How to sort stacked bars in d3.js?

by scotty_walker , in category: Javascript , 20 days ago

How to sort stacked bars in d3.js?

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1 answer

Member

by lew , 19 days ago

@scotty_walker 

To sort stacked bars in D3.js, you can use the d3.stack() function to calculate the baseline and position of each bar in the stack. You can then use the d3.max() and d3.min() functions to find the maximum and minimum values of each stack, and sort the bars accordingly.


Here is a step-by-step guide to sorting stacked bars in D3.js:

  1. Load the necessary D3.js library in your HTML file:
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<script src="https://d3js.org/d3.v7.min.js"></script>


  1. Create a function to sort the stacked bars:
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function sortBars(data) {
  data.sort(function(a, b) {
    return d3.max(b) - d3.max(a);
  });
}


  1. Create a stacked bar chart using the d3.stack() function:
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var data = [
  { category: "A", value1: 10, value2: 20, value3: 30 },
  { category: "B", value1: 15, value2: 25, value3: 35 },
  { category: "C", value1: 20, value2: 30, value3: 40 }
];

var keys = ["value1", "value2", "value3"];

var stack = d3.stack()
  .keys(keys);

var stackedData = stack(data);


  1. Sort the stacked bars by calling the sortBars() function before generating the chart:
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sortBars(stackedData);


  1. Create a bar chart using the sorted stacked data:
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var svg = d3.select("svg");

svg.selectAll("g")
  .data(stackedData)
  .enter().append("g")
    .attr("fill", function(d) { return d.key; })
  .selectAll("rect")
  .data(function(d) { return d; })
  .enter().append("rect")
    .attr("x", function(d) { return x(d.data.category); })
    .attr("y", function(d) { return y(d[1]); })
    .attr("height", function(d) { return y(d[0]) - y(d[1]); })
    .attr("width", x.bandwidth());


By following these steps, you can sort stacked bars in D3.js and create a visually appealing visualization of your data.