D3.js stackOffsetExpand() Method

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The D3.js stackOrderOffsetExpand() method applies a zero baseline and normalizes the values for each point such that the topline is always one.

Syntax:

d3.stackOrderOffsetExpand(series, order);

Parameters: This function accepts two parameters as mentioned above and described below.

series: This is the series based on which offset is expanded.
order: This is the ordering of the stack.

Return Value: This method returns no value.

Example:

HTML

<!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;"> 
        zambiatek 
    </h1> 
  
    <script> 
        var data = [ 
        {letter: {a: 1000, b: 2000, c: 3000, d: 4000}}, 
        {letter: {a: 2000, b: 3000, c: 4000, d: 5000}}, 
        {letter: {a: 640, b: 960, c: 640, d: 400}}, 
        {letter: {a: 320, b: 480, c: 640, d: 400}} 
        ]; 
        var stack = d3.stack() 
            .keys(["a", "b", "c", "d"]) 
            .value((d, key) => d.letter[key]) 
            .order(d3.stackOrderNone) 
  
            // Use of d3.stackOrderOffsetExpand() Method 
            .offset(d3.stackOffsetExpand); 
  
        var series = stack(data); 
        console.log(series); 
    </script> 
</body> 
</html> 

Output:

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