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D3.js stack.keys() Method
  • Last Updated : 07 Sep, 2020

The stack.keys() method makes an array of strings as an argument and returns the stack generator.

Syntax:

 stack.keys([keys])

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

  • domain: This parameter holds an array of strings as key arguments.

Return Value: This method returns the stack generator.

Example:



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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <script src=
        "https://d3js.org/d3.v5.min.js">
    </script>
</head>
  
<body>
    <h1 style="text-align: center; color: green;">
        GeeksforGeeks
    </h1>
    <center>
        <canvas id="gfg" width="200" height="200">
        </canvas>
    </center>
  
    <script>
        var data = [
              {a: 3840, b: 1920, c: 960, d: 400},
              {a: 1600, b: 1440, c: 960, d: 400},
              {a:  640, b:  960, c: 640, d: 400},
              {a:  320, b:  480, c: 640, d: 400}
            ];
  
        var stackGen = d3.stack()
            // Defining keys
            .keys(["a", "b", "c", "d"])
  
        var stack = stackGen(data);
          
        console.log(stack);
  
        for (i = 0; i < 4; i++) {
  
            // Displaying keys
            console.log(stack[i].key);   
        }
    </script>
</body>
</html>

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Output:

full-stack-img




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