Using HTML select element with D3 for axis/axes transitions

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<html  xmlns="https://www.w3.org/1999/xhtml"
       xml:lang="en-US"
       lang="en-US">
  <head profile="https://www.w3.org/2005/10/profile">
    <title>IF4IT Sample Charts Web Page</title>
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
    <meta name="Description" content="This page tries to mix charts with html formatting and layout constructs." />
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    <meta http-equiv="expires" content="-l" />

// d3.select(self.frameElement).style("height", "1000px"); 
      // d3.select(self.frameElement).style("width", "1200px");

// DATA FOR EXAMPLES
      mixedDataSet = [
        {"System": "System A", "Severity": "Critical", "Owned By": "Business", "Business Domain": "Sales"},
        {"System": "System D", "Severity": "High", "Owned By": "Business", "Business Domain": "Marketing"},
        {"System": "System N", "Severity": "Low", "Owned By": "Business", "Business Domain": "Marketing"},
        {"System": "System C", "Severity": "Critical", "Owned By": "IT", "Business Domain": "Sales"},
        {"System": "System L", "Severity": "Critical", "Owned By": "IT", "Business Domain": "NO_DATA"},
        {"System": "System M", "Severity": "High", "Owned By": "IT", "Business Domain": "Sales"},
        {"System": "System B", "Severity": "Medium", "Owned By": "NO_DATA", "Business Domain": "Support"},
        {"System": "System F", "Severity": "Low", "Owned By": "Partner", "Business Domain": "Support"},
        {"System": "System E", "Severity": "Low", "Owned By": "Business", "Business Domain": "Sales"},
        {"System": "System I", "Severity": "Medium", "Owned By": "IT", "Business Domain": "Sales"},
        {"System": "System J", "Severity": "NO_DATA", "Owned By": "Partner", "Business Domain": "NO_DATA"},
        {"System": "System K", "Severity": "High", "Owned By": "Partner", "Business Domain": "Manufacturing"},
        {"System": "System H", "Severity": "Low", "Owned By": "IT", "Business Domain": "Sales"},
        {"System": "System G", "Severity": "Low", "Owned By": "Business", "Business Domain": "Manufacturing"}
      ];

// FUNCTIONS

function drawChart( dataSet, selectString )
      {

// Initalization of variables
        var flag = true;
        var w = 500;
        var h = 400;
        var marginLeft = 10;
        var marginRight = w - 10;
        var marginTop = 20;
        var marginBottom = h - 20;

// Determine axis keys
        // Will be used for values in dropdown/select menus
        var axisKeys = Object.getOwnPropertyNames(dataSet[0]).sort();

// Set up a hash by name of axis values to initialize X Axis
        var xAxisDataHash = [];
        dataSet.forEach( function(d, i){
            xAxisDataHash[d[axisKeys[0]]] = d[axisKeys[0]];
          }
        );
        
        // LOCAL FUNCTIONS
        function keys(obj)
          {
            var keys = [];

for(var key in obj)
            {
              if(obj.hasOwnProperty(key))
              {
                keys.push(key);
              }
            }
          return keys;
        }

var swapAxes = function()
        {

//CAPTURE NEW DROPDOWN VALUES HERE

var xIndex = document.getElementById("xSelectMenu");
          var xCategoryValue = xIndex.options[xIndex.selectedIndex].value;
          var yIndex = document.getElementById("ySelectMenu");
          var yCategoryValue = yIndex.options[yIndex.selectedIndex].value;

// Set up a hash by name of axis values to initialize X Axis and Y Axis
          var xAxisData = [];
          var yAxisData = [];
          dataSet.forEach( function(d, i){
              xAxisData[d[xCategoryValue]] = d[xCategoryValue];
              yAxisData[d[yCategoryValue]] = d[yCategoryValue];
            }
          );

var color;
          if (flag){
            color = "red";
          } else {
            color = "black";
          }
          flag = !flag

// Create new scales
          xAxisScale = d3.scale.ordinal().domain(xAxisData).rangeRoundBands([0, (marginRight-100)], 1);
          yAxisScale = d3.scale.ordinal().domain(yAxisData).rangeRoundBands([marginBottom-20, marginTop], 1);

