D3.js | d3.color() Function

The d3.color() function in D3.js is used to parse the specified CSS color used as parameter of the function and return RGB or HSL color. If specifier is not given, then null is returned.

Syntax:

d3.color(color);

Parameters: This function accepts single parameter color which specifies the CSS color.



Return Value: This function returns the RGB or HSL color value of the specified CSS color taken as the parameter of the function.

Below programs illustrate the d3.color() function in D3.js:

Example 1:

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<!DOCTYPE html>
<html>
  
<head>
    <title>d3.color() function</title>
  
    <script src='https://d3js.org/d3.v4.min.js'></script>
</head>
  
<body>
    <script>
          
        // Calling the d3.color() function fuction
        // with some parameters
        var color1 = d3.color("red");
        var color2 = d3.color("green");
        var color3 = d3.color("blue");
        
        // Getting the RGB or HSL values
        console.log(color1);
        console.log(color2);
        console.log(color3);
    </script>
</body>
  
</html>

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Output:

{"r":255, "g":0, "b":0, "opacity":1}
{"r":0, "g":128, "b":0, "opacity":1}
{"r":0, "g":0, "b":255, "opacity":1}

Example 2:

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<!DOCTYPE html>
<html>
  
<head>
    <title>d3.color() function</title>
  
    <script src='https://d3js.org/d3.v4.min.js'></script>
</head>
  
<body>
    <script>
          
        // Calling the d3.color() function fuction
        // without any parameters
        var color = d3.color();
        
        // Getting the RGB or HSL values
        console.log(color);
    </script>
</body>
  
</html>

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Output:

null

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



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