D3 Examples - Global Hepatitis B immunization coverage among 1-year-olds(%)

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>Global Hepatitis B immunization coverage among 1-year-olds(%)</title>
        <script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
        <style type="text/css">
            
            body {
                background-color: white;
                font-family: Helvetica, Arial, sans-serif;
            }
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            h1 {
                font-size: 24px;
                margin: 0;
            }
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            p {
                font-size: 14px;
                margin: 10px 0 0 0;
            }
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            svg {
                background-color: white;
            }
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            path {
                stroke: gray;
                stroke-width: 1;
            }
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            path:hover{
                stroke: blue;
                storke-width: 2;
            }
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            g.china path {
                stroke: orange;
                stroke-width: 2;
            }
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            g.usa path {
                stroke: green;
                stroke-width: 2;
            }
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            .axis path,
            .axis line {
                fill: none;
                stroke: black;
                stroke-width: 1;
                shape-rendering: crispEdges;
            }
            
            .axis text {
                font-family: sans-serif;
                font-size: 11px;
            }
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        </style>
    </head>
    <body>
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        <h1>Global Hepatitis B immunization coverage among 1-year-olds(%)</h1>
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        <p>This chart showcase the percentage of Hepatitis B immunization coverage. We can see over the years, the coverages has getting better and better.
            The green line is USA and orange line is China.</p>
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        <script type="text/javascript">     
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            var w = 1000;
            var h = 600;
            var padding = [ 20, 10, 50, 100 ];  //Top, right, bottom, left
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            //Set up date formatting and years
            var dateFormat = d3.time.format("%Y");
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​
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            var xScale = d3.time.scale()
                                .range([ padding[3], w - padding[1] - padding[3] ]);
            
            var yScale = d3.scale.linear()
                                .range([ padding[0], h - padding[2] ]);
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​
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            var xAxis = d3.svg.axis()
                            .scale(xScale)
                            .orient("bottom")
                            .ticks(15)
                            .tickFormat(function(d) {
                                return dateFormat(d);
                            });
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            var yAxis = d3.svg.axis()
                            .scale(yScale)
                            .orient("left")
                            .tickFormat(function(d) {
                                return d + "%";
                            });
​
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            var line = d3.svg.line()
                .x(function(d) {
                    return xScale(dateFormat.parse(d.year));
                })
                .y(function(d) {
                    return yScale(+d.amount);
                });
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​
​
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            var svg = d3.select("body")
                        .append("svg")
                        .attr("width", w)
                        .attr("height", h);
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​
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            d3.csv("HBImmunizationCoverage.csv", function(data) {
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                //re-formatting data
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                var years = ["1989", "1990", "1991", "1992", "1993", "1994", "1995", "1996", "1997", "1998", "1999", "2000", "2001", "2002", "2003", "2004", "2005", "2006", "2007", "2008", "2009", "2010", "2011", "2012", "2013"];
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                var dataset = []
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                for(var i=0; i<data.length;i++){
                    dataset[i] = {
                        country: data[i].country,
                        immunization: []
                    }
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                    for(var j=years.length; j>0; j--){
                        if(data[i][years[j]]){
                            //push an object with all the year's data
                            dataset[i].immunization.push({
                                year: years[j],
                                amount: data[i][years[j]]
                            });
                        }
                    }
                }
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                console.log(dataset);
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                xScale.domain([ 
                    d3.min(years, function(d) {
                        return dateFormat.parse(d);
                    }),
                    d3.max(years, function(d) {
                        return dateFormat.parse(d);
                    })
                ]);
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                yScale.domain([ 
                    d3.max(dataset, function(d) {
                        return d3.max(d.immunization, function(d){
                            return +d.amount;
                        })
                    }),
                    0
                ]);
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                var group = svg.selectAll("g")
                    .data(dataset)
                    .enter()
                    .append("g")
                    .classed("china", function(d) {
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                        if (d.country == "China") {
                            return true;
                        } else {
                            return false;
                        }
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                    })
                    .classed("usa", function(d) {
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                        if (d.country == "United States of America") {
                            return true;
                        } else {
                            return false;
                        }
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                    });
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                group.append("title")
                    .text(function(d) {
                        return d.country;
                    });
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                group.selectAll("path")
                    .data(function(d){
                        return [d.immunization];
                    })
                    .enter()
                    .append("path")
                    .attr("class", "line")
                    .attr("d", line)
                    .attr("fill", "none")
                    .attr("storke-width", 1);
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                svg.append("g")
                    .attr("class", "x axis")
                    .attr("transform", "translate(0," + (h - padding[2]) + ")")
                    .call(xAxis);
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                svg.append("g")
                    .attr("class", "y axis")
                    .attr("transform", "translate(" + (padding[3]) + ",0)")
                    .call(yAxis);
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            });
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        </script>
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    </body>
</html>
    