joannecheng/README.md

## README.md

      
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              README.md
            
          
    This example uses topojson.neighbors to compute neighboring congressional districts (from the 113th congress) from geographic boundaries by detecting shared edges (arcs). The red district is the hovered district, and the orange district is the neighboring districts.

  
## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>

.districts {
  fill: #bbb;
}

.district-boundaries {
  pointer-events: none;
  fill: none;
  stroke: #fff;
  stroke-width: .5px;
  stroke-linejoin: round;
}

.districts :hover {
  fill: red;
}

.neighbor {
  fill: orange;
}

</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://d3js.org/topojson.v1.min.js"></script>
<script>

var width = 960,
    height = 500;

var path = d3.geo.path();

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

d3.json("/d/8817038/us-congress-113-with-names.json", function(error, congress) {
  var districts = congress.objects['113-congress'],
      neighbors = topojson.neighbors(districts.geometries);

  var district = svg.append("g")
      .attr("class", "districts")
    .selectAll("path")
      .data(topojson.feature(congress, districts).features)
    .enter().append("path")
      .attr("d", path);

  district.append("title")
      .text(function(d) { return d.id; });

  district
      .each(function(d, i) { d.neighbors = d3.selectAll(neighbors[i].map(function(j) { return district[0][j]; })); })
      .on("mouseover", function(d) {
        d3.select('#district_label').text(d.properties.name + " state id: " + d.properties.stateid);

        d3.select('#district_label')
          .append('ul')
          .selectAll('li.neighbor')
          .data(d.neighbors[0]).enter()
          .append('li')
          .classed('neighbor', true)
          .text(function(d1) {
            return d1.__data__.properties.name + " state id: " + d1.__data__.properties.stateid;
          });
        d.neighbors.classed("neighbor", true);
      })
      .on("mouseout", function(d) { d.neighbors.classed("neighbor", false); });

  svg.append("path")
      .attr("class", "district-boundaries")
      .datum(topojson.mesh(congress, districts, function(a, b) { return a !== b; }))
      .attr("d", path);
});


</script>

<div id="district_label">
</div>
</body>
</html>

## us-congress-113-with-names.json

      
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              us-congress-113-with-names.json
            
          
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	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	.districts {
	fill: #bbb;
	}

	.district-boundaries {
	pointer-events: none;
	fill: none;
	stroke: #fff;
	stroke-width: .5px;
	stroke-linejoin: round;
	}

	.districts :hover {
	fill: red;
	}

	.neighbor {
	fill: orange;
	}

	</style>
	<body>
	<script src="http://d3js.org/d3.v3.min.js"></script>
	<script src="http://d3js.org/topojson.v1.min.js"></script>
	<script>

	var width = 960,
	height = 500;

	var path = d3.geo.path();

	var svg = d3.select("body").append("svg")
	.attr("width", width)
	.attr("height", height);

	d3.json("/d/8817038/us-congress-113-with-names.json", function(error, congress) {
	var districts = congress.objects['113-congress'],
	neighbors = topojson.neighbors(districts.geometries);

	var district = svg.append("g")
	.attr("class", "districts")
	.selectAll("path")
	.data(topojson.feature(congress, districts).features)
	.enter().append("path")
	.attr("d", path);

	district.append("title")
	.text(function(d) { return d.id; });

	district
	.each(function(d, i) { d.neighbors = d3.selectAll(neighbors[i].map(function(j) { return district[0][j]; })); })
	.on("mouseover", function(d) {
	d3.select('#district_label').text(d.properties.name + " state id: " + d.properties.stateid);

	d3.select('#district_label')
	.append('ul')
	.selectAll('li.neighbor')
	.data(d.neighbors[0]).enter()
	.append('li')
	.classed('neighbor', true)
	.text(function(d1) {
	return d1.__data__.properties.name + " state id: " + d1.__data__.properties.stateid;
	});
	d.neighbors.classed("neighbor", true);
	})
	.on("mouseout", function(d) { d.neighbors.classed("neighbor", false); });

	svg.append("path")
	.attr("class", "district-boundaries")
	.datum(topojson.mesh(congress, districts, function(a, b) { return a !== b; }))
	.attr("d", path);
	});


	</script>

	<div id="district_label">
	</div>
	</body>
	</html>