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HTML 

              
                <h1>Under 18 Population Living in Poverty, 2014</h1>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Open+Sans:300);
body{width:1000px;}
h1{font: small-caps 300 2em/1.5em 'Open Sans', sans-serif; text-align: center;margin: 20px auto 0;padding: 0;}
.land{ fill: #ccc; }
.border-states{
	stroke: #fff;
	fill: none;
	stroke-linejoin: round;
	stroke-linecap: round;
}
.states{fill: #aec7e8;}
.bubble{fill:red; fill-opacity: .5;}
.hover{stroke:#666; fill-opacity: .8;}
!

JS 

              
                //https://bost.ocks.org/mike/bubble-map/

var width = 1000,
	height = 600;

var path = d3.geo.path()
	.projection(null) //albersUsa projection stated in Make file when creating the topojson data

var radius = d3.scale.sqrt() 
	.domain([0, 3e6]) // INPUT domain-range of possible input data values
	//To avoid distortion, make sure that the minimum "domain" and "range" values are both 0
	.range([0, 60]); // OUTPUT range of possible output values

var arc = d3.svg.arc()
	.outerRadius(radius)	

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


var toolTip = d3.select('body')
	.append('div')
	.style('position', 'absolute')
	.style('padding', '0 10px')
	.style('background', '#fff')
	.style('opacity', 0)
  .style('font-family', 'Open Sans')
	.style('z-index', 1000);


d3.json('https://raw.githubusercontent.com/ameliapower/d3BubbleMap/master/builds/development/js/json/poverty/us.json', function(error, usa){
	if (error) return console.log(error);

	//build the main land area
	svg.append('path')
		.datum(topojson.feature(usa, usa.objects.nation))
		.attr('class', 'land')
		.attr('d', path); 


	svg.selectAll('.states')
    // retrieve the features so that id is accessed
    .data(topojson.feature(usa, usa.objects.counties).features)
    .enter().append('path')
    .attr('id', function(d) { return d.id; })
    .attr("class", "states states-hover")
    .attr('d', path)
     

         //add Tool Tip
    .on('mouseover', function(d, i){
			toolTip.transition()
			  .style('opacity', .9)
			  .style('left', (d3.event.pageX) + 'px')
			  .style('top', (d3.event.pageY) + 'px')  
			tempColor = this.style.fill; //store current color
			
			if(d.properties.name != null || d.properties.name != undefined){
				toolTip.html(d.properties.name + ", " + d.properties.population)	
			} else {
				toolTip.html("")	
			}
		})
		.on('mouseout', function(){
			d3.select(this)
			 .transition().delay(400).duration(800)
			 .style('opacity', 1)
			 .style('fill', tempColor)
		})



	//build internal state lines
	svg.append('path')
		.datum(topojson.mesh(usa, usa.objects.states, function(a, b) { 
			return a !== b; 
		})) //topojson.mesh
		.attr('class', 'border-states')
		.attr('d', path); 


	//show data as layered bubbles
	svg.append("g")
		.attr("class", "bubble")
		.selectAll("circle")
		.data(topojson.feature(usa, usa.objects.counties).features
			.sort(function(a, b) { //sort population low to high
				return b.properties.population - a.properties.population; 
			}) //sort
		) //data
		.enter().append("circle") 
   .on('mouseover', function(d, i){
			d3.select(this).attr('class', 'hover')
		})
		.on('mouseout', function(d, i){
			d3.select(this).attr('class', '')
		})
		.attr("transform", function(d) { 
			return "translate(" + path.centroid(d) + ")"; //Computes the projected centroid
		})
		.attr("r", function(d) { 
			return radius(d.properties.population); //radius var with input (domain) and output (range)
		})

}) //d3.json
!
999px

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