D3 Examples - module 6: marriage rates

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>Marriage rates</title>
        <script type="text/javascript" src="https://d3js.org/d3.v3.min.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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            circle:hover {
                fill: grey;
            }
            
            .axis path,
            .axis line {
                fill: none;
                stroke: black;
                shape-rendering: crispEdges;
            }
            
            .axis text {
                font-family: sans-serif;
                font-size: 11px;
            }
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        </style>
    </head>
    <body>
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        <h1>Marriage Rate - The City Versus The Average</h1>
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        <p>While the <strong style="color: steelblue;">average Austrian districts'&rsquo;</strong> marriage rate per 1.000 inhabitants stagnates around 4.5, the results for the first district of Vienna, <strong style="color: red;">Innere Stadt&rsquo;s</strong> look like a rollercoaster-ride.</p>
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        <script type="text/javascript">     
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            var w = 700;
            var h = 400;
            var padding = [ 20, 10, 50, 100 ];  //Top, right, bottom, left
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            var dateFormat = d3.time.format("%Y");
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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(10)
                            .tickFormat(function(d) {
                                return dateFormat(d);
                            });
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            var yAxis = d3.svg.axis()
                            .scale(yScale)
                            .orient("left");
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            var line = d3.svg.line()
                .x(function(d) {
                    return xScale(dateFormat.parse(d.year));
                })
                .y(function(d) {
                    return yScale(d.rate);
                });
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            var svg = d3.select("body")
                        .append("svg")
                        .attr("width", w)
                        .attr("height", h);
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            d3.csv("marraigeat.csv", function(atData) {
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                d3.csv("marraigevie.csv", function(vieData) {
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                    var mergedData = atData.concat(vieData);
                    
                    xScale.domain([ 
                        d3.min(mergedData, function(d) {
                            return dateFormat.parse(d.year);
                        }),
                        d3.max(mergedData, function(d) {
                            return dateFormat.parse(d.year);
                        })
                    ]);
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                    yScale.domain([ 
                        d3.max(mergedData, function(d) {
                            return +d.rate;
                        }),
                        0
                    ]);
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                    svg.data([ atData ])
                        .append("path")
                        .attr("class", "line at")
                        .attr("d", line)
                        .attr("fill", "none")
                        .attr("stroke", "steelblue")
                        .attr("stroke-width", 2);
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                    svg.data([ vieData ])
                        .append("path")
                        .attr("class", "line vie")
                        .attr("d", line)
                        .attr("fill", "none")
                        .attr("stroke", "red")
                        .attr("stroke-width", 2);
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​
                    //Axes
                    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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            });
            
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        </script>
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    </body>
</html>
    