      .attr("x", function(d) { 
		console.log(d.x1+"haha"+x(d.x1));
		console.log(x.rangeBand(x.x1));	
	  return x(d.x1); })
      .attr("y", function(d) { 
		  return y(d.y1); })
      .attr("width", x.rangeBand(x.x1))
      .attr("height",  y.rangeBand(y.y1))
      .style("fill", function(d) { return z(d.count); })
      .append("title")
      .text(function(d){return d.count});

// Add a legend for the color values.
  var legend = svg.selectAll(".legend")
      .data(z.ticks(6).slice(1).reverse())
    .enter().append("g")
      .attr("class", "legend")
      .attr("transform", function(d, i) { return "translate(" + (width + 20) + "," + (20 + i * 20) + ")"; });

legend.append("rect")
      .attr("width", 20)
      .attr("height", 20)
      .style("fill", z);

legend.append("text")
      .attr("x", 26)
      .attr("y", 10)
      .attr("dy", ".35em")
      .text(String);

svg.append("text")
      .attr("class", "label")
      .attr("x", width + 20)
      .attr("y", 10)
      .attr("dy", ".35em")
      .text("Count");

//Appending the grid lines
  function make_x_axis() {        
    return d3.svg.axis()
        .scale(x)
        .tickValues(d3.range(893, 1793, 100))
         .orient("bottom")
         
}

function make_y_axis() {        
    return d3.svg.axis()
        .scale(y)
        .orient("left")
        
        
}

/*
// Extend the ticks to make a grid
svg.append("g")         
        .attr("class", "grid")
        .attr("transform", "translate(0," + height + ")")
        .call(make_x_axis()
            .tickSize(-height, 0, 0)
            .tickValues(d3.range(extentX[0], extentX[1]+(2*xStep), xStep))
            .ticks(20)
            .tickFormat("")
        )

svg.append("g")         
        .attr("class", "grid")
        .call(make_y_axis()
            .tickSize(-width, 0, 0)
            .tickValues(d3.range(extentY[0], extentY[1]+(2*yStep), yStep))
            .tickFormat("")
        )
  */
  // Add an x-axis with label.
  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.svg.axis().scale(x).orient("bottom"))//2x because taking extent from x1 column
    .append("text")
      .attr("class", "label")
      .attr("x", width)
      .attr("y", -6)
      .attr("text-anchor", "end")
      .text("Value");

// Add a y-axis with label.
  svg.append("g")
      .attr("class", "y axis")
      .call(d3.svg.axis().scale(y).orient("left"))
     
	  .append("text")
      .attr("class", "label")
      .attr("y", 6)
      .attr("dy", ".71em")
      .attr("text-anchor", "end")
      .attr("transform", "rotate(-90)")
      .text("Value");
});

</script>
</body>
</html>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js