D3 Examples - California Counties

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>California Counties: Mercator projection</title>
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        <script type="text/javascript" src="//d3js.org/d3.v3.min.js"></script>
        
        <script type="text/javascript" src="https://use.typekit.com/brf5jpj.js"></script>
        <script src="//use.typekit.net/drk2sev.js"></script>
        <script type="text/javascript">try{Typekit.load();}catch(e){}</script> 
              
        <style type="text/css">
            
            body {
                margin: 0;
                background-color: #48494B;
                font-family: "proxima-nova", "Source Sans Pro", sans-serif;
            }
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            #container {
                width: 800px;
                margin-left: 30px;
                margin-right: auto;
                margin-top: 30px;
                padding: 30px;
                background-color: white;
                box-shadow: 3px 3px 7px #222;
            }
            
            h1 {
                font-size: 24px;
                margin: 0;
            }
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            p {
                font-size: 16px;
                margin: 15px 0 10px 0;
            }
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            a {
              color: #799DCB;
              text-decoration: none;
              transition: color .3s, background .3s, border .3s;
            }
            a:hover {
              color: #48494b;
              background: #e7e8e9;
            }
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            svg {
                background-color: white;
                padding-left: 20px;
            }
            
            path {
                fill: #799dcb;
                stroke: #fff;
                }
            path:hover {
                fill:#48494b;
                cursor:pointer;
            }
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            #tooltip {
                width: 150px;
                height: auto;
                padding: 5px;
                background-color: #fff;
                color: #000;
                -webkit-border-radius: 5px;
                -moz-border-radius: 5px;
                border-radius: 5px;
                -webkit-box-shadow: 3px 3px 8px rgba(0, 0, 0, 0.4);
                -moz-box-shadow: 3px 3px 8px rgba(0, 0, 0, 0.4);
                box-shadow: 3px 3px 8px rgba(0, 0, 0, 0.4);
                pointer-events: none;
                position: absolute;
                }
                
            #tooltip.hidden {
                display: none;
            }
            
            #tooltip p {
            margin: 0;
            font-size: 14px;
            line-height: 18px;
            }
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        </style>
    </head>
    <body>
    
        <body>
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        <div id="container">
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            <h1>Counties of California</h1>
            <p>Source: <a href="https://www.census.gov/geo/maps-data/data/cbf/cbf_counties.html" target="new">U.S. Census Bureau</a></p>
        </div>
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        <div id="tooltip" class="hidden">
            <p>County: <span id="county">County Name</span></p>
        </div>
        <script type="text/javascript">
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            //Width and height
            var w = 760;
            var h = 600;
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            //Define map projection
            var projection = d3.geo.mercator()
                                   .center([ -120, 37 ])
                                   .translate([ w/2, h/2 ])
                                   .scale([ w*3.3 ]);
​
            //Define path generator
            var path = d3.geo.path()
                             .projection(projection);
​
            //Create SVG
            var svg = d3.select("#container")
                        .append("svg")
                        .attr("width", w)
                        .attr("height", h);
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            //Load in GeoJSON data
            d3.json("cb_2014_us_county_5m.json", function(json) {
                console.log(json);
                //Bind data and create one path per GeoJSON feature
                svg.selectAll("path")
                    .data(json.features)
                    .enter()
                    .append("path")
                    .attr("d", path)
                    .on("mouseover", function(d){
                        var xPosition = w/2 + 150;
                        var yPosition = h/2;
//                      var xPosition = parseFloat(path.centroid(this).attr("cx"));
//                      var yPosition = parseFloat(path.centroid(this).attr("cy"));
                        d3.select("#tooltip")
                        .style("left", xPosition + "px")
                        .style("top", yPosition + "px");
                        d3.select("#county")
                        .text(d.properties.NAME);
                        d3.select("#tooltip")
                        .classed("hidden", false);
                        })
                        .on("mouseout", function(){
                        d3.select("#tooltip").classed("hidden", true);
                        });
        
            });
​
​
        
        </script>
    </body>
</html>
    