Tips for choosing elements based on a specific attribute (such as fill color) in D3.js using the SelectAll method

I have various sets of circles on a map - 10 red circles, 10 blue circles, and 10 green circles. Is there a way to use d3 selectAll or select to specifically choose only the red circles?

Are there any alternative methods for achieving this?

The color of each circle is determined by the "fill" value in the "style" attribute:

feature = g.selectAll("circle")
    .data(data)
    .enter().append("circle")
    .attr("id", function (d) {
    return d.ArtistID + d.FollowerID;
})
    .style("stroke", "black")
    .style("opacity", .6)
    .style("fill", function (d) {
    if (d.ArtistID == 1) {
        return "red"
    } else if (d.ArtistID == 2) {
        return "blue"
    } else {
        return "green"
    };
})
    .attr("r", 10);

This results in the circles being drawn as follows:

<circle id="10" r="10" transform="translate(695,236)" style="stroke: rgb(0, 0, 0); opacity: 0.6; fill: rgb(255, 0, 0);"></circle>

I am seeking assistance in selecting only the red circles. Can anyone provide guidance?

Thank you in advance.

javascriptcssd3.js

Answer №1

If you need to choose based on the value of the style, then keep in mind that the fill property is within the style attribute, not a direct attribute of the DOM node. This means that you cannot select it using an attribute selector as suggested by @LarsKotthoff.

To address this, consider utilizing the SVG fill attributes for setting the fill with .attr('fill', ...) instead of style('fill'). By doing so, you can later select it using an attribute selector if needed.

In addition, selecting by the fill attribute may not be the most elegant solution. If your design changes and a different fill color is used, you will also have to modify the attribute selector accordingly. It might be more suitable to assign a class and select based on the class.

An alternative approach could be selecting based on data. For example:

g.selectAll('circle')
  .filter(function(d) { return d.ArtistID == 1; })
  .style('fill', function(d, i) {
    // here you can target only the red circles (as their ArtistID is 1)
  })

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