JSFiddle - React, Tailwind, and code Playground

by nrabinowitz

HTML

<script src="http://d3js.org/d3.v3.js"></script>

CSS

body {
  font: 10px sans-serif;
}

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

.x.axis path {
  display: none;
}

.line {
  fill: none;
  stroke: steelblue;
  stroke-width: 1.5px;
}

JavaScript

var margin = {top: 20, right: 80, bottom: 30, left: 50},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

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

var x = d3.time.scale()
    .range([0, width]);

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

var color = d3.scale.category10();

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

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");

var line = d3.svg.line()
    .x(function(d) { return x(d.date); })
    .y(function(d) { return y(d.temperature); });

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 + ")");

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

  data.forEach(function(d) {
    d.date = parseDate(d.date);
  });
    
  // get the min/max dates
  var extent = d3.extent(data, function(d) { return d.date; }),
      // hash the existing days for easy lookup
      dateHash = data.reduce(function(agg, d) {
          agg[d.date] = true;
          return agg;
      }, {}),
      headers = color.domain();
    // make even intervals
    d3.time.days(extent[0], extent[1])
        // drop the existing ones
        .filter(function(date) {
            return !dateHash[date];
        })
        // and push them into the array
        .forEach(function(date) {
            var emptyRow = { date: date };
            headers.forEach(function(header) {
                emptyRow[header] = null;
            });
            data.push(emptyRow);
        });
    // re-sort the data
    data.sort(function(a, b) { return d3.ascending(a.date, b.date); });

  var cities = color.domain().map(function(name) {
    return {
      name: name,
      values: data.map(function(d) {
        return {date: d.date,...