D3.js pie.sort() Function

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The pie.sort() function in D3.js is used to sort the data objects based on different properties of data. The comparator function can be used to define the basis on which the sorting would be done.

Syntax:

pie.sort( compare )

Parameters: This function accepts a single parameter as mentioned above and described below:

compare: This takes a comparison function to sort data objects on different properties. It is an optional parameter.

Return Values: This function does not return anything.

Below example illustrates the pie.sort() function in D3.js:

Example 1:

HTML

<!DOCTYPE html> 
<html> 
<head> 
  <script src= 
"https://d3js.org/d3.v6.min.js"> 
  </script> 
</head> 
<body> 
  <div style="width:300px; 
              height:300px;"> 
    <center> 
      <h1 style="color:green"> 
        zambiatek 
      </h1> 
      <h2> 
        pie.sort() 
      </h2> 
      <h3> 
        When given data array  
        consists objects 
      </h3> 
    </center> 
    <svg width="300" height="250"> 
    </svg> 
    <button>Click Me</button> 
  </div> 
  <script> 
    // Data to be added in the pie chart 
    var data = [ 
      { "value": 11, "property": "dp1" }, 
      { "value": 12, "property": "bp2" }, 
      { "value": 32, "property": "ap3" }, 
      { "value": 14, "property": "np4" }, 
      { "value": 5, "property": "fp5" }, 
      { "value": 16, "property": "gp6" } 
    ] 
  
    // Selecting SVG using d3.select() 
    var svg = d3.select("svg"); 
  
    // Creating Pie generator 
    var pie = d3.pie() 
      // Using the pie.value() Function 
      .value((d) => { return d.value }) 
      (data); 
  
    function updatePie() { 
      // Creating Pie generator 
      var pie = 0 
      var pie = d3.pie() 
        
        .value((d) => { return d.value }) 
  
        // Using the pie.sort() Function 
        .sort(function (a, b) { 
          return b.property 
            .localeCompare(a.property); 
        }) 
        (data); 
      // Creating arc 
      var arc = d3.arc() 
        .innerRadius(50) 
        .outerRadius(100); 
  
      let g = svg.append("g") 
        .attr("transform", "translate(150,120)"); 
  
      // Grouping different arcs 
      var arcs = g.selectAll("arc") 
        .data(pie) 
        .enter() 
        .append("g"); 
  
      // Appending path  
      arcs.append("path") 
        .attr("fill", (data, i) => { 
          return d3.schemeSet2[i]; 
        }) 
        .attr("d", arc); 
  
      arcs.append("text") 
        .attr("transform", (d) => { 
          return "translate(" + 
            arc.centroid(d) + ")"; 
        }) 
        .text(function (d) { 
          return d.value; 
        }); 
    } 
    let btn = document.querySelector("button") 
    btn.addEventListener("click", updatePie); 
  
    // Creating arc 
    var arc = d3.arc() 
      .innerRadius(50) 
      .outerRadius(100); 
  
    let g = svg.append("g") 
      .attr("transform", "translate(150,120)"); 
  
    // Grouping different arcs 
    var arcs = g.selectAll("arc") 
      .data(pie) 
      .enter() 
      .append("g"); 
  
    // Appending path  
    arcs.append("path") 
      .attr("fill", (data, i) => { 
        return d3.schemeSet2[i]; 
      }) 
      .attr("d", arc); 
  
    arcs.append("text") 
      .attr("transform", (d) => { 
        return "translate(" + 
          arc.centroid(d) + ")"; 
      }) 
      .text(function (d) { 
        return d.value; 
      }); 
  </script> 
</body> 
</html>

Output:

Before clicking the button:

After clicking the button:

Example 2:

HTML

<!DOCTYPE html> 
<html> 
<head> 
  <script src= 
"https://d3js.org/d3.v6.min.js"> 
  </script> 
</head> 
<body> 
  <div style="width:300px; 
              height:300px;"> 
    <center> 
      <h1 style="color:green"> 
        zambiatek 
      </h1> 
      <h2> 
        pie.sort() 
      </h2> 
      <h3>Sorting values: </h3> 
    </center> 
    <svg width="300" height="250"> 
    </svg> 
    <button>Click Me</button> 
  </div> 
  <script> 
    // Data to be added in the pie chart 
    var data = [ 
      { "value": 11, "property": "dp1" }, 
      { "value": 12, "property": "bp2" }, 
      { "value": 32, "property": "ap3" }, 
      { "value": 14, "property": "np4" }, 
      { "value": 5, "property": "fp5" }, 
      { "value": 16, "property": "gp6" } 
    ] 
  
    // Selecting SVG using d3.select() 
    var svg = d3.select("svg"); 
  
    // Creating Pie generator 
    var pie = d3.pie() 
      // Use of pie.value() Function 
      .value((d) => { return d.value }) 
      (data); 
  
    function upadtePie() { 
      // Creating Pie generator 
      var pie = 0 
      var pie = d3.pie() 
        .value((d) => { return d.value }) 
  
        // Using the pie.sort() Function 
        .sort(function (a, b) { 
          return b.value > a.value; 
        }) 
        (data); 
      // Creating arc 
      var arc = d3.arc() 
        .innerRadius(50) 
        .outerRadius(100); 
  
      let g = svg.append("g") 
        .attr("transform", "translate(150,120)"); 
  
      // Grouping different arcs 
      var arcs = g.selectAll("arc") 
        .data(pie) 
        .enter() 
        .append("g"); 
  
      // Appending path  
      arcs.append("path") 
        .attr("fill", (data, i) => { 
          return d3.schemeSet2[i]; 
        }) 
        .attr("d", arc); 
  
      arcs.append("text") 
        .attr("transform", (d) => { 
          return "translate(" + 
            arc.centroid(d) + ")"; 
        }) 
        .text(function (d) { 
          return d.value; 
        }); 
    } 
    let btn = document.querySelector("button") 
    btn.addEventListener("click", upadtePie); 
    // Creating arc 
    var arc = d3.arc() 
      .innerRadius(50) 
      .outerRadius(100); 
  
    let g = svg.append("g") 
      .attr("transform", "translate(150,120)"); 
  
    // Grouping different arcs 
    var arcs = g.selectAll("arc") 
      .data(pie) 
      .enter() 
      .append("g"); 
  
    // Appending path  
    arcs.append("path") 
      .attr("fill", (data, i) => { 
        return d3.schemeSet2[i]; 
      }) 
      .attr("d", arc); 
  
    arcs.append("text") 
      .attr("transform", (d) => { 
        return "translate(" + 
          arc.centroid(d) + ")"; 
      }) 
      .text(function (d) { 
        return d.value; 
      }); 
  </script> 
</body> 
</html>