D3 Examples - Weapons export worldwide

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>Data on weapons exports in the world</title>
        <script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
        <style type="text/css">
            h1,h2,p {
                font-family:"Helvetica";
            }
            
            .axis path,
            .axis line {
                fill: none;
                stroke: black;
                shape-rendering: crispEdges;
            }
            
            .axis text {
                font-family: sans-serif;
                font-size: 11px;
            }
​
            .y.axis path,
            .y.axis line {
                opacity: 0;
            }
        
        </style>
    
    
    </head>
    <body>
        <h1>Who is exporting weapons worldwide?</h1>
        <h2>Data about weapons exports</h2>
        
        <script type="text/javascript">
        
            //Defines a bunch of variables to be used later in the chart, makes life easier when wanting to change some stuff
            
                //1 width and height of the svg element
            var w = 700;
            var h = 1800;
            
                //2 padding variables, defines various white spaces in the chart
            var padding = [ 20, 10, 30, 120 ];  //Top, right, bottom, left
            
                //3 creates the scale for axis, the scale needs to be created before the axis itself
                    //linear scale, basically a scale for continuous numbers,range defines the length of the scale
            var widthScale = d3.scale.linear()
                                .range([ 0, w-padding[1]-padding[3]]);
            
            //console.log(widthScale);
            
                    //ordinal scale, basically a scale for categories,rangeRoundBands defines the position of the top and bottom cat. of the scale, O.1 the space
            var heightScale = d3.scale.ordinal()
                                .rangeRoundBands([ padding[0], h - padding[2]], 0.1);
            
                //4 creates both axis
            var xAxis = d3.svg.axis()
                            .scale(widthScale)
                            .orient("top");
​
            var yAxis = d3.svg.axis()
                            .scale(heightScale)
                            .orient("left");
            
                
            //creates svg element named box
            var svg = d3.select("body").append("svg").attr("width",w).attr("height",h);
            //load the data and bind it to rectangles
            d3.csv("WeaponsExport19952014.csv", function(data) {    
                var bars = svg.selectAll("rect").data(data).enter().append("rect");         
                //defines the input domain for the linear scale
                widthScale.domain([ 0,d3.max(data, function(d) {
                    return +d.Total;
                })]);
                heightScale.domain(data.map(function(d) { return d.Country; } ));
                
                bars.attr("x",padding[3])
                .attr("y",function(d) {
                    return heightScale(d.Country);
                    })
                .attr("width", function(d) {
                    return widthScale(d.Total);
                    })
                //.attr("width",100)    
                .attr("height",heightScale.rangeBand())
                .attr("fill","#9933FF")
                .append("title")
                .text(function(d) {
                    return d.Country + "'s total weapons exports  for the period 1995-2014 is " + d.Total + " TIV";
                });
                
                svg.append("g")
                    .attr("class", "x axis")
                    .attr("transform", "translate(" + padding[3] + "," + padding[0] + ")")
                    .call(xAxis);
​
                svg.append("g")
                    .attr("class", "y axis")
                    .attr("transform", "translate(" + padding[3] + ",0)")
                    .call(yAxis);
            });
            /* */
            
            
        </script>
        
​
    </body>
</html>
    