Supermarket Electricity Data

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>Bar Chart, Framed</title>
		<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js"></script>
		<style type="text/css">
			
			body {
				margin: 0;
				background-color: lightGray;
				font-family: Helvetica, Arial, sans-serif;
			}

#container {
				width: 700px;
				margin-left: auto;
				margin-right: auto;
				margin-top: 50px;
				padding: 50px;
				background-color: white;
				box-shadow: 4px 4px 13px 6px #aaa;
			}

h1 {
				font-size: 24px;
				margin: 0;
			}

p {
				font-size: 14px;
				margin: 15px 0 10px 0;
			}

a:link {
				text-decoration: none;
				color: gray;
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a:hover {
				text-decoration: underline;
			}

a:visited {
				color: gray;
			}

a:active {
				color: steelBlue;
			}

svg {
				background-color: white;
			}

g.bar {
                stroke: none;
                /*stroke-width: 0.5px;*/
                cursor: pointer;
            }

g.bar text.label {
				font-size: 7px;
				fill: black;
				text-anchor: end;
			}
            
			g.bar text.tooltip {
                font-family: Consolas,sans-serif;
				font-size: 13px;
			}

g.bar text.tooltip {
                stroke: #333;
                stroke-width: 0.2px;
				font-weight: normal;
				text-anchor: start;
				opacity: 0;
                fill: white;
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g.bar:hover rect {
				fill: orange;
			}

g.bar:hover text.tooltip {
				opacity: 1;
			}
			
			.axis path,
			.axis line {
				fill: none;
				stroke: black;
				shape-rendering: crispEdges;
			}
			
			.axis text {
				font-family: sans-serif;
				font-size: 9px;
			}

.y.axis text {
                font-size: 8px;
            }

.y.axis path,
			.y.axis line {
				opacity: 0;
			}

</style>
	</head>
	<body>

<div id="container">
			<h1>WF Electricity</h1>
			<p>Some supermarket electricity consumption data. V2.4 SM :-)</p>
            <button onclick="javascript:alphaSort(); void(0);">Sort Alpha</button> | <button onclick="javascript:kwhSort(); void(0);">Sort kWh/SF</button> 
		</div>

var w = 700;
			var h = 800;
			var padding = [ 20, 10, 30, 120 ];  //Top, right, bottom, left

var widthScale = d3.scale.linear()
								.range([ 0, w - padding[1] - padding[3] ]);
			
			var heightScale = d3.scale.ordinal()
								.rangeRoundBands([ padding[0], h - padding[2] ], 0.1);

//			var heightScale = d3.scale.linear()
//								.range([0,100]);

var xAxis = d3.svg.axis()
							.scale(widthScale)
							.orient("bottom");

var yAxis = d3.svg.axis()
							.scale(heightScale)
							.orient("left");
							// .tickFormat(function(d) {
							// 	return d.Location;
							// });

//Now SVG goes into #container instead of body
			var svg = d3.select("#container")
						.append("svg")
						.attr("width", w)
						.attr("height", h);

d3.csv("wf-01-electricity.csv", function(data) {
			 
                //var data2 = data;

//Determines default sort order
				data.sort(function(a, b) {
					return d3.descending(+a.EL201502, +b.EL201502);
				});
                                 
				widthScale.domain([ 0, d3.max(data, function(d) {
					return +d.EL201502;
				}) ]);

heightScale.domain(d3.range(data.length));

//Bind data to groups (not bars directly)
				var groups = svg.selectAll("g")
								.data(data)
								.enter()
								.append("g")
								.attr("class", "bar")
								.attr("transform", function(d, i) {
									return "translate(" + padding[3] + "," + heightScale(i) + ")";	
								});

//Add a rect to each group
				var rects = groups.append("rect")
					.attr("x", 0)
					.attr("y", 0)
					.attr("width", 0)
					.attr("height", heightScale.rangeBand())
					.attr("fill", "steelblue");

//Add a text element / label to each group
				groups.append("text")
					.attr("class", "label")
					.attr("x", -3)
					.attr("y", 5)
					.text(function(d) {
						return d.Location;
					});

//Add a text element / tooltip to each group
				groups.append("text")
					.attr("class", "tooltip")
					.attr("x", 0)
					.attr("y", 0)
					.text(function(d, i) {
						return i + ' ' + d.EL201502 + ' (' + d.Location + ')';
					});

rects.transition()
					.delay(function(d, i) {
						return i;
					})
					.duration(100)
					.attr("width", function(d) {
						return widthScale(d.EL201502);
					});

svg.append("g")
					.attr("class", "x axis")
					.attr("transform", "translate(" + padding[3] + "," + (h - padding[2]) + ")")
					.call(xAxis);

// svg.append("g")
				// 	.attr("class", "y axis")
				// 	.attr("transform", "translate(" + padding[3] + ",0)")
				// 	.call(yAxis);
                    
			});
            
            function alphaSort() {

d3.selectAll('g.bar')
                    .sort(function(a, b) {
                        return d3.ascending(a.Location, b.Location);
                    })
                    .transition()
                    .duration(1000)
                    .attr("transform", function(d, i) {
						return "translate(" + padding[3] + "," + heightScale(i) + ")";	
					});
             
            }

function kwhSort() {

// This works but isn't useful.
                //widthScale.domain([ 0, 10 ]);
                
                // This is killing me.  How do I access the 'data' from here inside a function, knowing that data was created with a different scope? 
                //widthScale.domain([ 0, d3.max(d3.selectAll(data), function(d) {
				//   return +d.EL201502/d.SqFt;
			    //}) ]);

d3.selectAll('g.bar')
                    .sort(function(a, b) {
						return d3.descending(+a.EL201502, +b.EL201502);
					})
                    .transition()
                    .duration(1000)
                    .attr("transform", function(d, i) {
						return "translate(" + padding[3] + "," + heightScale(i) + ")";	
					});
                    
            }

</script>

</body>
</html>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js