// Apply new X axis values
          xAxis = d3.svg.axis().scale(xAxisScale).orient("bottom");
          var xTransitions = innerCanvas.selectAll(".x.axis")
            .transition()
            .duration(2000)
              .delay(200)
              .attr("fill", color)
              .attr("transform", "translate(0,354)")
            .call(xAxis);

// Apply new Y axis values
          yAxis = d3.svg.axis().scale(yAxisScale).orient("left");
          var yTransitions = innerCanvas.selectAll(".y.axis")
            .transition()
            .duration(2000)
              .delay(200)
              .attr("fill", color)
            .call(yAxis);

};

var lineFunction = d3.svg.line()
          .x(function(d) { return d.x; })
          .y(function(d) { return d.y; })
          .interpolate("linear");

// Initialize data for, both, xAxisData and yAxisData
        var xAxisData = keys(xAxisDataHash).sort();
        var yAxisData = xAxisData; // For now, set yAxisData to xAxisData

// Set up Y Axis Dropdown/Selector Menu
        var ySelectText = d3.select(selectString)
          .append("span")
            .text("Y Axis Category:");
        var ySelect = d3.select(selectString)
          .append("select")
            .attr("id", "ySelectMenu");

// Set up X Axis Dropdown/Selector Menu
        var xSelectText = d3.select(selectString)
          .append("span")
            .text("     X Axis Category:");
        var xSelect = d3.select(selectString)
          .append("select")
            .attr("id", "xSelectMenu");

// Set up the "Go" button to select Axes values
        var controlButton = d3.select(selectString)
          .append("button")
            .attr("id", "axisControlButton")
            //.attr("class", "button")
            .on("click", swapAxes)
            .text("Go");

// Create SVG canvas
        var canvas = d3.select(selectString).append("svg")
            .attr("height", h)
            .attr("width", w)

// Put a border around the canvas for visual effects
        canvas.append("path")
            .attr("d", lineFunction(lineData))
            .attr("stroke", "blue")
            .attr("stroke-width", 4)
            .attr("fill", "none");

// InnerCanvas is the offset canvas, that is offset away
        // from the margins, using the transform/translate for the
        // entire canvas, instead of just for individual axis.
        var innerCanvas = canvas.append("g")
            .attr("transform", "translate(60,10)");

// Setup y axis : Range is the length of the line
        // NOTE: A value of "1" for rangeRoundBands allows points
        // to be centered over the ordinal text markers
        var yAxisScale = d3.scale.ordinal().domain(yAxisData).rangeRoundBands([marginBottom-20, marginTop], 1);
        var yAxis = d3.svg.axis().scale(yAxisScale).orient("left");
        var yAxisGroup = innerCanvas.append("g")
            .attr("class", "y axis")
            .call(yAxis);

// Setup x axis : Range is the length of the line
        // NOTE: A value of "1" for rangeRoundBands allows points
        // to be centered over the ordinal text markers
        var xAxisScale = d3.scale.ordinal().domain(xAxisData).rangeRoundBands([0, (marginRight-100)], 1);
        var xAxis = d3.svg.axis().scale(xAxisScale).orient("bottom");
        var xAxisGroup = innerCanvas.append("g")
            .attr("class", "x axis")
            .attr("transform", "translate(0,354)")
          .call(xAxis);

};

</script>

.button {
        background-color: #4CAF50; /* A lighter Green */
        border: none;
        color: white;
        cursor: pointer;
        padding: 10px 10px; /* Controls text padding inside button: y and x */
        text-align: center;
        text-decoration: none;
        display: inline-block;
        font-size: 16px;
      }

/* unvisited link */
      a:link {
        color: "blue";
        text-decoration: none;
      }

/* visited link */
      a:visited {
        color: "darkblue";
        text-decoration: none;
      }

/* mouse over link */
      a:hover {
        color: "maroon";
        text-decoration: none;
      }

