Zoomable Area SVG

forked from mbostock's block: Zoomable Area

Changes from this version are noted in code comments.

<!DOCTYPE html>
<style>
  /* to prevent browser overscrolling bounce */
  html {
    overflow: hidden;
  }
</style>
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>

var svg = d3.select("svg"),
    margin = {top: 20, right: 20, bottom: 30, left: 60},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom,
    g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")");

// changed data format
var parseDate = d3.timeParse("%Y/%m/%d %H:%M"),
    formatDate = d3.timeFormat("%Y");

var x = d3.scaleTime()
//  .domain([new Date(1999, 0, 1), new Date(2003, 0, 0)])
    .range([0, width]);

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

var xAxis = d3.axisBottom(x);

var yAxis = d3.axisLeft(y);

var area = d3.area()
    .curve(d3.curveStepAfter)
    .y0(y(0))
    .y1(function(d) { return y(d.value); });

var areaPath = g.append("path")
    .attr("clip-path", "url(#clip)")
    .attr("fill", "steelblue");

var yGroup = g.append("g");

var xGroup = g.append("g")
    .attr("transform", "translate(0," + height + ")");

// changed scales and extents
var zoom = d3.zoom()
    .scaleExtent([1, Infinity])
    .translateExtent([[0, 0], [width, height]])
    .extent([[0, 0], [width, height]])
    .on("zoom", zoomed);

var zoomRect = svg.append("rect")
    .attr("width", width)
    .attr("height", height)
//  realigned zoomRect to match rest of chart
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
//  gave it a recognizable name
		.attr("class", "zoom-area")
    .attr("fill", "none")
    .attr("pointer-events", "all")
    .call(zoom);

g.append("clipPath")
    .attr("id", "clip")
  .append("rect")
    .attr("width", width)
    .attr("height", height);

// changed data source
d3.csv("TBLkW.csv", type, function(error, data) {
  if (error) throw error;
  var xExtent = d3.extent(data, function(d) { return d.date; });
//zoom.translateExtent([[x(xExtent[0]), -Infinity], [x(xExtent[1]), Infinity]])
// replaces line 23
  x.domain(xExtent);
  y.domain([0, d3.max(data, function(d) { return d.value; })]);
  yGroup.call(yAxis);
  //.select(".domain").remove();
  areaPath.datum(data);
  zoomRect.call(zoom.transform, d3.zoomIdentity);
});

</script>

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