D3.js | color.opacity

Namachila October 31, 2025

0 0 1 minute read

The color.opacity in D3.js is used to fade the color. The opacity value is in the range of [0, 1].

Syntax:

color.opacity

Parameters: This function does not accept any parameters.

Return Value: This function returns the opacity value of the specified color.

Below program illustrate the color.opacity function in D3.js:

Example:

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>color.rgb() function</title> 
  
    <script src='https://d3js.org/d3.v4.min.js'> 
  </script> 
</head> 
  
<body> 
    <script> 
        // Calling the d3.color() function 
        // with some parameters 
        var color1 = d3.color("red"); 
        var color2 = d3.color("green"); 
        var color3 = d3.color("blue"); 
  
        // Calling the color.opacity 
        var A = color1.opacity; 
        var B = color2.opacity; 
        var C = color3.opacity; 
  
        // Getting the opacity value 
        console.log(A); 
        console.log(B); 
        console.log(C); 
    </script> 
</body> 
  
</html> 

Output:

1
1
1

Ref: https://devdocs.io/d3~5/d3-color#color_opacity

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