D3-select-axis-vars.html

<div id="plot-wrapper" style="position: relative;">
  <svg id="plotSVG" width=700 height=500></svg>
  <select id="select-y-var" style="position: absolute; top:0px; left:0px;">
    <option value="reads" selected>reads</option>
    <option value="claps">claps</option>
    <option value="upvotes">fans</option>
    <option value="views">views</option>
    <option value="internalReferrerViews">internal views</option>
  </select>
  <select id="select-x-var" style="position: absolute; bottom:0px; left: 600px;">
    <option value="views" selected>views</option>
    <option value="claps">claps</option>
    <option value="upvotes">fans</option>
    <option value="internalReferrerViews">internal views</option>
    <option value="reads">reads</option>
    <option value="firstPublishedAt">date</option>
    <option value="publication">publication</option>
  </select>
</div>