mapsam/README.md

## README.md

      
    Raw
  

              README.md
            
          
    How to access secondary information within a topojson file and render it on the webpage.

  
## index.html
<!DOCTYPE html>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<style>
h1 {
  font-family:arial;
  font-size:2em;
  color:#333;
}
#info {
  position:absolute;
  top: 10px;
  left: 10px;
}
.states {
	fill: #e5e5e5;
	stroke: #fff;
	stroke-width:2px;
}
.states:hover {
	fill: steelblue;
}
</style>
<body>
<div id="info"><h1 id="name"></h1></div>
<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 svg = d3.select('body').append('svg')
	.attr('width', width)
	.attr('height', height);

var projection = d3.geo.albersUsa()
	.scale(1000)
	.translate([width / 2, height / 2]);

var path = d3.geo.path()
	.projection(projection);

d3.json('us.json', function(error, us) {
	svg.selectAll('.states')
		.data(topojson.feature(us, us.objects.usStates).features)
		.enter()
		.append('path')
		.attr('class', 'states')
		.attr('d', path)
		.on('mouseover', function(d){
			var name = d.properties.STATE_ABBR;
			return document.getElementById('name').innerHTML=name;
		});
});
</script>
</body>
</html>

## us.json

      
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Display the rendered blob

    
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              us.json
            
          
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	<!DOCTYPE html>
	<meta http-equiv="content-type" content="text/html; charset=utf-8">
	<style>
	h1 {
	font-family:arial;
	font-size:2em;
	color:#333;
	}
	#info {
	position:absolute;
	top: 10px;
	left: 10px;
	}
	.states {
	fill: #e5e5e5;
	stroke: #fff;
	stroke-width:2px;
	}
	.states:hover {
	fill: steelblue;
	}
	</style>
	<body>
	<div id="info"><h1 id="name"></h1></div>
	<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 svg = d3.select('body').append('svg')
	.attr('width', width)
	.attr('height', height);

	var projection = d3.geo.albersUsa()
	.scale(1000)
	.translate([width / 2, height / 2]);

	var path = d3.geo.path()
	.projection(projection);

	d3.json('us.json', function(error, us) {
	svg.selectAll('.states')
	.data(topojson.feature(us, us.objects.usStates).features)
	.enter()
	.append('path')
	.attr('class', 'states')
	.attr('d', path)
	.on('mouseover', function(d){
	var name = d.properties.STATE_ABBR;
	return document.getElementById('name').innerHTML=name;
	});
	});
	</script>
	</body>
	</html>