D3 Examples - D3 + Leaflet v4

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<!DOCTYPE html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<script src="https://d3js.org/d3.v4.min.js"></script>
<title>2016 Presedential Votes</title>
<style>
​
@import url(//cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.2/leaflet.css);
      body {
        margin: 0px;
      }
      .domain {
        display: none;
      }
      .tick line {
        stroke: #C0C0BB;
      }
      .tick text {
        fill: #8E8883;
        font-size: 10pt;
        font-family: sans-serif;
      }
      .axis-label {
        fill: #635F5D;
        font-size: 16pt;
        font-family: sans-serif;
      }
            .topcorner{
         position:absolute;
         top:0;
             right:0;
         height: 250px;
         width: 480px;
       z-index: 100;
       background:white;
        }
#map {
  width: 960px;
  height: 500px;
}
​
path {
  fill: #000;
  fill-opacity: .2;
  stroke: #fff;
  stroke-width: 1.5px;
}
​
path:hover {
  fill: brown;
  fill-opacity: .7;
}
​
</style>
<script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.19/topojson.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.2/leaflet.js"></script>
<body>
<div class="topcorner">
    <svg width="480" height="250"></svg>
</div>
<div id="map"</div>
<script>
  
//**************************chart*****************************************
var barChart = function(countyFP){
      const xValue = d => d.value;
      const xLabel = 'Votes';
      const yValue = d => d.name;
      const yLabel = 'Candidate';
      const margin = { left: 150, right: 30, top: 5, bottom: 75 };
​
      
        const svg = d3.select('svg');
        const svgRemove = svg.selectAll('*').remove();
      const width = svg.attr('width');
      const height = svg.attr('height');
      const innerWidth = width - margin.left - margin.right;
      const innerHeight = height - margin.top - margin.bottom;
​
      const g = svg.append('g')
          .attr('transform', `translate(${margin.left},${margin.top})`);
      const xAxisG = g.append('g')
          .attr('transform', `translate(0, ${innerHeight})`);
      const yAxisG = g.append('g');
​
      xAxisG.append('text')
          .attr('class', 'axis-label')
          .attr('x', innerWidth / 2)
          .attr('y', 55)
          .text(xLabel);
​
      const xScale = d3.scaleLinear();
      const yScale = d3.scaleBand()
        .paddingInner(0.3)
        .paddingOuter(0);
​
      const xTicks = 5;
      const xAxis = d3.axisBottom()
        .scale(xScale)
        .ticks(xTicks)
        .tickPadding(5)
        .tickFormat(d3.format('.0s'))
        .tickSize(-innerHeight);
​
      const yAxis = d3.axisLeft()
        .scale(yScale)
        .tickPadding(5)
        .tickSize(-innerWidth);
​
      const row = d => {
        return {
          county: d.countyfp10,
          attributes:[
          {
            name: 'Clinton', 
            value: Number(d.pres_clinton)
          },
          {
            name: 'Trump', 
            value: Number(d.pres_trump)
        },
          {
            name: 'Johnson', 
            value: Number(d.pres_johnson)
        },
          {
            name: 'Stein', 
            value: Number(d.pres_stein)
        },
          {
            name: 'Lariva', 
            value: Number(d.pres_lariva)
        },
          {
            name: 'Other', 
            value: Number(d.pres_other)
        }
      ]
        };
      };
​
      const top5 = data => data.slice(0, 5);      
      
      //function filterCriteria(d) {
        //  return d.county === '037';
            //};
        function filterCriteria(d) {
            return d.county === countyFP;
            };
        
        d3.csv('california-2016-county-results.csv', row, data => {        
        //data = top5(data);
        data = data.filter(filterCriteria);
        data = data[0]['attributes'];
        //console.log(data);
        //console.log(Object.keys(data)[0]);
        
        yScale
          .domain(data.map(yValue).reverse())
          .range([innerHeight, 0]);
​
        xScale
          .domain([0, d3.max(data, xValue)])
          .range([0, innerWidth])
          .nice(xTicks);
​
        g.selectAll('rect').data(data)
          .enter().append('rect')
            .attr('x', 0)
                .attr('y', d => yScale(yValue(d)))
            .attr('width', d => xScale(xValue(d)))
            .attr('height', d => yScale.bandwidth())
            .attr('fill', 'steelblue');
      
​
        xAxisG.call(xAxis);
​
        yAxisG.call(yAxis);
        yAxisG.selectAll('.tick line').remove();
      });
   };
  barChart('037');
//**************************chart*****************************************
//**************************map*******************************************
var osmUrl = 'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
    osmAttrib = '&copy; <a href="https://openstreetmap.org/copyright">OpenStreetMap</a> contributors',
    osm = L.tileLayer(osmUrl, {maxZoom: 18, attribution: osmAttrib});
​
var map = L.map('map').setView([37.5, -115], 6).addLayer(osm);
​
var svgMap = d3.select(map.getPanes().overlayPane).append("svg"),
    gMap = svgMap.append("g").attr("class", "leaflet-zoom-hide");
​
var transform = d3.geoTransform({point: projectPoint}),
    path = d3.geoPath().projection(transform);
​
d3.json("counties.json", function(error, ca) {
  var features = ca.objects.CA.geometries.map(function(d) { return topojson.feature(ca, d); });
  var all = topojson.merge(ca, ca.objects.CA.geometries);
​
  var states = gMap.selectAll("path")
      .data(features)
        .enter()
      .append("path")
        .on("mouseover", function(d){
            //d3.select(this).transition(0).duration(0);
            //console.log(d.properties.COUNTYFP)
        barChart(d.properties.COUNTYFP);
            });
​
  map.on("viewreset", reset);
  reset();
​
  // Reposition the SVG to cover the features.
  function reset() {
    var bounds = path.bounds(all),
        topLeft = bounds[0],
        bottomRight = bounds[1];
​
    svgMap .attr("width", bottomRight[0] - topLeft[0])
        .attr("height", bottomRight[1] - topLeft[1])
        .style("left", topLeft[0] + "px")
        .style("top", topLeft[1] + "px");
​
    gMap.attr("transform", "translate(" + -topLeft[0] + "," + -topLeft[1] + ")");
​
    states.attr("d", path);
  }
});
​
// Use Leaflet to implement a D3 geometric transformation.
function projectPoint(x, y) {
  // Returns the map layer point that corresponds to the given geographical coordinates
  var point = map.latLngToLayerPoint(new L.LatLng(y, x));
  this.stream.point(point.x, point.y);
}
//**************************map*******************************************
</script>
​
    