US seat belt law changes

My first D3 map showing my travel across the US. This visualization was built by modifying choropleth example code by Scott Murray, tooltip example code by Malcolm Maclean, and legend code example by Mike Bostock.

forked from michellechandra's block: Basic US State Map - D3

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<script src="https://d3js.org/d3.v3.min.js"></script>
<style type="text/css">

/* On mouse hover, lighten state color */
path:hover {
	fill-opacity: .7;
}

/* Style for Custom Tooltip */
div.tooltip {   
 	position: absolute;           
	text-align: center;           
	width: 60px;                  
	height: 28px;                 
	padding: 2px;             
	font: 12px sans-serif;        
	background: white;   
	border: 0px;      
	border-radius: 8px;           
	pointer-events: none;         
}
        
/* Legend Font Style */
body {
	font: 11px sans-serif;
}
        
/* Legend Position Style */
.legend {
	position:absolute;
	left:800px;
	top:350px;
}

</style>
</head>
<body>
<script type="text/javascript">

/*  This visualization was made possible by modifying code provided by:

Scott Murray, Choropleth example from "Interactive Data Visualization for the Web" 
https://github.com/alignedleft/d3-book/blob/master/chapter_12/05_choropleth.html   
		
Malcolm Maclean, tooltips example tutorial
https://www.d3noob.org/2013/01/adding-tooltips-to-d3js-graph.html

Mike Bostock, Pie Chart Legend
https://bl.ocks.org/mbostock/3888852  */

//Width and height of map
var width = 960;
var height = 500;

// D3 Projection
var projection = d3.geo.albersUsa()
				   .translate([width/2, height/2])    // translate to center of screen
				   .scale([1000]);          // scale things down so see entire US
        
// Define path generator
var path = d3.geo.path()               // path generator that will convert GeoJSON to SVG paths
		  	 .projection(projection);  // tell path generator to use albersUsa projection

// Define linear scale for output
var color = d3.scale.linear()
			  .range(["rgb(213,222,217)","rgb(69,173,168)","rgb(84,36,55)","rgb(217,91,67)"]);

var legendText = ["Upgrade to Primary", "Remained Primary", "Remained Secondary", "No Law"];

//Create SVG element and append map to the SVG
var svg = d3.select("body")
			.append("svg")
			.attr("width", width)
			.attr("height", height);
        
// Append Div for tooltip to SVG
var div = d3.select("body")
		    .append("div")   
    		.attr("class", "tooltip")               
    		.style("opacity", 0);

// Load in my states data!
d3.csv("stateslived.csv", function(data) {
color.domain([0,1,2,3]); // setting the range of the input data
  
// path data
/*d3.json("us-states.json", function(unitedState) {
  var data = topojson.feature(unitedState, unitedState.objects.states).features;
  // our names
  d3.tsv("us-state-names.tsv", function(tsv){
    // extract just the names and Ids
    var names = {};
    tsv.forEach(function(d,i){
      names[d.id] = d.name;
    });*/

// Load GeoJSON data and merge with states data
d3.json("us-states.json", function(json) {

// Loop through each state data value in the .csv file
for (var i = 0; i < data.length; i++) {

// Grab State Name
	var dataState = data[i].state;
  
  // Grab State Abbreviation
  var dataStabb = data[i].id;

// Grab data value 
	var dataValue = data[i].law3;

// Find the corresponding state inside the GeoJSON
	for (var j = 0; j < json.features.length; j++)  {
		var jsonState = json.features[j].properties.name;

if (dataState == jsonState) {

// Copy the data value into the JSON
		json.features[j].properties.visited = dataValue;

// Stop looking through the JSON
		break;
		}
	}
}
		
// Bind the data to the SVG and create one path per GeoJSON feature
svg.selectAll("path")
	.data(json.features)
	.enter()
	.append("path")
	.attr("d", path)
	.style("stroke", "#fff")
	.style("stroke-width", "1")
	.style("fill", function(d) {

// Get data value
	var value = d.properties.visited;

if (value) {
	//If value exists…
	return color(value);
	} else {
	//If value is undefined…
	return "rgb(213,222,217)";
	}
});

// Modified Legend Code from Mike Bostock: https://bl.ocks.org/mbostock/3888852
var legend = d3.select("body").append("svg")
      			.attr("class", "legend")
     			.attr("width", 140)
    			.attr("height", 200)
   				.selectAll("g")
   				.data(color.domain().slice().reverse())
   				.enter()
   				.append("g")
     			.attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; });

legend.append("rect")
   		  .attr("width", 18)
   		  .attr("height", 18)
   		  .style("fill", color);

legend.append("text")
  		  .data(legendText)
      	  .attr("x", 24)
      	  .attr("y", 9)
      	  .attr("dy", ".35em")
      	  .text(function(d) { return d; });
	});

});
</script>
</body>
</html>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js