Items by Name HW

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="jquery-3.2.1.min.js"></script>  
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    .axis .domain {
  display: none;
	}
  </style>
</head>
<body>
<select id="menu">
	<option value="all">All items</option>
	<option value="Pens">Pens</option>
	<option value="Carrots">Carrots</option>
	<option value="Phones">Phones</option>
 </select>
  
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>

// render code was right, update was wrong
// get the update code correct, and call the update code on the initial render
// that way when you call it on the initial load it should call the correct thing

var svg = d3.select("svg"),
    margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom,
    g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")");

d3.csv("items.csv", function(d, i, columns) {
  for (i = 1, t = 0; i < columns.length; ++i) t += d[columns[i]] = +d[columns[i]];
  d.total = t;
  return d;
}, function(error, data) { 
  if (error) throw error;
  
  var originalData = data;
  var keys = data.columns.slice(1);
  var originalKeys = keys;

// Sort the bars so they show up tallest to shortest
  // Might have to move this into the update function?
  data.sort(function(a, b) { return b.total - a.total; }); 
    
   // Set scales
var xScale = d3.scaleBand()
		.domain(data.map(function(d) { return d.name; }))
    .rangeRound([0, width])
    .paddingInner(0.05)
    .align(0.1);

var yScale = d3.scaleLinear()
		.domain([0, d3.max(data, function(d) { return d.total; })]).nice()
    .rangeRound([height, 0]);

g.append("g")
      .attr("class", "axis")
      .call(d3.axisLeft(yScale).ticks(null, "s"))
    .append("text")
      .attr("x", 2)
      .attr("y", yScale(yScale.ticks().pop()) + 0.5)
      .attr("dy", "0.32em")
      .attr("fill", "#000")
      .attr("font-weight", "bold")
      .attr("text-anchor", "start")
      .text("Items");
 
  var legend = g.append("g")
      .attr("font-family", "sans-serif")
      .attr("font-size", 10)
      .attr("text-anchor", "end")
    .selectAll("g")
    .data(keys.slice().reverse())
    .enter().append("g")
      .attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; });

legend.append("rect")
      .attr("x", width - 19)
      .attr("width", 19)
      .attr("height", 19)
      .attr("fill", colorScale);

legend.append("text")
      .attr("x", width - 24)
      .attr("y", 9.5)
      .attr("dy", "0.32em")
      .text(function(d) { return d; });
  }

// getters 
  function getItemData(data, item) {
      if (item == "all") {
				return originalData;
				}
			else if (item == "Pens") {
        array = []
        for (var i in data) {
          array.push({ name: data[i].name, pens: data[i].pens })
        }
        return array;
				}
      else if (item == "Carrots") {
        array = []
        for (var i in data) {
          array.push({ name: data[i].name, carrots: data[i].carrots })
        }
        return array;
				}
      else if (item == "Phones") {
        array = []
        for (var i in data) {
          array.push({ name: data[i].name, phones: data[i].phones })
        }
        return array;
				}
		}
  
    function getKeys(data, item) {
      if (item == "all") {
				return originalKeys;
				}
			else if (item == "Pens") {
        return ["name", "pens"];
				}
      else if (item == "Carrots") {
        return ["name", "carrots"];
				}
      else if (item == "Phones") {
        return ["name", "phones"];
				}
		}
    
    // update
    function update(data) {
      var data = getItemData(data, d3.select("#menu").property("value"));
     	var keys = getKeys(data, d3.select("#menu").property("value"));
     // for cleanliness, deal with the global key too
     // Data join
      chart();
	var bars = g.selectAll("rect")
		  .data(d3.stack().keys(keys)(data))
/*
  	// Exit

//Append things
  g.append("g")
    .selectAll("g")
    .data(d3.stack().keys(keys)(data))
    .enter().append("g")
    .attr("fill", function(d) { return colorScale(d.key); })
  
  var rect = bars.selectAll("rect")
    .data(function(d) { return d; })
    .enter().append("rect")
    .attr("x", function(d) { return xScale(d.data.name); }) 
    .attr("y", function(d) { return yScale(d[1]); })
    .attr("height", function(d) { return yScale(d[0]) - yScale(d[1]); })
    .attr("width", xScale.bandwidth());
    */
}
  
  	// use update to call the initial render
  	update(data);
  
    // listener
    d3.select("#menu")
			.on("change", function(d) {

update(data);
			});
  });
</script>
</body>

https://d3js.org/d3.v4.min.js