"Struggling to generate a legend for my bubble chart in d3. The legend simply isn't appearing

I'm attempting to enhance the Clustered Bubble Chart with a legend that corresponds to the color of each cluster. However, my current approach isn't yielding any results.

Within my CSV file, I've established 5 clusters distinguished by various colors. My goal is to label and color-code each cluster individually.

While there are no syntax errors in the code, the visualization remains blank. Could someone review the code to identify what's causing this issue? Additionally, do you have any recommendations for incorporating a legend into the bubble chart?

<!DOCTYPE html>
<meta charset="utf-8">
<style type="text/css">
text {
  font: 10px sans-serif;
}
circle {
    stroke: #565352;
    stroke-width: 1;
}
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>

var width = 1000,
    height = 1000,
    padding = 1.5, // separation between nodes of the same color
    clusterPadding = 6, // separation between nodes of different colors
    maxRadius = 65;

var color = d3.scale.ordinal()
      .range(["#5499C7", "#8E44AD", "#138D75", "#F1C40F", "#D35400"]);

// Remaining JavaScript code...
javascriptd3.jsvisualizationlegendbubble-chart

Answer №1

The color.domain array remains empty initially as it is joined with the .legend selection, resulting in no 'g' elements being appended.

It's only later in your code that the color.domain array gets populated when circles are added to your nodes selection.

If you were to swap the order of operations, the legend items would be successfully created:

var node = svg
  .selectAll('circle')
  .data(nodes)
  .enter()
  .append('g')
      .call(force.drag)

////MOVED BEFORE THE LEGEND CODE
node
  .append('circle')
  .style('fill', function (d) {
    return color(d.cluster)
  })
  .attr('r', function (d) {
    return d.radius
  })

var legend = svg
  .selectAll('.legend')
  .data(color.domain())
  .enter()
  .append('g')
  .attr('class', 'legend')
  .attr('transform', function (d, i) {
    var height = legendRectSize + legendSpacing
    var offset = height * color.domain().length / 2
    var horz = -2 * legendRectSize
    var vert = i * height - offset
    return 'translate(' + horz + ',' + vert + ')'
  })

legend
  .append('rect')
  .attr('width', legendRectSize)
  .attr('height', legendRectSize)
  .style('fill', color)
  .style('stroke', color)

legend
  .append('text')
  .attr('x', legendRectSize + legendSpacing)
  .attr('y', legendRectSize - legendSpacing)
  .text(function (d) {
    return 'Hans'
  })

PS: Some of the legend items may be positioned outside the SVG view, so make sure to review your horz and vert variables for accurate placement.

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