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D3.js | color.opacity

  • Last Updated : 12 Jul, 2019
Geek Week

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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