/* selected link */
      a:active {
        color: "maroon";
        text-decoration: none;
      }

div.div_Header {
        width: 100%;
        border:2px solid White;
        border-radius:7px;
        background: WhiteSmoke;
        font: bold 14px Arial;
        font-family:Arial, Helvetica, sans-serif;
        color:WhiteSmoke;
        text-align:center;
      }
      h1.h1_BodyHeader {
        text-align:center;
        font: bold 1.5em Arial;
      }
      h2.h2_LeftMenuHeader {
        text-align:center;
        font: bold 1.2em Arial;
      }
      h3.h3_Body {
        text-align:center;
      }
      p.p_Red {
        color:Red;
      }
      table.table_Header {
        width: 100%;
        text-align:center;
      }
      td.td_HeaderLeft {
        text-align:left;
      }
      td.td_HeaderRight {
        text-align:right;
      }
      div.div_Menu {
        width: 100%;
        border:2px solid White;
        border-radius:7px;
        background: MidnightBlue;
        font: bold 14px Arial;
        font-family:Arial, Helvetica, sans-serif;
        color:White;
        text-align:center;
      }
      p.p_Left {
        font-family:Arial, Helvetica, sans-serif;
        color:Black;
        text-align:left;
        padding-left: 5px;
        font: normal 14px Arial;
      }
      table.table_Body {
        width: 100%;
        height: 100%;
        padding: 0;
      }
      td.td_BodyLeft {
        width: 250px;
        height: 100%;
        padding: 0;
      }
      td.td_BodyRight {
        vertical-align: top;
      }
      li.li_LeftMenu {
        text-align:left;
        font: normal 14px Arial;
      }
      a.a_LeftMenuNoUnderLine {
        text-decoration:  none;
      }
      div.div_Body {
        height: 100%;
        width: 100%;
        position: relative;
        border:2px solid White;
        border-radius:7px;
        background: WhiteSmoke;
        font: bold 14px Arial;
        font-family:Arial, Helvetica, sans-serif;
        color:Black;
        text-align:center;
      }
      div.div_Footer {
        width: 100%;
        border:2px solid White;
        border-radius:7px;
        background: MidnightBlue;
        font: bold 14px Arial;
        font-family:Arial, Helvetica, sans-serif;
        color:White;
        text-align:center;
      }
      p.p_if4itMessage {
        width: 100%;
        background: White;
        font: bold .75em Arial;
        font-family:Arial, Helvetica, sans-serif;
        color:GoldenRod;
        text-align:center;
      }
      .menuButton{
        background-color: MidnightBlue;
      }
      .menuButton li{
        height: 100%;
        list-style: none;
        display: inline;
      }
      .menuButton li a{
        height: 100%;
        padding: 3px 0.5em;
        text-decoration: none;
        color: White;
        background-color: MidnightBlue;
        border: 2px solid MidnightBlue;
      }
      .menuButton li a:hover{
        height: 100%;
        color: MidnightBlue;
        background-color: White;
        border-style: outset;
        background-color: White;
      }
      .menuButton li a:active{
        height: 100%;
        border-style: inset;
        color: MidnightBlue;
        background-color: White;
      }
      .menuButton li a.disabled{
        height: 100%;
        padding: 3px 0.5em;
        text-decoration: none;
        color: MidnightBlue;
        background-color: White;
        border: 2px solid MidnightBlue;
        border-style: inset;
        border-color: White;
      }
    </STYLE>

<STYLE type="text/css">
      div.div_RootBody {
        position: relative;
        border:2px solid White;
        border-radius:7px;
        background: WhiteSmoke;
        font: normal 14px Arial;
        font-family:Arial, Helvetica, sans-serif;
        color:Black;
        padding: 0px 1em;
        text-align:left;
      }
    </STYLE>
    
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          </td>
          <td class="td_BodyRight">
            <div class="div_RootBody">
              <h1 style="text-align:center; font: bold 1.5em Arial;">D3 Transitioning Axis/Axes</h1>
            </div>

<div class="div_RootBody">
              <h3>Transitions X Axis text from an HTML dropdown menus:</h3>
              <div id="chart1"></div>
            </div>

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Modified http://mbostock.github.com/d3/d3.js?2.4.5 to a secure url

https://mbostock.github.com/d3/d3.js?2.4.5