D3 Examples - WWSD #8: Data lookups

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<!DOCTYPE html>
<meta charset="utf-8">
<head>
  <title>San Francisco Precincts / Prop F</title>
<style>
​
body {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: 'Lato', sans-serif;
    color: #272a2f;
}
​
#mapcanvas {
  width: 960px;
  height: 600px;
  margin: 10px 10px 10px 10px;
​
}
.precinct path {
  fill: #555;
  stroke: #adadad;
}
  
.precinct-boundary {
  fill: none;
  stroke: #111;
  stroke-width: none;
}
​
</style>
​
</head>
​
<body>
<div id="mapcanvas" ></div> 
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.19/topojson.min.js"></script>
<script src="https://d3js.org/queue.v1.min.js"></script>
​
<script>
​
var width = 960,
    height = 600;
​
// MERCATOR
var projection = d3.geo.mercator()
    .center([-122.433701, 37.767683])
    .scale(211000)
    .translate([width / 2, height/2]);
​
var path = d3.geo.path()
    .projection(projection);
​
​
var svg = d3.select("#mapcanvas").append("svg")
    .attr("width", width)
    .attr("height", height);
​
// fancy way of combining AJAX requests
queue()
  .defer(d3.json, 'https://enjalot.github.io/wwsd/data/USA/sf-precincts.topojson')               
  .defer(d3.csv, 'https://enjalot.github.io/wwsd/data/USA/sf-precincts.csv') // REF
  .await(ready);
​
// this function gets called when all the data is loaded from the queue
function ready(error, sfjson, csv) {
  if (error) throw error; 
  
  // Ignore this topojson thing for now
  var precincts = topojson.feature(sfjson, sfjson.objects.precinct);  
  console.log("precincts", precincts)
  console.log("ref", csv)
​
  svg.append("g").attr("class", "precinct")
    .selectAll("path")
    .data(precincts.features)
    .enter()
      .append("path")
      .attr("d", path)
};
​
</script>
</html>
    