D3 Examples - bar chart with tiered dropdown

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
body { font: 12px Arial;}
​
.bar {
  fill: #0078a5;
}
​
.bar:hover {
  fill: #18b7f2;
}
​
#tooltip {
    position: absolute;
    width: auto;
    height: auto;
    padding: 4px 6px;
    background-color: #fff;
    border:1px solid #eee;
    -webkit-border-radius: 3px;
    -moz-border-radius: 3px;
    border-radius: 3px;
    pointer-events: none;
}
​
#tooltip.hidden {
    display: none;
}
​
#pop{
    background-color: #fff;
    border:1px solid #eee;
}
​
#tooltip p {
    margin: 0;
    font-family: sans-serif;
    font-size: 14px;
}
​
.axis {
  font: 10px sans-serif;
}
​
.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
​
.x.axis path {
  display: none;
}
​
#legendContainer{
    position:absolute;
    top:85px;
    left:10px;
    overflow: auto;
    height:360px;
    width:120px;
    font-family:Helvetica, Arial, sans-serif;
    font-size:11px;
}
#legend{
    width:100px;
    height:200px;
}
.legend {
    font-size: 12px;
    font-weight: normal;
    text-anchor: left;
        cursor: pointer;
}
#bar{
    background:#ccc;
    color:#222;
    padding:8px 15px;
    margin-right:6px;
    border-radius:5px;
    float:left;
    width:20px; 
}
.active{
    background:#0b3774 !important;
    color:#fff !important;
}
#dropdown{
    clear:both;
}
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="//code.jquery.com/jquery-1.10.2.js"></script>
<div id="dropdown">
<div class="ccms_form_element cfdiv_custom" id="indSelectors">
<label>Dimension:</label>
<select size="1" id="dimensions" class=" validate['required']" title="" type="select" name="style">
<option value="">-Select-</option>
<option value="Fruit">Fruit</option>
<option value="Vegetables">Vegetables</option>
</select>
<div class="clear"></div>
<div id="error-message-style"></div>
</div>
<div id="secondaryDrop">
  <div id="Fruit"  class="style-sub-1"  style="display: none;" name="stylesub1">
    <label>Fruit</label>
      <select class="inds">
        <option value="">- Select -</option>
        <option value="apples">apples</option>
        <option value="pears">pears</option>
      </select>
  </div>
  <div id="Vegetables"  class="style-sub-1"  style="display: none;" name="stylesub1">
    <label>Vegetables</label>
      <select class="inds">
        <option value="">- Select -</option>
        <option value="tomatoes">tomatoes</option>
    </select>
  </div>
</div>
<div class="clear"></div>
<div id="error-message-style-sub-1"></div>
</div>
<div id="tertiaryDrop">
  <div id="apples"  class="style-sub-2"  style="display: none;" name="stylesub2">
    <label>Year</label>
      <select class="years">
        <option value="">- Select a Year -</option>
        <option value="1950">1950</option>
        <option value="2000">2000</option>
      </select>
  </div>
  <div id="pears"  class="style-sub-2"  style="display: none;" name="stylesub2">
    <label>Year</label>
      <select class="years">
        <option value="">- Select a Year -</option>
        <option value="2005">1900</option>
        <option value="2010">2015</option>
      </select>
  </div>
  <div id="tomatoes"  class="style-sub-2"  style="display: none;" name="stylesub2">
    <label>Year</label>
      <select class="years">
        <option value="">- Select a Year -</option>
        <option value="2005">2000</option>
        <option value="2010">2015</option>
      </select>
  </div>
    <div class="clear"></div>
    <div id="error-message-style-sub-2"></div>
</div>
</div>
<div id="legendContainer" class="legendContainer">
    <svg id="legend"></svg>
</div>
<div id="tooltip" class="hidden">
    <p><span id="state"></span></p>
</div>
​
<script>
$("#dimensions").change ( function () {
    var targID  = $(this).val ();
    $("div.style-sub-1").hide ();
    $('#' + targID).show ();
} );
​
$(".inds").change ( function () {
    var targID  = $(this).val ();
    $("div.style-sub-2").hide ();
    $('#' + targID).show ();
} );
​
function filterJSON(json, key, value) {
  var result = [];
  for (var foo in json) {
    if (json[foo][key] == value) {
      result.push(json[foo]);
    }
  }
  return result;
}
​
var margin = {top: 20, right: 20, bottom: 130, left: 160},
    width = 1200 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom,
    padding = 0.25;
​
var x = d3.scale.ordinal()
    .rangeRoundBands([0, width - margin.left - margin.right], padding);
​
var y = d3.scale.linear()
    .range([height, 0]);
​
var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");
​
var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
    .ticks(10);
​
var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
​
d3.json("data.json", function(error, json) {
    if (error) throw error;
​
    json.forEach(function(d) {
        d.year = "" + d.year + "";
        d.value = +d.value;
    });
​
                    
    $('.inds')
            .on("change", function () {     
            
                var prod = $(this).val();
          console.log("prod:", prod);
    
                data = filterJSON(json, 'produce', prod);
​
          console.log("data: ", data);
          updateGraph(data);
    
    
                $('.years')
                        .on("change", function () {     
​
                            var yr = $(this).val();
                      yr = +yr;
                      console.log("yr:", yr);
​
                            data1 = filterJSON(data, 'year', yr);
​
                      console.log("data: ", data1);
                      updateGraph(data1);
                        });
                        
    });
​
    
​
});
​
function updateGraph(data) {  
    
    data.sort(function(a,b) {return a.value-b.value;});
​
  x.domain(data.map(function(d) { return d.state; }));
  y.domain([0, d3.max(data, function(d) { return d.value; })]);
​
    var color = d3.scale.category20b(); 
​
  var bars = svg.selectAll(".bar")
      .data(data);
​
    bars
    .enter().append("rect")
      .attr("class", "bar");
​
    bars.transition()
            .attr("id", function(d){ return 'tag'+d.state.replace(/\s+/g, '');})
      .attr("x", function(d) { return x(d.state); })
      .attr("width", x.rangeBand())
      .attr("y", function(d) {return y(d.value); })
      .attr("height", function(d) { return height - y(d.value); });
​
​
    bars.exit().remove();
​
    svg.selectAll(".axis").remove();
​
​
    
    var legend = d3.select("#legend")
                .selectAll("text")
                .data(data);
                
                legend.enter().append("text")
              .attr("x", 0)
              .attr("y", function(d,i){return 10 +i*15;})
              .attr("class", "legend")
                    .style("fill", "#0078a5")
                    .on("click", function(d){
                // Determine if current line is visible 
                d.active = !d.active;
                // Hide or show the elements based on the ID
                d3.select("#tag"+d.state.replace(/\s+/g, ''))
                        .transition()
                        .duration(100) 
                        .style("fill", "#ff3300");
                        
                        var xPosition = parseFloat(d3.select(this).attr("x")) + x.rangeBand() + 100;
                        var yPosition = parseFloat(d3.select(this).attr("y")) / 2 + height / 2;
                        //Update the tooltip position and value
                        d3.select("#tooltip")
                            .style("left", xPosition + "px")
                            .style("top", yPosition + "px")                     
                            .select("#state")
                            .text(d.state + ": " + d.year + ": " + d.value);
                        d3.select("#tooltip").classed("hidden", false);
                    });
​
              legend.transition()
                    .text(function(d){return d.state;}); 
​
                legend.exit().remove();
​
  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("value");
};
​
</script>
​
    